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219 lines
9.9 KiB
Python
219 lines
9.9 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 Qgis, QgsFeature, QgsGeometry, QgsWkbTypes
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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 defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Convert geometry type')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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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, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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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(
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layer.fields(), newType, layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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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 %s to %s', 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 %s to %s', 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 %s to %s', 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 %s to %s', 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 %s to %s', 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 %s to %s', geomType, newType))
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progress.setPercentage(int(current * total))
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del writer
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