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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
160 lines
6.0 KiB
Python
160 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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LinesIntersection.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsFeatureRequest, QgsFeature, QgsGeometry,
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QgsWkbTypes, QgsFields,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class LinesIntersection(GeoAlgorithm):
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INPUT_A = 'INPUT_A'
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INPUT_B = 'INPUT_B'
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FIELD_A = 'FIELD_A'
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FIELD_B = 'FIELD_B'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'lines_intersection.png'))
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def group(self):
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return self.tr('Vector overlay tools')
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def name(self):
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return 'lineintersections'
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def displayName(self):
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return self.tr('Line intersections')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT_A,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterVector(self.INPUT_B,
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self.tr('Intersect layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterTableField(
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self.FIELD_A,
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self.tr('Input field to keep (leave as [not set] to keep all fields)'),
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self.INPUT_A,
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optional=True))
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self.addParameter(ParameterTableField(
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self.FIELD_B,
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self.tr('Intersect field to keep (leave as [not set] to keep all fields)'),
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self.INPUT_B,
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optional=True))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Intersections'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
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def processAlgorithm(self, context, feedback):
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layerA = dataobjects.getLayerFromString(self.getParameterValue(self.INPUT_A))
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layerB = dataobjects.getLayerFromString(self.getParameterValue(self.INPUT_B))
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fieldA = self.getParameterValue(self.FIELD_A)
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fieldB = self.getParameterValue(self.FIELD_B)
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idxA = layerA.fields().lookupField(fieldA)
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idxB = layerB.fields().lookupField(fieldB)
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if idxA != -1:
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fieldListA = QgsFields()
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fieldListA.append(layerA.fields()[idxA])
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else:
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fieldListA = layerA.fields()
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if idxB != -1:
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fieldListB = QgsFields()
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fieldListB.append(layerB.fields()[idxB])
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else:
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fieldListB = layerB.fields()
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fieldListB = vector.testForUniqueness(fieldListA, fieldListB)
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fieldListA.extend(fieldListB)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldListA, QgsWkbTypes.Point, layerA.crs(),
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context)
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spatialIndex = vector.spatialindex(layerB)
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outFeat = QgsFeature()
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features = QgsProcessingUtils.getFeatures(layerA, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layerA, context)
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hasIntersections = False
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for current, inFeatA in enumerate(features):
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inGeom = inFeatA.geometry()
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hasIntersections = False
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lines = spatialIndex.intersects(inGeom.boundingBox())
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engine = None
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if len(lines) > 0:
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hasIntersections = True
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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if hasIntersections:
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request = QgsFeatureRequest().setFilterFids(lines)
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for inFeatB in layerB.getFeatures(request):
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tmpGeom = inFeatB.geometry()
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points = []
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attrsA = inFeatA.attributes()
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if idxA != -1:
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attrsA = [attrsA[idxA]]
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attrsB = inFeatB.attributes()
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if idxB != -1:
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attrsB = [attrsB[idxB]]
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if engine.intersects(tmpGeom.geometry()):
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tempGeom = inGeom.intersection(tmpGeom)
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if tempGeom.type() == QgsWkbTypes.PointGeometry:
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if tempGeom.isMultipart():
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points = tempGeom.asMultiPoint()
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else:
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points.append(tempGeom.asPoint())
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for j in points:
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outFeat.setGeometry(tempGeom.fromPoint(j))
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attrsA.extend(attrsB)
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outFeat.setAttributes(attrsA)
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writer.addFeature(outFeat)
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feedback.setProgress(int(current * total))
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del writer
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