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111 lines
4.0 KiB
Python
111 lines
4.0 KiB
Python
import os.path
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from PyQt4 import QtGui
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from PyQt4.QtCore import *
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from qgis.core import *
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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from sextante.core.QGisLayers import QGisLayers
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from sextante.core.SextanteLog import SextanteLog
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.parameters.ParameterString import ParameterString
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from sextante.outputs.OutputVector import OutputVector
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from sextante.ftools import FToolsUtils as utils
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class SumLines(GeoAlgorithm):
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LINES = "LINES"
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POLYGONS = "POLYGONS"
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LEN_FIELD = "LEN_FIELD"
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COUNT_FIELD = "COUNT_FIELD"
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OUTPUT = "OUTPUT"
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def getIcon(self):
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return QtGui.QIcon(os.path.dirname(__file__) + "/icons/sum_lines.png")
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def defineCharacteristics(self):
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self.name = "Sum line lengths"
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self.group = "Analysis tools"
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self.addParameter(ParameterVector(self.LINES, "Lines", ParameterVector.VECTOR_TYPE_LINE))
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self.addParameter(ParameterVector(self.POLYGONS, "Polygons", ParameterVector.VECTOR_TYPE_POLYGON))
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self.addParameter(ParameterString(self.LEN_FIELD, "Lines length field name", "LENGTH"))
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self.addParameter(ParameterString(self.COUNT_FIELD, "Lines count field name", "COUNT"))
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self.addOutput(OutputVector(self.OUTPUT, "Result"))
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def processAlgorithm(self, progress):
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settings = QSettings()
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encoding = settings.value( "/UI/encoding", "System" ).toString()
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lineLayer = QGisLayers.getObjectFromUri(self.getParameterValue(self.LINES))
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polyLayer = QGisLayers.getObjectFromUri(self.getParameterValue(self.POLYGONS))
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lengthFieldName = self.getParameterValue(self.LEN_FIELD)
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countFieldName = self.getParameterValue(self.COUNT_FIELD)
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output = self.getOutputValue(self.OUTPUT)
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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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SextanteLog.addToLog(SextanteLog.LOG_WARNING,
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"CRS warning: Input layers have non-matching CRS. This may cause unexpected results.")
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idxLength, fieldList = utils.findOrCreateField(polyLayer, polyLayer.pendingFields(), lengthFieldName)
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idxCount, fieldList = utils.findOrCreateField(polyLayer, fieldList, countFieldName)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList,
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polyProvider.geometryType(), polyProvider.crs())
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spatialIndex = utils.createSpatialIndex(lineProvider)
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lineProvider.rewind()
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lineProvider.select()
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allAttrs = polyLayer.pendingAllAttributesList()
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polyLayer.select(allAttrs)
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ftLine = QgsFeature()
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ftPoly = 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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current = 0
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total = 100.0 / float(polyProvider.featureCount())
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hasIntersections = False
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while polyLayer.nextFeature(ftPoly):
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inGeom = QgsGeometry(ftPoly.geometry())
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atMap = ftPoly.attributeMap()
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count = 0
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length = 0
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hasIntersections = False
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lines = spatialIndex.intersects(inGeom.boundingBox())
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if len(lines) > 0:
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hasIntersections = True
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if hasIntersections:
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for i in lines:
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lineProvider.featureAtId(int(i), ftLine)
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tmpGeom = QgsGeometry(ftLine.geometry())
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if inGeom.intersects(tmpGeom):
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outGeom = inGeom.intersection(tmpGeom)
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length += distArea.measure(outGeom)
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count += 1
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outFeat.setGeometry(inGeom)
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outFeat.setAttributeMap(atMap)
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outFeat.addAttribute(idxLength, QVariant(length))
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outFeat.addAttribute(idxCount, QVariant(count))
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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