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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
import os.path | ||
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from PyQt4 import QtGui | ||
from PyQt4.QtCore import * | ||
from PyQt4.QtGui import * | ||
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from qgis.core import * | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
from sextante.core.QGisLayers import QGisLayers | ||
from sextante.outputs.OutputVector import OutputVector | ||
from sextante.core.SextanteLog import SextanteLog | ||
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from sextante.parameters.ParameterVector import ParameterVector | ||
from sextante.parameters.ParameterNumber import ParameterNumber | ||
from sextante.parameters.ParameterBoolean import ParameterBoolean | ||
from sextante.core.SextanteLog import SextanteLog | ||
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from sextante.outputs.OutputVector import OutputVector | ||
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class SimplifyGeometries(GeoAlgorithm): | ||
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INPUT = "INPUT" | ||
TOLERANCE = "TOLERANCE" | ||
USE_SELECTION = "USE_SELECTION" | ||
INPUT = "INPUT" | ||
OUTPUT = "OUTPUT" | ||
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def getIcon(self): | ||
return QtGui.QIcon(os.path.dirname(__file__) + "/icons/simplify.png") | ||
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def processAlgorithm(self, progress): | ||
self.processedFeatures = 0 | ||
self.progress = progress | ||
tolerance =self.getParameterValue(SimplifyGeometries.TOLERANCE) | ||
useSelection = self.getParameterValue(SimplifyGeometries.USE_SELECTION) | ||
vlayer = QGisLayers.getObjectFromUri(self.getParameterValue(SimplifyGeometries.INPUT)) | ||
self.generalize(vlayer, useSelection, tolerance) | ||
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def defineCharacteristics(self): | ||
self.name = "Simplify geometries" | ||
self.group = "Geometry tools" | ||
self.addParameter(ParameterVector(SimplifyGeometries.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterNumber(SimplifyGeometries.TOLERANCE, "Tolerance", 0, 10000000, 1)) | ||
self.addParameter(ParameterBoolean(SimplifyGeometries.USE_SELECTION, "Use only selected features")) | ||
self.addOutput(OutputVector(SimplifyGeometries.OUTPUT, "Simplified layer")) | ||
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self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterNumber(self.TOLERANCE, "Tolerance", 0.0, 10000000.0, 1.0)) | ||
self.addParameter(ParameterBoolean(self.USE_SELECTION, "Use only selected features", False)) | ||
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def geomVertexCount(self, geometry): | ||
geomType = geometry.type() | ||
if geomType == 1: # line | ||
points = geometry.asPolyline() | ||
return len( points ) | ||
elif geomType == 2: # polygon | ||
polylines = geometry.asPolygon() | ||
points = [] | ||
for l in polylines: | ||
points.extend( l ) | ||
return len( points ) | ||
else: | ||
return None | ||
self.addOutput(OutputVector(self.OUTPUT, "Simplified layer")) | ||
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def processAlgorithm(self, progress): | ||
settings = QSettings() | ||
encoding = settings.value( "/UI/encoding", "System" ).toString() | ||
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layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT)) | ||
useSelection = self.getParameterValue(self.USE_SELECTION) | ||
tolerance =self.getParameterValue(self.TOLERANCE) | ||
output = self.getOutputValue(self.OUTPUT) | ||
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pointsBefore = 0 | ||
pointsAfter = 0 | ||
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provider = layer.dataProvider() | ||
layer.select(layer.pendingAllAttributesList()) | ||
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.pendingFields(), | ||
layer.wkbType(), provider.crs()) | ||
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def generalize( self, inputLayer, useSelection, tolerance): | ||
self.inputLayer = inputLayer | ||
self.useSelection = useSelection | ||
self.tolerance = tolerance | ||
self.pointsBefore = 0 | ||
self.pointsAfter = 0 | ||
vProvider = self.inputLayer.dataProvider() | ||
allAttrs = vProvider.attributeIndexes() | ||
vProvider.select( allAttrs ) | ||
shapeFields = vProvider.fields() | ||
crs = vProvider.crs() | ||
wkbType = self.inputLayer.wkbType() | ||
if not crs.isValid(): | ||
crs = None | ||
shapeFileWriter = self.getOutputFromName(SimplifyGeometries.OUTPUT).getVectorWriter(shapeFields, wkbType, crs ) | ||
featureId = 0 | ||
if self.useSelection: | ||
selection = self.inputLayer.selectedFeatures() | ||
self.maxRange = len( selection ) | ||
current = 0 | ||
if useSelection: | ||
selection = layer.selectedFeatures() | ||
total = 100.0 / float(len(selection)) | ||
for f in selection: | ||
featGeometry = QgsGeometry( f.geometry() ) | ||
featGeometry = QgsGeometry(f.geometry()) | ||
attrMap = f.attributeMap() | ||
self.pointsBefore += geomVertexCount( featGeometry ) | ||
newGeometry = featGeometry.simplify( self.tolerance ) | ||
self.pointsAfter += geomVertexCount( newGeometry ) | ||
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pointsBefore += self.geomVertexCount(featGeometry) | ||
newGeometry = featGeometry.simplify(tolerance) | ||
pointsAfter += self.geomVertexCount(newGeometry) | ||
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feature = QgsFeature() | ||
feature.setGeometry( newGeometry ) | ||
feature.setAttributeMap( attrMap ) | ||
shapeFileWriter.addFeature( feature ) | ||
featureId += 1 | ||
self.emit( SIGNAL( "featureProcessed()" ) ) | ||
feature.setGeometry(newGeometry) | ||
feature.setAttributeMap(attrMap) | ||
writer.addFeature(feature) | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
else: | ||
self.maxRange = vProvider.featureCount() | ||
total = 100.0 / float(provider.featureCount()) | ||
f = QgsFeature() | ||
while vProvider.nextFeature( f ): | ||
featGeometry = QgsGeometry( f.geometry() ) | ||
attrMap = f.attributeMap() | ||
self.pointsBefore += self.geomVertexCount( featGeometry ) | ||
newGeometry = featGeometry.simplify( self.tolerance ) | ||
self.pointsAfter += self.geomVertexCount( newGeometry ) | ||
feature = QgsFeature() | ||
feature.setGeometry( newGeometry ) | ||
feature.setAttributeMap( attrMap ) | ||
shapeFileWriter.addFeature( feature ) | ||
featureId += 1 | ||
self.progress.setPercentage(self.processedFeatures/self.maxRange * 100) | ||
while layer.nextFeature(f): | ||
featGeometry = QgsGeometry(f.geometry()) | ||
attrMap = f.attributeMap() | ||
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pointsBefore += self.geomVertexCount(featGeometry) | ||
newGeometry = featGeometry.simplify(tolerance) | ||
pointsAfter += self.geomVertexCount(newGeometry) | ||
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feature = QgsFeature() | ||
feature.setGeometry(newGeometry) | ||
feature.setAttributeMap(attrMap) | ||
writer.addFeature(feature) | ||
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if shapeFileWriter != None: | ||
del shapeFileWriter | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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del writer | ||
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SextanteLog.addToLog(SextanteLog.LOG_INFO, "Simplify: Input geometries have been simplified from" | ||
+ str(self.pointsBefore) + " to " + str(self.pointsAfter) + " points.") | ||
+ str(pointsBefore) + " to " + str(pointsAfter) + " points.") | ||
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def geomVertexCount(self, geometry): | ||
geomType = geometry.type() | ||
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if geomType == QGis.Line: | ||
if geometry.isMultipart(): | ||
pointsList = geometry.asMultiPolyline() | ||
points = sum( pointsList, [] ) | ||
else: | ||
points = geometry.asPolyline() | ||
return len( points ) | ||
elif geomType == QGis.Polygon: | ||
if geometry.isMultipart(): | ||
polylinesList = geometry.asMultiPolygon() | ||
polylines = sum( polylinesList, [] ) | ||
else: | ||
polylines = geometry.asPolygon() | ||
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points = [] | ||
for l in polylines: | ||
points.extend( l ) | ||
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return len( points ) | ||
else: | ||
return None |