mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-30 00:07:09 -04:00
152 lines
5.4 KiB
Python
152 lines
5.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Delaunay.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.PyQt.QtCore import QVariant
|
|
|
|
from qgis.core import (QgsField,
|
|
QgsFeatureRequest,
|
|
QgsFeature,
|
|
QgsGeometry,
|
|
QgsPointXY,
|
|
QgsWkbTypes,
|
|
QgsProcessingUtils,
|
|
QgsFields)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects
|
|
|
|
from . import voronoi
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class Delaunay(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'delaunay.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry tools')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
self.addParameter(ParameterVector(self.INPUT,
|
|
self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POINT]))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT,
|
|
self.tr('Delaunay triangulation'),
|
|
datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
|
|
|
|
def name(self):
|
|
return 'delaunaytriangulation'
|
|
|
|
def displayName(self):
|
|
return self.tr('Delaunay triangulation')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
|
|
|
|
fields = QgsFields()
|
|
fields.append(QgsField('POINTA', QVariant.Double, '', 24, 15))
|
|
fields.append(QgsField('POINTB', QVariant.Double, '', 24, 15))
|
|
fields.append(QgsField('POINTC', QVariant.Double, '', 24, 15))
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.Polygon, layer.crs(), context)
|
|
|
|
pts = []
|
|
ptDict = {}
|
|
ptNdx = -1
|
|
c = voronoi.Context()
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
for current, inFeat in enumerate(features):
|
|
geom = QgsGeometry(inFeat.geometry())
|
|
if geom.isNull():
|
|
continue
|
|
if geom.isMultipart():
|
|
points = geom.asMultiPoint()
|
|
else:
|
|
points = [geom.asPoint()]
|
|
for n, point in enumerate(points):
|
|
x = point.x()
|
|
y = point.y()
|
|
pts.append((x, y))
|
|
ptNdx += 1
|
|
ptDict[ptNdx] = (inFeat.id(), n)
|
|
feedback.setProgress(int(current * total))
|
|
|
|
if len(pts) < 3:
|
|
raise GeoAlgorithmExecutionException(
|
|
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) for i in uniqueSet])
|
|
c.triangulate = True
|
|
voronoi.voronoi(sl, c)
|
|
triangles = c.triangles
|
|
feat = QgsFeature()
|
|
|
|
total = 100.0 / len(triangles)
|
|
for current, triangle in enumerate(triangles):
|
|
indices = list(triangle)
|
|
indices.append(indices[0])
|
|
polygon = []
|
|
attrs = []
|
|
step = 0
|
|
for index in indices:
|
|
fid, n = ptDict[ids[index]]
|
|
request = QgsFeatureRequest().setFilterFid(fid)
|
|
inFeat = next(layer.getFeatures(request))
|
|
geom = QgsGeometry(inFeat.geometry())
|
|
if geom.isMultipart():
|
|
point = QgsPointXY(geom.asMultiPoint()[n])
|
|
else:
|
|
point = QgsPointXY(geom.asPoint())
|
|
polygon.append(point)
|
|
if step <= 3:
|
|
attrs.append(ids[index])
|
|
step += 1
|
|
feat.setAttributes(attrs)
|
|
geometry = QgsGeometry().fromPolygon([polygon])
|
|
feat.setGeometry(geometry)
|
|
writer.addFeature(feat)
|
|
feedback.setProgress(int(current * total))
|
|
|
|
del writer
|