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139 lines
6.2 KiB
Python
139 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Clip.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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from qgis.core import QGis, QgsFeature, QgsGeometry, QgsFeatureRequest, QgsWKBTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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GEOM_25D = [QGis.WKBPoint25D, QGis.WKBLineString25D, QGis.WKBPolygon25D,
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QGis.WKBMultiPoint25D, QGis.WKBMultiLineString25D,
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QGis.WKBMultiPolygon25D]
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class Clip(GeoAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Clip')
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self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
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self.addParameter(ParameterVector(Clip.INPUT,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(Clip.OVERLAY,
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self.tr('Clip layer'), [ParameterVector.VECTOR_TYPE_POLYGON]))
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self.addOutput(OutputVector(Clip.OUTPUT, self.tr('Clipped')))
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def processAlgorithm(self, progress):
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layerA = dataobjects.getObjectFromUri(
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self.getParameterValue(Clip.INPUT))
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layerB = dataobjects.getObjectFromUri(
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self.getParameterValue(Clip.OVERLAY))
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geomType = layerA.dataProvider().geometryType()
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if geomType in GEOM_25D:
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raise GeoAlgorithmExecutionException(
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self.tr('Input layer has unsupported geometry type {}').format(geomType))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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layerA.pendingFields(),
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layerA.dataProvider().geometryType(),
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layerA.dataProvider().crs())
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inFeatA = QgsFeature()
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inFeatB = QgsFeature()
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outFeat = QgsFeature()
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index = vector.spatialindex(layerB)
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selectionA = vector.features(layerA)
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current = 0
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total = 100.0 / float(len(selectionA))
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for inFeatA in selectionA:
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geom = QgsGeometry(inFeatA.geometry())
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attrs = inFeatA.attributes()
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intersects = index.intersects(geom.boundingBox())
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first = True
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found = False
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if len(intersects) > 0:
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for i in intersects:
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layerB.getFeatures(
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QgsFeatureRequest().setFilterFid(i)).nextFeature(
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inFeatB)
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tmpGeom = QgsGeometry(inFeatB.geometry())
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if tmpGeom.intersects(geom):
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found = True
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if first:
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outFeat.setGeometry(QgsGeometry(tmpGeom))
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first = False
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else:
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cur_geom = QgsGeometry(outFeat.geometry())
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new_geom = QgsGeometry(cur_geom.combine(tmpGeom))
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if new_geom.isGeosEmpty() or not new_geom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('GEOS geoprocessing error: One or '
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'more input features have invalid '
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'geometry.'))
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break
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outFeat.setGeometry(QgsGeometry(new_geom))
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if found:
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cur_geom = QgsGeometry(outFeat.geometry())
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new_geom = QgsGeometry(geom.intersection(cur_geom))
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if new_geom.wkbType() == QGis.WKBUnknown or QgsWKBTypes.flatType(new_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
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int_com = QgsGeometry(geom.combine(cur_geom))
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int_sym = QgsGeometry(geom.symDifference(cur_geom))
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new_geom = QgsGeometry(int_com.difference(int_sym))
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if new_geom.isGeosEmpty() or not new_geom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('GEOS geoprocessing error: One or more '
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'input features have invalid geometry.'))
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continue
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try:
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outFeat.setGeometry(new_geom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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except:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('Feature geometry error: One or more '
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'output features ignored due to '
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'invalid geometry.'))
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continue
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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