"""

Get the intersections from a line layer with the baseline and transform them to profile coordinates.

A baseline can have breakpoints.

Select one line feature or use an one feature layer as Baseline.

"""

# Constants used to refer to parameters and outputs. They will be

# used when calling the algorithm from another algorithm, or when

# calling from the QGIS console.

OUTPUT = 'OUTPUT'

INPUTBASELINE = 'INPUTVECTOR'

INPUTRASTER = 'INPUTRASTER'

INPUTZFACTOR='INPUTZFACTOR'

INPUTINTERSECTIONLAYER='INPUTINTERSECTIONLAYER'

def initAlgorithm(self, config):

"""

Here we define the inputs and output of the algorithm, along

with some other properties.

"""

#print("initAlgorithm")

# We add the input vector features source. It can have any kind of

# geometry.

self.addParameter(

QgsProcessingParameterVectorLayer(

self.INPUTINTERSECTIONLAYER,

self.tr('Intersection Line Layer'),

[QgsProcessing.TypeVectorLine]

)

)

self.addParameter(

QgsProcessingParameterVectorLayer(

self.INPUTBASELINE,

self.tr('Profil Baseline'),

[QgsProcessing.TypeVectorLine]

)

)

self.addParameter(

QgsProcessingParameterRasterLayer(

self.INPUTRASTER,

self.tr('Elevation Raster'),

None,

False

)

)

self.addParameter(

QgsProcessingParameterNumber(

self.INPUTZFACTOR,

self.tr('Z-Factor / Ueberhoehung'),

type=QgsProcessingParameterNumber.Integer,

defaultValue=10,

optional=False,

minValue=0,

maxValue=100

)

)

# We add a feature sink in which to store our processed features (this

# usually takes the form of a newly created vector layer when the

# algorithm is run in QGIS).

self.addParameter(

QgsProcessingParameterFeatureSink(

self.OUTPUT,

self.tr('Profil_Line Intersection Points')

)

)

def processAlgorithm(self, parameters, context, feedback):

"""

Here is where the processing itself takes place.

"""

ueberhoehung = self.parameterAsInt(parameters, self.INPUTZFACTOR, context)

rasterLayer = self.parameterAsRasterLayer(parameters, self.INPUTRASTER, context)

baseLineLayer = self.parameterAsVectorLayer(parameters, self.INPUTBASELINE, context)

lineLayer = self.parameterAsVectorLayer(parameters, self.INPUTINTERSECTIONLAYER, context)

baseLine=None

#Basline Layer must have only 1 Feature

if baseLineLayer.featureCount()==1:

#baseLine must be the first feature

baseLineFeature=next(baseLineLayer.getFeatures(QgsFeatureRequest().setLimit(1)))

baseLine=baseLineFeature.geometry()

elif len(baseLineLayer.selectedFeatures())==1:

selection=baseLineLayer.selectedFeatures()

#baseLine must be the first feature

selFeats=[f for f in selection]

baseLineFeature=selFeats[0]

baseLine=baseLineFeature.geometry()

else:

msg = self.tr("Error: BaseLine layer needs exactly one line feature! "+ str(baseLineLayer.featureCount()) + " Just select one feature!")

feedback.reportError(msg)

raise QgsProcessingException(msg)

#take CRS from Rasterlayer

crsProject=rasterLayer.crs()

#check if layers have the same crs

if not baseLineLayer.crs().authid()==crsProject.authid():

# if not, transform to raster crs()

trafo1=QgsCoordinateTransform(baseLineLayer.crs(),crsProject,QgsProject.instance())

#transform BaseLine

opResult1=baseLine.transform(trafo1,QgsCoordinateTransform.ForwardTransform, False)

# if not lineLayer.crs().authid()==crsProject.authid():

# # if not, transform to raster crs()

# trafo2=QgsCoordinateTransform(lineLayer.crs(),crsProject,QgsProject.instance())

# #transform BaseLine

# opResult2=baseLine.transform(trafo2,QgsCoordinateTransform.ForwardTransform, False)

layerZFieldId=-1

#init Terrain

tm = TerrainModel(rasterLayer, feedback)

#init LaengsProfil

lp = LaengsProfil(baseLine, tm, crsProject, feedback)

try:

total = 100.0 / len(lp.linearRef.lineSegments)

except:

msg = self.tr("Keine Basislinie")

feedback.reportError(msg)

raise QgsProcessingException(msg)

bufferWidth=10 #10 m, we make an area to intersect

#get candidates featuresOnLine=[]

featuresOnLine=lp.linearRef.getFeaturesOnBaseLine(lineLayer, bufferWidth)

#Falls Linien, dann ermittle Schnittpunkte mit Laengsprofil

schnittpunkte=[] #Liste von Features

if self.isLineType(lineLayer):

#get intersection point features

schnittpunkte=self.getSchnittpunkteAusLinien(featuresOnLine, lineLayer.crs(), lp, feedback) #Um Attribute der geschnittenen Objekte zu uebernehmen, muss hier mehr uebergeben werden

if len(schnittpunkte)<1:

msg="Baseline has no intersections with current line features!"

feedback.reportError(msg)

return {self.OUTPUT: dest_id}

#calculate Z-Values

featuresWithZ=tm.addZtoPointFeatures(schnittpunkte, crsProject, layerZFieldId)

#config Output

try:

newFields=featuresWithZ[0].fields()

except:

msg="Can not transfer Z-Values to Line Intersections, may be the raster data source is not covering this whole range!"

feedback.reportError(msg)

#raise QgsProcessingException(msg)

wkbTyp=featuresWithZ[0].geometry().wkbType()

(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT,

context, newFields, wkbTyp, crsProject)

#create geometries as profil coordinates

profilFeatures=[]

iFeat=0

for current, srcFeat in enumerate(featuresWithZ):

# Stop the algorithm if cancel button has been clicked

if feedback.isCanceled():

break

srcGeom=srcFeat.geometry()

profilGeometries=lp.extractProfilGeom(srcGeom, ueberhoehung, lp.srcProfilLine)

#feedback.pushInfo("b " + str(srcFeat.attributes())+ ""+ str(profilGeometries))

for profilGeom in profilGeometries:

# build a Feature

profilFeat = QgsFeature(newFields)

profilFeat.setGeometry(profilGeom)#QgsGeometry.fromPointXY(QgsPointXY(profilGeom.x(),profilGeom.y())))

profilFeat.setAttributes(srcFeat.attributes())

# Add a feature in the sink

sink.addFeature(profilFeat, QgsFeatureSink.FastInsert)

iFeat=iFeat+1

feedback.pushInfo(str(profilFeat.attributes()))

# Update the progress bar

feedback.setProgress(int(current * total))

msgInfo=self.tr("{0} intersections where transformed to profile coordinates:").format(iFeat)

feedback.pushInfo(msgInfo)

# Return the results of the algorithm. In this case our only result is

return {self.OUTPUT: dest_id}

def name(self):

"""

Returns the algorithm name, used for identifying the algorithm. This

string should be fixed for the algorithm, and must not be localised.

The name should be unique within each provider. Names should contain

lowercase alphanumeric characters only and no spaces or other

formatting characters.

"""

return self.tr('Line_Baseline_Intersections')

def displayName(self):

"""

Returns the translated algorithm name, which should be used for any

user-visible display of the algorithm name.

"""

return self.tr('Line - Baseline Intersections')

def group(self):

"""

Returns the name of the group this algorithm belongs to. This string

should be localised.

"""

return self.tr(self.groupId())

def groupId(self):

"""

Returns the unique ID of the group this algorithm belongs to. This

string should be fixed for the algorithm, and must not be localised.

The group id should be unique within each provider. Group id should

contain lowercase alphanumeric characters only and no spaces or other

formatting characters.

"""

return 'To Profile Coordinates'

def shortHelpString(self):

"""

Returns a localised short helper string for the algorithm. This string

should provide a basic description about what the algorithm does and the

parameters and outputs associated with it..

"""

return self.tr(self.__doc__)

def icon(self):

return QIcon(os.path.join(os.path.dirname(__file__),'icons/TransformToProfil_LineIntersection_Logo.png'))

def tr(self, string):

return QCoreApplication.translate('Processing', string)

def createInstance(self):

return TransformToProfil_LineIntersection()

def isLineType(self, vectorLayer):

if vectorLayer.wkbType()==2 or vectorLayer.wkbType()==1002 or vectorLayer.wkbType()==2002 or vectorLayer.wkbType()==3002 or vectorLayer.wkbType()==5 or vectorLayer.wkbType()==1005 or vectorLayer.wkbType()==2005 or vectorLayer.wkbType()==3005:

return True

else:

return False

#extraiere Linienseqmente

def extractLineSegments(self, geom):

points=self.getVertices(geom)

#create the lines

lines=[]

i=0 # Line number

while i < len(points)-1:

p1=points[i]

p2=points[i+1]

lineGeom=QgsGeometry.fromPolyline([p1,p2])

lines.append(lineGeom)

i=i+1

return lines

#liefert die Stuetzpunkte einer Single-Geometrie

def getVertices(self, geom):

v_iter = geom.vertices()

points=[]

while v_iter.hasNext():

pt = v_iter.next()

points.append(pt)

return points

# this function create a list of point features with intersection Points and manage the geomety type Single or Multi

def getSchnittpunkteAusLinien(self, overlapFeats, featureCrs, laengsProfil, feedback):

schnittpunktFeatures=[]

ioFeat=0

countPoints=0

try:

for feat in overlapFeats:

#Feature bekommt neues Attribut Station

if ioFeat==0:

fields=feat.fields()

fields.append(QgsField("station", QVariant.Double))

schnittpunktFeaturesOfThisLine=[]

#check if Multipolygon

iMulti=0

tempGeom=QgsGeometry()

tempGeom.fromWkb(feat.geometry().asWkb())

#transform geom to Project.crs() if crs a different

if not featureCrs.authid()==QgsProject.instance().crs().authid():

trafo=QgsCoordinateTransform(featureCrs, QgsProject.instance().crs(), QgsProject.instance())

#transform Geom to Project.crs()

tempGeom.transform(trafo,QgsCoordinateTransform.ForwardTransform, False)

if tempGeom.isMultipart:

multiGeom = tempGeom.asMultiPolyline()

#for singleLine in tempGeom.parts(): #ab QGIS 3.6

for singleLineVertices in multiGeom: ############## Achtung normalerweise wird diese Schleife zum Auflösen des Multiparts benoetigt

points=[]

for pxy in singleLineVertices:

points.append(QgsPoint(pxy.x(), pxy.y()))

singleLine=QgsGeometry().fromPolyline(points)

#feedback.pushInfo(str(iMulti) + " MultiGeom: " + str(type(feat.geometry())))

#feedback.pushInfo( str( singleLine.asWkt() ) +"\n"+ str(singleLineVertices))

schnittpunktFeaturesOfThisLinePart = self.makeIntersectionFeatures(feat, singleLine, laengsProfil, fields, feedback)

#feedback.pushInfo("Multi-Schnittpunkte: " + str( schnittpunktFeaturesOfThisLinePart ) )

for item in schnittpunktFeaturesOfThisLinePart:

schnittpunktFeaturesOfThisLine.append(item)

iMulti=iMulti+1

else: # single Geometry

#feedback.pushInfo("singleGeom: " + str(type(feat.geometry())))

schnittpunktFeaturesOfThisLine = self.makeIntersectionFeatures(feat, tempGeom, laengsProfil, fields, feedback)

#add to list

for schnittFeat in schnittpunktFeaturesOfThisLine: #Intersection Feature in project.crs()

schnittpunktFeatures.append(schnittFeat)

#feedback.pushInfo(str(schnittFeat.attributes()))

ioFeat=ioFeat+1

#count Intersections

countPoints=countPoints+len(schnittpunktFeaturesOfThisLine)

except:

msg = self.tr("Error: Creating Intesections Geometry {0} Feature {1}").format(str(type(feat.geometry())), str(feat.attributes()))

feedback.reportError(msg)

raise QgsProcessingException(msg)

msgInfo=self.tr("Intersected Lines: {0} Intersections: {1}").format(ioFeat, countPoints)

feedback.pushInfo(msgInfo)

return schnittpunktFeatures

# this function create a list of point features with intersection Points

def makeIntersectionFeatures(self, feat, line, laengsProfil, newfields, feedback):

schnittpunktFeatures=[]

countPoints=0

#explode polyline, get each line segment as LineString in a list

try:

linesOfPolyLine = self.extractLineSegments(line)

except:

msg = self.tr("Error: Explode Line Segments for Geometry {0} Feature {1}").format(line.asWkt(), feat.attributes())

feedback.reportError(msg)

raise QgsProcessingException(msg)

intersectionPoints=[]

stations=[]

#get Intersection Points for each line seqment and add to list's

for iSeq,lineP in enumerate(linesOfPolyLine):

points, stats=laengsProfil.linearRef.getIntersectionPointsofPolyLine(lineP)

if not points is None and not stats is None:

for i, point in enumerate(points):

intersectionPoints.append( point )

stations.append( stats[i] )

#feedback.pushInfo(str(i) + ": "+ point.asWkt())

#make features from the intersection points and take over the line attributes

if not intersectionPoints is None:

for i in range( len( intersectionPoints ) ):

try:

pt=intersectionPoints[i].asPoint()

schnittPunktFeat=QgsFeature(newfields) #Feature with extra attribut

schnittPunktFeat.setGeometry(intersectionPoints[i])

attrs=feat.attributes()

attrs.append(stations[i]) # station is saved in extra Attribute

#set new attributes with station

schnittPunktFeat.setAttributes(attrs)

schnittpunktFeatures.append(schnittPunktFeat)

except:

msg = self.tr("Error: Creating Intesections Geometry {0} Feature {1}").format(str(type(intersectionPoints[i].geometry())), str(intersectionPoints[i].attributes()))

feedback.reportError(msg)

raise QgsProcessingException(msg)