def simpleMeasure(geom, method=0, ellips=None, crs=None):
# Method defines calculation type:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
if geom.type() == QgsWkbTypes.PointGeometry:
if not geom.isMultipart():
pt = geom.geometry()
attr1 = pt.x()
attr2 = pt.y()
else:
pt = geom.asMultiPoint()
attr1 = pt[0].x()
attr2 = pt[0].y()
else:
measure = QgsDistanceArea()
if method == 2:
measure.setSourceCrs(crs)
measure.setEllipsoid(ellips)
measure.setEllipsoidalMode(True)
if geom.type() == QgsWkbTypes.PolygonGeometry:
attr1 = measure.measureArea(geom)
attr2 = measure.measurePerimeter(geom)
else:
attr1 = measure.measureLength(geom)
attr2 = None
return (attr1, attr2)
def processAlgorithm(self, parameters, context, feedback):
if parameters[self.INPUT] == parameters[self.HUBS]:
raise QgsProcessingException(
self.tr('Same layer given for both hubs and spokes'))
point_source = self.parameterAsSource(parameters, self.INPUT, context)
hub_source = self.parameterAsSource(parameters, self.HUBS, context)
fieldName = self.parameterAsString(parameters, self.FIELD, context)
units = self.UNITS[self.parameterAsEnum(parameters, self.UNIT, context)]
fields = point_source.fields()
fields.append(QgsField('HubName', QVariant.String))
fields.append(QgsField('HubDist', QVariant.Double))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point, point_source.sourceCrs())
index = QgsSpatialIndex(hub_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(point_source.sourceCrs(), context.transformContext())))
distance = QgsDistanceArea()
distance.setSourceCrs(point_source.sourceCrs(), context.transformContext())
distance.setEllipsoid(context.project().ellipsoid())
# Scan source points, find nearest hub, and write to output file
features = point_source.getFeatures()
total = 100.0 / point_source.featureCount() if point_source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
if not f.hasGeometry():
sink.addFeature(f, QgsFeatureSink.FastInsert)
continue
src = f.geometry().boundingBox().center()
neighbors = index.nearestNeighbor(src, 1)
ft = next(hub_source.getFeatures(QgsFeatureRequest().setFilterFid(neighbors[0]).setSubsetOfAttributes([fieldName], hub_source.fields()).setDestinationCrs(point_source.sourceCrs(), context.transformContext())))
closest = ft.geometry().boundingBox().center()
hubDist = distance.measureLine(src, closest)
if units != self.LAYER_UNITS:
hub_dist_in_desired_units = distance.convertLengthMeasurement(hubDist, units)
else:
hub_dist_in_desired_units = hubDist
attributes = f.attributes()
attributes.append(ft[fieldName])
attributes.append(hub_dist_in_desired_units)
feat = QgsFeature()
feat.setAttributes(attributes)
feat.setGeometry(QgsGeometry.fromPointXY(src))
sink.addFeature(feat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def prepareAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, 'INPUT', context)
mapping = self.parameterAsFieldsMapping(parameters, self.FIELDS_MAPPING, context)
self.fields = QgsFields()
self.expressions = []
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs())
da.setEllipsoid(context.project().ellipsoid())
# create an expression context using thread safe processing context
self.expr_context = self.createExpressionContext(parameters, context, source)
for field_def in mapping:
self.fields.append(QgsField(name=field_def['name'],
type=field_def['type'],
typeName="",
len=field_def.get('length', 0),
prec=field_def.get('precision', 0)))
expression = QgsExpression(field_def['expression'])
expression.setGeomCalculator(da)
expression.setDistanceUnits(context.project().distanceUnits())
expression.setAreaUnits(context.project().areaUnits())
if expression.hasParserError():
raise QgsProcessingException(
self.tr(u'Parser error in expression "{}": {}')
.format(str(expression.expression()),
str(expression.parserErrorString())))
self.expressions.append(expression)
return True
def simpleMeasure(geom, method=0, ellips=None, crs=None):
# Method defines calculation type:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
if geom.wkbType() in [QGis.WKBPoint, QGis.WKBPoint25D]:
pt = geom.asPoint()
attr1 = pt.x()
attr2 = pt.y()
elif geom.wkbType() in [QGis.WKBMultiPoint, QGis.WKBMultiPoint25D]:
pt = geom.asMultiPoint()
attr1 = pt[0].x()
attr2 = pt[0].y()
else:
measure = QgsDistanceArea()
if method == 2:
measure.setSourceCrs(crs)
measure.setEllipsoid(ellips)
measure.setEllipsoidalMode(True)
attr1 = measure.measure(geom)
if geom.type() == QGis.Polygon:
attr2 = measure.measurePerimeter(geom)
else:
attr2 = None
return (attr1, attr2)
def _calc_north(self):
extent = self.canvas.extent()
if self.canvas.layerCount() == 0 or extent.isEmpty():
print "No layers or extent"
return 0
outcrs = self.canvas.mapSettings().destinationCrs()
if outcrs.isValid() and not outcrs.geographicFlag():
crs = QgsCoordinateReferenceSystem()
crs.createFromOgcWmsCrs("EPSG:4326")
transform = QgsCoordinateTransform(outcrs, crs)
p1 = QgsPoint(extent.center())
p2 = QgsPoint(p1.x(), p1.y() + extent.height() * 0.25)
try:
pp1 = transform.transform(p1)
pp2 = transform.transform(p2)
except QgsCsException:
roam.utils.warning("North arrow. Error transforming.")
return None
area = QgsDistanceArea()
area.setEllipsoid(crs.ellipsoidAcronym())
area.setEllipsoidalMode(True)
area.setSourceCrs(crs)
distance, angle, _ = area.computeDistanceBearing(pp1, pp2)
angle = math.degrees(angle)
return angle
else:
return 0
def testRenderMetersInMapUnits(self):
crs_wsg84 = QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4326')
rt_extent = QgsRectangle(13.37768985634235, 52.51625705830762, 13.37771931686235, 52.51628651882762)
point_berlin_wsg84 = QgsPointXY(13.37770458660236, 52.51627178856762)
length_wsg84_mapunits = 0.00001473026350140572
meters_test = 2.40
da_wsg84 = QgsDistanceArea()
da_wsg84.setSourceCrs(crs_wsg84, QgsProject.instance().transformContext())
if (da_wsg84.sourceCrs().isGeographic()):
da_wsg84.setEllipsoid(da_wsg84.sourceCrs().ellipsoidAcronym())
length_meter_mapunits = da_wsg84.measureLineProjected(point_berlin_wsg84, 1.0, (math.pi / 2))
meters_test_mapunits = meters_test * length_wsg84_mapunits
meters_test_pixel = meters_test * length_wsg84_mapunits
ms = QgsMapSettings()
ms.setDestinationCrs(crs_wsg84)
ms.setExtent(rt_extent)
r = QgsRenderContext.fromMapSettings(ms)
r.setExtent(rt_extent)
self.assertEqual(r.extent().center().toString(7), point_berlin_wsg84.toString(7))
c = QgsMapUnitScale()
r.setDistanceArea(da_wsg84)
result_test_painterunits = r.convertToPainterUnits(meters_test, QgsUnitTypes.RenderMetersInMapUnits, c)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_painterunits, 7, QgsUnitTypes.DistanceUnknownUnit, True), QgsDistanceArea.formatDistance(meters_test_mapunits, 7, QgsUnitTypes.DistanceUnknownUnit, True))
result_test_mapunits = r.convertToMapUnits(meters_test, QgsUnitTypes.RenderMetersInMapUnits, c)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_mapunits, 7, QgsUnitTypes.DistanceDegrees, True), QgsDistanceArea.formatDistance(meters_test_mapunits, 7, QgsUnitTypes.DistanceDegrees, True))
result_test_meters = r.convertFromMapUnits(meters_test_mapunits, QgsUnitTypes.RenderMetersInMapUnits)
self.assertEqual(QgsDistanceArea.formatDistance(result_test_meters, 1, QgsUnitTypes.DistanceMeters, True), QgsDistanceArea.formatDistance(meters_test, 1, QgsUnitTypes.DistanceMeters, True))
def processAlgorithm(self, parameters, context, feedback):
layerPoints = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POINTS), context)
layerHubs = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.HUBS), context)
fieldName = self.getParameterValue(self.FIELD)
units = self.UNITS[self.getParameterValue(self.UNIT)]
if layerPoints.source() == layerHubs.source():
raise GeoAlgorithmExecutionException(
self.tr('Same layer given for both hubs and spokes'))
fields = layerPoints.fields()
fields.append(QgsField('HubName', QVariant.String))
fields.append(QgsField('HubDist', QVariant.Double))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.LineString, layerPoints.crs(),
context)
index = QgsProcessingUtils.createSpatialIndex(layerHubs, context)
distance = QgsDistanceArea()
distance.setSourceCrs(layerPoints.crs())
distance.setEllipsoid(QgsProject.instance().ellipsoid())
# Scan source points, find nearest hub, and write to output file
features = QgsProcessingUtils.getFeatures(layerPoints, context)
total = 100.0 / layerPoints.featureCount() if layerPoints.featureCount() else 0
for current, f in enumerate(features):
src = f.geometry().boundingBox().center()
neighbors = index.nearestNeighbor(src, 1)
ft = next(layerHubs.getFeatures(QgsFeatureRequest().setFilterFid(neighbors[0]).setSubsetOfAttributes([fieldName], layerHubs.fields())))
closest = ft.geometry().boundingBox().center()
hubDist = distance.measureLine(src, closest)
attributes = f.attributes()
attributes.append(ft[fieldName])
if units == 'Feet':
attributes.append(hubDist * 3.2808399)
elif units == 'Miles':
attributes.append(hubDist * 0.000621371192)
elif units == 'Kilometers':
attributes.append(hubDist / 1000.0)
elif units != 'Meters':
attributes.append(sqrt(
pow(src.x() - closest.x(), 2.0) +
pow(src.y() - closest.y(), 2.0)))
else:
attributes.append(hubDist)
feat = QgsFeature()
feat.setAttributes(attributes)
feat.setGeometry(QgsGeometry.fromPolyline([src, closest]))
writer.addFeature(feat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
del writer
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
field_name = self.parameterAsString(parameters, self.FIELD_NAME, context)
field_type = self.TYPES[self.parameterAsEnum(parameters, self.FIELD_TYPE, context)]
width = self.parameterAsInt(parameters, self.FIELD_LENGTH, context)
precision = self.parameterAsInt(parameters, self.FIELD_PRECISION, context)
new_field = self.parameterAsBool(parameters, self.NEW_FIELD, context)
formula = self.parameterAsString(parameters, self.FORMULA, context)
expression = QgsExpression(formula)
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs())
da.setEllipsoid(context.project().ellipsoid())
expression.setGeomCalculator(da)
expression.setDistanceUnits(context.project().distanceUnits())
expression.setAreaUnits(context.project().areaUnits())
fields = source.fields()
field_index = fields.lookupField(field_name)
if new_field or field_index < 0:
fields.append(QgsField(field_name, field_type, '', width, precision))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, source.wkbType(), source.sourceCrs())
exp_context = self.createExpressionContext(parameters, context)
if layer is not None:
exp_context.appendScope(QgsExpressionContextUtils.layerScope(layer))
if not expression.prepare(exp_context):
raise QgsProcessingException(
self.tr('Evaluation error: {0}').format(expression.parserErrorString()))
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
rownum = current + 1
exp_context.setFeature(f)
exp_context.lastScope().setVariable("row_number", rownum)
value = expression.evaluate(exp_context)
if expression.hasEvalError():
feedback.reportError(expression.evalErrorString())
else:
attrs = f.attributes()
if new_field or field_index < 0:
attrs.append(value)
else:
attrs[field_index] = value
f.setAttributes(attrs)
sink.addFeature(f, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def calculateDistance(self, p1, p2):
distance = QgsDistanceArea()
distance.setSourceCrs(self.iface.activeLayer().crs())
distance.setEllipsoidalMode(True)
# Sirgas 2000
distance.setEllipsoid('GRS1980')
m = distance.measureLine(p1, p2)
return m
def testWillUseEllipsoid(self):
"""test QgsDistanceArea::willUseEllipsoid """
da = QgsDistanceArea()
da.setEllipsoid("NONE")
self.assertFalse(da.willUseEllipsoid())
da.setEllipsoid("WGS84")
self.assertTrue(da.willUseEllipsoid())
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
output_file = self.parameterAsFileOutput(parameters, self.OUTPUT_HTML_FILE, context)
spatialIndex = QgsSpatialIndex(source, feedback)
distance = QgsDistanceArea()
distance.setSourceCrs(source.sourceCrs(), context.transformContext())
distance.setEllipsoid(context.project().ellipsoid())
sumDist = 0.00
A = source.sourceExtent()
A = float(A.width() * A.height())
features = source.getFeatures()
count = source.featureCount()
total = 100.0 / count if count else 1
for current, feat in enumerate(features):
if feedback.isCanceled():
break
neighbourID = spatialIndex.nearestNeighbor(
feat.geometry().asPoint(), 2)[1]
request = QgsFeatureRequest().setFilterFid(neighbourID).setSubsetOfAttributes([])
neighbour = next(source.getFeatures(request))
sumDist += distance.measureLine(neighbour.geometry().asPoint(),
feat.geometry().asPoint())
feedback.setProgress(int(current * total))
do = float(sumDist) / count
de = float(0.5 / math.sqrt(count / A))
d = float(do / de)
SE = float(0.26136 / math.sqrt(count ** 2 / A))
zscore = float((do - de) / SE)
results = {}
results[self.OBSERVED_MD] = do
results[self.EXPECTED_MD] = de
results[self.NN_INDEX] = d
results[self.POINT_COUNT] = count
results[self.Z_SCORE] = zscore
if output_file:
data = []
data.append('Observed mean distance: ' + str(do))
data.append('Expected mean distance: ' + str(de))
data.append('Nearest neighbour index: ' + str(d))
data.append('Number of points: ' + str(count))
data.append('Z-Score: ' + str(zscore))
self.createHTML(output_file, data)
results[self.OUTPUT_HTML_FILE] = output_file
return results
def get_distance_area(self, layer):
destination = layer.crs()
distance_area = QgsDistanceArea()
distance_area.setSourceCrs(layer.crs())
distance_area.setEllipsoid(destination.ellipsoidAcronym())
# sets whether coordinates must be projected to ellipsoid before measuring
distance_area.setEllipsoidalMode(True)
return distance_area
def getSemiMajorAndSemiMinorAxis(self):
"""Obtains the semi major axis and semi minor axis from the used ellipsoid
"""
currentLayer = self.iface.mapCanvas().currentLayer()
distanceArea = QgsDistanceArea()
distanceArea.setEllipsoid(currentLayer.crs().ellipsoidAcronym())
a = distanceArea.ellipsoidSemiMajor()
b = distanceArea.ellipsoidSemiMinor()
return (a,b)
def testLengthMeasureAndUnits(self):
"""Test a variety of length measurements in different CRS and ellipsoid modes, to check that the
calculated lengths and units are always consistent
"""
da = QgsDistanceArea()
da.setSourceCrs(3452)
da.setEllipsoidalMode(False)
da.setEllipsoid("NONE")
daCRS = QgsCoordinateReferenceSystem()
daCRS.createFromSrsId(da.sourceCrs())
# We check both the measured length AND the units, in case the logic regarding
# ellipsoids and units changes in future
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print "measured {} in {}".format(distance, QgsUnitTypes.toString(units))
assert ((abs(distance - 2.23606797) < 0.00000001 and units == QGis.Degrees) or
(abs(distance - 248.52) < 0.01 and units == QGis.Meters))
da.setEllipsoid("WGS84")
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print "measured {} in {}".format(distance, QgsUnitTypes.toString(units))
assert ((abs(distance - 2.23606797) < 0.00000001 and units == QGis.Degrees) or
(abs(distance - 248.52) < 0.01 and units == QGis.Meters))
da.setEllipsoidalMode(True)
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print "measured {} in {}".format(distance, QgsUnitTypes.toString(units))
# should always be in Meters
self.assertAlmostEqual(distance, 247555.57, delta=0.01)
self.assertEqual(units, QGis.Meters)
# now try with a source CRS which is in feet
da.setSourceCrs(27469)
da.setEllipsoidalMode(False)
# measurement should be in feet
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print "measured {} in {}".format(distance, QgsUnitTypes.toString(units))
self.assertAlmostEqual(distance, 2.23606797, delta=0.000001)
self.assertEqual(units, QGis.Feet)
da.setEllipsoidalMode(True)
# now should be in Meters again
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print "measured {} in {}".format(distance, QgsUnitTypes.toString(units))
self.assertAlmostEqual(distance, 0.67953772, delta=0.000001)
self.assertEqual(units, QGis.Meters)
def regularMatrix(self, parameters, context, source, inField, target_source, targetField,
nPoints, feedback):
distArea = QgsDistanceArea()
distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
distArea.setEllipsoid(context.project().ellipsoid())
inIdx = source.fields().lookupField(inField)
targetIdx = target_source.fields().lookupField(targetField)
index = QgsSpatialIndex(target_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(source.sourceCrs(), context.transformContext())), feedback)
first = True
sink = None
dest_id = None
features = source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([inIdx]))
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
inGeom = inFeat.geometry()
if first:
featList = index.nearestNeighbor(inGeom.asPoint(), nPoints)
first = False
fields = QgsFields()
input_id_field = source.fields()[inIdx]
input_id_field.setName('ID')
fields.append(input_id_field)
for f in target_source.getFeatures(QgsFeatureRequest().setFilterFids(featList).setSubsetOfAttributes([targetIdx]).setDestinationCrs(source.sourceCrs(), context.transformContext())):
fields.append(QgsField(str(f[targetField]), QVariant.Double))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, source.wkbType(), source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
data = [inFeat[inField]]
for target in target_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setFilterFids(featList).setDestinationCrs(source.sourceCrs(), context.transformContext())):
if feedback.isCanceled():
break
outGeom = target.geometry()
dist = distArea.measureLine(inGeom.asPoint(),
outGeom.asPoint())
data.append(dist)
out_feature = QgsFeature()
out_feature.setGeometry(inGeom)
out_feature.setAttributes(data)
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def calculate( self, layer, fieldName, expression ):
if ( layer.featureCount() == 0 ):
self.msg.show( "[Info] * No existing features on layer " + layer.name() + " to calculate expression.", 'info', True )
return
expression = QgsExpression( expression )
if expression.hasParserError():
self.msg.show( QApplication.translate( "AutoFields-FieldCalculator", "[Error] (Parsing) " ) + \
expression.parserErrorString(), 'critical' )
return
context = QgsExpressionContext()
context.appendScope( QgsExpressionContextUtils.globalScope() )
context.appendScope( QgsExpressionContextUtils.projectScope() )
context.appendScope( QgsExpressionContextUtils.layerScope( layer ) )
context.setFields( layer.fields() )
if expression.needsGeometry():
if self.iface:
# This block was borrowed from QGIS/python/plugins/processing/algs/qgis/FieldsCalculator.py
da = QgsDistanceArea()
da.setSourceCrs( layer.crs().srsid() )
da.setEllipsoidalMode( self.iface.mapCanvas().mapSettings().hasCrsTransformEnabled() )
da.setEllipsoid( QgsProject.instance().readEntry( 'Measure', '/Ellipsoid', GEO_NONE )[0] )
expression.setGeomCalculator( da )
if QGis.QGIS_VERSION_INT >= 21400: # Methods added in QGIS 2.14
expression.setDistanceUnits( QgsProject.instance().distanceUnits() )
expression.setAreaUnits( QgsProject.instance().areaUnits() )
expression.prepare( context )
fieldIndex = layer.fieldNameIndex( fieldName )
if fieldIndex == -1:
return
field = layer.fields()[fieldIndex]
dictResults = {}
for feature in layer.getFeatures():
context.setFeature( feature )
result = expression.evaluate( context )
if expression.hasEvalError():
self.msg.show( QApplication.translate( "AutoFields-FieldCalculator", "[Error] (Evaluating) " ) + \
expression.evalErrorString(), 'critical' )
return
dictResults[feature.id()] = { fieldIndex: field.convertCompatible( result ) }
layer.dataProvider().changeAttributeValues( dictResults )
self.msg.show( "[Info] * An expression was calculated on existing features of layer " + layer.name() + ", field " + fieldName + ".", 'info', True )
def testLengthMeasureAndUnits(self):
"""Test a variety of length measurements in different CRS and ellipsoid modes, to check that the
calculated lengths and units are always consistent
"""
da = QgsDistanceArea()
da.setSourceCrs(QgsCoordinateReferenceSystem.fromSrsId(3452), QgsProject.instance().transformContext())
da.setEllipsoid("NONE")
# We check both the measured length AND the units, in case the logic regarding
# ellipsoids and units changes in future
distance = da.measureLine(QgsPointXY(1, 1), QgsPointXY(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance, QgsUnitTypes.toString(units))))
assert ((abs(distance - 2.23606797) < 0.00000001 and units == QgsUnitTypes.DistanceDegrees) or
(abs(distance - 248.52) < 0.01 and units == QgsUnitTypes.DistanceMeters))
da.setEllipsoid("WGS84")
distance = da.measureLine(QgsPointXY(1, 1), QgsPointXY(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance, QgsUnitTypes.toString(units))))
# should always be in Meters
self.assertAlmostEqual(distance, 247555.57, delta=0.01)
self.assertEqual(units, QgsUnitTypes.DistanceMeters)
# test converting the resultant length
distance = da.convertLengthMeasurement(distance, QgsUnitTypes.DistanceNauticalMiles)
self.assertAlmostEqual(distance, 133.669, delta=0.01)
# now try with a source CRS which is in feet
da.setSourceCrs(QgsCoordinateReferenceSystem.fromSrsId(27469), QgsProject.instance().transformContext())
da.setEllipsoid("NONE")
# measurement should be in feet
distance = da.measureLine(QgsPointXY(1, 1), QgsPointXY(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(distance, 2.23606797, delta=0.000001)
self.assertEqual(units, QgsUnitTypes.DistanceFeet)
# test converting the resultant length
distance = da.convertLengthMeasurement(distance, QgsUnitTypes.DistanceMeters)
self.assertAlmostEqual(distance, 0.6815, delta=0.001)
da.setEllipsoid("WGS84")
# now should be in Meters again
distance = da.measureLine(QgsPointXY(1, 1), QgsPointXY(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(distance, 0.67953772, delta=0.000001)
self.assertEqual(units, QgsUnitTypes.DistanceMeters)
# test converting the resultant length
distance = da.convertLengthMeasurement(distance, QgsUnitTypes.DistanceFeet)
self.assertAlmostEqual(distance, 2.2294, delta=0.001)
def prepareAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
group_by = self.parameterAsExpression(parameters, self.GROUP_BY, context)
aggregates = self.parameterAsAggregates(parameters, self.AGGREGATES, context)
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
self.source = source
self.group_by = group_by
self.group_by_expr = self.createExpression(group_by, da, context)
self.geometry_expr = self.createExpression('collect($geometry, {})'.format(group_by), da, context)
self.fields = QgsFields()
self.fields_expr = []
for field_def in aggregates:
self.fields.append(QgsField(name=field_def['name'],
type=field_def['type'],
typeName="",
len=field_def['length'],
prec=field_def['precision']))
aggregate = field_def['aggregate']
if aggregate == 'first_value':
expression = field_def['input']
elif aggregate == 'concatenate':
expression = ('{}({}, {}, {}, \'{}\')'
.format(field_def['aggregate'],
field_def['input'],
group_by,
'TRUE',
field_def['delimiter']))
else:
expression = '{}({}, {})'.format(field_def['aggregate'],
field_def['input'],
group_by)
expr = self.createExpression(expression, da, context)
self.fields_expr.append(expr)
return True
def impact_table(self):
"""Return data as dictionary"""
# prepare area calculator object
area_calc = QgsDistanceArea()
area_calc.setSourceCrs(self.impact_layer.crs())
area_calc.setEllipsoid('WGS84')
area_calc.setEllipsoidalMode(True)
impacted_table = FlatTable('landcover', 'hazard', 'zone')
for f in self.impact_layer.getFeatures():
area = area_calc.measure(f.geometry()) / 1e4
zone = f[self.zone_field] if self.zone_field is not None else None
impacted_table.add_value(
area,
landcover=f[self.land_cover_field],
hazard=f[self.target_field],
zone=zone)
return impacted_table.to_dict()
def evaluation(self=None, parameters={},feature=None):
from PyQt4.QtCore import QVariant
from qgis.core import QgsDistanceArea, QgsCoordinateReferenceSystem
ar = NULL
per = NULL
id = NULL
flr = NULL
usage = NULL
kind = NULL
da_engine=QgsDistanceArea()
da_engine.setSourceCrs(QgsCoordinateReferenceSystem(int(config.project_crs.split(':')[-1]), QgsCoordinateReferenceSystem.EpsgCrsId))
da_engine.setEllipsoid(config.project_ellipsoid)
da_engine.setEllipsoidalMode(True)
if feature:
geometry = feature.geometry()
#print geometry
ar = da_engine.measureArea(geometry)
per =da_engine.measurePerimeter(geometry)
id = feature[config.building_id_key] #necessary to safe dependency check
flr = feature[u'FLRS_ALK'] # necessary to safe dependency check
usage = feature[u'FUNC_ALK'] # necessary to safe dependency check
kind = feature[u'KIND_ALK'] # necessary to safe dependency check
#print ar
#print per
#print id
return {config.building_id_key: {'type': QVariant.String,
'value': id},
'AREA_ALK': {'type': QVariant.Double,
'value': ar},
'PERI_ALK': {'type': QVariant.Double,
'value': per},
'FLRS_ALK': {'type': QVariant.Double,
'value': flr},
'FUNC_ALK': {'type': QVariant.Double,
'value': usage},
'KIND_ALK': {'type': QVariant.Double,
'value': kind},
}
def _newDialog(self, cloneFeature):
feature = QgsFeature()
if (cloneFeature):
feature = QgsFeature(self._feature)
else:
feature = self._feature
context = QgsAttributeEditorContext()
myDa = QgsDistanceArea()
myDa.setSourceCrs(self._layer.crs())
myDa.setEllipsoidalMode(self._iface.mapCanvas().mapSettings().hasCrsTransformEnabled())
myDa.setEllipsoid(QgsProject.instance().readEntry('Measure', '/Ellipsoid', GEO_NONE)[0])
context.setDistanceArea(myDa)
context.setVectorLayerTools(self._iface.vectorLayerTools())
dialog = QgsAttributeDialog(self._layer, feature, cloneFeature, None, True, context)
if (self._layer.actions().size() > 0):
dialog.setContextMenuPolicy(Qt.ActionsContextMenu)
a = QAction(self.tr('Run actions'), dialog)
a.setEnabled(False)
dialog.addAction(a)
i = 0
for action in self._layer.actions():
if (action.runable()):
a = FeatureAction(action.name(), feature, self._layer, i, -1, self._iface, dialog)
dialog.addAction(a)
a.triggered.connect(a.execute)
pb = dialog.findChild(action.name())
if (pb):
pb.clicked.connect(a.execute)
i += 1
return dialog
def simpleMeasure( self, inGeom, calcType, ellips, crs ):
if inGeom.wkbType() in ( QGis.WKBPoint, QGis.WKBPoint25D ):
pt = inGeom.asPoint()
attr1 = pt.x()
attr2 = pt.y()
elif inGeom.wkbType() in ( QGis.WKBMultiPoint, QGis.WKBMultiPoint25D ):
pt = inGeom.asMultiPoint()
attr1 = pt[ 0 ].x()
attr2 = pt[ 0 ].y()
else:
measure = QgsDistanceArea()
if calcType == 2:
measure.setSourceCrs( crs )
measure.setEllipsoid( ellips )
measure.setEllipsoidalMode( True )
attr1 = measure.measure( inGeom )
if inGeom.type() == QGis.Polygon:
attr2 = self.perimMeasure( inGeom, measure )
else:
attr2 = attr1
return ( attr1, attr2 )
def setCustomExpression( self ):
""" Initialize and show the expression builder dialog """
layer = None
if len( self.tblLayers.selectedItems() ) / 3 == 1: # Single layer selected?
for item in self.tblLayers.selectedItems():
if item.column() == 1: # It's the layer name item
layer = QgsMapLayerRegistry.instance().mapLayer( item.data( Qt.UserRole ) )
if not self.expressionDlg:
self.expressionDlg = ExpressionBuilderDialog( self.iface.mainWindow() )
context = QgsExpressionContext()
context.appendScope( QgsExpressionContextUtils.globalScope() )
context.appendScope( QgsExpressionContextUtils.projectScope() )
# Initialize dialog with layer-based names and variables if single layer selected
if len( self.tblLayers.selectedItems() ) / 3 == 1:
context.appendScope( QgsExpressionContextUtils.layerScope( layer ) )
self.expressionDlg.expressionBuilderWidget.setLayer( layer )
self.expressionDlg.expressionBuilderWidget.loadFieldNames()
# This block was borrowed from QGIS/python/plugins/processing/algs/qgis/FieldsCalculator.py
da = QgsDistanceArea()
da.setSourceCrs( layer.crs().srsid() )
da.setEllipsoidalMode( self.iface.mapCanvas().mapSettings().hasCrsTransformEnabled() )
da.setEllipsoid( QgsProject.instance().readEntry( 'Measure', '/Ellipsoid', GEO_NONE )[0] )
self.expressionDlg.expressionBuilderWidget.setGeomCalculator( da )
# If this layer-field is an AutoField, get its expression
if self.optExistingField.isChecked():
fieldName = self.cboField.currentText()
expression = self.autoFieldManager.getFieldExpression( layer, fieldName )
self.expressionDlg.expressionBuilderWidget.setExpressionText( expression )
self.expressionDlg.expression = expression # To remember it when closing/opening
self.expressionDlg.expressionBuilderWidget.setExpressionContext( context )
self.expressionDlg.show()
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
group_field_name = self.parameterAsString(parameters, self.GROUP_FIELD, context)
order_field_name = self.parameterAsString(parameters, self.ORDER_FIELD, context)
date_format = self.parameterAsString(parameters, self.DATE_FORMAT, context)
text_dir = self.parameterAsString(parameters, self.OUTPUT_TEXT_DIR, context)
group_field_index = source.fields().lookupField(group_field_name)
order_field_index = source.fields().lookupField(order_field_name)
if group_field_index >= 0:
group_field_def = source.fields().at(group_field_index)
else:
group_field_def = None
order_field_def = source.fields().at(order_field_index)
fields = QgsFields()
if group_field_def is not None:
fields.append(group_field_def)
begin_field = QgsField(order_field_def)
begin_field.setName('begin')
fields.append(begin_field)
end_field = QgsField(order_field_def)
end_field.setName('end')
fields.append(end_field)
output_wkb = QgsWkbTypes.LineString
if QgsWkbTypes.hasM(source.wkbType()):
output_wkb = QgsWkbTypes.addM(output_wkb)
if QgsWkbTypes.hasZ(source.wkbType()):
output_wkb = QgsWkbTypes.addZ(output_wkb)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, output_wkb, source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
points = dict()
features = source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([group_field_index, order_field_index]), QgsProcessingFeatureSource.FlagSkipGeometryValidityChecks)
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
if not f.hasGeometry():
continue
point = f.geometry().constGet().clone()
if group_field_index >= 0:
group = f.attributes()[group_field_index]
else:
group = 1
order = f.attributes()[order_field_index]
if date_format != '':
order = datetime.strptime(str(order), date_format)
if group in points:
points[group].append((order, point))
else:
points[group] = [(order, point)]
feedback.setProgress(int(current * total))
feedback.setProgress(0)
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
current = 0
total = 100.0 / len(points) if points else 1
for group, vertices in list(points.items()):
if feedback.isCanceled():
break
vertices.sort(key=lambda x: (x[0] is None, x[0]))
f = QgsFeature()
attributes = []
if group_field_index >= 0:
attributes.append(group)
attributes.extend([vertices[0][0], vertices[-1][0]])
f.setAttributes(attributes)
line = [node[1] for node in vertices]
if text_dir:
fileName = os.path.join(text_dir, '%s.txt' % group)
with open(fileName, 'w') as fl:
fl.write('angle=Azimuth\n')
fl.write('heading=Coordinate_System\n')
fl.write('dist_units=Default\n')
for i in range(len(line)):
if i == 0:
fl.write('startAt=%f;%f;90\n' % (line[i].x(), line[i].y()))
fl.write('survey=Polygonal\n')
fl.write('[data]\n')
else:
angle = line[i - 1].azimuth(line[i])
distance = da.measureLine(QgsPointXY(line[i - 1]), QgsPointXY(line[i]))
fl.write('%f;%f;90\n' % (angle, distance))
f.setGeometry(QgsGeometry(QgsLineString(line)))
sink.addFeature(f, QgsFeatureSink.FastInsert)
current += 1
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
strategy = self.parameterAsEnum(parameters, self.STRATEGY, context)
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE, context)
expression = QgsExpression(self.parameterAsString(parameters, self.EXPRESSION, context))
if expression.hasParserError():
raise QgsProcessingException(expression.parserErrorString())
expressionContext = self.createExpressionContext(parameters, context, source)
expression.prepare(expressionContext)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point, source.sourceCrs(), QgsFeatureSink.RegeneratePrimaryKey)
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
total = 100.0 / source.featureCount() if source.featureCount() else 0
current_progress = 0
for current, f in enumerate(source.getFeatures()):
if feedback.isCanceled():
break
if not f.hasGeometry():
continue
current_progress = total * current
feedback.setProgress(current_progress)
expressionContext.setFeature(f)
value = expression.evaluate(expressionContext)
if expression.hasEvalError():
feedback.pushInfo(
self.tr('Evaluation error for feature ID {}: {}').format(f.id(), expression.evalErrorString()))
continue
fGeom = f.geometry()
engine = QgsGeometry.createGeometryEngine(fGeom.constGet())
engine.prepareGeometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(value)
else:
pointCount = int(round(value * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo("Skip feature {} as number of points for it is 0.".format(f.id()))
continue
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
feature_total = total / pointCount if pointCount else 1
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
if feedback.isCanceled():
break
rx = bbox.xMinimum() + bbox.width() * random.random()
ry = bbox.yMinimum() + bbox.height() * random.random()
p = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPointXY(p)
if engine.contains(geom.constGet()) and \
vector.checkMinDistance(p, index, minDistance, points):
f = QgsFeature(nPoints)
f.initAttributes(1)
f.setFields(fields)
f.setAttribute('id', nPoints)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
index.addFeature(f)
points[nPoints] = p
nPoints += 1
feedback.setProgress(current_progress + int(nPoints * feature_total))
nIterations += 1
if nPoints < pointCount:
feedback.pushInfo(self.tr('Could not generate requested number of random '
'points. Maximum number of attempts exceeded.'))
feedback.setProgress(100)
return {self.OUTPUT: dest_id}
def linearMatrix(self, parameters, context, source, inField, target_source, targetField, same_source_and_target,
matType, nPoints, feedback):
if same_source_and_target:
# need to fetch an extra point from the index, since the closest match will always be the same
# as the input feature
nPoints += 1
inIdx = source.fields().lookupField(inField)
outIdx = target_source.fields().lookupField(targetField)
fields = QgsFields()
input_id_field = source.fields()[inIdx]
input_id_field.setName('InputID')
fields.append(input_id_field)
if matType == 0:
target_id_field = target_source.fields()[outIdx]
target_id_field.setName('TargetID')
fields.append(target_id_field)
fields.append(QgsField('Distance', QVariant.Double))
else:
fields.append(QgsField('MEAN', QVariant.Double))
fields.append(QgsField('STDDEV', QVariant.Double))
fields.append(QgsField('MIN', QVariant.Double))
fields.append(QgsField('MAX', QVariant.Double))
out_wkb = QgsWkbTypes.multiType(source.wkbType()) if matType == 0 else source.wkbType()
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, out_wkb, source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
index = QgsSpatialIndex(target_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(source.sourceCrs(), context.transformContext())), feedback)
distArea = QgsDistanceArea()
distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
distArea.setEllipsoid(context.project().ellipsoid())
features = source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([inIdx]))
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
inGeom = inFeat.geometry()
inID = str(inFeat.attributes()[inIdx])
featList = index.nearestNeighbor(inGeom.asPoint(), nPoints)
distList = []
vari = 0.0
request = QgsFeatureRequest().setFilterFids(featList).setSubsetOfAttributes([outIdx]).setDestinationCrs(source.sourceCrs(), context.transformContext())
for outFeat in target_source.getFeatures(request):
if feedback.isCanceled():
break
if same_source_and_target and inFeat.id() == outFeat.id():
continue
outID = outFeat.attributes()[outIdx]
outGeom = outFeat.geometry()
dist = distArea.measureLine(inGeom.asPoint(),
outGeom.asPoint())
if matType == 0:
out_feature = QgsFeature()
out_geom = QgsGeometry.unaryUnion([inFeat.geometry(), outFeat.geometry()])
out_feature.setGeometry(out_geom)
out_feature.setAttributes([inID, outID, dist])
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
else:
distList.append(float(dist))
if matType != 0:
mean = sum(distList) / len(distList)
for i in distList:
vari += (i - mean) * (i - mean)
vari = math.sqrt(vari / len(distList))
out_feature = QgsFeature()
out_feature.setGeometry(inFeat.geometry())
out_feature.setAttributes([inID, mean, vari, min(distList), max(distList)])
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
class ExportGeometryInfo(QgisAlgorithm):
INPUT = 'INPUT'
METHOD = 'CALC_METHOD'
OUTPUT = 'OUTPUT'
def icon(self):
return QgsApplication.getThemeIcon("/algorithms/mAlgorithmAddGeometryAttributes.svg")
def svgIconPath(self):
return QgsApplication.iconPath("/algorithms/mAlgorithmAddGeometryAttributes.svg")
def tags(self):
return self.tr('export,add,information,measurements,areas,lengths,perimeters,latitudes,longitudes,x,y,z,extract,points,lines,polygons,sinuosity,fields').split(',')
def group(self):
return self.tr('Vector geometry')
def groupId(self):
return 'vectorgeometry'
def __init__(self):
super().__init__()
self.export_z = False
self.export_m = False
self.distance_area = None
self.calc_methods = [self.tr('Layer CRS'),
self.tr('Project CRS'),
self.tr('Ellipsoidal')]
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
self.tr('Input layer')))
self.addParameter(QgsProcessingParameterEnum(self.METHOD,
self.tr('Calculate using'), options=self.calc_methods, defaultValue=0))
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Added geom info')))
def name(self):
return 'exportaddgeometrycolumns'
def displayName(self):
return self.tr('Add geometry attributes')
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
method = self.parameterAsEnum(parameters, self.METHOD, context)
wkb_type = source.wkbType()
fields = source.fields()
new_fields = QgsFields()
if QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.PolygonGeometry:
new_fields.append(QgsField('area', QVariant.Double))
new_fields.append(QgsField('perimeter', QVariant.Double))
elif QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.LineGeometry:
new_fields.append(QgsField('length', QVariant.Double))
if not QgsWkbTypes.isMultiType(source.wkbType()):
new_fields.append(QgsField('straightdis', QVariant.Double))
new_fields.append(QgsField('sinuosity', QVariant.Double))
else:
new_fields.append(QgsField('xcoord', QVariant.Double))
new_fields.append(QgsField('ycoord', QVariant.Double))
if QgsWkbTypes.hasZ(source.wkbType()):
self.export_z = True
new_fields.append(QgsField('zcoord', QVariant.Double))
if QgsWkbTypes.hasM(source.wkbType()):
self.export_m = True
new_fields.append(QgsField('mvalue', QVariant.Double))
fields = QgsProcessingUtils.combineFields(fields, new_fields)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, wkb_type, source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
coordTransform = None
# Calculate with:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
self.distance_area = QgsDistanceArea()
if method == 2:
self.distance_area.setSourceCrs(source.sourceCrs(), context.transformContext())
self.distance_area.setEllipsoid(context.project().ellipsoid())
elif method == 1:
coordTransform = QgsCoordinateTransform(source.sourceCrs(), context.project().crs(), context.project())
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
outFeat = f
attrs = f.attributes()
inGeom = f.geometry()
if inGeom:
if coordTransform is not None:
inGeom.transform(coordTransform)
if inGeom.type() == QgsWkbTypes.PointGeometry:
attrs.extend(self.point_attributes(inGeom))
elif inGeom.type() == QgsWkbTypes.PolygonGeometry:
attrs.extend(self.polygon_attributes(inGeom))
else:
attrs.extend(self.line_attributes(inGeom))
# ensure consistent count of attributes - otherwise null
# geometry features will have incorrect attribute length
# and provider may reject them
if len(attrs) < len(fields):
attrs += [NULL] * (len(fields) - len(attrs))
outFeat.setAttributes(attrs)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def point_attributes(self, geometry):
pt = None
if not geometry.isMultipart():
pt = geometry.constGet()
else:
if geometry.numGeometries() > 0:
pt = geometry.geometryN(0)
attrs = []
if pt:
attrs.append(pt.x())
attrs.append(pt.y())
# add point z/m
if self.export_z:
attrs.append(pt.z())
if self.export_m:
attrs.append(pt.m())
return attrs
def line_attributes(self, geometry):
if geometry.isMultipart():
return [self.distance_area.measureLength(geometry)]
else:
curve = geometry.constGet()
p1 = curve.startPoint()
p2 = curve.endPoint()
straight_distance = self.distance_area.measureLine(QgsPointXY(p1), QgsPointXY(p2))
sinuosity = curve.sinuosity()
if math.isnan(sinuosity):
sinuosity = NULL
return [self.distance_area.measureLength(geometry), straight_distance, sinuosity]
def polygon_attributes(self, geometry):
area = self.distance_area.measureArea(geometry)
perimeter = self.distance_area.measurePerimeter(geometry)
return [area, perimeter]
def testMeasureLineProjectedWorldPoints(self):
# +-+
# | |
# +-+ +
# checking returned length_mapunits/projected_points of diffferent world points with results from SpatiaLite ST_Project
da_3068 = QgsDistanceArea()
da_3068.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:3068'), QgsProject.instance().transformContext())
if (da_3068.sourceCrs().isGeographic()):
da_3068.setEllipsoid(da_3068.sourceCrs().ellipsoidAcronym())
self.assertEqual(da_3068.sourceCrs().authid(), 'EPSG:3068')
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}]".format(u'EPSG:3068', da_3068.sourceCrs().authid(), da_3068.sourceCrs().description(), da_3068.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_3068.lengthUnits()), da_3068.sourceCrs().projectionAcronym(), da_3068.sourceCrs().ellipsoidAcronym())))
da_wsg84 = QgsDistanceArea()
da_wsg84.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4326'), QgsProject.instance().transformContext())
if (da_wsg84.sourceCrs().isGeographic()):
da_wsg84.setEllipsoid(da_wsg84.sourceCrs().ellipsoidAcronym())
self.assertEqual(da_wsg84.sourceCrs().authid(), 'EPSG:4326')
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}] ellipsoid[{}]".format(u'EPSG:4326', da_wsg84.sourceCrs().authid(), da_wsg84.sourceCrs().description(), da_wsg84.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_wsg84.lengthUnits()), da_wsg84.sourceCrs().projectionAcronym(), da_wsg84.sourceCrs().ellipsoidAcronym(), da_wsg84.ellipsoid())))
da_4314 = QgsDistanceArea()
da_4314.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4314'), QgsProject.instance().transformContext())
if (da_4314.sourceCrs().isGeographic()):
da_4314.setEllipsoid(da_4314.sourceCrs().ellipsoidAcronym())
self.assertEqual(da_4314.sourceCrs().authid(), 'EPSG:4314')
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}]".format(u'EPSG:4314', da_4314.sourceCrs().authid(), da_4314.sourceCrs().description(), da_4314.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_4314.lengthUnits()), da_4314.sourceCrs().projectionAcronym(), da_4314.sourceCrs().ellipsoidAcronym())))
da_4805 = QgsDistanceArea()
da_4805.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4805'), QgsProject.instance().transformContext())
if (da_4805.sourceCrs().isGeographic()):
da_4805.setEllipsoid(da_4805.sourceCrs().ellipsoidAcronym())
self.assertEqual(da_4805.sourceCrs().authid(), 'EPSG:4805')
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}]".format(u'EPSG:4805', da_4805.sourceCrs().authid(), da_4805.sourceCrs().description(), da_4805.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_4805.lengthUnits()), da_4805.sourceCrs().projectionAcronym(), da_4805.sourceCrs().ellipsoidAcronym())))
# EPSG:5665 unknown, why?
da_5665 = QgsDistanceArea()
da_5665.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:5665'), QgsProject.instance().transformContext())
if (da_5665.sourceCrs().isGeographic()):
da_5665.setEllipsoid(da_5665.sourceCrs().ellipsoidAcronym())
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}]".format(u'EPSG:5665', da_5665.sourceCrs().authid(), da_5665.sourceCrs().description(), da_5665.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_5665.lengthUnits()), da_5665.sourceCrs().projectionAcronym(), da_5665.sourceCrs().ellipsoidAcronym())))
#self.assertEqual(da_5665.sourceCrs().authid(), 'EPSG:5665')
da_25833 = QgsDistanceArea()
da_25833.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:25833'), QgsProject.instance().transformContext())
if (da_25833.sourceCrs().isGeographic()):
da_25833.setEllipsoid(da_25833.sourceCrs().ellipsoidAcronym())
print(("setting [{}] srid [{}] description [{}] isGeographic[{}] lengthUnits[{}] projectionAcronym[{}] ellipsoidAcronym[{}]".format(u'EPSG:25833', da_25833.sourceCrs().authid(), da_25833.sourceCrs().description(), da_25833.sourceCrs().isGeographic(), QgsUnitTypes.toString(da_25833.lengthUnits()), da_25833.sourceCrs().projectionAcronym(), da_25833.sourceCrs().ellipsoidAcronym())))
self.assertEqual(da_25833.sourceCrs().authid(), 'EPSG:25833')
# Berlin - Brandenburg Gate - Quadriga
point_berlin_3068 = QgsPointXY(23183.38449999984, 21047.3225000017)
point_berlin_3068_project = point_berlin_3068.project(1, (math.pi / 2))
point_meter_result = QgsPointXY(0, 0)
length_meter_mapunits, point_meter_result = da_3068.measureLineProjected(point_berlin_3068, 1.0, (math.pi / 2))
pprint(point_meter_result)
print('-I-> Berlin 3068 length_meter_mapunits[{}] point_meter_result[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_3068.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 1, da_3068.lengthUnits(), True), '1.0 m')
self.assertEqual(point_meter_result.toString(7), point_berlin_3068_project.toString(7))
point_berlin_wsg84 = QgsPointXY(13.37770458660236, 52.51627178856762)
point_berlin_wsg84_project = QgsPointXY(13.37771931736259, 52.51627178856669)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_berlin_wsg84, 1.0, (math.pi / 2))
print('-I-> Berlin Wsg84 length_meter_mapunits[{}] point_meter_result[{}] ellipsoid[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 20, da_wsg84.lengthUnits(), True), point_meter_result.asWkt(), da_wsg84.ellipsoid()))
# for unknown reasons, this is returning '0.00001473026 m' instead of '0.00001473026 deg' when using da_wsg84.lengthUnits()
# self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits,11,da_wsg84.lengthUnits(),True), '0.00001473026 deg')
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 11, QgsUnitTypes.DistanceDegrees, True), '0.00001473026 deg')
self.assertEqual(point_meter_result.toString(7), point_berlin_wsg84_project.toString(7))
point_berlin_4314 = QgsPointXY(13.37944343021465, 52.51767872437083)
point_berlin_4314_project = QgsPointXY(13.37945816324759, 52.5176787243699)
length_meter_mapunits, point_meter_result = da_4314.measureLineProjected(point_berlin_4314, 1.0, (math.pi / 2))
print('-I-> Berlin 4314 length_meter_mapunits[{}] point_meter_result[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_4314.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 9, QgsUnitTypes.DistanceDegrees, True), '0.000014733 deg')
self.assertEqual(point_meter_result.toString(7), point_berlin_4314_project.toString(7))
point_berlin_4805 = QgsPointXY(31.04960570069176, 52.5174657497405)
point_berlin_4805_project = QgsPointXY(31.04962043365347, 52.51746574973957)
length_meter_mapunits, point_meter_result = da_4805.measureLineProjected(point_berlin_4805, 1.0, (math.pi / 2))
print('-I-> Berlin 4805 length_meter_mapunits[{}] point_meter_result[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_4805.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 9, QgsUnitTypes.DistanceDegrees, True), '0.000014733 deg')
self.assertEqual(point_meter_result.toString(7), point_berlin_4805_project.toString(7))
point_berlin_25833 = QgsPointXY(389918.0748318382, 5819698.772194743)
point_berlin_25833_project = point_berlin_25833.project(1, (math.pi / 2))
length_meter_mapunits, point_meter_result = da_25833.measureLineProjected(point_berlin_25833, 1.0, (math.pi / 2))
print('-I-> Berlin 25833 length_meter_mapunits[{}] point_meter_result[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_25833.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_25833.lengthUnits(), True), '1.0000000 m')
self.assertEqual(point_meter_result.toString(7), point_berlin_25833_project.toString(7))
if da_5665.sourceCrs().authid() != "":
point_berlin_5665 = QgsPointXY(3389996.871728864, 5822169.719727578)
point_berlin_5665_project = point_berlin_5665.project(1, (math.pi / 2))
length_meter_mapunits, point_meter_result = da_5665.measureLineProjected(point_berlin_5665, 1.0, (math.pi / 2))
print('-I-> Berlin 5665 length_meter_mapunits[{}] point_meter_result[{}]'.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_5665.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 1.0, da_5665.lengthUnits(), True), '1.0 m')
self.assertEqual(point_meter_result.toString(7), point_berlin_5665_project.toString(7))
print('\n12 points ''above over'' and on the Equator')
point_wsg84 = QgsPointXY(25.7844, 71.1725)
point_wsg84_project = QgsPointXY(25.78442775215388, 71.17249999999795)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Nordkap, Norway - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, QgsUnitTypes.DistanceDegrees, True), '0.0000278 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(24.95995, 60.16841)
point_wsg84_project = QgsPointXY(24.95996801277454, 60.16840999999877)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Helsinki, Finnland - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001801 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(12.599278, 55.692861)
point_wsg84_project = QgsPointXY(12.59929390161872, 55.69286099999897)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Copenhagen, Denmark - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001590 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-0.001389, 51.477778)
point_wsg84_project = QgsPointXY(-0.001374606184398, 51.4777779999991)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Royal Greenwich Observatory, United Kingdom - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001439 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(7.58769, 47.55814)
point_wsg84_project = QgsPointXY(7.587703287209086, 47.55813999999922)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Basel, Switzerland - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001329 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(11.255278, 43.775278)
point_wsg84_project = QgsPointXY(11.25529042107924, 43.77527799999933)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Florenz, Italy - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001242 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(14.514722, 35.899722)
point_wsg84_project = QgsPointXY(14.51473307693308, 35.89972199999949)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Valletta, Malta - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001108 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-79.933333, 32.783333)
point_wsg84_project = QgsPointXY(-79.93332232547254, 32.78333299999955)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Charlston, South Carolina - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001067 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-17.6666666, 27.733333)
point_wsg84_project = QgsPointXY(-17.66665645831515, 27.73333299999962)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Ferro, Spain - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001014 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-99.133333, 19.433333)
point_wsg84_project = QgsPointXY(-99.1333234776827, 19.43333299999975)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Mexico City, Mexico - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000952 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-79.894444, 9.341667)
point_wsg84_project = QgsPointXY(-79.89443489691369, 9.341666999999882)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Colón, Panama - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000910 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-74.075833, 4.598056)
point_wsg84_project = QgsPointXY(-74.07582398803629, 4.598055999999943)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Bogotá, Colombia - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000901 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(0, 0)
point_wsg84_project = QgsPointXY(0.000008983152841, 0)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Equator, Atlantic Ocean - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000898 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
print('\n12 points ''down under'' and 1 point that should be considered invalid')
point_wsg84 = QgsPointXY(-78.509722, -0.218611)
point_wsg84_project = QgsPointXY(-78.50971301678221, -0.218610999999997)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Quito, Ecuador - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000898 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(106.816667, -6.2)
point_wsg84_project = QgsPointXY(106.8166760356519, -6.199999999999922)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Jakarta, Indonesia - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000904 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-77.018611, -12.035)
point_wsg84_project = QgsPointXY(-77.01860181630058, -12.03499999999985)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Lima, Peru - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000918 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(25.466667, -10.716667)
point_wsg84_project = QgsPointXY(25.46667614155322, -10.71666699999986)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Kolwezi, Congo - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000914 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-70.333333, -18.483333)
point_wsg84_project = QgsPointXY(-70.3333235314429, -18.48333299999976)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Arica, Chile - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00000947 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-70.666667, -33.45)
point_wsg84_project = QgsPointXY(-70.66665624452817, -33.44999999999953)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Santiago, Chile - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001076 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(144.9604, -37.8191)
point_wsg84_project = QgsPointXY(144.96041135746983741, -37.81909999999945171)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Melbourne, Australia - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001136 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(147.29, -42.88)
point_wsg84_project = QgsPointXY(147.2900122399815, -42.87999999999934)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Hobart City,Tasmania, Australia - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001224 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(168.101667, -46.899722)
point_wsg84_project = QgsPointXY(168.101680123673, -46.89972199999923)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Ryan''s Creek Aerodrome, New Zealand - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001312 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-69.216667, -51.633333)
point_wsg84_project = QgsPointXY(-69.21665255700216, -51.6333329999991)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Río Gallegos, Argentina - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001444 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-68.3, -54.8)
point_wsg84_project = QgsPointXY(-68.29998445081456, -54.79999999999899)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Ushuaia, Tierra del Fuego, Argentina - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00001555 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-63.494444, -64.825278)
point_wsg84_project = QgsPointXY(-63.49442294002932, -64.82527799999851)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Port Lockroy, Antarctica - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00002106 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-180, -84.863272250)
point_wsg84_project = QgsPointXY(-179.9999000000025, -84.8632722499922)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-I-> Someware, Antarctica - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00010000 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
point_wsg84 = QgsPointXY(-180, -85.0511300)
point_wsg84_project = QgsPointXY(-179.9998962142197, -85.05112999999191)
length_meter_mapunits, point_meter_result = da_wsg84.measureLineProjected(point_wsg84, 1.0, (math.pi / 2))
print('-W-> Mercator''s Last Stop, Antarctica - Wsg84 - length_meter_mapunits[{}] point_meter_result[{}] '.format(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, da_wsg84.lengthUnits(), True), point_meter_result.asWkt()))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 8, QgsUnitTypes.DistanceDegrees, True), '0.00010379 deg')
self.assertEqual(point_meter_result.toString(7), point_wsg84_project.toString(7))
def testAreaMeasureAndUnits(self):
"""Test a variety of area measurements in different CRS and ellipsoid modes, to check that the
calculated areas and units are always consistent
"""
da = QgsDistanceArea()
da.setSourceCrs(3452)
da.setEllipsoidalMode(False)
da.setEllipsoid("NONE")
daCRS = QgsCoordinateReferenceSystem()
daCRS = da.sourceCrs()
polygon = QgsGeometry.fromPolygon(
[[
QgsPoint(0, 0), QgsPoint(1, 0), QgsPoint(1, 1), QgsPoint(2, 1), QgsPoint(2, 2), QgsPoint(0, 2), QgsPoint(0, 0),
]]
)
# We check both the measured area AND the units, in case the logic regarding
# ellipsoids and units changes in future
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
assert ((abs(area - 3.0) < 0.00000001 and units == QgsUnitTypes.AreaSquareDegrees) or
(abs(area - 37176087091.5) < 0.1 and units == QgsUnitTypes.AreaSquareMeters))
da.setEllipsoid("WGS84")
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
assert ((abs(area - 3.0) < 0.00000001 and units == QgsUnitTypes.AreaSquareDegrees) or
(abs(area - 37176087091.5) < 0.1 and units == QgsUnitTypes.AreaSquareMeters))
da.setEllipsoidalMode(True)
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
# should always be in Meters Squared
self.assertAlmostEqual(area, 37416879192.9, delta=0.1)
self.assertEqual(units, QgsUnitTypes.AreaSquareMeters)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareMiles)
self.assertAlmostEqual(area, 14446.7378, delta=0.001)
# now try with a source CRS which is in feet
polygon = QgsGeometry.fromPolygon(
[[
QgsPoint(1850000, 4423000), QgsPoint(1851000, 4423000), QgsPoint(1851000, 4424000), QgsPoint(1852000, 4424000), QgsPoint(1852000, 4425000), QgsPoint(1851000, 4425000), QgsPoint(1850000, 4423000)
]]
)
da.setSourceCrs(27469)
da.setEllipsoidalMode(False)
# measurement should be in square feet
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(area, 2000000, delta=0.001)
self.assertEqual(units, QgsUnitTypes.AreaSquareFeet)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareYards)
self.assertAlmostEqual(area, 222222.2222, delta=0.001)
da.setEllipsoidalMode(True)
# now should be in Square Meters again
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(area, 184149.37, delta=1.0)
self.assertEqual(units, QgsUnitTypes.AreaSquareMeters)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareYards)
self.assertAlmostEqual(area, 220240.8172549, delta=1.0)
def processAlgorithm(self, parameters, context, feedback):
line_source = self.parameterAsSource(parameters, self.LINES, context)
poly_source = self.parameterAsSource(parameters, self.POLYGONS,
context)
length_field_name = self.parameterAsString(parameters, self.LEN_FIELD,
context)
count_field_name = self.parameterAsString(parameters, self.COUNT_FIELD,
context)
fields = poly_source.fields()
if fields.lookupField(length_field_name) < 0:
fields.append(QgsField(length_field_name, QVariant.Double))
length_field_index = fields.lookupField(length_field_name)
if fields.lookupField(count_field_name) < 0:
fields.append(QgsField(count_field_name, QVariant.Int))
count_field_index = fields.lookupField(count_field_name)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields,
poly_source.wkbType(),
poly_source.sourceCrs())
spatialIndex = QgsSpatialIndex(
line_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes(
[]).setDestinationCrs(poly_source.sourceCrs(),
context.transformContext())), feedback)
distArea = QgsDistanceArea()
distArea.setSourceCrs(poly_source.sourceCrs(),
context.transformContext())
distArea.setEllipsoid(context.project().ellipsoid())
features = poly_source.getFeatures()
total = 100.0 / poly_source.featureCount() if poly_source.featureCount(
) else 0
for current, poly_feature in enumerate(features):
if feedback.isCanceled():
break
output_feature = QgsFeature()
count = 0
length = 0
if poly_feature.hasGeometry():
poly_geom = poly_feature.geometry()
has_intersections = False
lines = spatialIndex.intersects(poly_geom.boundingBox())
engine = None
if len(lines) > 0:
has_intersections = True
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(
poly_geom.constGet())
engine.prepareGeometry()
if has_intersections:
request = QgsFeatureRequest().setFilterFids(
lines).setSubsetOfAttributes([]).setDestinationCrs(
poly_source.sourceCrs(),
context.transformContext())
for line_feature in line_source.getFeatures(request):
if feedback.isCanceled():
break
if engine.intersects(
line_feature.geometry().constGet()):
outGeom = poly_geom.intersection(
line_feature.geometry())
length += distArea.measureLength(outGeom)
count += 1
output_feature.setGeometry(poly_geom)
attrs = poly_feature.attributes()
if length_field_index == len(attrs):
attrs.append(length)
else:
attrs[length_field_index] = length
if count_field_index == len(attrs):
attrs.append(count)
else:
attrs[count_field_index] = count
output_feature.setAttributes(attrs)
sink.addFeature(output_feature, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
field_name = self.parameterAsString(parameters, self.FIELD_NAME,
context)
field_type = self.TYPES[self.parameterAsEnum(parameters,
self.FIELD_TYPE, context)]
width = self.parameterAsInt(parameters, self.FIELD_LENGTH, context)
precision = self.parameterAsInt(parameters, self.FIELD_PRECISION,
context)
new_field = self.parameterAsBool(parameters, self.NEW_FIELD, context)
formula = self.parameterAsString(parameters, self.FORMULA, context)
expression = QgsExpression(formula)
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
expression.setGeomCalculator(da)
expression.setDistanceUnits(context.project().distanceUnits())
expression.setAreaUnits(context.project().areaUnits())
fields = source.fields()
field_index = fields.lookupField(field_name)
if new_field or field_index < 0:
fields.append(
QgsField(field_name, field_type, '', width, precision))
(sink, dest_id) = self.parameterAsSink(parameters,
self.OUTPUT, context, fields,
source.wkbType(),
source.sourceCrs())
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
exp_context = self.createExpressionContext(parameters, context)
if layer is not None:
exp_context.appendScope(
QgsExpressionContextUtils.layerScope(layer))
expression.prepare(exp_context)
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
rownum = current + 1
exp_context.setFeature(f)
exp_context.lastScope().setVariable("row_number", rownum)
value = expression.evaluate(exp_context)
if expression.hasEvalError():
feedback.reportError(expression.evalErrorString())
else:
attrs = f.attributes()
if new_field or field_index < 0:
attrs.append(value)
else:
attrs[field_index] = value
f.setAttributes(attrs)
sink.addFeature(f, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
class ExportGeometryInfo(QgisAlgorithm):
INPUT = 'INPUT'
METHOD = 'CALC_METHOD'
OUTPUT = 'OUTPUT'
def icon(self):
return QgsApplication.getThemeIcon("/algorithms/mAlgorithmAddGeometryAttributes.svg")
def svgIconPath(self):
return QgsApplication.iconPath("/algorithms/mAlgorithmAddGeometryAttributes.svg")
def tags(self):
return self.tr('export,add,information,measurements,areas,lengths,perimeters,latitudes,longitudes,x,y,z,extract,points,lines,polygons,sinuosity,fields').split(',')
def group(self):
return self.tr('Vector geometry')
def groupId(self):
return 'vectorgeometry'
def __init__(self):
super().__init__()
self.export_z = False
self.export_m = False
self.distance_area = None
self.calc_methods = [self.tr('Layer CRS'),
self.tr('Project CRS'),
self.tr('Ellipsoidal')]
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
self.tr('Input layer')))
self.addParameter(QgsProcessingParameterEnum(self.METHOD,
self.tr('Calculate using'), options=self.calc_methods, defaultValue=0))
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Added geom info')))
def name(self):
return 'exportaddgeometrycolumns'
def displayName(self):
return self.tr('Add geometry attributes')
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
method = self.parameterAsEnum(parameters, self.METHOD, context)
wkb_type = source.wkbType()
fields = source.fields()
new_fields = QgsFields()
if QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.PolygonGeometry:
new_fields.append(QgsField('area', QVariant.Double))
new_fields.append(QgsField('perimeter', QVariant.Double))
elif QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.LineGeometry:
new_fields.append(QgsField('length', QVariant.Double))
if not QgsWkbTypes.isMultiType(source.wkbType()):
new_fields.append(QgsField('straightdis', QVariant.Double))
new_fields.append(QgsField('sinuosity', QVariant.Double))
else:
new_fields.append(QgsField('xcoord', QVariant.Double))
new_fields.append(QgsField('ycoord', QVariant.Double))
if QgsWkbTypes.hasZ(source.wkbType()):
self.export_z = True
new_fields.append(QgsField('zcoord', QVariant.Double))
if QgsWkbTypes.hasM(source.wkbType()):
self.export_m = True
new_fields.append(QgsField('mvalue', QVariant.Double))
fields = QgsProcessingUtils.combineFields(fields, new_fields)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, wkb_type, source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
coordTransform = None
# Calculate with:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
self.distance_area = QgsDistanceArea()
if method == 2:
self.distance_area.setSourceCrs(source.sourceCrs(), context.transformContext())
self.distance_area.setEllipsoid(context.project().ellipsoid())
elif method == 1:
coordTransform = QgsCoordinateTransform(source.sourceCrs(), context.project().crs(), context.project())
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
outFeat = f
attrs = f.attributes()
inGeom = f.geometry()
if inGeom:
if coordTransform is not None:
inGeom.transform(coordTransform)
if inGeom.type() == QgsWkbTypes.PointGeometry:
attrs.extend(self.point_attributes(inGeom))
elif inGeom.type() == QgsWkbTypes.PolygonGeometry:
attrs.extend(self.polygon_attributes(inGeom))
else:
attrs.extend(self.line_attributes(inGeom))
# ensure consistent count of attributes - otherwise null
# geometry features will have incorrect attribute length
# and provider may reject them
if len(attrs) < len(fields):
attrs += [NULL] * (len(fields) - len(attrs))
outFeat.setAttributes(attrs)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def point_attributes(self, geometry):
pt = None
if not geometry.isMultipart():
pt = geometry.constGet()
else:
if geometry.numGeometries() > 0:
pt = geometry.geometryN(0)
attrs = []
if pt:
attrs.append(pt.x())
attrs.append(pt.y())
# add point z/m
if self.export_z:
attrs.append(pt.z())
if self.export_m:
attrs.append(pt.m())
return attrs
def line_attributes(self, geometry):
if geometry.isMultipart():
return [self.distance_area.measureLength(geometry)]
else:
curve = geometry.constGet()
p1 = curve.startPoint()
p2 = curve.endPoint()
straight_distance = self.distance_area.measureLine(QgsPointXY(p1), QgsPointXY(p2))
sinuosity = curve.sinuosity()
if math.isnan(sinuosity):
sinuosity = NULL
return [self.distance_area.measureLength(geometry), straight_distance, sinuosity]
def polygon_attributes(self, geometry):
area = self.distance_area.measureArea(geometry)
perimeter = self.distance_area.measurePerimeter(geometry)
return [area, perimeter]
def processAlgorithm(self, parameters, context, feedback):
if parameters[self.INPUT] == parameters[self.HUBS]:
raise QgsProcessingException(
self.tr('Same layer given for both hubs and spokes'))
point_source = self.parameterAsSource(parameters, self.INPUT, context)
hub_source = self.parameterAsSource(parameters, self.HUBS, context)
fieldName = self.parameterAsString(parameters, self.FIELD, context)
units = self.UNITS[self.parameterAsEnum(parameters, self.UNIT,
context)]
fields = point_source.fields()
fields.append(QgsField('HubName', QVariant.String))
fields.append(QgsField('HubDist', QVariant.Double))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields,
QgsWkbTypes.LineString,
point_source.sourceCrs())
index = QgsSpatialIndex(
hub_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes(
[]).setDestinationCrs(point_source.sourceCrs(),
context.transformContext())))
distance = QgsDistanceArea()
distance.setSourceCrs(point_source.sourceCrs(),
context.transformContext())
distance.setEllipsoid(context.project().ellipsoid())
# Scan source points, find nearest hub, and write to output file
features = point_source.getFeatures()
total = 100.0 / point_source.featureCount(
) if point_source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
if not f.hasGeometry():
sink.addFeature(f, QgsFeatureSink.FastInsert)
continue
src = f.geometry().boundingBox().center()
neighbors = index.nearestNeighbor(src, 1)
ft = next(
hub_source.getFeatures(QgsFeatureRequest().setFilterFid(
neighbors[0]).setSubsetOfAttributes(
[fieldName], hub_source.fields()).setDestinationCrs(
point_source.sourceCrs(),
context.transformContext())))
closest = ft.geometry().boundingBox().center()
hubDist = distance.measureLine(src, closest)
if units != self.LAYER_UNITS:
hub_dist_in_desired_units = distance.convertLengthMeasurement(
hubDist, units)
else:
hub_dist_in_desired_units = hubDist
attributes = f.attributes()
attributes.append(ft[fieldName])
attributes.append(hub_dist_in_desired_units)
feat = QgsFeature()
feat.setAttributes(attributes)
feat.setGeometry(QgsGeometry.fromPolylineXY([src, closest]))
sink.addFeature(feat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def linearMatrix(self, parameters, context, source, inField, target_source,
targetField, same_source_and_target, matType, nPoints,
feedback):
if same_source_and_target:
# need to fetch an extra point from the index, since the closest match will always be the same
# as the input feature
nPoints += 1
inIdx = source.fields().lookupField(inField)
outIdx = target_source.fields().lookupField(targetField)
fields = QgsFields()
input_id_field = source.fields()[inIdx]
input_id_field.setName('InputID')
fields.append(input_id_field)
if matType == 0:
target_id_field = target_source.fields()[outIdx]
target_id_field.setName('TargetID')
fields.append(target_id_field)
fields.append(QgsField('Distance', QVariant.Double))
else:
fields.append(QgsField('MEAN', QVariant.Double))
fields.append(QgsField('STDDEV', QVariant.Double))
fields.append(QgsField('MIN', QVariant.Double))
fields.append(QgsField('MAX', QVariant.Double))
out_wkb = QgsWkbTypes.multiType(
source.wkbType()) if matType == 0 else source.wkbType()
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields, out_wkb,
source.sourceCrs())
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
index = QgsSpatialIndex(
target_source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes(
[]).setDestinationCrs(source.sourceCrs(),
context.transformContext())),
feedback)
distArea = QgsDistanceArea()
distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
distArea.setEllipsoid(context.project().ellipsoid())
features = source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes([inIdx]))
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
inGeom = inFeat.geometry()
inID = str(inFeat.attributes()[inIdx])
featList = index.nearestNeighbor(inGeom.asPoint(), nPoints)
distList = []
vari = 0.0
request = QgsFeatureRequest().setFilterFids(
featList).setSubsetOfAttributes([outIdx]).setDestinationCrs(
source.sourceCrs(), context.transformContext())
for outFeat in target_source.getFeatures(request):
if feedback.isCanceled():
break
if same_source_and_target and inFeat.id() == outFeat.id():
continue
outID = outFeat.attributes()[outIdx]
outGeom = outFeat.geometry()
dist = distArea.measureLine(inGeom.asPoint(),
outGeom.asPoint())
if matType == 0:
out_feature = QgsFeature()
out_geom = QgsGeometry.unaryUnion(
[inFeat.geometry(),
outFeat.geometry()])
out_feature.setGeometry(out_geom)
out_feature.setAttributes([inID, outID, dist])
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
else:
distList.append(float(dist))
if matType != 0:
mean = sum(distList) / len(distList)
for i in distList:
vari += (i - mean) * (i - mean)
vari = math.sqrt(vari / len(distList))
out_feature = QgsFeature()
out_feature.setGeometry(inFeat.geometry())
out_feature.setAttributes(
[inID, mean, vari,
min(distList),
max(distList)])
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def regularMatrix(self, parameters, context, source, inField,
target_source, targetField, nPoints, feedback):
distArea = QgsDistanceArea()
distArea.setSourceCrs(source.sourceCrs(), context.transformContext())
distArea.setEllipsoid(context.project().ellipsoid())
inIdx = source.fields().lookupField(inField)
targetIdx = target_source.fields().lookupField(targetField)
index = QgsSpatialIndex(
target_source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes(
[]).setDestinationCrs(source.sourceCrs(),
context.transformContext())),
feedback)
first = True
sink = None
dest_id = None
features = source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes([inIdx]))
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
inGeom = inFeat.geometry()
if first:
featList = index.nearestNeighbor(inGeom.asPoint(), nPoints)
first = False
fields = QgsFields()
input_id_field = source.fields()[inIdx]
input_id_field.setName('ID')
fields.append(input_id_field)
for f in target_source.getFeatures(
QgsFeatureRequest().setFilterFids(
featList).setSubsetOfAttributes([
targetIdx
]).setDestinationCrs(source.sourceCrs(),
context.transformContext())):
fields.append(
QgsField(str(f[targetField]), QVariant.Double))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields,
source.wkbType(),
source.sourceCrs())
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
data = [inFeat[inField]]
for target in target_source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes(
[]).setFilterFids(featList).setDestinationCrs(
source.sourceCrs(), context.transformContext())):
if feedback.isCanceled():
break
outGeom = target.geometry()
dist = distArea.measureLine(inGeom.asPoint(),
outGeom.asPoint())
data.append(dist)
out_feature = QgsFeature()
out_feature.setGeometry(inGeom)
out_feature.setAttributes(data)
sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def testLengthMeasureAndUnits(self):
"""Test a variety of length measurements in different CRS and ellipsoid modes, to check that the
calculated lengths and units are always consistent
"""
da = QgsDistanceArea()
da.setSourceCrs(3452)
da.setEllipsoidalMode(False)
da.setEllipsoid("NONE")
# We check both the measured length AND the units, in case the logic regarding
# ellipsoids and units changes in future
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance,
QgsUnitTypes.toString(units))))
assert ((abs(distance - 2.23606797) < 0.00000001
and units == QgsUnitTypes.DistanceDegrees)
or (abs(distance - 248.52) < 0.01
and units == QgsUnitTypes.DistanceMeters))
da.setEllipsoid("WGS84")
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance,
QgsUnitTypes.toString(units))))
assert ((abs(distance - 2.23606797) < 0.00000001
and units == QgsUnitTypes.DistanceDegrees)
or (abs(distance - 248.52) < 0.01
and units == QgsUnitTypes.DistanceMeters))
da.setEllipsoidalMode(True)
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance,
QgsUnitTypes.toString(units))))
# should always be in Meters
self.assertAlmostEqual(distance, 247555.57, delta=0.01)
self.assertEqual(units, QgsUnitTypes.DistanceMeters)
# test converting the resultant length
distance = da.convertLengthMeasurement(
distance, QgsUnitTypes.DistanceNauticalMiles)
self.assertAlmostEqual(distance, 133.669, delta=0.01)
# now try with a source CRS which is in feet
da.setSourceCrs(27469)
da.setEllipsoidalMode(False)
# measurement should be in feet
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance,
QgsUnitTypes.toString(units))))
self.assertAlmostEqual(distance, 2.23606797, delta=0.000001)
self.assertEqual(units, QgsUnitTypes.DistanceFeet)
# test converting the resultant length
distance = da.convertLengthMeasurement(distance,
QgsUnitTypes.DistanceMeters)
self.assertAlmostEqual(distance, 0.6815, delta=0.001)
da.setEllipsoidalMode(True)
# now should be in Meters again
distance = da.measureLine(QgsPoint(1, 1), QgsPoint(2, 3))
units = da.lengthUnits()
print(("measured {} in {}".format(distance,
QgsUnitTypes.toString(units))))
self.assertAlmostEqual(distance, 0.67953772, delta=0.000001)
self.assertEqual(units, QgsUnitTypes.DistanceMeters)
# test converting the resultant length
distance = da.convertLengthMeasurement(distance,
QgsUnitTypes.DistanceFeet)
self.assertAlmostEqual(distance, 2.2294, delta=0.001)
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
group_field_name = self.parameterAsString(parameters, self.GROUP_FIELD,
context)
order_field_name = self.parameterAsString(parameters, self.ORDER_FIELD,
context)
date_format = self.parameterAsString(parameters, self.DATE_FORMAT,
context)
text_dir = self.parameterAsString(parameters, self.OUTPUT_TEXT_DIR,
context)
group_field_index = source.fields().lookupField(group_field_name)
order_field_index = source.fields().lookupField(order_field_name)
if group_field_index >= 0:
group_field_def = source.fields().at(group_field_index)
else:
group_field_def = None
order_field_def = source.fields().at(order_field_index)
fields = QgsFields()
if group_field_def is not None:
fields.append(group_field_def)
begin_field = QgsField(order_field_def)
begin_field.setName('begin')
fields.append(begin_field)
end_field = QgsField(order_field_def)
end_field.setName('end')
fields.append(end_field)
output_wkb = QgsWkbTypes.LineString
if QgsWkbTypes.hasM(source.wkbType()):
output_wkb = QgsWkbTypes.addM(output_wkb)
if QgsWkbTypes.hasZ(source.wkbType()):
output_wkb = QgsWkbTypes.addZ(output_wkb)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields, output_wkb,
source.sourceCrs())
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
points = dict()
features = source.getFeatures(
QgsFeatureRequest().setSubsetOfAttributes(
[group_field_index, order_field_index]),
QgsProcessingFeatureSource.FlagSkipGeometryValidityChecks)
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
if not f.hasGeometry():
continue
point = f.geometry().constGet().clone()
if group_field_index >= 0:
group = f.attributes()[group_field_index]
else:
group = 1
order = f.attributes()[order_field_index]
if date_format != '':
order = datetime.strptime(str(order), date_format)
if group in points:
points[group].append((order, point))
else:
points[group] = [(order, point)]
feedback.setProgress(int(current * total))
feedback.setProgress(0)
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
current = 0
total = 100.0 / len(points) if points else 1
for group, vertices in list(points.items()):
if feedback.isCanceled():
break
vertices.sort(key=lambda x: (x[0] is None, x[0]))
f = QgsFeature()
attributes = []
if group_field_index >= 0:
attributes.append(group)
attributes.extend([vertices[0][0], vertices[-1][0]])
f.setAttributes(attributes)
line = [node[1] for node in vertices]
if text_dir:
fileName = os.path.join(text_dir, '%s.txt' % group)
with open(fileName, 'w') as fl:
fl.write('angle=Azimuth\n')
fl.write('heading=Coordinate_System\n')
fl.write('dist_units=Default\n')
for i in range(len(line)):
if i == 0:
fl.write('startAt=%f;%f;90\n' %
(line[i].x(), line[i].y()))
fl.write('survey=Polygonal\n')
fl.write('[data]\n')
else:
angle = line[i - 1].azimuth(line[i])
distance = da.measureLine(QgsPointXY(line[i - 1]),
QgsPointXY(line[i]))
fl.write('%f;%f;90\n' % (angle, distance))
f.setGeometry(QgsGeometry(QgsLineString(line)))
sink.addFeature(f, QgsFeatureSink.FastInsert)
current += 1
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def testMeasureLineProjected(self):
# +-+
# | |
# +-+ +
# test setting/getting the source CRS
da_3068 = QgsDistanceArea()
da_wsg84 = QgsDistanceArea()
da_3068.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:3068'), QgsProject.instance().transformContext())
if (da_3068.sourceCrs().isGeographic()):
da_3068.setEllipsoid(da_3068.sourceCrs().ellipsoidAcronym())
print(("setting [{}] srid [{}] description [{}]".format(u'Soldner Berlin', da_3068.sourceCrs().authid(), da_3068.sourceCrs().description())))
self.assertEqual(da_3068.sourceCrs().authid(), 'EPSG:3068')
da_wsg84.setSourceCrs(QgsCoordinateReferenceSystem.fromOgcWmsCrs('EPSG:4326'), QgsProject.instance().transformContext())
if (da_wsg84.sourceCrs().isGeographic()):
da_wsg84.setEllipsoid(da_wsg84.sourceCrs().ellipsoidAcronym())
self.assertEqual(da_wsg84.sourceCrs().authid(), 'EPSG:4326')
print(("setting [{}] srid [{}] description [{}] isGeographic[{}]".format(u'Wsg84', da_wsg84.sourceCrs().authid(), da_wsg84.sourceCrs().description(), da_wsg84.sourceCrs().isGeographic())))
# print(("-- projectionAcronym[{}] ellipsoidAcronym[{}] toWkt[{}] mapUnits[{}] toProj4[{}]".format(da_wsg84.sourceCrs().projectionAcronym(),da_wsg84.sourceCrs().ellipsoidAcronym(), da_wsg84.sourceCrs().toWkt(),da_wsg84.sourceCrs().mapUnits(),da_wsg84.sourceCrs().toProj4())))
print(("Testing Position change for[{}] years[{}]".format(u'Ampelanlage - Potsdamer Platz, Verkehrsinsel', u'1924 and 1998')))
# 1924-10-24 SRID=3068;POINT(23099.49 20296.69)
# 1924-10-24 SRID=4326;POINT(13.37650707988041 52.50952361017194)
# 1998-10-02 SRID=3068;POINT(23082.30 20267.80)
# 1998-10-02 SRID=4326;POINT(13.37625537334001 52.50926345498337)
# values returned by SpatiaLite
point_soldner_1924 = QgsPointXY(23099.49, 20296.69)
point_soldner_1998 = QgsPointXY(23082.30, 20267.80)
distance_soldner_meters = 33.617379
azimuth_soldner_1924 = 3.678339
# ST_Transform(point_soldner_1924,point_soldner_1998,4326)
point_wsg84_1924 = QgsPointXY(13.37650707988041, 52.50952361017194)
point_wsg84_1998 = QgsPointXY(13.37625537334001, 52.50926345498337)
# ST_Distance(point_wsg84_1924,point_wsg84_1998,1)
distance_wsg84_meters = 33.617302
# ST_Distance(point_wsg84_1924,point_wsg84_1998)
# distance_wsg84_mapunits=0.000362
distance_wsg84_mapunits_format = QgsDistanceArea.formatDistance(0.000362, 7, QgsUnitTypes.DistanceDegrees, True)
# ST_Azimuth(point_wsg84_1924,point_wsg84_1998)
azimuth_wsg84_1924 = 3.674878
# ST_Azimuth(point_wsg84_1998,point_wsg84_1998)
azimuth_wsg84_1998 = 0.533282
# ST_Project(point_wsg84_1924,33.617302,3.674878)
# SRID=4326;POINT(13.37625537318728 52.50926345503591)
point_soldner_1998_project = QgsPointXY(13.37625537318728, 52.50926345503591)
# ST_Project(point_wsg84_1998,33.617302,0.533282)
# SRID=4326;POINT(13.37650708009255 52.50952361009799)
point_soldner_1924_project = QgsPointXY(13.37650708009255, 52.50952361009799)
distance_qpoint = point_soldner_1924.distance(point_soldner_1998)
azimuth_qpoint = point_soldner_1924.azimuth(point_soldner_1998)
point_soldner_1998_result = point_soldner_1924.project(distance_qpoint, azimuth_qpoint)
point_soldner_1924_result = QgsPointXY(0, 0)
point_soldner_1998_result = QgsPointXY(0, 0)
# Test meter based projected point from point_1924 to point_1998
length_1998_mapunits, point_soldner_1998_result = da_3068.measureLineProjected(point_soldner_1924, distance_soldner_meters, azimuth_qpoint)
self.assertEqual(point_soldner_1998_result.toString(6), point_soldner_1998.toString(6))
# Test degree based projected point from point_1924 1 meter due East
point_wsg84_meter_result = QgsPointXY(0, 0)
point_wsg84_1927_meter = QgsPointXY(13.37652180838435, 52.50952361017102)
length_meter_mapunits, point_wsg84_meter_result = da_wsg84.measureLineProjected(point_wsg84_1924, 1.0, (math.pi / 2))
self.assertEqual(QgsDistanceArea.formatDistance(length_meter_mapunits, 7, QgsUnitTypes.DistanceDegrees, True), '0.0000147 deg')
self.assertEqual(point_wsg84_meter_result.toString(7), point_wsg84_1927_meter.toString(7))
point_wsg84_1998_result = QgsPointXY(0, 0)
length_1928_mapunits, point_wsg84_1998_result = da_wsg84.measureLineProjected(point_wsg84_1924, distance_wsg84_meters, azimuth_wsg84_1924)
self.assertEqual(QgsDistanceArea.formatDistance(length_1928_mapunits, 7, QgsUnitTypes.DistanceDegrees, True), distance_wsg84_mapunits_format)
self.assertEqual(point_wsg84_1998_result.toString(7), point_wsg84_1998.toString(7))
class ExportGeometryInfo(QgisAlgorithm):
INPUT = 'INPUT'
METHOD = 'CALC_METHOD'
OUTPUT = 'OUTPUT'
def icon(self):
return QIcon(
os.path.join(pluginPath, 'images', 'ftools',
'export_geometry.png'))
def tags(self):
return self.tr(
'export,add,information,measurements,areas,lengths,perimeters,latitudes,longitudes,x,y,z,extract,points,lines,polygons'
).split(',')
def group(self):
return self.tr('Vector geometry')
def groupId(self):
return 'vectorgeometry'
def __init__(self):
super().__init__()
self.export_z = False
self.export_m = False
self.distance_area = None
self.calc_methods = [
self.tr('Layer CRS'),
self.tr('Project CRS'),
self.tr('Ellipsoidal')
]
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterFeatureSource(self.INPUT,
self.tr('Input layer')))
self.addParameter(
QgsProcessingParameterEnum(self.METHOD,
self.tr('Calculate using'),
options=self.calc_methods,
defaultValue=0))
self.addParameter(
QgsProcessingParameterFeatureSink(self.OUTPUT,
self.tr('Added geom info')))
def name(self):
return 'exportaddgeometrycolumns'
def displayName(self):
return self.tr('Export geometry columns')
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
method = self.parameterAsEnum(parameters, self.METHOD, context)
wkb_type = source.wkbType()
fields = source.fields()
new_fields = QgsFields()
if QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.PolygonGeometry:
new_fields.append(QgsField('area', QVariant.Double))
new_fields.append(QgsField('perimeter', QVariant.Double))
elif QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.LineGeometry:
new_fields.append(QgsField('length', QVariant.Double))
else:
new_fields.append(QgsField('xcoord', QVariant.Double))
new_fields.append(QgsField('ycoord', QVariant.Double))
if QgsWkbTypes.hasZ(source.wkbType()):
self.export_z = True
new_fields.append(QgsField('zcoord', QVariant.Double))
if QgsWkbTypes.hasM(source.wkbType()):
self.export_m = True
new_fields.append(QgsField('mvalue', QVariant.Double))
fields = QgsProcessingUtils.combineFields(fields, new_fields)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields, wkb_type,
source.sourceCrs())
coordTransform = None
# Calculate with:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
self.distance_area = QgsDistanceArea()
if method == 2:
self.distance_area.setSourceCrs(source.sourceCrs(),
context.transformContext())
self.distance_area.setEllipsoid(context.project().ellipsoid())
elif method == 1:
coordTransform = QgsCoordinateTransform(source.sourceCrs(),
context.project().crs(),
context.project())
features = source.getFeatures()
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(features):
if feedback.isCanceled():
break
outFeat = f
attrs = f.attributes()
inGeom = f.geometry()
if inGeom:
if coordTransform is not None:
inGeom.transform(coordTransform)
if inGeom.type() == QgsWkbTypes.PointGeometry:
attrs.extend(self.point_attributes(inGeom))
elif inGeom.type() == QgsWkbTypes.PolygonGeometry:
attrs.extend(self.polygon_attributes(inGeom))
else:
attrs.extend(self.line_attributes(inGeom))
outFeat.setAttributes(attrs)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}
def point_attributes(self, geometry):
pt = None
if not geometry.isMultipart():
pt = geometry.constGet()
else:
if geometry.numGeometries() > 0:
pt = geometry.geometryN(0)
attrs = []
if pt:
attrs.append(pt.x())
attrs.append(pt.y())
# add point z/m
if self.export_z:
attrs.append(pt.z())
if self.export_m:
attrs.append(pt.m())
return attrs
def line_attributes(self, geometry):
return [self.distance_area.measureLength(geometry)]
def polygon_attributes(self, geometry):
area = self.distance_area.measureArea(geometry)
perimeter = self.distance_area.measurePerimeter(geometry)
return [area, perimeter]
class ScaleBar(QgsMapCanvasItem):
def __init__(self, proj, canvas):
super(ScaleBar, self).__init__(canvas)
self.proj = proj
self.canvas = canvas
# set font
self.myfont = QFont("helvetica", 10)
self.myfontmetrics = QFontMetrics(self.myfont)
# set crs and ellipsoid
crs = self.canvas.mapSettings().destinationCrs()
self.distance_calc = QgsDistanceArea()
self.distance_calc.setSourceCrs(
crs,
QgsProject.instance().transformContext())
self.distance_calc.setEllipsoid(crs.ellipsoidAcronym())
def paint(self, painter, xxx, xxx2):
"""Paint scalebar on painter."""
mymajorticksize = 8
mypreferredsize = 1
mytextoffsetx = 3
myscalebarunit = "m"
mymapunits = QgsUnitTypes.DistanceMeters
# get height and width
canvasheight = painter.device().height()
canvaswidth = painter.device().width()
# set origins
myoriginx = canvaswidth - 40
myoriginy = canvasheight - 20
# save previous painter
painter.save()
# set rotation
painter.rotate(-self.canvas.rotation())
# set translation
painter.translate(myoriginx, myoriginy)
# calculate size of scale bar for preferred number of map units
myscalebarwidth = mypreferredsize
# if scale bar is very small reset to 1/4 of the canvs wide
if myscalebarwidth < 30:
# pixels
myscalebarwidth = canvaswidth / 4.0
# if scale bar is more than half the cnavs wide keep halving until not
while myscalebarwidth > canvaswidth / 3.0:
myscalebarwidth = myscalebarwidth / 3.0
# get the distance between 2 points
transform = self.canvas.getCoordinateTransform()
start_point = transform.toMapCoordinates(0 - myscalebarwidth, 0)
end_point = transform.toMapCoordinates(0, 0)
distance = self.distance_calc.measureLine([start_point, end_point])
# change scale (km,m,cm,mm)
if mymapunits == QgsUnitTypes.DistanceMeters:
if distance > 1000.0:
myscalebarunit = "km"
distance = distance / 1000
rounddist = round(distance, 1)
elif distance < 0.01:
myscalebarunit = "mm"
distance = distance * 1000
rounddist = round(distance, 4)
elif distance < 0.1:
myscalebarunit = "cm"
distance = distance * 100
rounddist = round(distance, 2)
else:
myscalebarunit = "m"
rounddist = round(distance, 1)
# set new scalebarwidth
myroundscalebarwidth = (rounddist * myscalebarwidth / distance)
# set qpen
mybackgroundpen = QPen(Qt.black, 4)
# create bar
mybararray = QPolygon(2)
mybararray.putPoints(0, 0 - myroundscalebarwidth,
0 + mymajorticksize / 2, 0,
0 + mymajorticksize / 2)
painter.setPen(mybackgroundpen)
# draw line
painter.drawPolyline(mybararray)
# draw 0
painter.drawText(
0 - myroundscalebarwidth - (self.myfontmetrics.width("0") / 2),
0 - (self.myfontmetrics.height() / 4), "0")
# draw max
painter.drawText(0 - (self.myfontmetrics.width(str(rounddist)) / 2),
0 - (self.myfontmetrics.height() / 4), str(rounddist))
# draw unit label
painter.drawText((0 + mytextoffsetx), (0 + mymajorticksize),
str(myscalebarunit))
# restore painter
painter.restore()
def processAlgorithm(self, feedback):
layer = self.getParameterValue(self.INPUT_LAYER)
mapping = self.getParameterValue(self.FIELDS_MAPPING)
output = self.getOutputFromName(self.OUTPUT_LAYER)
layer = dataobjects.getObjectFromUri(layer)
fields = []
expressions = []
da = QgsDistanceArea()
da.setSourceCrs(layer.crs())
da.setEllipsoidalMode(
iface.mapCanvas().mapSettings().hasCrsTransformEnabled())
da.setEllipsoid(QgsProject.instance().readEntry(
'Measure', '/Ellipsoid', GEO_NONE)[0])
exp_context = layer.createExpressionContext()
for field_def in mapping:
fields.append(QgsField(name=field_def['name'],
type=field_def['type'],
len=field_def['length'],
prec=field_def['precision']))
expression = QgsExpression(field_def['expression'])
expression.setGeomCalculator(da)
expression.setDistanceUnits(QgsProject.instance().distanceUnits())
expression.setAreaUnits(QgsProject.instance().areaUnits())
expression.prepare(exp_context)
if expression.hasParserError():
raise GeoAlgorithmExecutionException(
self.tr(u'Parser error in expression "{}": {}')
.format(unicode(expression.expression()),
unicode(expression.parserErrorString())))
expressions.append(expression)
writer = output.getVectorWriter(fields,
layer.wkbType(),
layer.crs())
# Create output vector layer with new attributes
error_exp = None
inFeat = QgsFeature()
outFeat = QgsFeature()
features = vector.features(layer)
total = 100.0 / len(features)
for current, inFeat in enumerate(features):
rownum = current + 1
geometry = inFeat.geometry()
outFeat.setGeometry(geometry)
attrs = []
for i in range(0, len(mapping)):
field_def = mapping[i]
expression = expressions[i]
exp_context.setFeature(inFeat)
exp_context.lastScope().setVariable("row_number", rownum)
value = expression.evaluate(exp_context)
if expression.hasEvalError():
error_exp = expression
break
attrs.append(value)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
feedback.setProgress(int(current * total))
del writer
if error_exp is not None:
raise GeoAlgorithmExecutionException(
self.tr(u'Evaluation error in expression "{}": {}')
.format(unicode(error_exp.expression()),
unicode(error_exp.parserErrorString())))
def processAlgorithm(self, progress):
layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
fieldName = self.getParameterValue(self.FIELD_NAME)
fieldType = self.TYPES[self.getParameterValue(self.FIELD_TYPE)]
width = self.getParameterValue(self.FIELD_LENGTH)
precision = self.getParameterValue(self.FIELD_PRECISION)
newField = self.getParameterValue(self.NEW_FIELD)
formula = self.getParameterValue(self.FORMULA)
output = self.getOutputFromName(self.OUTPUT_LAYER)
fields = layer.fields()
if newField:
fields.append(QgsField(fieldName, fieldType, '', width, precision))
writer = output.getVectorWriter(fields, layer.wkbType(),
layer.crs())
exp = QgsExpression(formula)
da = QgsDistanceArea()
da.setSourceCrs(layer.crs().srsid())
da.setEllipsoidalMode(
iface.mapCanvas().mapSettings().hasCrsTransformEnabled())
da.setEllipsoid(QgsProject.instance().readEntry(
'Measure', '/Ellipsoid', GEO_NONE)[0])
exp.setGeomCalculator(da)
exp.setDistanceUnits(QgsProject.instance().distanceUnits())
exp.setAreaUnits(QgsProject.instance().areaUnits())
exp_context = QgsExpressionContext()
exp_context.appendScope(QgsExpressionContextUtils.globalScope())
exp_context.appendScope(QgsExpressionContextUtils.projectScope())
exp_context.appendScope(QgsExpressionContextUtils.layerScope(layer))
if not exp.prepare(exp_context):
raise GeoAlgorithmExecutionException(
self.tr('Evaluation error: %s' % exp.evalErrorString()))
outFeature = QgsFeature()
outFeature.initAttributes(len(fields))
outFeature.setFields(fields)
error = ''
calculationSuccess = True
features = vector.features(layer)
total = 100.0 / len(features)
rownum = 1
for current, f in enumerate(features):
rownum = current + 1
exp_context.setFeature(f)
exp_context.lastScope().setVariable("row_number", rownum)
value = exp.evaluate(exp_context)
if exp.hasEvalError():
calculationSuccess = False
error = exp.evalErrorString()
break
else:
outFeature.setGeometry(f.geometry())
for fld in f.fields():
outFeature[fld.name()] = f[fld.name()]
outFeature[fieldName] = value
writer.addFeature(outFeature)
progress.setPercentage(int(current * total))
del writer
if not calculationSuccess:
raise GeoAlgorithmExecutionException(
self.tr('An error occurred while evaluating the calculation '
'string:\n%s' % error))
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
strategy = self.parameterAsEnum(parameters, self.STRATEGY, context)
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE,
context)
expression = QgsExpression(
self.parameterAsString(parameters, self.EXPRESSION, context))
if expression.hasParserError():
raise QgsProcessingException(expression.parserErrorString())
expressionContext = self.createExpressionContext(
parameters, context, source)
expression.prepare(expressionContext)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,
context, fields,
QgsWkbTypes.Point,
source.sourceCrs())
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
total = 100.0 / source.featureCount() if source.featureCount() else 0
current_progress = 0
for current, f in enumerate(source.getFeatures()):
if feedback.isCanceled():
break
if not f.hasGeometry():
continue
current_progress = total * current
feedback.setProgress(current_progress)
expressionContext.setFeature(f)
value = expression.evaluate(expressionContext)
if expression.hasEvalError():
feedback.pushInfo(
self.tr('Evaluation error for feature ID {}: {}').format(
f.id(), expression.evalErrorString()))
continue
fGeom = f.geometry()
engine = QgsGeometry.createGeometryEngine(fGeom.constGet())
engine.prepareGeometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(value)
else:
pointCount = int(round(value * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo(
"Skip feature {} as number of points for it is 0.".format(
f.id()))
continue
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
feature_total = total / pointCount if pointCount else 1
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
if feedback.isCanceled():
break
rx = bbox.xMinimum() + bbox.width() * random.random()
ry = bbox.yMinimum() + bbox.height() * random.random()
p = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPointXY(p)
if engine.contains(geom.constGet()) and \
vector.checkMinDistance(p, index, minDistance, points):
f = QgsFeature(nPoints)
f.initAttributes(1)
f.setFields(fields)
f.setAttribute('id', nPoints)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
index.insertFeature(f)
points[nPoints] = p
nPoints += 1
feedback.setProgress(current_progress +
int(nPoints * feature_total))
nIterations += 1
if nPoints < pointCount:
feedback.pushInfo(
self.tr('Could not generate requested number of random '
'points. Maximum number of attempts exceeded.'))
feedback.setProgress(100)
return {self.OUTPUT: dest_id}
def processAlgorithm(self, context, feedback):
layerPoints = QgsProcessingUtils.mapLayerFromString(
self.getParameterValue(self.POINTS), context)
layerHubs = QgsProcessingUtils.mapLayerFromString(
self.getParameterValue(self.HUBS), context)
fieldName = self.getParameterValue(self.FIELD)
units = self.UNITS[self.getParameterValue(self.UNIT)]
if layerPoints.source() == layerHubs.source():
raise GeoAlgorithmExecutionException(
self.tr('Same layer given for both hubs and spokes'))
fields = layerPoints.fields()
fields.append(QgsField('HubName', QVariant.String))
fields.append(QgsField('HubDist', QVariant.Double))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields, QgsWkbTypes.LineString, layerPoints.crs(), context)
index = QgsProcessingUtils.createSpatialIndex(layerHubs, context)
distance = QgsDistanceArea()
distance.setSourceCrs(layerPoints.crs())
distance.setEllipsoid(QgsProject.instance().ellipsoid())
# Scan source points, find nearest hub, and write to output file
features = QgsProcessingUtils.getFeatures(layerPoints, context)
total = 100.0 / QgsProcessingUtils.featureCount(layerPoints, context)
for current, f in enumerate(features):
src = f.geometry().boundingBox().center()
neighbors = index.nearestNeighbor(src, 1)
ft = next(
layerHubs.getFeatures(QgsFeatureRequest().setFilterFid(
neighbors[0]).setSubsetOfAttributes([fieldName],
layerHubs.fields())))
closest = ft.geometry().boundingBox().center()
hubDist = distance.measureLine(src, closest)
attributes = f.attributes()
attributes.append(ft[fieldName])
if units == 'Feet':
attributes.append(hubDist * 3.2808399)
elif units == 'Miles':
attributes.append(hubDist * 0.000621371192)
elif units == 'Kilometers':
attributes.append(hubDist / 1000.0)
elif units != 'Meters':
attributes.append(
sqrt(
pow(src.x() - closest.x(), 2.0) +
pow(src.y() - closest.y(), 2.0)))
else:
attributes.append(hubDist)
feat = QgsFeature()
feat.setAttributes(attributes)
feat.setGeometry(QgsGeometry.fromPolyline([src, closest]))
writer.addFeature(feat)
feedback.setProgress(int(current * total))
del writer
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
output_file = self.parameterAsFileOutput(parameters,
self.OUTPUT_HTML_FILE,
context)
spatialIndex = QgsSpatialIndex(source, feedback)
distance = QgsDistanceArea()
distance.setSourceCrs(source.sourceCrs(), context.transformContext())
distance.setEllipsoid(context.project().ellipsoid())
sumDist = 0.00
A = source.sourceExtent()
A = float(A.width() * A.height())
features = source.getFeatures()
count = source.featureCount()
total = 100.0 / count if count else 1
for current, feat in enumerate(features):
if feedback.isCanceled():
break
neighbourID = spatialIndex.nearestNeighbor(
feat.geometry().asPoint(), 2)[1]
request = QgsFeatureRequest().setFilterFid(
neighbourID).setSubsetOfAttributes([])
neighbour = next(source.getFeatures(request))
sumDist += distance.measureLine(neighbour.geometry().asPoint(),
feat.geometry().asPoint())
feedback.setProgress(int(current * total))
do = float(sumDist) / count
de = float(0.5 / math.sqrt(count / A))
d = float(do / de)
SE = float(0.26136 / math.sqrt(count**2 / A))
zscore = float((do - de) / SE)
results = {}
results[self.OBSERVED_MD] = do
results[self.EXPECTED_MD] = de
results[self.NN_INDEX] = d
results[self.POINT_COUNT] = count
results[self.Z_SCORE] = zscore
if output_file:
data = []
data.append('Observed mean distance: ' + str(do))
data.append('Expected mean distance: ' + str(de))
data.append('Nearest neighbour index: ' + str(d))
data.append('Number of points: ' + str(count))
data.append('Z-Score: ' + str(zscore))
self.createHTML(output_file, data)
results[self.OUTPUT_HTML_FILE] = output_file
return results
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
pointCount = self.parameterAsDouble(parameters, self.POINTS_NUMBER, context)
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE, context)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point, source.sourceCrs())
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
featureCount = source.featureCount()
total = 100.0 / pointCount if pointCount else 1
index = QgsSpatialIndex()
points = dict()
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
request = QgsFeatureRequest()
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
if feedback.isCanceled():
break
# pick random feature
fid = random.randint(0, featureCount - 1)
f = next(source.getFeatures(request.setFilterFid(fid).setSubsetOfAttributes([])))
fGeom = f.geometry()
if fGeom.isMultipart():
lines = fGeom.asMultiPolyline()
# pick random line
lineId = random.randint(0, len(lines) - 1)
vertices = lines[lineId]
else:
vertices = fGeom.asPolyline()
# pick random segment
if len(vertices) == 2:
vid = 0
else:
vid = random.randint(0, len(vertices) - 2)
startPoint = vertices[vid]
endPoint = vertices[vid + 1]
length = da.measureLine(startPoint, endPoint)
dist = length * random.random()
if dist > minDistance:
d = dist / (length - dist)
rx = (startPoint.x() + d * endPoint.x()) / (1 + d)
ry = (startPoint.y() + d * endPoint.y()) / (1 + d)
# generate random point
p = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPointXY(p)
if vector.checkMinDistance(p, index, minDistance, points):
f = QgsFeature(nPoints)
f.initAttributes(1)
f.setFields(fields)
f.setAttribute('id', nPoints)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
index.addFeature(f)
points[nPoints] = p
nPoints += 1
feedback.setProgress(int(nPoints * total))
nIterations += 1
if nPoints < pointCount:
feedback.pushInfo(self.tr('Could not generate requested number of random points. '
'Maximum number of attempts exceeded.'))
return {self.OUTPUT: dest_id}
def testAreaMeasureAndUnits(self):
"""Test a variety of area measurements in different CRS and ellipsoid modes, to check that the
calculated areas and units are always consistent
"""
da = QgsDistanceArea()
da.setSourceCrs(3452)
da.setEllipsoidalMode(False)
da.setEllipsoid("NONE")
polygon = QgsGeometry.fromPolygon([[
QgsPoint(0, 0),
QgsPoint(1, 0),
QgsPoint(1, 1),
QgsPoint(2, 1),
QgsPoint(2, 2),
QgsPoint(0, 2),
QgsPoint(0, 0),
]])
# We check both the measured area AND the units, in case the logic regarding
# ellipsoids and units changes in future
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
assert ((abs(area - 3.0) < 0.00000001
and units == QgsUnitTypes.AreaSquareDegrees)
or (abs(area - 37176087091.5) < 0.1
and units == QgsUnitTypes.AreaSquareMeters))
da.setEllipsoid("WGS84")
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
assert ((abs(area - 3.0) < 0.00000001
and units == QgsUnitTypes.AreaSquareDegrees)
or (abs(area - 37176087091.5) < 0.1
and units == QgsUnitTypes.AreaSquareMeters))
da.setEllipsoidalMode(True)
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
# should always be in Meters Squared
self.assertAlmostEqual(area, 37416879192.9, delta=0.1)
self.assertEqual(units, QgsUnitTypes.AreaSquareMeters)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareMiles)
self.assertAlmostEqual(area, 14446.7378, delta=0.001)
# now try with a source CRS which is in feet
polygon = QgsGeometry.fromPolygon([[
QgsPoint(1850000, 4423000),
QgsPoint(1851000, 4423000),
QgsPoint(1851000, 4424000),
QgsPoint(1852000, 4424000),
QgsPoint(1852000, 4425000),
QgsPoint(1851000, 4425000),
QgsPoint(1850000, 4423000)
]])
da.setSourceCrs(27469)
da.setEllipsoidalMode(False)
# measurement should be in square feet
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(area, 2000000, delta=0.001)
self.assertEqual(units, QgsUnitTypes.AreaSquareFeet)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareYards)
self.assertAlmostEqual(area, 222222.2222, delta=0.001)
da.setEllipsoidalMode(True)
# now should be in Square Meters again
area = da.measureArea(polygon)
units = da.areaUnits()
print(("measured {} in {}".format(area, QgsUnitTypes.toString(units))))
self.assertAlmostEqual(area, 184149.37, delta=1.0)
self.assertEqual(units, QgsUnitTypes.AreaSquareMeters)
# test converting the resultant area
area = da.convertAreaMeasurement(area, QgsUnitTypes.AreaSquareYards)
self.assertAlmostEqual(area, 220240.8172549, delta=1.0)
def processAlgorithm(self, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(
self.getParameterValue(self.INPUT_LAYER), context)
fieldName = self.getParameterValue(self.FIELD_NAME)
fieldType = self.TYPES[self.getParameterValue(self.FIELD_TYPE)]
width = self.getParameterValue(self.FIELD_LENGTH)
precision = self.getParameterValue(self.FIELD_PRECISION)
newField = self.getParameterValue(self.NEW_FIELD)
formula = self.getParameterValue(self.FORMULA)
output = self.getOutputFromName(self.OUTPUT_LAYER)
fields = layer.fields()
if newField:
fields.append(QgsField(fieldName, fieldType, '', width, precision))
writer = output.getVectorWriter(fields, layer.wkbType(), layer.crs(),
context)
exp = QgsExpression(formula)
da = QgsDistanceArea()
da.setSourceCrs(layer.crs())
da.setEllipsoid(QgsProject.instance().ellipsoid())
exp.setGeomCalculator(da)
exp.setDistanceUnits(QgsProject.instance().distanceUnits())
exp.setAreaUnits(QgsProject.instance().areaUnits())
exp_context = QgsExpressionContext(
QgsExpressionContextUtils.globalProjectLayerScopes(layer))
if not exp.prepare(exp_context):
raise GeoAlgorithmExecutionException(
self.tr('Evaluation error: {0}').format(exp.evalErrorString()))
outFeature = QgsFeature()
outFeature.initAttributes(len(fields))
outFeature.setFields(fields)
error = ''
calculationSuccess = True
features = QgsProcessingUtils.getFeatures(layer, context)
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
rownum = 1
for current, f in enumerate(features):
rownum = current + 1
exp_context.setFeature(f)
exp_context.lastScope().setVariable("row_number", rownum)
value = exp.evaluate(exp_context)
if exp.hasEvalError():
calculationSuccess = False
error = exp.evalErrorString()
break
else:
outFeature.setGeometry(f.geometry())
for fld in f.fields():
outFeature[fld.name()] = f[fld.name()]
outFeature[fieldName] = value
writer.addFeature(outFeature)
feedback.setProgress(int(current * total))
del writer
if not calculationSuccess:
raise GeoAlgorithmExecutionException(
self.tr('An error occurred while evaluating the calculation '
'string:\n{0}').format(error))
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
pointCount = self.parameterAsDouble(parameters, self.POINTS_NUMBER,
context)
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE,
context)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink,
dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point,
source.sourceCrs(),
QgsFeatureSink.RegeneratePrimaryKey)
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
featureCount = source.featureCount()
total = 100.0 / pointCount if pointCount else 1
index = QgsSpatialIndex()
points = dict()
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.project().ellipsoid())
request = QgsFeatureRequest()
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
if feedback.isCanceled():
break
# pick random feature
fid = random.randint(0, featureCount - 1)
f = next(
source.getFeatures(
request.setFilterFid(fid).setSubsetOfAttributes([])))
fGeom = f.geometry()
if fGeom.isMultipart():
lines = fGeom.asMultiPolyline()
# pick random line
lineId = random.randint(0, len(lines) - 1)
vertices = lines[lineId]
else:
vertices = fGeom.asPolyline()
# pick random segment
if len(vertices) == 2:
vid = 0
else:
vid = random.randint(0, len(vertices) - 2)
startPoint = vertices[vid]
endPoint = vertices[vid + 1]
length = da.measureLine(startPoint, endPoint)
dist = length * random.random()
if dist > minDistance:
d = dist / (length - dist)
rx = (startPoint.x() + d * endPoint.x()) / (1 + d)
ry = (startPoint.y() + d * endPoint.y()) / (1 + d)
# generate random point
p = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPointXY(p)
if vector.checkMinDistance(p, index, minDistance, points):
f = QgsFeature(nPoints)
f.initAttributes(1)
f.setFields(fields)
f.setAttribute('id', nPoints)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
index.addFeature(f)
points[nPoints] = p
nPoints += 1
feedback.setProgress(int(nPoints * total))
nIterations += 1
if nPoints < pointCount:
feedback.pushInfo(
self.tr(
'Could not generate requested number of random points. '
'Maximum number of attempts exceeded.'))
return {self.OUTPUT: dest_id}
