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LinesToPolygons.py
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LinesToPolygons.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
LinesToPolygons.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
from qgis.PyQt.QtGui import QIcon
from qgis.core import (QgsFeature,
QgsGeometry,
QgsGeometryCollection,
QgsPolygon,
QgsMultiPolygon,
QgsMultiSurface,
QgsWkbTypes,
QgsFeatureSink,
QgsProcessing,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFeatureSink,
QgsProcessingUtils)
from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
from processing.tools import dataobjects, vector
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class LinesToPolygons(QgisFeatureBasedAlgorithm):
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'to_lines.png'))
def tags(self):
return self.tr('line,polygon,convert').split(',')
def group(self):
return self.tr('Vector geometry')
def __init__(self):
super().__init__()
def name(self):
return 'linestopolygons'
def displayName(self):
return self.tr('Lines to polygons')
def outputName(self):
return self.tr('Polygons')
def outputType(self):
return QgsProcessing.TypeVectorPolygon
def inputLayerTypes(self):
return [QgsProcessing.TypeVectorLine]
def outputWkbType(self, input_wkb_type):
return self.convertWkbToPolygons(input_wkb_type)
def processFeature(self, feature, feedback):
if feature.hasGeometry():
feature.setGeometry(QgsGeometry(self.convertToPolygons(feature.geometry())))
if feature.geometry().isEmpty():
feedback.reportError(self.tr("One or more line ignored due to geometry not having a minimum of three vertices."))
return feature
def convertWkbToPolygons(self, wkb):
multi_wkb = None
if QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.LineString:
multi_wkb = QgsWkbTypes.MultiPolygon
elif QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.CompoundCurve:
multi_wkb = QgsWkbTypes.MultiSurface
if QgsWkbTypes.hasM(wkb):
multi_wkb = QgsWkbTypes.addM(multi_wkb)
if QgsWkbTypes.hasZ(wkb):
multi_wkb = QgsWkbTypes.addZ(multi_wkb)
return multi_wkb
def convertToPolygons(self, geometry):
surfaces = self.getSurfaces(geometry.constGet())
output_wkb = self.convertWkbToPolygons(geometry.wkbType())
out_geom = None
if QgsWkbTypes.flatType(output_wkb) == QgsWkbTypes.MultiPolygon:
out_geom = QgsMultiPolygon()
else:
out_geom = QgsMultiSurface()
for surface in surfaces:
out_geom.addGeometry(surface)
return out_geom
def getSurfaces(self, geometry):
surfaces = []
if isinstance(geometry, QgsGeometryCollection):
# collection
for i in range(geometry.numGeometries()):
surfaces.extend(self.getSurfaces(geometry.geometryN(i)))
else:
# not collection
if geometry.vertexCount() > 2:
surface = QgsPolygon()
surface.setExteriorRing(geometry.clone())
surfaces.append(surface)
return surfaces