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https://github.com/qgis/QGIS.git
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24ba0309ff
1) All fTools functions should now add all layers to dropdowns (including non-visible layers), 2) All fTools functions should now be non-modal 3) Several fTools functions have been spead up slightly 4) Where possible, internal (cpp) functions have be used to replace older Python functions 5) Defining projections now also considers .qpj files Fixes bugs #2502 and #2506, and possibly others? git-svn-id: http://svn.osgeo.org/qgis/trunk@13037 c8812cc2-4d05-0410-92ff-de0c093fc19c
151 lines
7.0 KiB
Python
Executable File
151 lines
7.0 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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#-----------------------------------------------------------
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#
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# Sum Lines In Polygons
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#
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# A QGIS plugin for calculating the total sum of line
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# lengths in each polygon of an input vector polygon layer.
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#
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# Copyright (C) 2008 Carson Farmer
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#
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# EMAIL: carson.farmer (at) gmail.com
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# WEB : www.geog.uvic.ca/spar/carson
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#
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#-----------------------------------------------------------
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#
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# licensed under the terms of GNU GPL 2
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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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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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#---------------------------------------------------------------------
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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import ftools_utils
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from qgis.core import *
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from ui_frmSumLines import Ui_Dialog
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class Dialog(QDialog, Ui_Dialog):
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def __init__(self, iface):
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QDialog.__init__(self)
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self.iface = iface
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# Set up the user interface from Designer.
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self.setupUi(self)
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QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile)
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self.setWindowTitle(self.tr("Sum line lengths"))
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# populate layer list
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self.progressBar.setValue(0)
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mapCanvas = self.iface.mapCanvas()
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layers = ftools_utils.getLayerNames([QGis.Line])
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self.inPoint.addItems(layers)
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layers = ftools_utils.getLayerNames([QGis.Polygon])
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self.inPolygon.addItems(layers)
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def accept(self):
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if self.inPolygon.currentText() == "":
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QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify input polygon vector layer"))
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elif self.outShape.text() == "":
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QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify output shapefile"))
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elif self.inPoint.currentText() == "":
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QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify input line vector layer"))
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elif self.lnField.text() == "":
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QMessageBox.information(self, self.tr("Sum Line Lengths In Polyons"), self.tr("Please specify output length field"))
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else:
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inPoly = self.inPolygon.currentText()
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inLns = self.inPoint.currentText()
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inField = self.lnField.text()
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outPath = self.outShape.text()
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if outPath.contains("\\"):
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outName = outPath.right((outPath.length() - outPath.lastIndexOf("\\")) - 1)
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else:
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outName = outPath.right((outPath.length() - outPath.lastIndexOf("/")) - 1)
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if outName.endsWith(".shp"):
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outName = outName.left(outName.length() - 4)
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self.compute(inPoly, inLns, inField, outPath, self.progressBar)
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self.outShape.clear()
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addToTOC = QMessageBox.question(self, self.tr("Sum line lengths"), self.tr("Created output shapefile:\n%1\n\nWould you like to add the new layer to the TOC?").arg(unicode(outPath)), QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton)
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if addToTOC == QMessageBox.Yes:
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self.vlayer = QgsVectorLayer(outPath, unicode(outName), "ogr")
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QgsMapLayerRegistry.instance().addMapLayer(self.vlayer)
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self.progressBar.setValue(0)
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def outFile(self):
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self.outShape.clear()
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( self.shapefileName, self.encoding ) = ftools_utils.saveDialog( self )
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if self.shapefileName is None or self.encoding is None:
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return
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self.outShape.setText( QString( self.shapefileName ) )
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def compute(self, inPoly, inLns, inField, outPath, progressBar):
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polyLayer = ftools_utils.getVectorLayerByName(inPoly)
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lineLayer = ftools_utils.getVectorLayerByName(inLns)
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polyProvider = polyLayer.dataProvider()
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lineProvider = lineLayer.dataProvider()
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if polyProvider.crs() <> lineProvider.crs():
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QMessageBox.warning(self, self.tr("CRS warning!"), self.tr("Warning: Input layers have non-matching CRS.\nThis may cause unexpected results."))
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allAttrs = polyProvider.attributeIndexes()
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polyProvider.select(allAttrs)
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allAttrs = lineProvider.attributeIndexes()
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lineProvider.select(allAttrs)
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fieldList = ftools_utils.getFieldList(polyLayer)
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index = polyProvider.fieldNameIndex(unicode(inField))
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if index == -1:
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index = polyProvider.fieldCount()
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field = QgsField(unicode(inField), QVariant.Double, "real", 24, 15, self.tr("length field"))
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fieldList[index] = field
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sRs = polyProvider.crs()
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inFeat = QgsFeature()
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inFeatB = QgsFeature()
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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outGeom = QgsGeometry()
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distArea = QgsDistanceArea()
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lineProvider.rewind()
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start = 15.00
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add = 85.00 / polyProvider.featureCount()
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check = QFile(self.shapefileName)
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if check.exists():
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if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
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return
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writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fieldList, polyProvider.geometryType(), sRs)
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#writer = QgsVectorFileWriter(outPath, "UTF-8", fieldList, polyProvider.geometryType(), sRs)
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spatialIndex = ftools_utils.createIndex( lineProvider )
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while polyProvider.nextFeature(inFeat):
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inGeom = QgsGeometry(inFeat.geometry())
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atMap = inFeat.attributeMap()
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lineList = []
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length = 0
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#(check, lineList) = lineLayer.featuresInRectangle(inGeom.boundingBox(), True, False)
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#lineLayer.select(inGeom.boundingBox(), False)
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#lineList = lineLayer.selectedFeatures()
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lineList = spatialIndex.intersects(inGeom.boundingBox())
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if len(lineList) > 0: check = 0
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else: check = 1
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if check == 0:
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for i in lineList:
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lineProvider.featureAtId( int( i ), inFeatB , True, allAttrs )
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tmpGeom = QgsGeometry( inFeatB.geometry() )
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if inGeom.intersects(tmpGeom):
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outGeom = inGeom.intersection(tmpGeom)
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length = length + distArea.measure(outGeom)
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outFeat.setGeometry(inGeom)
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outFeat.setAttributeMap(atMap)
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outFeat.addAttribute(index, QVariant(length))
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writer.addFeature(outFeat)
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start = start + 1
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progressBar.setValue(start)
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del writer
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