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124 lines
4.5 KiB
Python
124 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Difference.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 PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.ProcessingLog import ProcessingLog
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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.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class Difference(GeoAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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#==========================================================================
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#def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/difference.png")
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#==========================================================================
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def defineCharacteristics(self):
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self.name = 'Difference'
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self.group = 'Vector overlay tools'
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self.addParameter(ParameterVector(Difference.INPUT, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(Difference.OVERLAY,
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'Difference layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addOutput(OutputVector(Difference.OUTPUT, 'Difference'))
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def processAlgorithm(self, progress):
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layerA = dataobjects.getObjectFromUri(
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self.getParameterValue(Difference.INPUT))
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layerB = dataobjects.getObjectFromUri(
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self.getParameterValue(Difference.OVERLAY))
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GEOS_EXCEPT = True
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FEATURE_EXCEPT = True
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writer = self.getOutputFromName(
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Difference.OUTPUT).getVectorWriter(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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add = True
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geom = QgsGeometry(inFeatA.geometry())
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diff_geom = QgsGeometry(geom)
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attrs = inFeatA.attributes()
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intersections = index.intersects(geom.boundingBox())
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for i in intersections:
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request = QgsFeatureRequest().setFilterFid(i)
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inFeatB = layerB.getFeatures(request).next()
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tmpGeom = QgsGeometry(inFeatB.geometry())
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try:
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if diff_geom.intersects(tmpGeom):
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diff_geom = QgsGeometry(diff_geom.difference(tmpGeom))
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except:
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GEOS_EXCEPT = False
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add = False
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break
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if add:
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try:
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outFeat.setGeometry(diff_geom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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except:
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FEATURE_EXCEPT = False
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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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if not GEOS_EXCEPT:
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ProcessingLog.addToLog(
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ProcessingLog.LOG_WARNING,
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'Geometry exception while computing difference')
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if not FEATURE_EXCEPT:
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ProcessingLog.addToLog(
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ProcessingLog.LOG_WARNING,
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'Feature exception while computing difference')
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