mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
282 lines
10 KiB
Python
282 lines
10 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
VoronoiPolygons.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. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
from builtins import next
|
|
|
|
__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 (QgsFeatureRequest,
|
|
QgsFeatureSink,
|
|
QgsFeature,
|
|
QgsGeometry,
|
|
QgsPointXY,
|
|
QgsWkbTypes,
|
|
QgsProcessing,
|
|
QgsProcessingException,
|
|
QgsProcessingParameterFeatureSource,
|
|
QgsProcessingParameterFeatureSink,
|
|
QgsProcessingParameterNumber)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
from . import voronoi
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class VoronoiPolygons(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
BUFFER = 'BUFFER'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'voronoi.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'), [QgsProcessing.TypeVectorPoint]))
|
|
self.addParameter(QgsProcessingParameterNumber(self.BUFFER, self.tr('Buffer region'), type=QgsProcessingParameterNumber.Double,
|
|
minValue=0.0, maxValue=9999999999, defaultValue=0.0))
|
|
|
|
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Voronoi polygons'), type=QgsProcessing.TypeVectorPolygon))
|
|
|
|
def name(self):
|
|
return 'voronoipolygons'
|
|
|
|
def displayName(self):
|
|
return self.tr('Voronoi polygons')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
source = self.parameterAsSource(parameters, self.INPUT, context)
|
|
buf = self.parameterAsDouble(parameters, self.BUFFER, context)
|
|
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
|
|
source.fields(), QgsWkbTypes.Polygon, source.sourceCrs())
|
|
|
|
outFeat = QgsFeature()
|
|
extent = source.sourceExtent()
|
|
extraX = extent.height() * (buf / 100.0)
|
|
extraY = extent.width() * (buf / 100.0)
|
|
height = extent.height()
|
|
width = extent.width()
|
|
c = voronoi.Context()
|
|
pts = []
|
|
ptDict = {}
|
|
ptNdx = -1
|
|
|
|
features = source.getFeatures()
|
|
total = 100.0 / source.featureCount() if source.featureCount() else 0
|
|
for current, inFeat in enumerate(features):
|
|
if feedback.isCanceled():
|
|
break
|
|
geom = inFeat.geometry()
|
|
point = geom.asPoint()
|
|
x = point.x() - extent.xMinimum()
|
|
y = point.y() - extent.yMinimum()
|
|
pts.append((x, y))
|
|
ptNdx += 1
|
|
ptDict[ptNdx] = inFeat.id()
|
|
feedback.setProgress(int(current * total))
|
|
|
|
if len(pts) < 3:
|
|
raise QgsProcessingException(
|
|
self.tr('Input file should contain at least 3 points. Choose '
|
|
'another file and try again.'))
|
|
|
|
uniqueSet = set(item for item in pts)
|
|
ids = [pts.index(item) for item in uniqueSet]
|
|
sl = voronoi.SiteList([voronoi.Site(i[0], i[1], sitenum=j) for (j,
|
|
i) in enumerate(uniqueSet)])
|
|
voronoi.voronoi(sl, c)
|
|
inFeat = QgsFeature()
|
|
|
|
current = 0
|
|
if len(c.polygons) == 0:
|
|
raise QgsProcessingException(
|
|
self.tr('There were no polygons created.'))
|
|
|
|
total = 100.0 / len(c.polygons)
|
|
|
|
for (site, edges) in list(c.polygons.items()):
|
|
if feedback.isCanceled():
|
|
break
|
|
|
|
request = QgsFeatureRequest().setFilterFid(ptDict[ids[site]])
|
|
inFeat = next(source.getFeatures(request))
|
|
lines = self.clip_voronoi(edges, c, width, height, extent, extraX, extraY)
|
|
|
|
geom = QgsGeometry.fromMultiPointXY(lines)
|
|
geom = QgsGeometry(geom.convexHull())
|
|
outFeat.setGeometry(geom)
|
|
outFeat.setAttributes(inFeat.attributes())
|
|
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
|
|
|
|
current += 1
|
|
feedback.setProgress(int(current * total))
|
|
|
|
return {self.OUTPUT: dest_id}
|
|
|
|
def clip_voronoi(self, edges, c, width, height, extent, exX, exY):
|
|
"""Clip voronoi function based on code written for Inkscape.
|
|
Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
|
|
"""
|
|
|
|
def clip_line(x1, y1, x2, y2, w, h, x, y):
|
|
if x1 < 0 - x and x2 < 0 - x:
|
|
return [0, 0, 0, 0]
|
|
if x1 > w + x and x2 > w + x:
|
|
return [0, 0, 0, 0]
|
|
if x1 < 0 - x:
|
|
y1 = (y1 * x2 - y2 * x1) / (x2 - x1)
|
|
x1 = 0 - x
|
|
if x2 < 0 - x:
|
|
y2 = (y1 * x2 - y2 * x1) / (x2 - x1)
|
|
x2 = 0 - x
|
|
if x1 > w + x:
|
|
y1 = y1 + (w + x - x1) * (y2 - y1) / (x2 - x1)
|
|
x1 = w + x
|
|
if x2 > w + x:
|
|
y2 = y1 + (w + x - x1) * (y2 - y1) / (x2 - x1)
|
|
x2 = w + x
|
|
if y1 < 0 - y and y2 < 0 - y:
|
|
return [0, 0, 0, 0]
|
|
if y1 > h + y and y2 > h + y:
|
|
return [0, 0, 0, 0]
|
|
if x1 == x2 and y1 == y2:
|
|
return [0, 0, 0, 0]
|
|
if y1 < 0 - y:
|
|
x1 = (x1 * y2 - x2 * y1) / (y2 - y1)
|
|
y1 = 0 - y
|
|
if y2 < 0 - y:
|
|
x2 = (x1 * y2 - x2 * y1) / (y2 - y1)
|
|
y2 = 0 - y
|
|
if y1 > h + y:
|
|
x1 = x1 + (h + y - y1) * (x2 - x1) / (y2 - y1)
|
|
y1 = h + y
|
|
if y2 > h + y:
|
|
x2 = x1 + (h + y - y1) * (x2 - x1) / (y2 - y1)
|
|
y2 = h + y
|
|
return [x1, y1, x2, y2]
|
|
|
|
lines = []
|
|
hasXMin = False
|
|
hasYMin = False
|
|
hasXMax = False
|
|
hasYMax = False
|
|
for edge in edges:
|
|
if edge[1] >= 0 and edge[2] >= 0:
|
|
# Two vertices
|
|
[x1, y1, x2, y2] = clip_line(
|
|
c.vertices[edge[1]][0],
|
|
c.vertices[edge[1]][1],
|
|
c.vertices[edge[2]][0],
|
|
c.vertices[edge[2]][1],
|
|
width,
|
|
height,
|
|
exX,
|
|
exY,
|
|
)
|
|
elif edge[1] >= 0:
|
|
# Only one vertex
|
|
if c.lines[edge[0]][1] == 0:
|
|
# Vertical line
|
|
xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
|
|
if c.vertices[edge[1]][1] > (height + exY) / 2:
|
|
ytemp = height + exY
|
|
else:
|
|
ytemp = 0 - exX
|
|
else:
|
|
xtemp = width + exX
|
|
ytemp = (c.lines[edge[0]][2] - (width + exX) *
|
|
c.lines[edge[0]][0]) / c.lines[edge[0]][1]
|
|
[x1, y1, x2, y2] = clip_line(
|
|
c.vertices[edge[1]][0],
|
|
c.vertices[edge[1]][1],
|
|
xtemp,
|
|
ytemp,
|
|
width,
|
|
height,
|
|
exX,
|
|
exY,
|
|
)
|
|
elif edge[2] >= 0:
|
|
# Only one vertex
|
|
if c.lines[edge[0]][1] == 0:
|
|
# Vertical line
|
|
xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
|
|
if c.vertices[edge[2]][1] > (height + exY) / 2:
|
|
ytemp = height + exY
|
|
else:
|
|
ytemp = 0.0 - exY
|
|
else:
|
|
xtemp = 0.0 - exX
|
|
ytemp = c.lines[edge[0]][2] / c.lines[edge[0]][1]
|
|
[x1, y1, x2, y2] = clip_line(
|
|
xtemp,
|
|
ytemp,
|
|
c.vertices[edge[2]][0],
|
|
c.vertices[edge[2]][1],
|
|
width,
|
|
height,
|
|
exX,
|
|
exY,
|
|
)
|
|
if x1 or x2 or y1 or y2:
|
|
lines.append(QgsPointXY(x1 + extent.xMinimum(),
|
|
y1 + extent.yMinimum()))
|
|
lines.append(QgsPointXY(x2 + extent.xMinimum(),
|
|
y2 + extent.yMinimum()))
|
|
if 0 - exX in (x1, x2):
|
|
hasXMin = True
|
|
if 0 - exY in (y1, y2):
|
|
hasYMin = True
|
|
if height + exY in (y1, y2):
|
|
hasYMax = True
|
|
if width + exX in (x1, x2):
|
|
hasXMax = True
|
|
if hasXMin:
|
|
if hasYMax:
|
|
lines.append(QgsPointXY(extent.xMinimum() - exX,
|
|
height + extent.yMinimum() + exY))
|
|
if hasYMin:
|
|
lines.append(QgsPointXY(extent.xMinimum() - exX,
|
|
extent.yMinimum() - exY))
|
|
if hasXMax:
|
|
if hasYMax:
|
|
lines.append(QgsPointXY(width + extent.xMinimum() + exX,
|
|
height + extent.yMinimum() + exY))
|
|
if hasYMin:
|
|
lines.append(QgsPointXY(width + extent.xMinimum() + exX,
|
|
extent.yMinimum() - exY))
|
|
return lines
|