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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 *
import ftools_utils
from qgis.core import *
from ui_frmSumLines import Ui_Dialog
class Dialog(QDialog, Ui_Dialog):
def __init__(self, iface):
QDialog.__init__(self, iface.mainWindow())
self.iface = iface
# Set up the user interface from Designer.
self.setupUi(self)
QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile)
self.setWindowTitle(self.tr("Sum line lengths"))
self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok )
self.progressBar.setValue(0)
self.populateLayers()
def populateLayers( self ):
layers = ftools_utils.getLayerNames([QGis.Line])
self.inPoint.clear()
self.inPoint.addItems(layers)
layers = ftools_utils.getLayerNames([QGis.Polygon])
self.inPolygon.clear()
self.inPolygon.addItems(layers)
def accept(self):
self.buttonOk.setEnabled( False )
if self.inPolygon.currentText() == "":
QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify input polygon vector layer"))
elif self.outShape.text() == "":
QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify output shapefile"))
elif self.inPoint.currentText() == "":
QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify input line vector layer"))
elif self.lnField.text() == "":
QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify output length field"))
else:
inPoly = self.inPolygon.currentText()
inLns = self.inPoint.currentText()
inField = self.lnField.text()
outPath = self.outShape.text()
outName = ftools_utils.getShapefileName( outPath )
self.compute(inPoly, inLns, inField, outPath, self.progressBar)
self.outShape.clear()
if self.addToCanvasCheck.isChecked():
addCanvasCheck = ftools_utils.addShapeToCanvas(unicode(outPath))
if not addCanvasCheck:
QMessageBox.warning( self, self.tr("Sum line lengths"), self.tr( "Error loading output shapefile:\n%s" ) % ( unicode( outPath ) ))
self.populateLayers()
else:
QMessageBox.information(self, self.tr("Sum line lengths"),self.tr("Created output shapefile:\n%s" ) % ( unicode( outPath )))
self.progressBar.setValue(0)
self.buttonOk.setEnabled( True )
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( self.shapefileName )
def compute(self, inPoly, inLns, inField, outPath, progressBar):
polyLayer = ftools_utils.getVectorLayerByName(inPoly)
lineLayer = ftools_utils.getVectorLayerByName(inLns)
polyProvider = polyLayer.dataProvider()
lineProvider = lineLayer.dataProvider()
if polyProvider.crs() <> lineProvider.crs():
QMessageBox.warning(self, self.tr("CRS warning!"), self.tr("Warning: Input layers have non-matching CRS.\nThis may cause unexpected results."))
fieldList = ftools_utils.getFieldList(polyLayer)
index = polyProvider.fieldNameIndex(unicode(inField))
if index == -1:
index = polyProvider.fields().count()
fieldList.append( QgsField(unicode(inField), QVariant.Double, "real", 24, 15, self.tr("length field")) )
sRs = polyProvider.crs()
inFeat = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
distArea = QgsDistanceArea()
start = 0.00
add = 100.00 / polyProvider.featureCount()
check = QFile(self.shapefileName)
if check.exists():
if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
return
writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fieldList, polyProvider.geometryType(), sRs)
spatialIndex = ftools_utils.createIndex( lineProvider )
polyFit = polyProvider.getFeatures()
while polyFit.nextFeature(inFeat):
inGeom = QgsGeometry(inFeat.geometry())
atMap = inFeat.attributes()
lineList = []
length = 0
lineList = spatialIndex.intersects(inGeom.boundingBox())
if len(lineList) > 0: check = 0
else: check = 1
if check == 0:
for i in lineList:
lineProvider.getFeatures( QgsFeatureRequest().setFilterFid( int(i) ) ).nextFeature( inFeatB )
tmpGeom = QgsGeometry( inFeatB.geometry() )
if inGeom.intersects(tmpGeom):
outGeom = inGeom.intersection(tmpGeom)
length = length + distArea.measure(outGeom)
outFeat.setGeometry(inGeom)
atMap.append(length)
outFeat.setAttributes(atMap)
writer.addFeature(outFeat)
start = start + 1
progressBar.setValue( start * (add))
del writer
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