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125 lines
4.7 KiB
Python
125 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsInPolygon.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 sextante.parameters.ParameterTableField import ParameterTableField
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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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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.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.algs.ftools import FToolsUtils as utils
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class PointsInPolygonWeighted(GeoAlgorithm):
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POLYGONS = "POLYGONS"
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POINTS = "POINTS"
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OUTPUT = "OUTPUT"
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FIELD = "FIELD"
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WEIGHT = "WEIGHT"
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#===========================================================================
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# def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/sum_points.png")
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#===========================================================================
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def defineCharacteristics(self):
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self.name = "Count points in polygon(weighted)"
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self.group = "Vector analysis tools"
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self.addParameter(ParameterVector(self.POLYGONS, "Polygons", ParameterVector.VECTOR_TYPE_POLYGON))
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self.addParameter(ParameterVector(self.POINTS, "Points", ParameterVector.VECTOR_TYPE_POINT))
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self.addParameter(ParameterTableField(self.WEIGHT, "Weight field", self.POINTS))
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self.addParameter(ParameterString(self.FIELD, "Count field name", "NUMPOINTS"))
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self.addOutput(OutputVector(self.OUTPUT, "Result"))
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def processAlgorithm(self, progress):
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polyLayer = QGisLayers.getObjectFromUri(self.getParameterValue(self.POLYGONS))
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pointLayer = QGisLayers.getObjectFromUri(self.getParameterValue(self.POINTS))
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fieldName = self.getParameterValue(self.FIELD)
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fieldIdx = pointLayer.fieldNameIndex(self.getParameterValue(self.WEIGHT))
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polyProvider = polyLayer.dataProvider()
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idxCount, fieldList = utils.findOrCreateField(polyLayer, polyLayer.pendingFields(), fieldName)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList.toList(),
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polyProvider.geometryType(), polyProvider.crs())
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spatialIndex = utils.createSpatialIndex(pointLayer)
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ftPoint = QgsFeature()
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outFeat = QgsFeature()
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geom = QgsGeometry()
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current = 0
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hasIntersections = False
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features = QGisLayers.features(polyLayer)
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total = 100.0 / float(len(features))
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for ftPoly in features:
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geom = ftPoly.geometry()
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attrs = ftPoly.attributes()
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count = 0
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hasIntersections = False
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points = spatialIndex.intersects(geom.boundingBox())
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if len(points) > 0:
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hasIntersections = True
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if hasIntersections:
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progress.setText(str(len(points)))
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for i in points:
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request = QgsFeatureRequest().setFilterFid(i)
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ftPoint = pointLayer.getFeatures(request).next()
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tmpGeom = QgsGeometry(ftPoint.geometry())
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if geom.contains(tmpGeom):
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weight = str(ftPoint.attributes()[fieldIdx])
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try:
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count += float(weight)
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except:
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pass #ignore fields with non-numeric values
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outFeat.setGeometry(geom)
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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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current += 1
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progress.setPercentage(int(current * total))
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del writer
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