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153 lines
5.5 KiB
Python
153 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Delaunay.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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from builtins import next
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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 (QgsField,
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QgsFeatureRequest,
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QgsFeatureSink,
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QgsFeature,
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QgsGeometry,
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QgsPointXY,
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QgsWkbTypes,
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QgsProcessingUtils,
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QgsFields)
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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.outputs import OutputVector
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from processing.tools import dataobjects
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from . import voronoi
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Delaunay(QgisAlgorithm):
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INPUT = 'INPUT'
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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', 'delaunay.png'))
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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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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POINT]))
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self.addOutput(OutputVector(self.OUTPUT,
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self.tr('Delaunay triangulation'),
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datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def name(self):
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return 'delaunaytriangulation'
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def displayName(self):
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return self.tr('Delaunay triangulation')
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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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fields = QgsFields()
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fields.append(QgsField('POINTA', QVariant.Double, '', 24, 15))
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fields.append(QgsField('POINTB', QVariant.Double, '', 24, 15))
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fields.append(QgsField('POINTC', QVariant.Double, '', 24, 15))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.Polygon, layer.crs(), context)
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pts = []
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ptDict = {}
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ptNdx = -1
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c = voronoi.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, inFeat in enumerate(features):
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geom = QgsGeometry(inFeat.geometry())
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if geom.isNull():
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continue
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if geom.isMultipart():
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points = geom.asMultiPoint()
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else:
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points = [geom.asPoint()]
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for n, point in enumerate(points):
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x = point.x()
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y = point.y()
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pts.append((x, y))
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ptNdx += 1
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ptDict[ptNdx] = (inFeat.id(), n)
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feedback.setProgress(int(current * total))
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if len(pts) < 3:
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raise GeoAlgorithmExecutionException(
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self.tr('Input file should contain at least 3 points. Choose '
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'another file and try again.'))
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uniqueSet = set(item for item in pts)
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ids = [pts.index(item) for item in uniqueSet]
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sl = voronoi.SiteList([voronoi.Site(*i) for i in uniqueSet])
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c.triangulate = True
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voronoi.voronoi(sl, c)
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triangles = c.triangles
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feat = QgsFeature()
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total = 100.0 / len(triangles) if triangles else 1
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for current, triangle in enumerate(triangles):
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indices = list(triangle)
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indices.append(indices[0])
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polygon = []
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attrs = []
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step = 0
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for index in indices:
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fid, n = ptDict[ids[index]]
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request = QgsFeatureRequest().setFilterFid(fid)
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inFeat = next(layer.getFeatures(request))
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geom = QgsGeometry(inFeat.geometry())
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if geom.isMultipart():
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point = QgsPointXY(geom.asMultiPoint()[n])
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else:
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point = QgsPointXY(geom.asPoint())
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polygon.append(point)
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if step <= 3:
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attrs.append(ids[index])
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step += 1
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feat.setAttributes(attrs)
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geometry = QgsGeometry().fromPolygon([polygon])
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feat.setGeometry(geometry)
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writer.addFeature(feat, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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