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158 lines
6.5 KiB
Python
158 lines
6.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SumLines.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 (QgsFeature,
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QgsFeatureSink,
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QgsField,
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QgsGeometry,
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QgsFeatureRequest,
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QgsDistanceArea,
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QgsProject,
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QgsProcessing,
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QgsProcessingParameterString,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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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 SumLines(QgisAlgorithm):
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LINES = 'LINES'
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POLYGONS = 'POLYGONS'
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LEN_FIELD = 'LEN_FIELD'
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COUNT_FIELD = 'COUNT_FIELD'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'sum_lines.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.LINES,
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self.tr('Lines'), [QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterFeatureSource(self.POLYGONS,
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self.tr('Polygons'), [QgsProcessing.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterString(self.LEN_FIELD,
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self.tr('Lines length field name'), defaultValue='LENGTH'))
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self.addParameter(QgsProcessingParameterString(self.COUNT_FIELD,
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self.tr('Lines count field name'), defaultValue='COUNT'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Line length'), QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'sumlinelengths'
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def displayName(self):
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return self.tr('Sum line lengths')
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def processAlgorithm(self, parameters, context, feedback):
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line_source = self.parameterAsSource(parameters, self.LINES, context)
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poly_source = self.parameterAsSource(parameters, self.POLYGONS, context)
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length_field_name = self.parameterAsString(parameters, self.LEN_FIELD, context)
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count_field_name = self.parameterAsString(parameters, self.COUNT_FIELD, context)
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fields = poly_source.fields()
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if fields.lookupField(length_field_name) < 0:
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fields.append(QgsField(length_field_name, QVariant.Double))
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length_field_index = fields.lookupField(length_field_name)
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if fields.lookupField(count_field_name) < 0:
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fields.append(QgsField(count_field_name, QVariant.Int))
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count_field_index = fields.lookupField(count_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(line_source.getFeatures(
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QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs())), feedback)
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distArea = QgsDistanceArea()
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distArea.setSourceCrs(poly_source.sourceCrs())
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distArea.setEllipsoid(context.project().ellipsoid())
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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, poly_feature in enumerate(features):
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if feedback.isCanceled():
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break
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output_feature = QgsFeature()
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count = 0
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length = 0
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if poly_feature.hasGeometry():
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poly_geom = poly_feature.geometry()
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has_intersections = False
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lines = spatialIndex.intersects(poly_geom.boundingBox())
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engine = None
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if len(lines) > 0:
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has_intersections = True
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(poly_geom.geometry())
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engine.prepareGeometry()
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if has_intersections:
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request = QgsFeatureRequest().setFilterFids(lines).setSubsetOfAttributes([]).setDestinationCrs(poly_source.sourceCrs())
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for line_feature in line_source.getFeatures(request):
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if feedback.isCanceled():
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break
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if engine.intersects(line_feature.geometry().geometry()):
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outGeom = poly_geom.intersection(line_feature.geometry())
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length += distArea.measureLength(outGeom)
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count += 1
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output_feature.setGeometry(poly_geom)
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attrs = poly_feature.attributes()
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if length_field_index == len(attrs):
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attrs.append(length)
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else:
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attrs[length_field_index] = length
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if count_field_index == len(attrs):
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attrs.append(count)
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else:
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attrs[count_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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