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127 lines
5.1 KiB
Python
127 lines
5.1 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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__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.PyQt.QtCore import QVariant
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from qgis.core import (QgsGeometry,
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QgsFeatureSink,
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QgsFeatureRequest,
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QgsFeature,
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QgsField,
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QgsProcessing,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterString,
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QgsSpatialIndex)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class PointsInPolygon(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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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'sum_points.png'))
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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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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.POLYGONS,
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self.tr('Polygons'), [QgsProcessing.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterFeatureSource(self.POINTS,
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self.tr('Points'), [QgsProcessing.TypeVectorPoint]))
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self.addParameter(QgsProcessingParameterString(self.FIELD,
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self.tr('Count field name'), defaultValue='NUMPOINTS'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Count'), QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'countpointsinpolygon'
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def displayName(self):
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return self.tr('Count points in polygon')
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def processAlgorithm(self, parameters, context, feedback):
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poly_source = self.parameterAsSource(parameters, self.POLYGONS, context)
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point_source = self.parameterAsSource(parameters, self.POINTS, context)
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field_name = self.parameterAsString(parameters, self.FIELD, context)
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fields = poly_source.fields()
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if fields.lookupField(field_name) < 0:
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fields.append(QgsField(field_name, QVariant.Int))
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field_index = fields.lookupField(field_name)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, poly_source.wkbType(), poly_source.sourceCrs())
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spatialIndex = QgsSpatialIndex(point_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs())))
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features = poly_source.getFeatures()
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total = 100.0 / poly_source.featureCount() if poly_source.featureCount() else 0
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for current, polygon_feature in enumerate(features):
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count = 0
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output_feature = QgsFeature()
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if polygon_feature.hasGeometry():
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geom = polygon_feature.geometry()
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engine = QgsGeometry.createGeometryEngine(geom.geometry())
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engine.prepareGeometry()
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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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request = QgsFeatureRequest().setFilterFids(points).setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs())
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for point_feature in point_source.getFeatures(request):
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if engine.contains(point_feature.geometry().geometry()):
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count += 1
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output_feature.setGeometry(geom)
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attrs = polygon_feature.attributes()
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if field_index == len(attrs):
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attrs.append(count)
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else:
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attrs[field_index] = count
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output_feature.setAttributes(attrs)
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sink.addFeature(output_feature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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