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194 lines
8.1 KiB
Python
194 lines
8.1 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 (QgsApplication,
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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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QgsProcessingException,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterString,
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QgsProcessingParameterField,
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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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WEIGHT = 'WEIGHT'
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CLASSFIELD = 'CLASSFIELD'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmSumPoints.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmSumPoints.svg")
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def group(self):
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return self.tr('Vector analysis')
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def groupId(self):
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return 'vectoranalysis'
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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(QgsProcessingParameterField(self.WEIGHT,
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self.tr('Weight field'), parentLayerParameterName=self.POINTS,
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optional=True))
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self.addParameter(QgsProcessingParameterField(self.CLASSFIELD,
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self.tr('Class field'), parentLayerParameterName=self.POINTS,
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optional=True))
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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(
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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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if poly_source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.POLYGONS))
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point_source = self.parameterAsSource(parameters, self.POINTS, context)
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if point_source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.POINTS))
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weight_field = self.parameterAsString(parameters, self.WEIGHT, context)
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weight_field_index = -1
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if weight_field:
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weight_field_index = point_source.fields().lookupField(weight_field)
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class_field = self.parameterAsString(parameters, self.CLASSFIELD, context)
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class_field_index = -1
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if class_field:
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class_field_index = point_source.fields().lookupField(class_field)
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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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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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spatialIndex = QgsSpatialIndex(point_source.getFeatures(
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QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs(), context.transformContext())), feedback)
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point_attribute_indices = []
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if weight_field_index >= 0:
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point_attribute_indices.append(weight_field_index)
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if class_field_index >= 0:
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point_attribute_indices.append(class_field_index)
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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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if feedback.isCanceled():
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break
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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.constGet())
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engine.prepareGeometry()
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count = 0
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classes = set()
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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).setDestinationCrs(poly_source.sourceCrs(), context.transformContext())
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request.setSubsetOfAttributes(point_attribute_indices)
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for point_feature in point_source.getFeatures(request):
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if feedback.isCanceled():
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break
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if engine.contains(point_feature.geometry().constGet()):
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if weight_field_index >= 0:
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weight = point_feature.attributes()[weight_field_index]
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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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elif class_field_index >= 0:
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point_class = point_feature.attributes()[class_field_index]
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if point_class not in classes:
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classes.add(point_class)
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else:
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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 class_field_index >= 0:
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score = len(classes)
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else:
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score = count
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if field_index == len(attrs):
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attrs.append(score)
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else:
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attrs[field_index] = score
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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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