/
doGeometry.py
1211 lines (1131 loc) · 47.1 KB
/
doGeometry.py
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# -*- coding: utf-8 -*-
#-----------------------------------------------------------
#
# fTools
# Copyright (C) 2008-2011 Carson Farmer
# EMAIL: carson.farmer (at) gmail.com
# WEB : http://www.ftools.ca/fTools.html
#
# A collection of data management and analysis tools for vector data
#
#-----------------------------------------------------------
#
# licensed under the terms of GNU GPL 2
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#---------------------------------------------------------------------
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from ui_frmGeometry import Ui_Dialog
import ftools_utils
import math
from itertools import izip
import voronoi
from sets import Set
class GeometryDialog( QDialog, Ui_Dialog ):
def __init__( self, iface, function ):
QDialog.__init__( self, iface.mainWindow() )
self.iface = iface
self.setupUi( self )
self.myFunction = function
self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok )
QObject.connect( self.toolOut, SIGNAL( "clicked()" ), self.outFile )
if self.myFunction == 1:
QObject.connect( self.inShape, SIGNAL( "currentIndexChanged( QString )" ), self.update )
elif self.myFunction == 5:
QObject.connect( self.chkWriteShapefile, SIGNAL( "stateChanged( int )" ), self.updateGui )
self.updateGui()
self.manageGui()
self.success = False
self.cancel_close = self.buttonBox_2.button( QDialogButtonBox.Close )
self.progressBar.setValue( 0 )
def update( self ):
self.cmbField.clear()
inputLayer = unicode( self.inShape.currentText() )
if inputLayer != "":
changedLayer = ftools_utils.getVectorLayerByName( inputLayer )
changedField = ftools_utils.getFieldList( changedLayer )
for i in changedField:
self.cmbField.addItem( unicode( changedField[ i ].name() ) )
self.cmbField.addItem( "--- " + self.tr( "Merge all" ) + " ---" )
def accept( self ):
if self.inShape.currentText() == "":
QMessageBox.information( self, self.tr( "Geometry" ),
self.tr( "Please specify input vector layer" ) )
elif self.outShape.text() == "" and self.myFunction != 5:
QMessageBox.information( self, self.tr( "Geometry" ),
self.tr( "Please specify output shapefile" ) )
elif self.lineEdit.isVisible() and self.lineEdit.value() < 0.00:
QMessageBox.information( self, self.tr( "Geometry" ),
self.tr( "Please specify valid tolerance value" ) )
elif self.cmbField.isVisible() and self.cmbField.currentText() == "":
QMessageBox.information( self, self.tr( "Geometry" ),
self.tr( "Please specify valid UID field" ) )
else:
self.outShape.clear()
self.geometry( self.inShape.currentText(), self.lineEdit.value(),
self.cmbField.currentText() )
def outFile( self ):
self.outShape.clear()
(self.shapefileName, self.encoding) = ftools_utils.saveDialog( self )
if self.shapefileName is None or self.encoding is None:
return
self.outShape.setText( QString( self.shapefileName ) )
def manageGui( self ):
self.lblField.setVisible( False )
self.cmbField.setVisible( False )
self.lblCalcType.setVisible( False )
self.cmbCalcType.setVisible( False )
self.chkUseSelection.setVisible( False )
self.chkByFeatures.setVisible( False )
self.chkWriteShapefile.setVisible( False )
if self.myFunction == 1: # Singleparts to multipart
self.setWindowTitle( self.tr( "Singleparts to multipart" ) )
self.lineEdit.setVisible( False )
self.label.setVisible( False )
self.lblOutputShapefile.setText( self.tr( "Output shapefile" ) )
self.cmbField.setVisible( True )
self.lblField.setVisible( True )
elif self.myFunction == 2: # Multipart to singleparts
self.setWindowTitle( self.tr( "Multipart to singleparts" ) )
self.lineEdit.setVisible( False )
self.label.setVisible( False )
self.lblOutputShapefile.setText( self.tr( "Output shapefile" ) )
elif self.myFunction == 3: # Extract nodes
self.setWindowTitle( self.tr( "Extract nodes" ) )
self.lineEdit.setVisible( False )
self.label.setVisible( False )
elif self.myFunction == 4: # Polygons to lines
self.setWindowTitle( self.tr( "Polygons to lines" ) )
self.lblOutputShapefile.setText( self.tr( "Output shapefile" ) )
self.label_3.setText( self.tr( "Input polygon vector layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
elif self.myFunction == 5: # Export/Add geometry columns
self.setWindowTitle( self.tr( "Export/Add geometry columns" ) )
self.lblOutputShapefile.setText( self.tr( "Output shapefile" ) )
self.label_3.setText( self.tr( "Input vector layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
# populate calculation types
self.lblCalcType.setVisible( True )
self.cmbCalcType.setVisible( True )
self.cmbCalcType.addItem( self.tr( "Layer CRS" ) )
self.cmbCalcType.addItem( self.tr( "Project CRS" ) )
self.cmbCalcType.addItem( self.tr( "Ellipsoid" ) )
self.chkWriteShapefile.setVisible( True )
self.chkWriteShapefile.setChecked( False )
self.lblOutputShapefile.setVisible( False )
elif self.myFunction == 7: # Polygon centroids
self.setWindowTitle( self.tr( "Polygon centroids" ) )
self.lblOutputShapefile.setText( self.tr( "Output point shapefile" ) )
self.label_3.setText( self.tr( "Input polygon vector layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
else:
if self.myFunction == 8: # Delaunay triangulation
self.setWindowTitle( self.tr( "Delaunay triangulation" ) )
self.label_3.setText( self.tr( "Input point vector layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
elif self.myFunction == 10: # Voronoi Polygons
self.setWindowTitle( self.tr( "Voronoi polygon" ) )
self.label_3.setText( self.tr( "Input point vector layer" ) )
self.label.setText( self.tr( "Buffer region" ) )
self.lineEdit.setSuffix( " %" )
self.lineEdit.setRange( 0, 100 )
self.lineEdit.setSingleStep( 5 )
self.lineEdit.setValue( 0 )
elif self.myFunction == 11: #Lines to polygons
self.setWindowTitle( self.tr( "Lines to polygons" ) )
self.lblOutputShapefile.setText( self.tr( "Output shapefile" ) )
self.label_3.setText( self.tr( "Input line vector layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
else: # Polygon from layer extent
self.setWindowTitle( self.tr( "Polygon from layer extent" ) )
self.label_3.setText( self.tr( "Input layer" ) )
self.label.setVisible( False )
self.lineEdit.setVisible( False )
self.chkByFeatures.setVisible( True )
self.chkUseSelection.setVisible( True )
self.lblOutputShapefile.setText( self.tr( "Output polygon shapefile" ) )
self.resize( 381, 100 )
self.populateLayers()
def updateGui( self ):
if self.chkWriteShapefile.isChecked():
self.lineEdit.setEnabled( True )
self.toolOut.setEnabled( True )
else:
self.lineEdit.setEnabled( False )
self.toolOut.setEnabled( False )
def populateLayers( self ):
self.inShape.clear()
if self.myFunction == 3 or self.myFunction == 6:
myList = ftools_utils.getLayerNames( [ QGis.Polygon, QGis.Line ] )
elif self.myFunction == 4 or self.myFunction == 7:
myList = ftools_utils.getLayerNames( [ QGis.Polygon ] )
elif self.myFunction == 8 or self.myFunction == 10:
myList = ftools_utils.getLayerNames( [ QGis.Point ] )
elif self.myFunction == 9:
myList = ftools_utils.getLayerNames( "all" )
elif self.myFunction == 11:
myList = ftools_utils.getLayerNames( [ QGis.Line ] )
else:
myList = ftools_utils.getLayerNames( [ QGis.Point, QGis.Line, QGis.Polygon ] )
self.inShape.addItems( myList )
#1: Singleparts to multipart
#2: Multipart to singleparts
#3: Extract nodes
#4: Polygons to lines
#5: Export/Add geometry columns
#6: Simplify geometries (disabled)
#7: Polygon centroids
#8: Delaunay triangulation
#9: Polygon from layer extent
#10: Voronoi polygons
#11: Lines to polygons
def geometry( self, myLayer, myParam, myField ):
if self.myFunction == 9:
vlayer = ftools_utils.getMapLayerByName( myLayer )
else:
vlayer = ftools_utils.getVectorLayerByName( myLayer )
error = False
if ( self.myFunction == 5 and self.chkWriteShapefile.isChecked() ) or self.myFunction != 5:
check = QFile( self.shapefileName )
if check.exists():
if not QgsVectorFileWriter.deleteShapeFile( self.shapefileName ):
QMessageBox.warning( self, self.tr( "Geometry"),
self.tr( "Unable to delete existing shapefile." ) )
return
if self.myFunction == 5 and not self.chkWriteShapefile.isChecked():
self.shapefileName = None
self.encoding = None
self.buttonOk.setEnabled( False )
self.testThread = geometryThread( self.iface.mainWindow(), self, self.myFunction,
vlayer, myParam, myField, self.shapefileName, self.encoding,
self.cmbCalcType.currentIndex(), self.chkWriteShapefile.isChecked(),
self.chkByFeatures.isChecked(), self.chkUseSelection.isChecked() )
QObject.connect( self.testThread, SIGNAL( "runFinished( PyQt_PyObject )" ), self.runFinishedFromThread )
QObject.connect( self.testThread, SIGNAL( "runStatus( PyQt_PyObject )" ), self.runStatusFromThread )
QObject.connect( self.testThread, SIGNAL( "runRange( PyQt_PyObject )" ), self.runRangeFromThread )
self.cancel_close.setText( self.tr( "Cancel" ) )
QObject.connect( self.cancel_close, SIGNAL( "clicked()" ), self.cancelThread )
self.testThread.start()
def cancelThread( self ):
self.testThread.stop()
self.buttonOk.setEnabled( True )
def runFinishedFromThread( self, success ):
self.testThread.stop()
self.buttonOk.setEnabled( True )
extra = ""
if success == "math_error":
QMessageBox.warning( self, self.tr( "Geometry" ),
self.tr( "Error processing specified tolerance!\nPlease choose larger tolerance..." ) )
if not QgsVectorFileWriter.deleteShapeFile( self.shapefileName ):
QMessageBox.warning( self, self.tr( "Geometry" ),
self.tr( "Unable to delete incomplete shapefile." ) )
elif success == "attr_error":
QMessageBox.warning( self, self.tr( "Geometry" ),
self.tr( "At least two features must have same attribute value!\nPlease choose another field..." ) )
if not QgsVectorFileWriter.deleteShapeFile( self.shapefileName ):
QMessageBox.warning( self, self.tr( "Geometry" ),
self.tr( "Unable to delete incomplete shapefile." ) )
else:
if success == "valid_error":
extra = self.tr( "One or more features in the output layer may have invalid "
+ "geometry, please check using the check validity tool\n" )
success = True
self.cancel_close.setText( "Close" )
QObject.disconnect( self.cancel_close, SIGNAL( "clicked()" ), self.cancelThread )
if success:
if ( self.myFunction == 5 and self.chkWriteShapefile.isChecked() ) or self.myFunction != 5:
addToTOC = QMessageBox.question( self, self.tr("Geometry"),
self.tr( "Created output shapefile:\n%1\n%2\n\nWould you like to add the new layer to the TOC?" ).arg( unicode( self.shapefileName ) ).arg( extra ),
QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton )
if addToTOC == QMessageBox.Yes:
if not ftools_utils.addShapeToCanvas( unicode( self.shapefileName ) ):
QMessageBox.warning( self, self.tr( "Geometry"),
self.tr( "Error loading output shapefile:\n%1" ).arg( unicode( self.shapefileName ) ) )
self.populateLayers()
else:
QMessageBox.information( self, self.tr( "Geometry" ),
self.tr( "Layer '%1' updated" ).arg( self.inShape.currentText() ) )
else:
QMessageBox.warning( self, self.tr( "Geometry" ), self.tr( "Error writing output shapefile." ) )
def runStatusFromThread( self, status ):
self.progressBar.setValue( status )
def runRangeFromThread( self, range_vals ):
self.progressBar.setRange( range_vals[ 0 ], range_vals[ 1 ] )
class geometryThread( QThread ):
def __init__( self, parentThread, parentObject, function, vlayer, myParam,
myField, myName, myEncoding, myCalcType, myNewShape, myByFeatures,
myUseSelection ):
QThread.__init__( self, parentThread )
self.parent = parentObject
self.running = False
self.myFunction = function
self.vlayer = vlayer
self.myParam = myParam
self.myField = myField
self.myName = myName
self.myEncoding = myEncoding
self.myCalcType = myCalcType
self.writeShape = myNewShape
self.byFeatures = myByFeatures
self.useSelection = myUseSelection
def run( self ):
self.running = True
if self.myFunction == 1: # Singleparts to multipart
success = self.single_to_multi()
elif self.myFunction == 2: # Multipart to singleparts
success = self.multi_to_single()
elif self.myFunction == 3: # Extract nodes
success = self.extract_nodes()
elif self.myFunction == 4: # Polygons to lines
success = self.polygons_to_lines()
elif self.myFunction == 5: # Export/Add geometry columns
success = self.export_geometry_info()
# note that 6 used to be associated with simplify_geometry
elif self.myFunction == 7: # Polygon centroids
success = self.polygon_centroids()
elif self.myFunction == 8: # Delaunay triangulation
success = self.delaunay_triangulation()
elif self.myFunction == 9: # Polygon from layer extent
if self.byFeatures:
success = self.feature_extent()
else:
success = self.layer_extent()
elif self.myFunction == 10: # Voronoi Polygons
success = self.voronoi_polygons()
elif self.myFunction == 11: # Lines to polygons
success = self.lines_to_polygons()
self.emit( SIGNAL( "runFinished( PyQt_PyObject )" ), success )
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
def stop( self ):
self.running = False
def single_to_multi( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
allValid = True
geomType = self.singleToMultiGeom( vprovider.geometryType() )
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
geomType, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
index = vprovider.fieldNameIndex( self.myField )
if not index == -1:
unique = ftools_utils.getUniqueValues( vprovider, int( index ) )
else:
unique = [ QVariant( QString() ) ]
nFeat = vprovider.featureCount() * len( unique )
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
merge_all = self.myField == QString( "--- " + self.tr( "Merge all" ) + " ---" )
if not len( unique ) == self.vlayer.featureCount() or merge_all:
for i in unique:
vprovider.rewind()
multi_feature= []
first = True
vprovider.select( allAttrs )
while vprovider.nextFeature( inFeat ):
atMap = inFeat.attributeMap()
if not merge_all:
idVar = atMap[ index ]
else:
idVar = QVariant( QString() )
if idVar.toString().trimmed() == i.toString().trimmed() or merge_all:
if first:
atts = atMap
first = False
inGeom = QgsGeometry( inFeat.geometry() )
vType = inGeom.type()
feature_list = self.extractAsMulti( inGeom )
multi_feature.extend( feature_list )
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
outFeat.setAttributeMap( atts )
outGeom = QgsGeometry( self.convertGeometry( multi_feature, vType ) )
if not outGeom.isGeosValid():
allValid = "valid_error"
outFeat.setGeometry( outGeom )
writer.addFeature( outFeat )
del writer
else:
return "attr_error"
return allValid
def multi_to_single( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
geomType = self.multiToSingleGeom( vprovider.geometryType() )
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
geomType, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
nFeat = vprovider.featureCount()
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
while vprovider.nextFeature( inFeat ):
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
inGeom = inFeat.geometry()
atMap = inFeat.attributeMap()
featList = self.extractAsSingle( inGeom )
outFeat.setAttributeMap( atMap )
for i in featList:
outFeat.setGeometry( i )
writer.addFeature( outFeat )
del writer
return True
def extract_nodes( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPoint, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
nFeat = vprovider.featureCount()
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
while vprovider.nextFeature( inFeat ):
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
inGeom = inFeat.geometry()
atMap = inFeat.attributeMap()
pointList = ftools_utils.extractPoints( inGeom )
outFeat.setAttributeMap( atMap )
for i in pointList:
outFeat.setGeometry( outGeom.fromPoint( i ) )
writer.addFeature( outFeat )
del writer
return True
def polygons_to_lines( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBLineString, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
nFeat = vprovider.featureCount()
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0)
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
while vprovider.nextFeature( inFeat ):
multi = False
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
inGeom = inFeat.geometry()
if inGeom.isMultipart():
multi = True
atMap = inFeat.attributeMap()
lineList = self.extractAsLine( inGeom )
outFeat.setAttributeMap( atMap )
for h in lineList:
outFeat.setGeometry( outGeom.fromPolyline( h ) )
writer.addFeature( outFeat )
del writer
return True
def lines_to_polygons( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPolygon, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
nFeat = vprovider.featureCount()
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0)
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
while vprovider.nextFeature( inFeat ):
outGeomList = []
multi = False
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
if inFeat.geometry().isMultipart():
outGeomList = inFeat.geometry().asMultiPolyline()
multi = True
else:
outGeomList.append( inFeat.geometry().asPolyline() )
polyGeom = self.remove_bad_lines( outGeomList )
if len( polyGeom ) <> 0:
outFeat.setGeometry( QgsGeometry.fromPolygon( polyGeom ) )
atMap = inFeat.attributeMap()
outFeat.setAttributeMap( atMap )
writer.addFeature( outFeat )
del writer
return True
def export_geometry_info( self ):
ellips = None
crs = None
coordTransform = None
# calculate with:
# 0 - layer CRS
# 1 - project CRS
# 2 - ellipsoidal
if self.myCalcType == 2:
settings = QSettings()
ellips = settings.value( "/qgis/measure/ellipsoid", "WGS84" ).toString()
crs = self.vlayer.crs().srsid()
elif self.myCalcType == 1:
mapCRS = self.parent.iface.mapCanvas().mapRenderer().destinationCrs()
layCRS = self.vlayer.crs()
coordTransform = QgsCoordinateTransform( layCRS, mapCRS )
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
nElement = 0
vprovider = self.vlayer.dataProvider()
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0)
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, vprovider.featureCount() ) )
if self.writeShape:
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
( fields, index1, index2 ) = self.checkGeometryFields( self.vlayer )
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
vprovider.geometryType(), vprovider.crs() )
while vprovider.nextFeature(inFeat):
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
nElement += 1
inGeom = inFeat.geometry()
if self.myCalcType == 1:
inGeom.transform( coordTransform )
( attr1, attr2 ) = self.simpleMeasure( inGeom, self.myCalcType, ellips, crs )
outFeat.setGeometry( inGeom )
atMap = inFeat.attributeMap()
outFeat.setAttributeMap( atMap )
outFeat.addAttribute( index1, QVariant( attr1 ) )
outFeat.addAttribute( index2, QVariant( attr2 ) )
writer.addFeature( outFeat )
del writer
return True
else: # update existing file
newFields = []
geomType = self.vlayer.geometryType()
( index1, index2 ) = self.findOrCreateFields()
while vprovider.nextFeature(inFeat):
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
nElement += 1
inGeom = inFeat.geometry()
if self.myCalcType == 1:
inGeom.transform( coordTransform )
( attr1, attr2 ) = self.simpleMeasure( inGeom, self.myCalcType, ellips, crs )
changeMap = {}
changeAttributeMap = { index1 : QVariant( attr1 ),
index2 : QVariant( attr2 ) }
changeMap[ inFeat.id() ] = changeAttributeMap
vprovider.changeAttributeValues( changeMap )
return True
def polygon_centroids( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = vprovider.fields()
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPoint, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
nFeat = vprovider.featureCount()
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
while vprovider.nextFeature( inFeat ):
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
inGeom = inFeat.geometry()
atMap = inFeat.attributeMap()
outGeom = QgsGeometry( inGeom.centroid() )
if outGeom is None:
return "math_error"
outFeat.setAttributeMap( atMap )
outFeat.setGeometry( outGeom )
writer.addFeature( outFeat )
del writer
return True
def delaunay_triangulation( self ):
import voronoi
from sets import Set
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
fields = { 0 : QgsField( "POINTA", QVariant.Double ),
1 : QgsField( "POINTB", QVariant.Double ),
2 : QgsField( "POINTC", QVariant.Double ) }
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPolygon, vprovider.crs() )
inFeat = QgsFeature()
c = voronoi.Context()
pts = []
ptDict = {}
ptNdx = -1
while vprovider.nextFeature( inFeat ):
geom = QgsGeometry( inFeat.geometry() )
point = geom.asPoint()
x = point.x()
y = point.y()
pts.append( ( x, y ) )
ptNdx +=1
ptDict[ptNdx] = inFeat.id()
if len(pts) < 3:
return False
uniqueSet = Set( item for item in pts )
ids = [ pts.index( item ) for item in uniqueSet ]
sl = voronoi.SiteList( [ voronoi.Site( *i ) for i in uniqueSet ] )
c.triangulate = True
voronoi.voronoi( sl, c )
triangles = c.triangles
feat = QgsFeature()
nFeat = len( triangles )
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
for triangle in triangles:
indicies = list( triangle )
indicies.append( indicies[ 0 ] )
polygon = []
step = 0
for index in indicies:
vprovider.featureAtId( ptDict[ ids[ index ] ], inFeat, True, allAttrs )
geom = QgsGeometry( inFeat.geometry() )
point = QgsPoint( geom.asPoint() )
polygon.append( point )
if step <= 3: feat.addAttribute( step, QVariant( ids[ index ] ) )
step += 1
geometry = QgsGeometry().fromPolygon( [ polygon ] )
feat.setGeometry( geometry )
writer.addFeature( feat )
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
del writer
return True
def voronoi_polygons( self ):
vprovider = self.vlayer.dataProvider()
allAttrs = vprovider.attributeIndexes()
vprovider.select( allAttrs )
writer = QgsVectorFileWriter( self.myName, self.myEncoding, vprovider.fields(),
QGis.WKBPolygon, vprovider.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
extent = self.vlayer.extent()
extraX = extent.height() * ( self.myParam / 100.00 )
extraY = extent.width() * ( self.myParam / 100.00 )
height = extent.height()
width = extent.width()
c = voronoi.Context()
pts = []
ptDict = {}
ptNdx = -1
while vprovider.nextFeature( inFeat ):
geom = QgsGeometry( inFeat.geometry() )
point = geom.asPoint()
x = point.x() - extent.xMinimum()
y = point.y() - extent.yMinimum()
pts.append( ( x, y ) )
ptNdx +=1
ptDict[ ptNdx ] = inFeat.id()
self.vlayer = None
if len( pts ) < 3:
return False
uniqueSet = Set( item for item in pts )
ids = [ pts.index( item ) for item in uniqueSet ]
sl = voronoi.SiteList( [ voronoi.Site( i[ 0 ], i[ 1 ], sitenum = j ) for j, i in enumerate( uniqueSet ) ] )
voronoi.voronoi( sl, c )
inFeat = QgsFeature()
nFeat = len( c.polygons )
nElement = 0
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, nFeat ) )
for site, edges in c.polygons.iteritems():
vprovider.featureAtId( ptDict[ ids[ site ] ], inFeat, True, allAttrs )
lines = self.clip_voronoi( edges, c, width, height, extent, extraX, extraY )
geom = QgsGeometry.fromMultiPoint( lines )
geom = QgsGeometry( geom.convexHull() )
outFeat.setGeometry( geom )
outFeat.setAttributeMap( inFeat.attributeMap() )
writer.addFeature( outFeat )
nElement += 1
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
del writer
return True
def clip_voronoi( self, edges, c, width, height, extent, exX, exY ):
""" Clip voronoi function based on code written for Inkscape
Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
"""
def clip_line( x1, y1, x2, y2, w, h, x, y ):
if x1 < 0 - x and x2 < 0 - x:
return [ 0, 0, 0, 0 ]
if x1 > w + x and x2 > w + x:
return [ 0, 0, 0, 0 ]
if x1 < 0 - x:
y1 = ( y1 * x2 - y2 * x1 ) / ( x2 - x1 )
x1 = 0 - x
if x2 < 0 - x:
y2 = ( y1 * x2 - y2 * x1 ) / ( x2 - x1 )
x2 = 0 - x
if x1 > w + x:
y1 = y1 + ( w + x - x1 ) * ( y2 - y1 ) / ( x2 - x1 )
x1 = w + x
if x2 > w + x:
y2 = y1 + ( w + x - x1 ) *( y2 - y1 ) / ( x2 - x1 )
x2 = w + x
if y1 < 0 - y and y2 < 0 - y:
return [ 0, 0, 0, 0 ]
if y1 > h + y and y2 > h + y:
return [ 0, 0, 0, 0 ]
if x1 == x2 and y1 == y2:
return [ 0, 0, 0, 0 ]
if y1 < 0 - y:
x1 = ( x1 * y2 - x2 * y1 ) / ( y2 - y1 )
y1 = 0 - y
if y2 < 0 - y:
x2 = ( x1 * y2 - x2 * y1 ) / ( y2 - y1 )
y2 = 0 - y
if y1 > h + y:
x1 = x1 + ( h + y - y1 ) * ( x2 - x1 ) / ( y2 - y1 )
y1 = h + y
if y2 > h + y:
x2 = x1 + ( h + y - y1) * ( x2 - x1 ) / ( y2 - y1 )
y2 = h + y
return [ x1, y1, x2, y2 ]
lines = []
hasXMin = False
hasYMin = False
hasXMax = False
hasYMax = False
for edge in edges:
if edge[ 1 ] >= 0 and edge[ 2 ] >= 0: # two vertices
[ x1, y1, x2, y2 ] = clip_line( c.vertices[ edge[ 1 ] ][ 0 ], c.vertices[ edge[ 1 ] ][ 1 ], c.vertices[ edge[ 2 ] ][ 0 ], c.vertices[ edge[ 2 ] ][ 1 ], width, height, exX, exY )
elif edge[ 1 ] >= 0: # only one vertex
if c.lines[ edge[ 0 ] ][ 1 ] == 0: # vertical line
xtemp = c.lines[ edge[ 0 ] ][ 2 ] / c.lines[ edge[ 0 ] ][ 0 ]
if c.vertices[ edge[ 1 ] ][ 1 ] > ( height + exY ) / 2:
ytemp = height + exY
else:
ytemp = 0 - exX
else:
xtemp = width + exX
ytemp = ( c.lines[ edge[ 0 ] ][ 2 ] - ( width + exX ) * c.lines[ edge[ 0 ] ][ 0 ] ) / c.lines[ edge[ 0 ] ][ 1 ]
[ x1, y1, x2, y2 ] = clip_line( c.vertices[ edge[ 1 ] ][ 0 ], c.vertices[ edge[ 1 ] ][ 1 ], xtemp, ytemp, width, height, exX, exY )
elif edge[ 2 ] >= 0: # only one vertex
if c.lines[ edge[ 0 ] ][ 1 ] == 0: # vertical line
xtemp = c.lines[ edge[ 0 ] ][ 2 ] / c.lines[ edge[ 0 ] ][ 0 ]
if c.vertices[ edge[ 2 ] ][ 1 ] > ( height + exY ) / 2:
ytemp = height + exY
else:
ytemp = 0.0 - exY
else:
xtemp = 0.0 - exX
ytemp = c.lines[ edge[ 0 ] ][ 2 ] / c.lines[ edge[ 0 ] ][ 1 ]
[ x1, y1, x2, y2 ] = clip_line( xtemp, ytemp, c.vertices[ edge[ 2 ] ][ 0 ], c.vertices[ edge[ 2 ] ][ 1 ], width, height, exX, exY )
if x1 or x2 or y1 or y2:
lines.append( QgsPoint( x1 + extent.xMinimum(), y1 + extent.yMinimum() ) )
lines.append( QgsPoint( x2 + extent.xMinimum(), y2 + extent.yMinimum() ) )
if 0 - exX in ( x1, x2 ):
hasXMin = True
if 0 - exY in ( y1, y2 ):
hasYMin = True
if height + exY in ( y1, y2 ):
hasYMax = True
if width + exX in ( x1, x2 ):
hasXMax = True
if hasXMin:
if hasYMax:
lines.append( QgsPoint( extent.xMinimum() - exX, height + extent.yMinimum() + exY ) )
if hasYMin:
lines.append( QgsPoint( extent.xMinimum() - exX, extent.yMinimum() - exY ) )
if hasXMax:
if hasYMax:
lines.append( QgsPoint( width + extent.xMinimum() + exX, height + extent.yMinimum() + exY ) )
if hasYMin:
lines.append( QgsPoint( width + extent.xMinimum() + exX, extent.yMinimum() - exY ) )
return lines
def layer_extent( self ):
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, 0 ) )
fields = { 0 : QgsField( "MINX", QVariant.Double ),
1 : QgsField( "MINY", QVariant.Double ),
2 : QgsField( "MAXX", QVariant.Double ),
3 : QgsField( "MAXY", QVariant.Double ),
4 : QgsField( "CNTX", QVariant.Double ),
5 : QgsField( "CNTY", QVariant.Double ),
6 : QgsField( "AREA", QVariant.Double ),
7 : QgsField( "PERIM", QVariant.Double ),
8 : QgsField( "HEIGHT", QVariant.Double ),
9 : QgsField( "WIDTH", QVariant.Double ) }
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPolygon, self.vlayer.crs() )
rect = self.vlayer.extent()
minx = rect.xMinimum()
miny = rect.yMinimum()
maxx = rect.xMaximum()
maxy = rect.yMaximum()
height = rect.height()
width = rect.width()
cntx = minx + ( width / 2.0 )
cnty = miny + ( height / 2.0 )
area = width * height
perim = ( 2 * width ) + (2 * height )
rect = [ QgsPoint( minx, miny ),
QgsPoint( minx, maxy ),
QgsPoint( maxx, maxy ),
QgsPoint( maxx, miny ),
QgsPoint( minx, miny ) ]
geometry = QgsGeometry().fromPolygon( [ rect ] )
feat = QgsFeature()
feat.setGeometry( geometry )
feat.setAttributeMap( { 0 : QVariant( minx ),
1 : QVariant( miny ),
2 : QVariant( maxx ),
3 : QVariant( maxy ),
4 : QVariant( cntx ),
5 : QVariant( cnty ),
6 : QVariant( area ),
7 : QVariant( perim ),
8 : QVariant( height ),
9 : QVariant( width ) } )
writer.addFeature( feat )
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, 100 ) )
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
del writer
return True
def feature_extent( self, ):
vprovider = self.vlayer.dataProvider()
vprovider.select( [] )
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), 0 )
fields = { 0 : QgsField( "MINX", QVariant.Double ),
1 : QgsField( "MINY", QVariant.Double ),
2 : QgsField( "MAXX", QVariant.Double ),
3 : QgsField( "MAXY", QVariant.Double ),
4 : QgsField( "CNTX", QVariant.Double ),
5 : QgsField( "CNTY", QVariant.Double ),
6 : QgsField( "AREA", QVariant.Double ),
7 : QgsField( "PERIM", QVariant.Double ),
8 : QgsField( "HEIGHT", QVariant.Double ),
9 : QgsField( "WIDTH", QVariant.Double ) }
writer = QgsVectorFileWriter( self.myName, self.myEncoding, fields,
QGis.WKBPolygon, self.vlayer.crs() )
inFeat = QgsFeature()
outFeat = QgsFeature()
nElement = 0
if self.useSelection:
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), (0, self.vlayer.selectedFeatureCount() ) )
for inFeat in self.vlayer.selectedFeatures():
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
nElement += 1
rect = inFeat.geometry().boundingBox()
minx = rect.xMinimum()
miny = rect.yMinimum()
maxx = rect.xMaximum()
maxy = rect.yMaximum()
height = rect.height()
width = rect.width()
cntx = minx + ( width / 2.0 )
cnty = miny + ( height / 2.0 )
area = width * height
perim = ( 2 * width ) + ( 2 * height )
rect = [ QgsPoint( minx, miny ),
QgsPoint( minx, maxy ),
QgsPoint( maxx, maxy ),
QgsPoint( maxx, miny ),
QgsPoint( minx, miny ) ]
geometry = QgsGeometry().fromPolygon( [ rect ] )
outFeat.setGeometry( geometry )
outFeat.setAttributeMap( { 0 : QVariant( minx ),
1 : QVariant( miny ),
2 : QVariant( maxx ),
3 : QVariant( maxy ),
4 : QVariant( cntx ),
5 : QVariant( cnty ),
6 : QVariant( area ),
7 : QVariant( perim ),
8 : QVariant( height ),
9 : QVariant( width ) } )
writer.addFeature( outFeat )
else:
self.emit( SIGNAL( "runRange( PyQt_PyObject )" ), ( 0, vprovider.featureCount() ) )
while vprovider.nextFeature( inFeat ):
self.emit( SIGNAL( "runStatus( PyQt_PyObject )" ), nElement )
nElement += 1
rect = inFeat.geometry().boundingBox()
minx = rect.xMinimum()
miny = rect.yMinimum()
maxx = rect.xMaximum()
maxy = rect.yMaximum()
height = rect.height()
width = rect.width()
cntx = minx + ( width / 2.0 )
cnty = miny + ( height / 2.0 )
area = width * height
perim = ( 2 * width ) + ( 2 * height )
rect = [ QgsPoint( minx, miny ),
QgsPoint( minx, maxy ),
QgsPoint( maxx, maxy ),
QgsPoint( maxx, miny ),
QgsPoint( minx, miny ) ]
geometry = QgsGeometry().fromPolygon( [ rect ] )
outFeat.setGeometry( geometry )
outFeat.setAttributeMap( { 0 : QVariant( minx ),
1 : QVariant( miny ),
2 : QVariant( maxx ),
3 : QVariant( maxy ),
4 : QVariant( cntx ),
5 : QVariant( cnty ),
6 : QVariant( area ),
7 : QVariant( perim ),
8 : QVariant( height ),
9 : QVariant( width ) } )
writer.addFeature( outFeat )
del writer
return True
def simpleMeasure( self, inGeom, calcType, ellips, crs ):
if inGeom.wkbType() in ( QGis.WKBPoint, QGis.WKBPoint25D ):
pt = QgsPoint()
pt = inGeom.asPoint()
attr1 = pt.x()
attr2 = pt.y()
else:
measure = QgsDistanceArea()
if calcType == 2:
measure.setSourceCrs( crs )
measure.setEllipsoid( ellips )
measure.setProjectionsEnabled( True )
attr1 = measure.measure( inGeom )
if inGeom.type() == QGis.Polygon:
attr2 = self.perimMeasure( inGeom, measure )
else:
attr2 = attr1
return ( attr1, attr2 )
def perimMeasure( self, inGeom, measure ):
value = 0.00
if inGeom.isMultipart():
poly = inGeom.asMultiPolygon()
for k in poly: