forked from NationalSecurityAgency/qgis-shapetools-plugin
/
createPolygon.py
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/
createPolygon.py
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import os
from geographiclib.geodesic import Geodesic
from qgis.core import (
QgsPointXY, QgsGeometry, QgsField, QgsPropertyDefinition,
QgsProject, QgsWkbTypes, QgsCoordinateTransform)
from qgis.core import (
QgsProcessing,
QgsProcessingFeatureBasedAlgorithm,
QgsProcessingParameters,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterEnum)
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtCore import QVariant, QUrl
from .settings import settings, epsg4326, geod
from .utils import tr, conversionToMeters, makeIdlCrossingsPositive, DISTANCE_LABELS
SHAPE_TYPE = [tr("Polygon"), tr("Line")]
class CreatePolygonAlgorithm(QgsProcessingFeatureBasedAlgorithm):
"""
Algorithm to create a polygon shape.
"""
PrmShapeType = 'ShapeType'
PrmNumberOfSides = 'NumberOfSides'
PrmStartingAngle = 'StartingAngle'
PrmRadius = 'Radius'
PrmUnitsOfMeasure = 'UnitsOfMeasure'
PrmExportInputGeometry = 'ExportInputGeometry'
def createInstance(self):
return CreatePolygonAlgorithm()
def name(self):
return 'createpolygon'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'images/polygon.png'))
def displayName(self):
return tr('Create polygon')
def group(self):
return tr('Geodesic vector creation')
def groupId(self):
return 'vectorcreation'
def outputName(self):
return tr('Output layer')
def helpUrl(self):
file = os.path.dirname(__file__) + '/index.html'
if not os.path.exists(file):
return ''
return QUrl.fromLocalFile(file).toString(QUrl.FullyEncoded)
def inputLayerTypes(self):
return [QgsProcessing.TypeVectorPoint]
def outputWkbType(self, input_wkb_type):
if self.shape_type == 0:
return (QgsWkbTypes.Polygon)
return (QgsWkbTypes.LineString)
def supportInPlaceEdit(self, layer):
return False
def outputFields(self, input_fields):
if self.export_geom:
name_x, name_y = settings.getGeomNames(input_fields.names())
input_fields.append(QgsField(name_x, QVariant.Double))
input_fields.append(QgsField(name_y, QVariant.Double))
return(input_fields)
def initParameters(self, config=None):
self.shape_type = 0
self.export_geom = False
self.addParameter(
QgsProcessingParameterEnum(
self.PrmShapeType,
tr('Shape type'),
options=SHAPE_TYPE,
defaultValue=0,
optional=False)
)
param = QgsProcessingParameterNumber(
self.PrmNumberOfSides,
tr('Number of sides'),
QgsProcessingParameterNumber.Integer,
defaultValue=3,
minValue=3,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmNumberOfSides,
tr('Number of sides'),
QgsPropertyDefinition.Integer))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmStartingAngle,
tr('Starting angle'),
QgsProcessingParameterNumber.Double,
defaultValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmStartingAngle,
tr('Starting angle'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
param = QgsProcessingParameterNumber(
self.PrmRadius,
tr('Radius'),
QgsProcessingParameterNumber.Double,
defaultValue=40.0,
minValue=0,
optional=False)
param.setIsDynamic(True)
param.setDynamicPropertyDefinition(QgsPropertyDefinition(
self.PrmRadius,
tr('Radius'),
QgsPropertyDefinition.Double))
param.setDynamicLayerParameterName('INPUT')
self.addParameter(param)
self.addParameter(
QgsProcessingParameterEnum(
self.PrmUnitsOfMeasure,
tr('Radius units'),
options=DISTANCE_LABELS,
defaultValue=0,
optional=False)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.PrmExportInputGeometry,
tr('Add input geometry fields to output table'),
False,
optional=True)
)
def prepareAlgorithm(self, parameters, context, feedback):
self.shape_type = self.parameterAsInt(parameters, self.PrmShapeType, context)
self.sides = self.parameterAsInt(parameters, self.PrmNumberOfSides, context)
self.sides_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmNumberOfSides)
if self.sides_dyn:
self.sides_property = parameters[self.PrmNumberOfSides]
self.angle = self.parameterAsDouble(parameters, self.PrmStartingAngle, context)
self.angle_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmStartingAngle)
if self.angle_dyn:
self.angle_property = parameters[self.PrmStartingAngle]
self.dist = self.parameterAsDouble(parameters, self.PrmRadius, context)
if self.dist <= 0:
feedback.reportError('Radius parameter must be greater than 0')
return False
self.dist_dyn = QgsProcessingParameters.isDynamic(parameters, self.PrmRadius)
if self.dist_dyn:
self.dist_property = parameters[self.PrmRadius]
unitOfDist = self.parameterAsInt(parameters, self.PrmUnitsOfMeasure, context)
self.export_geom = self.parameterAsBool(parameters, self.PrmExportInputGeometry, context)
self.measureFactor = conversionToMeters(unitOfDist)
self.dist_converted = self.dist * self.measureFactor
source = self.parameterAsSource(parameters, 'INPUT', context)
self.total_features = source.featureCount()
srcCRS = source.sourceCrs()
if srcCRS != epsg4326:
self.geomTo4326 = QgsCoordinateTransform(srcCRS, epsg4326, QgsProject.instance())
self.toSinkCrs = QgsCoordinateTransform(epsg4326, srcCRS, QgsProject.instance())
else:
self.geomTo4326 = None
self.toSinkCrs = None
self.num_bad = 0
return True
def processFeature(self, feature, context, feedback):
try:
pt = feature.geometry().asPoint()
pt_orig_x = pt.x()
pt_orig_y = pt.y()
if self.geomTo4326:
pt = self.geomTo4326.transform(pt.x(), pt.y())
if self.sides_dyn:
s, e = self.sides_property.valueAsInt(context.expressionContext(), self.sides)
if not e or s <= 2:
self.num_bad += 1
return []
else:
s = self.sides
if self.angle_dyn:
startangle, e = self.angle_property.valueAsDouble(context.expressionContext(), self.angle)
if not e:
self.num_bad += 1
return []
else:
startangle = self.angle
if self.dist_dyn:
d, e = self.dist_property.valueAsDouble(context.expressionContext(), self.dist)
d = d * self.measureFactor
if not e or d <= 0:
self.num_bad += 1
return []
else:
d = self.dist_converted
pts = []
i = s
while i >= 0:
a = (i * 360.0 / s) + startangle
i -= 1
g = geod.Direct(pt.y(), pt.x(), a, d, Geodesic.LATITUDE | Geodesic.LONGITUDE)
pts.append(QgsPointXY(g['lon2'], g['lat2']))
makeIdlCrossingsPositive(pts)
# If the Output crs is not 4326 transform the points to the proper crs
if self.toSinkCrs:
for x, ptout in enumerate(pts):
pts[x] = self.toSinkCrs.transform(ptout)
if self.shape_type == 0:
feature.setGeometry(QgsGeometry.fromPolygonXY([pts]))
else:
feature.setGeometry(QgsGeometry.fromPolylineXY(pts))
if self.export_geom:
attr = feature.attributes()
attr.append(pt_orig_x)
attr.append(pt_orig_y)
feature.setAttributes(attr)
except Exception:
self.num_bad += 1
return []
return [feature]
def postProcessAlgorithm(self, context, feedback):
if self.num_bad:
feedback.pushInfo(tr("{} out of {} features had invalid parameters and were ignored.".format(self.num_bad, self.total_features)))
return {}