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a05b610a8b
Wherever possible use prepared geometry engines for intersects type tests, as it's much faster
134 lines
5.3 KiB
Python
134 lines
5.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SumLines.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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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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***************************************************************************
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"""
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from builtins import next
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import QgsFeature, QgsGeometry, QgsFeatureRequest, QgsDistanceArea
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterString
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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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 QIcon(os.path.join(pluginPath, 'images', 'ftools', 'sum_lines.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Sum line lengths')
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self.group, self.i18n_group = self.trAlgorithm('Vector analysis tools')
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self.addParameter(ParameterVector(self.LINES,
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self.tr('Lines'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterVector(self.POLYGONS,
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self.tr('Polygons'), [dataobjects.TYPE_VECTOR_POLYGON]))
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self.addParameter(ParameterString(self.LEN_FIELD,
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self.tr('Lines length field name', 'LENGTH')))
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self.addParameter(ParameterString(self.COUNT_FIELD,
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self.tr('Lines count field name', 'COUNT')))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Line length'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, progress):
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lineLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.LINES))
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polyLayer = dataobjects.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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(idxLength, fieldList) = vector.findOrCreateField(polyLayer,
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polyLayer.fields(), lengthFieldName)
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(idxCount, fieldList) = vector.findOrCreateField(polyLayer, fieldList,
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countFieldName)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fieldList.toList(), polyLayer.wkbType(), polyLayer.crs())
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spatialIndex = vector.spatialindex(lineLayer)
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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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features = vector.features(polyLayer)
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total = 100.0 / len(features)
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hasIntersections = False
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for current, ftPoly in enumerate(features):
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inGeom = ftPoly.geometry()
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attrs = ftPoly.attributes()
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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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engine = None
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if len(lines) > 0:
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hasIntersections = True
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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if hasIntersections:
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request = QgsFeatureRequest().setFilterFids(lines).setSubsetOfAttributes([])
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for ftLine in lineLayer.getFeatures(request):
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tmpGeom = ftLine.geometry()
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if engine.intersects(tmpGeom.geometry()):
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outGeom = inGeom.intersection(tmpGeom)
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length += distArea.measureLength(outGeom)
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count += 1
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outFeat.setGeometry(inGeom)
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if idxLength == len(attrs):
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attrs.append(length)
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else:
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attrs[idxLength] = length
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if idxCount == len(attrs):
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attrs.append(count)
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else:
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attrs[idxCount] = count
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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del writer
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