[processing] [FEATURE] SplitWithLines

Rename algorithm SplitLinesWithLines to SplitWithLines Accept polygon as input, too Use only selected lines to split with (if processing is set to use selection only) Issue log message if trying to split multi geometries Update help
2025-04-14 00:07:35 -04:00 · 2016-09-28 16:41:12 +02:00 · 2016-09-28 16:41:12 +02:00 · 0e2ef065d7
commit 0e2ef065d7
parent 986acab9cc
6 changed files with 302 additions and 7 deletions
--- a/python/plugins/processing/algs/help/qgis.yaml
+++ b/python/plugins/processing/algs/help/qgis.yaml
@ -495,9 +495,8 @@ qgis:snapgeometriestolayer: >
 qgis:snappointstogrid: >
  This algorithm modifies the position of points in a vector layer, so they fall in the coordinates of a grid.

-
-qgis:splitlineswithlines: >
-  This algorithm splits the lines in a line layer using the lines in another line layer to define the breaking points. Intersection between geometries in both layers are considered as split points.
+qgis:splitwithlines: >
+  This algorithm splits the lines or polygons in one layer using the lines in another layer to define the breaking points. Intersection between geometries in both layers are considered as split points.

 qgis:splitvectorlayer: >
  This algorithm takes a vector layer and an attribute and generates a set of vector layers in an output folder. Each of the layers created in that folder contains all features from the input layer with the same value for the specified attribute.
--- a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
+++ b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
@ -141,6 +141,7 @@ from .SetRasterStyle import SetRasterStyle
 from .SelectByExpression import SelectByExpression
 from .SelectByAttributeSum import SelectByAttributeSum
 from .HypsometricCurves import HypsometricCurves
+from .SplitWithLines import SplitWithLines
 from .SplitLinesWithLines import SplitLinesWithLines
 from .FieldsMapper import FieldsMapper
 from .Datasources2Vrt import Datasources2Vrt
@ -226,7 +227,7 @@ class QGISAlgorithmProvider(AlgorithmProvider):
                        PostGISExecuteSQL(), ImportIntoPostGIS(),
                        SetVectorStyle(), SetRasterStyle(),
                        SelectByExpression(), HypsometricCurves(),
-                        SplitLinesWithLines(), CreateConstantRaster(),
+                        SplitWithLines(), SplitLinesWithLines(),  CreateConstantRaster(),
                        FieldsMapper(), SelectByAttributeSum(), Datasources2Vrt(),
                        CheckValidity(), OrientedMinimumBoundingBox(), Smooth(),
                        ReverseLineDirection(), SpatialIndex(), DefineProjection(),
--- a/python/plugins/processing/algs/qgis/SplitLinesWithLines.py
+++ b/python/plugins/processing/algs/qgis/SplitLinesWithLines.py
@ -2,10 +2,11 @@

 """
 ***************************************************************************
-    SplitLines.py
+    SplitLinesWithLines.py
+    DEPRECATED, replaced by SplitWithLines.py
    ---------------------
    Date                 : November 2014
-    Revised              : February 2016
+    Revised              : November 2016
    Copyright            : (C) 2014 by Bernhard Ströbl
    Email                : bernhard dot stroebl at jena dot de
 ***************************************************************************
@ -17,7 +18,6 @@
 *                                                                         *
 ***************************************************************************
 """
-from builtins import next

 __author__ = 'Bernhard Ströbl'
 __date__ = 'November 2014'
@ -43,6 +43,11 @@ class SplitLinesWithLines(GeoAlgorithm):

    OUTPUT = 'OUTPUT'

+    def __init__(self):
+        GeoAlgorithm.__init__(self)
+        # this algorithm is deprecated - use SplitWithLines instead
+        self.showInToolbox = False
+
    def defineCharacteristics(self):
        self.name, self.i18n_name = self.trAlgorithm('Split lines with lines')
        self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
--- a/python/plugins/processing/algs/qgis/SplitWithLines.py
+++ b/python/plugins/processing/algs/qgis/SplitWithLines.py
@ -0,0 +1,187 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    SplitWithLines.py
+    ---------------------
+    Date                 : November 2014
+    Revised              : November 2016
+    Copyright            : (C) 2014 by Bernhard Ströbl
+    Email                : bernhard dot stroebl at jena dot de
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Bernhard Ströbl'
+__date__ = 'November 2014'
+__copyright__ = '(C) 2014, Bernhard Ströbl'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from qgis.core import QgsFeatureRequest, QgsFeature, QgsGeometry, QgsSpatialIndex, QgsWkbTypes, QgsMessageLog
+from processing.core.GeoAlgorithm import GeoAlgorithm
+from processing.core.parameters import ParameterVector
+from processing.core.outputs import OutputVector
+from processing.core.ProcessingLog import ProcessingLog
+from processing.tools import dataobjects
+from processing.tools import vector
+
+
+class SplitWithLines(GeoAlgorithm):
+
+    INPUT_A = 'INPUT_A'
+    INPUT_B = 'INPUT_B'
+
+    OUTPUT = 'OUTPUT'
+
+    def defineCharacteristics(self):
+        self.name, self.i18n_name = self.trAlgorithm('Split with lines')
+        self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
+        self.addParameter(ParameterVector(self.INPUT_A,
+                                          self.tr('Input layer, single geometries only'), [dataobjects.TYPE_VECTOR_POLYGON,
+                                          dataobjects.TYPE_VECTOR_LINE]))
+        self.addParameter(ParameterVector(self.INPUT_B,
+                                          self.tr('Split layer'), [dataobjects.TYPE_VECTOR_LINE]))
+
+        self.addOutput(OutputVector(self.OUTPUT, self.tr('Split')))
+
+    def processAlgorithm(self, progress):
+        layerA = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_A))
+        splitLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_B))
+
+        sameLayer = self.getParameterValue(self.INPUT_A) == self.getParameterValue(self.INPUT_B)
+        fieldList = layerA.fields()
+
+        writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList,
+                                                                     layerA.wkbType(), layerA.crs())
+
+        spatialIndex = QgsSpatialIndex()
+        splitGeoms = {}
+        request = QgsFeatureRequest()
+        request.setSubsetOfAttributes([])
+
+        for aSplitFeature in vector.features(splitLayer, request):
+            splitGeoms[aSplitFeature.id()] = aSplitFeature.geometry()
+            spatialIndex.insertFeature(aSplitFeature)
+            # honor the case that user has selection on split layer and has setting "use selection"
+
+        outFeat = QgsFeature()
+        features = vector.features(layerA)
+
+        if len(features) == 0:
+            total = 100
+        else:
+            total = 100.0 / float(len(features))
+
+        multiGeoms = 0 # how many multi geometries were encountered
+
+        for current, inFeatA in enumerate(features):
+            inGeom = inFeatA.geometry()
+
+            if inGeom.isMultipart():
+                multiGeoms += 1
+                # MultiGeometries are not allowed because the result of a splitted part cannot be clearly defined:
+                # 1) add both new parts as new features
+                # 2) store one part as a new feature and the other one as part of the multi geometry
+                # 2a) which part should be which, seems arbitrary
+            else:
+                attrsA = inFeatA.attributes()
+                outFeat.setAttributes(attrsA)
+                inGeoms = [inGeom]
+                lines = spatialIndex.intersects(inGeom.boundingBox())
+
+                if len(lines) > 0:  # has intersection of bounding boxes
+                    splittingLines = []
+
+                    for i in lines:
+                        try:
+                            splitGeom = splitGeoms[i]
+                        except:
+                            continue
+
+                        # check if trying to self-intersect
+                        if sameLayer:
+                            if inFeatA.id() == i:
+                                continue
+
+                        engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
+                        engine.prepareGeometry()
+
+                        if engine.intersects(splitGeom.geometry()):
+                            splittingLines.append(splitGeom)
+
+                    if len(splittingLines) > 0:
+                        for splitGeom in splittingLines:
+                            splitterPList = None
+                            outGeoms = []
+
+                            while len(inGeoms) > 0:
+                                inGeom = inGeoms.pop()
+                                engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
+                                engine.prepareGeometry()
+                                inPoints = vector.extractPoints(inGeom)
+
+                                if engine.intersects(splitGeom.geometry()):
+                                    if splitterPList == None:
+                                        splitterPList = vector.extractPoints(splitGeom)
+
+                                    try:
+                                        result, newGeometries, topoTestPoints = inGeom.splitGeometry(splitterPList, False)
+                                    except:
+                                        ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
+                                                               self.tr('Geometry exception while splitting'))
+                                        result = 1
+
+                                    # splitGeometry: If there are several intersections
+                                    # between geometry and splitLine, only the first one is considered.
+                                    if result == 0:  # split occurred
+
+                                        if inPoints == vector.extractPoints(inGeom):
+                                            # bug in splitGeometry: sometimes it returns 0 but
+                                            # the geometry is unchanged
+                                            QgsMessageLog.logMessage("appending")
+                                            outGeoms.append(inGeom)
+                                        else:
+                                            inGeoms.append(inGeom)
+
+                                            for aNewGeom in newGeometries:
+                                                inGeoms.append(aNewGeom)
+                                    else:
+                                        QgsMessageLog.logMessage("appending else")
+                                        outGeoms.append(inGeom)
+                                else:
+                                    outGeoms.append(inGeom)
+
+                            inGeoms = outGeoms
+
+                for aGeom in inGeoms:
+                    passed = True
+
+                    if QgsWkbTypes.geometryType( aGeom.wkbType() )  == QgsWkbTypes.LineGeometry \
+                            and not QgsWkbTypes.isMultiType( aGeom.wkbType() ):
+                        passed = len(aGeom.asPolyline()) > 2
+
+                        if not passed:
+                            passed = (len(aGeom.asPolyline()) == 2 and
+                                 aGeom.asPolyline()[0] != aGeom.asPolyline()[1])
+                            # sometimes splitting results in lines of zero length
+
+                    if passed:
+                        outFeat.setGeometry(aGeom)
+                        writer.addFeature(outFeat)
+
+            progress.setPercentage(int(current * total))
+
+        if multiGeoms > 0:
+            ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
+                self.tr('Feature geometry error: %s input features ignored due to multi-geometry.') % str(multiGeoms))
+
+        del writer
--- a/python/plugins/processing/tests/testdata/expected/polys_split_with_lines.gfs
+++ b/python/plugins/processing/tests/testdata/expected/polys_split_with_lines.gfs
@ -0,0 +1,38 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>polys_split_with_lines</Name>
+    <ElementPath>polys_split_with_lines</ElementPath>
+    <!--POLYGON-->
+    <GeometryType>3</GeometryType>
+    <SRSName>GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>7</FeatureCount>
+      <ExtentXMin>-1.00000</ExtentXMin>
+      <ExtentXMax>10.00000</ExtentXMax>
+      <ExtentYMin>-3.00000</ExtentYMin>
+      <ExtentYMax>6.00000</ExtentYMax>
+    </DatasetSpecificInfo>
+    <PropertyDefn>
+      <Name>fid</Name>
+      <ElementPath>fid</ElementPath>
+      <Type>String</Type>
+      <Width>7</Width>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>name</Name>
+      <ElementPath>name</ElementPath>
+      <Type>String</Type>
+      <Width>5</Width>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>intval</Name>
+      <ElementPath>intval</ElementPath>
+      <Type>Integer</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>floatval</Name>
+      <ElementPath>floatval</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+  </GMLFeatureClass>
+</GMLFeatureClassList>
--- a/python/plugins/processing/tests/testdata/expected/polys_split_with_lines.gml
+++ b/python/plugins/processing/tests/testdata/expected/polys_split_with_lines.gml
@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>-1</gml:X><gml:Y>-3</gml:Y></gml:coord>
+      <gml:coord><gml:X>10</gml:X><gml:Y>6</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                                             
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.0">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-1 -1,3 3,3 3,2 2,2 2,-1 -1,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>aaaaa</ogr:name>
+      <ogr:intval>33</ogr:intval>
+      <ogr:floatval>44.123456</ogr:floatval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.1">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>5,5 6,4 4,4 5,5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>Aaaaa</ogr:name>
+      <ogr:intval>-33</ogr:intval>
+      <ogr:floatval>0</ogr:floatval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.2">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>2,5 2,6 3,6 3,5 2,5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>bbaaa</ogr:name>
+      <ogr:floatval>0.123</ogr:floatval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.3">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6,-3 7,-2 9,-2 9,0 10,1 10,-3 6,-3</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>ASDF</ogr:name>
+      <ogr:intval>0</ogr:intval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.3">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>7,-2 6,-3 6,1 10,1 9,0 7,0 7,-2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>ASDF</ogr:name>
+      <ogr:intval>0</ogr:intval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.4">
+      <ogr:intval>120</ogr:intval>
+      <ogr:floatval>-100291.43213</ogr:floatval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:polys_split_with_lines fid="polys.5">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3,2 6,1 6,-3 2,-1 2,2 3,2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:name>elim</ogr:name>
+      <ogr:intval>2</ogr:intval>
+      <ogr:floatval>3.33</ogr:floatval>
+    </ogr:polys_split_with_lines>
+  </gml:featureMember>
+</ogr:FeatureCollection>