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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
133 lines
5.4 KiB
Python
133 lines
5.4 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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QgsFeatureSink,
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QgsFeature,
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QgsGeometry,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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(QgisAlgorithm):
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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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def group(self):
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return self.tr('Vector analysis tools')
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def __init__(self):
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super().__init__()
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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 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 processAlgorithm(self, parameters, context, feedback):
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polyLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POLYGONS), context)
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pointLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POINTS), context)
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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(fields, polyLayer.wkbType(),
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polyLayer.crs(), context)
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spatialIndex = QgsProcessingUtils.createSpatialIndex(pointLayer, context)
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ftPoint = QgsFeature()
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outFeat = QgsFeature()
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geom = QgsGeometry()
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features = QgsProcessingUtils.getFeatures(polyLayer, context)
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total = 100.0 / polyLayer.featureCount() if polyLayer.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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