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377b181c4e
Also - simplify and add tests - remove large memory leak (persistant store of all non-project layers) - remove broken support for direct loading postgres/virtual layers by string (Python version was very broken and would never match a postgres/virtual layer)
141 lines
5.5 KiB
Python
141 lines
5.5 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 builtins import str
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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 qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsApplication,
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QgsField,
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QgsFeatureRequest,
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QgsFeature,
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QgsGeometry)
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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.parameters import ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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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 QIcon(os.path.dirname(__file__) + "/icons/sum_points.png")
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# =========================================================================
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector analysis tools')
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def name(self):
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return 'countpointsinpolygonweighted'
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def displayName(self):
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return self.tr('Count points in polygon(weighted)')
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def defineCharacteristics(self):
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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(ParameterVector(self.POINTS,
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self.tr('Points'), [dataobjects.TYPE_VECTOR_POINT]))
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self.addParameter(ParameterTableField(self.WEIGHT,
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self.tr('Weight field'), self.POINTS))
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self.addParameter(ParameterString(self.FIELD,
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self.tr('Count field name'), 'NUMPOINTS'))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Weighted count'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, feedback):
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polyLayer = dataobjects.getLayerFromString(self.getParameterValue(self.POLYGONS))
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pointLayer = dataobjects.getLayerFromString(self.getParameterValue(self.POINTS))
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fieldName = self.getParameterValue(self.FIELD)
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fieldIdx = pointLayer.fields().lookupField(self.getParameterValue(self.WEIGHT))
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fields = polyLayer.fields()
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fields.append(QgsField(fieldName, QVariant.Int))
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(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
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polyLayer.fields(), fieldName)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields.toList(), polyLayer.wkbType(), polyLayer.crs())
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spatialIndex = vector.spatialindex(pointLayer)
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ftPoint = QgsFeature()
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outFeat = QgsFeature()
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geom = QgsGeometry()
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features = vector.features(polyLayer)
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total = 100.0 / len(features)
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for current, ftPoly in enumerate(features):
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geom = ftPoly.geometry()
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engine = QgsGeometry.createGeometryEngine(geom.geometry())
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engine.prepareGeometry()
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attrs = ftPoly.attributes()
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count = 0
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points = spatialIndex.intersects(geom.boundingBox())
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if len(points) > 0:
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feedback.setProgressText(str(len(points)))
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request = QgsFeatureRequest().setFilterFids(points).setSubsetOfAttributes([fieldIdx])
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fit = pointLayer.getFeatures(request)
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ftPoint = QgsFeature()
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while fit.nextFeature(ftPoint):
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tmpGeom = QgsGeometry(ftPoint.geometry())
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if engine.contains(tmpGeom.geometry()):
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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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# Ignore fields with non-numeric values
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pass
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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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feedback.setProgress(int(current * total))
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del writer
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