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review Clip tool

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alexbruy committed Mar 21, 2013
1 parent 48e9f42 commit aa4f70c095e2198ff6aabff5e81c53eb05bde742
Showing with 71 additions and 76 deletions.
  1. +71 −76 python/plugins/sextante/algs/ftools/Clip.py
@@ -23,113 +23,108 @@
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'

from sextante.core.GeoAlgorithm import GeoAlgorithm
from PyQt4.QtCore import *
from PyQt4.QtGui import *

from qgis.core import *
from sextante.parameters.ParameterVector import ParameterVector

from sextante.core.GeoAlgorithm import GeoAlgorithm
from sextante.core.QGisLayers import QGisLayers
from sextante.core.SextanteLog import SextanteLog

from sextante.parameters.ParameterVector import ParameterVector

from sextante.outputs.OutputVector import OutputVector

from sextante.algs.ftools import FToolsUtils as utils
from sextante.core.SextanteLog import SextanteLog

class Clip(GeoAlgorithm):

INPUT = "INPUT"
INPUT2 = "INPUT2"
OVERLAY = "OVERLAY"
OUTPUT = "OUTPUT"

#===========================================================================
# def getIcon(self):
# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/clip.png")
#===========================================================================

def defineCharacteristics(self):
self.name = "Clip"
self.group = "Vector overlay tools"
self.addParameter(ParameterVector(Clip.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
self.addParameter(ParameterVector(Clip.OVERLAY, "Clip layer", ParameterVector.VECTOR_TYPE_ANY))
self.addOutput(OutputVector(Clip.OUTPUT, "Clipped"))

def processAlgorithm(self, progress):
settings = QSettings()
systemEncoding = settings.value( "/UI/encoding", "System" ).toString()
output = self.getOutputValue(Clip.OUTPUT)
vlayerA = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.INPUT))
vlayerB = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.INPUT2))
layerA = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.INPUT))
layerB = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.OVERLAY))

GEOS_EXCEPT = True
FEATURE_EXCEPT = True
vproviderA = vlayerA.dataProvider()
#allAttrsA = vproviderA.attributeIndexes()
#vproviderA.select( allAttrsA )
vproviderB = vlayerB.dataProvider()
#allAttrsB = vproviderB.attributeIndexes()
#vproviderB.select( allAttrsB )

# check for crs compatibility
crsA = vproviderA.crs()
crsB = vproviderB.crs()
if not crsA.isValid() or not crsB.isValid():
SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Intersection. Invalid CRS. Results might be unexpected")
else:
if crsA != crsB:
SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Intersection. Non-matching CRSs. Results might be unexpected")
fields = vproviderA.fields()
writer = QgsVectorFileWriter( output, systemEncoding,fields, vproviderA.geometryType(), vproviderA.crs() )

writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layerA.pendingFields(),
layerA.dataProvider().geometryType(), layerA.dataProvider().crs())

inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
index = utils.createSpatialIndex(vlayerB)
#vproviderA.rewind()
nElement = 0
selectionA = QGisLayers.features(vlayerA)
nFeat = len(selectionA)

index = utils.createSpatialIndex(layerB)

selectionA = QGisLayers.features(layerA)

current = 0
total = 100.0 / float(len(selectionA))

for inFeatA in selectionA:
nElement += 1
progress.setPercentage(nElement/float(nFeat) * 100)
geom = QgsGeometry( inFeatA.geometry() )
int_geom = QgsGeometry( geom )
atMap = inFeatA.attributes()
intersects = index.intersects(geom.boundingBox())
found = False
geom = QgsGeometry(inFeatA.geometry())
attrs = inFeatA.attributes()
intersections = index.intersects(geom.boundingBox())
first = True
for id in intersects:
vlayerB.featureAtId(int(id), inFeatB)
tmpGeom = QgsGeometry(inFeatB.geometry())
if tmpGeom.intersects(geom):
found = True
if first:
outFeat.setGeometry(QgsGeometry(tmpGeom))
first = False
else:
found = False
if len(intersections) > 0:
for i in intersections:
request = QgsFeatureRequest().setFilterFid(i)
inFeatB = layerB.getFeatures(request).next()
tmpGeom = QgsGeometry(inFeatB.geometry())
if tmpGeom.intersects(geom):
found = True
if first:
outFeat.setGeometry(QgsGeometry(tmpGeom))
first = False
else:
try:
cur_geom = QgsGeometry(outFeat.geometry())
new_geom = QgsGeometry(cur_geom.combine(tmpGeom))
outFeat.setGeometry(QgsGeometry(new_geom))
except:
GEOS_EXCEPT = False
break
if found:
try:
cur_geom = QgsGeometry(outFeat.geometry())
new_geom = QgsGeometry(geom.intersection(cur_geom))
if new_geom.wkbType() == QGis.WKBNoGeometry :
int_com = QgsGeometry(geom.combine(cur_geom))
int_sym = QgsGeometry(geom.symDifference(cur_geom))
new_geom = QgsGeometry(int_com.difference(int_sym))
try:
cur_geom = QgsGeometry( outFeat.geometry() )
new_geom = QgsGeometry( cur_geom.combine( tmpGeom ) )
outFeat.setGeometry( QgsGeometry( new_geom ) )
outFeat.setGeometry(new_geom)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
except:
GEOS_EXCEPT = False
break
if found:
try:
cur_geom = QgsGeometry( outFeat.geometry() )
new_geom = QgsGeometry( geom.intersection( cur_geom ) )
if new_geom.wkbType() == 7:
int_com = QgsGeometry( geom.combine( cur_geom ) )
int_sym = QgsGeometry( geom.symDifference( cur_geom ) )
new_geom = QgsGeometry( int_com.difference( int_sym ) )
try:
outFeat.setGeometry( new_geom )
outFeat.setAttributes( atMap )
writer.addFeature( outFeat )
FEAT_EXCEPT = False
continue
except:
FEATURE_EXCEPT = False
GEOS_EXCEPT = False
continue
except:
GEOS_EXCEPT = False
continue

current += 1
progress.setPercentage(int(current * total))

del writer

if not GEOS_EXCEPT:
SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Geometry exception while computing clip")
if not FEATURE_EXCEPT:
SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Feature exception while computing clip")

def defineCharacteristics(self):
self.name = "Clip"
self.group = "Vector overlay tools"
self.addParameter(ParameterVector(Clip.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
self.addParameter(ParameterVector(Clip.INPUT2, "Clip layer", ParameterVector.VECTOR_TYPE_ANY))
self.addOutput(OutputVector(Clip.OUTPUT, "Clipped"))

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