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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
229 lines
11 KiB
Python
229 lines
11 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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QgsFeatureSink,
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QgsWkbTypes,
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QgsApplication,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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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class GeometryConvert(QgisAlgorithm):
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INPUT = 'INPUT'
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TYPE = 'TYPE'
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OUTPUT = 'OUTPUT'
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def group(self):
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return self.tr('Vector geometry 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.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 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 processAlgorithm(self, parameters, context, feedback):
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layer = 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 / layer.featureCount() if layer.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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elif newType == QgsWkbTypes.LineString:
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writer.addFeature(f, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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elif newType == QgsWkbTypes.MultiLineString:
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writer.addFeature(f, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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elif newType == QgsWkbTypes.Polygon:
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writer.addFeature(f, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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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, QgsFeatureSink.FastInsert)
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elif newType in [QgsWkbTypes.MultiLineString, QgsWkbTypes.MultiPolygon]:
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writer.addFeature(f, QgsFeatureSink.FastInsert)
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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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