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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
233 lines
10 KiB
Python
233 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Gridify.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn 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__ = 'Michael Minn'
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__date__ = 'May 2010'
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__copyright__ = '(C) 2010, Michael Minn'
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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.core import (QgsFeature,
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QgsGeometry,
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QgsWkbTypes,
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QgsApplication,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterSelection
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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 GeometryConvert(GeoAlgorithm):
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INPUT = 'INPUT'
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TYPE = 'TYPE'
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OUTPUT = 'OUTPUT'
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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 geometry tools')
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def name(self):
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return 'convertgeometrytype'
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def displayName(self):
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return self.tr('Convert geometry type')
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def defineCharacteristics(self):
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self.types = [self.tr('Centroids'),
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self.tr('Nodes'),
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self.tr('Linestrings'),
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self.tr('Multilinestrings'),
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self.tr('Polygons')]
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterSelection(self.TYPE,
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self.tr('New geometry type'), self.types))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Converted')))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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index = self.getParameterValue(self.TYPE)
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splitNodes = False
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if index == 0:
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newType = QgsWkbTypes.Point
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elif index == 1:
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newType = QgsWkbTypes.Point
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splitNodes = True
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elif index == 2:
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newType = QgsWkbTypes.LineString
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elif index == 3:
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newType = QgsWkbTypes.MultiLineString
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elif index == 4:
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newType = QgsWkbTypes.Polygon
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else:
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newType = QgsWkbTypes.Point
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.fields(), newType, layer.crs(), context)
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
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for current, f in enumerate(features):
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geom = f.geometry()
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geomType = geom.wkbType()
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if geomType in [QgsWkbTypes.Point, QgsWkbTypes.Point25D]:
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if newType == QgsWkbTypes.Point:
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writer.addFeature(f)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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elif geomType in [QgsWkbTypes.MultiPoint, QgsWkbTypes.MultiPoint25D]:
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if newType == QgsWkbTypes.Point and splitNodes:
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points = geom.asMultiPoint()
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for p in points:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPoint(p))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Point:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(geom.centroid())
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writer.addFeature(feat)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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elif geomType in [QgsWkbTypes.LineString, QgsWkbTypes.LineString25D]:
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if newType == QgsWkbTypes.Point and splitNodes:
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points = geom.asPolyline()
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for p in points:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPoint(p))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Point:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(geom.centroid())
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.LineString:
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writer.addFeature(f)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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elif geomType in [QgsWkbTypes.MultiLineString, QgsWkbTypes.MultiLineString25D]:
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if newType == QgsWkbTypes.Point and splitNodes:
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lines = geom.asMultiPolyline()
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for line in lines:
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for p in line:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPoint(p))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Point:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(geom.centroid())
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.LineString:
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lines = geom.asMultiPolyline()
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for line in lines:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPolyline(line))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.MultiLineString:
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writer.addFeature(f)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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elif geomType in [QgsWkbTypes.Polygon, QgsWkbTypes.Polygon25D]:
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if newType == QgsWkbTypes.Point and splitNodes:
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rings = geom.asPolygon()
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for ring in rings:
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for p in ring:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPoint(p))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Point:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(geom.centroid())
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.MultiLineString:
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rings = geom.asPolygon()
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromMultiPolyline(rings))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Polygon:
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writer.addFeature(f)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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elif geomType in [QgsWkbTypes.MultiPolygon, QgsWkbTypes.MultiPolygon25D]:
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if newType == QgsWkbTypes.Point and splitNodes:
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polygons = geom.asMultiPolygon()
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for polygon in polygons:
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for line in polygon:
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for p in line:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPoint(p))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Point:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(geom.centroid())
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.LineString:
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polygons = geom.asMultiPolygon()
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for polygons in polygons:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPolyline(polygon))
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writer.addFeature(feat)
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elif newType == QgsWkbTypes.Polygon:
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polygons = geom.asMultiPolygon()
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for polygon in polygons:
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(QgsGeometry.fromPolygon(polygon))
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writer.addFeature(feat)
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elif newType in [QgsWkbTypes.MultiLineString, QgsWkbTypes.MultiPolygon]:
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writer.addFeature(f)
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('Cannot convert from {0} to {1}').format(geomType, newType))
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feedback.setProgress(int(current * total))
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del writer
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