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282 lines
10 KiB
Python
282 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VoronoiPolygons.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.core import (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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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterNumber)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 VoronoiPolygons(QgisAlgorithm):
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INPUT = 'INPUT'
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BUFFER = 'BUFFER'
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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', 'voronoi.png'))
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def group(self):
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return self.tr('Vector geometry')
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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.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'), [QgsProcessing.TypeVectorPoint]))
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self.addParameter(QgsProcessingParameterNumber(self.BUFFER, self.tr('Buffer region'), type=QgsProcessingParameterNumber.Double,
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minValue=0.0, maxValue=9999999999, defaultValue=0.0))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Voronoi polygons'), type=QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'voronoipolygons'
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def displayName(self):
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return self.tr('Voronoi polygons')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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buf = self.parameterAsDouble(parameters, self.BUFFER, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), QgsWkbTypes.Polygon, source.sourceCrs())
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outFeat = QgsFeature()
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extent = source.sourceExtent()
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extraX = extent.height() * (buf / 100.0)
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extraY = extent.width() * (buf / 100.0)
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height = extent.height()
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width = extent.width()
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c = voronoi.Context()
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pts = []
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ptDict = {}
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ptNdx = -1
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, inFeat in enumerate(features):
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if feedback.isCanceled():
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break
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geom = inFeat.geometry()
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point = geom.asPoint()
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x = point.x() - extent.xMinimum()
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y = point.y() - extent.yMinimum()
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pts.append((x, y))
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ptNdx += 1
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ptDict[ptNdx] = inFeat.id()
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feedback.setProgress(int(current * total))
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if len(pts) < 3:
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raise QgsProcessingException(
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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[0], i[1], sitenum=j) for (j,
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i) in enumerate(uniqueSet)])
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voronoi.voronoi(sl, c)
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inFeat = QgsFeature()
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current = 0
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if len(c.polygons) == 0:
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raise QgsProcessingException(
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self.tr('There were no polygons created.'))
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total = 100.0 / len(c.polygons)
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for (site, edges) in list(c.polygons.items()):
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if feedback.isCanceled():
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break
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request = QgsFeatureRequest().setFilterFid(ptDict[ids[site]])
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inFeat = next(source.getFeatures(request))
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lines = self.clip_voronoi(edges, c, width, height, extent, extraX, extraY)
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geom = QgsGeometry.fromMultiPoint(lines)
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geom = QgsGeometry(geom.convexHull())
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outFeat.setGeometry(geom)
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outFeat.setAttributes(inFeat.attributes())
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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current += 1
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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def clip_voronoi(self, edges, c, width, height, extent, exX, exY):
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"""Clip voronoi function based on code written for Inkscape.
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Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
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"""
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def clip_line(x1, y1, x2, y2, w, h, x, y):
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if x1 < 0 - x and x2 < 0 - x:
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return [0, 0, 0, 0]
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if x1 > w + x and x2 > w + x:
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return [0, 0, 0, 0]
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if x1 < 0 - x:
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y1 = (y1 * x2 - y2 * x1) / (x2 - x1)
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x1 = 0 - x
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if x2 < 0 - x:
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y2 = (y1 * x2 - y2 * x1) / (x2 - x1)
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x2 = 0 - x
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if x1 > w + x:
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y1 = y1 + (w + x - x1) * (y2 - y1) / (x2 - x1)
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x1 = w + x
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if x2 > w + x:
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y2 = y1 + (w + x - x1) * (y2 - y1) / (x2 - x1)
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x2 = w + x
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if y1 < 0 - y and y2 < 0 - y:
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return [0, 0, 0, 0]
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if y1 > h + y and y2 > h + y:
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return [0, 0, 0, 0]
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if x1 == x2 and y1 == y2:
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return [0, 0, 0, 0]
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if y1 < 0 - y:
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x1 = (x1 * y2 - x2 * y1) / (y2 - y1)
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y1 = 0 - y
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if y2 < 0 - y:
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x2 = (x1 * y2 - x2 * y1) / (y2 - y1)
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y2 = 0 - y
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if y1 > h + y:
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x1 = x1 + (h + y - y1) * (x2 - x1) / (y2 - y1)
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y1 = h + y
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if y2 > h + y:
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x2 = x1 + (h + y - y1) * (x2 - x1) / (y2 - y1)
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y2 = h + y
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return [x1, y1, x2, y2]
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lines = []
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hasXMin = False
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hasYMin = False
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hasXMax = False
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hasYMax = False
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for edge in edges:
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if edge[1] >= 0 and edge[2] >= 0:
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# Two vertices
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[x1, y1, x2, y2] = clip_line(
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c.vertices[edge[1]][0],
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c.vertices[edge[1]][1],
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c.vertices[edge[2]][0],
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c.vertices[edge[2]][1],
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width,
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height,
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exX,
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exY,
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)
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elif edge[1] >= 0:
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# Only one vertex
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if c.lines[edge[0]][1] == 0:
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# Vertical line
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xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
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if c.vertices[edge[1]][1] > (height + exY) / 2:
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ytemp = height + exY
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else:
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ytemp = 0 - exX
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else:
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xtemp = width + exX
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ytemp = (c.lines[edge[0]][2] - (width + exX) *
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c.lines[edge[0]][0]) / c.lines[edge[0]][1]
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[x1, y1, x2, y2] = clip_line(
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c.vertices[edge[1]][0],
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c.vertices[edge[1]][1],
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xtemp,
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ytemp,
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width,
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height,
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exX,
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exY,
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)
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elif edge[2] >= 0:
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# Only one vertex
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if c.lines[edge[0]][1] == 0:
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# Vertical line
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xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
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if c.vertices[edge[2]][1] > (height + exY) / 2:
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ytemp = height + exY
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else:
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ytemp = 0.0 - exY
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else:
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xtemp = 0.0 - exX
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ytemp = c.lines[edge[0]][2] / c.lines[edge[0]][1]
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[x1, y1, x2, y2] = clip_line(
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xtemp,
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ytemp,
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c.vertices[edge[2]][0],
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c.vertices[edge[2]][1],
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width,
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height,
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exX,
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exY,
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)
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if x1 or x2 or y1 or y2:
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lines.append(QgsPointXY(x1 + extent.xMinimum(),
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y1 + extent.yMinimum()))
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lines.append(QgsPointXY(x2 + extent.xMinimum(),
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y2 + extent.yMinimum()))
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if 0 - exX in (x1, x2):
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hasXMin = True
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if 0 - exY in (y1, y2):
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hasYMin = True
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if height + exY in (y1, y2):
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hasYMax = True
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if width + exX in (x1, x2):
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hasXMax = True
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if hasXMin:
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if hasYMax:
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lines.append(QgsPointXY(extent.xMinimum() - exX,
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height + extent.yMinimum() + exY))
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if hasYMin:
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lines.append(QgsPointXY(extent.xMinimum() - exX,
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extent.yMinimum() - exY))
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if hasXMax:
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if hasYMax:
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lines.append(QgsPointXY(width + extent.xMinimum() + exX,
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height + extent.yMinimum() + exY))
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if hasYMin:
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lines.append(QgsPointXY(width + extent.xMinimum() + exX,
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extent.yMinimum() - exY))
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return lines
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