mirror of
https://github.com/qgis/QGIS.git
synced 2025-11-04 00:04:25 -05:00
2628c480c5
Prevent changes to files that weren't changed between releases. This eases review of the changes between releases significantly.
152 lines
6.0 KiB
Python
152 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
RandomPointsExtent.py
|
|
---------------------
|
|
Date : April 2014
|
|
Copyright : (C) 2014 by Alexander Bruy
|
|
Email : alexander dot bruy 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__ = 'Alexander Bruy'
|
|
__date__ = 'April 2014'
|
|
__copyright__ = '(C) 2014, Alexander Bruy'
|
|
|
|
import os
|
|
import random
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsApplication,
|
|
QgsField,
|
|
QgsFeatureSink,
|
|
QgsFeature,
|
|
QgsFields,
|
|
QgsGeometry,
|
|
QgsPointXY,
|
|
QgsWkbTypes,
|
|
QgsSpatialIndex,
|
|
QgsProcessing,
|
|
QgsProcessingException,
|
|
QgsProcessingParameterDistance,
|
|
QgsProcessingParameterExtent,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterCrs,
|
|
QgsProcessingParameterFeatureSink,
|
|
QgsProcessingParameterDefinition)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
from processing.tools import vector
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class RandomPointsExtent(QgisAlgorithm):
|
|
|
|
EXTENT = 'EXTENT'
|
|
POINTS_NUMBER = 'POINTS_NUMBER'
|
|
MIN_DISTANCE = 'MIN_DISTANCE'
|
|
TARGET_CRS = 'TARGET_CRS'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QgsApplication.getThemeIcon("/algorithms/mAlgorithmRandomPointsWithinExtent.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("/algorithms/mAlgorithmRandomPointsWithinExtent.svg")
|
|
|
|
def group(self):
|
|
return self.tr('Vector creation')
|
|
|
|
def groupId(self):
|
|
return 'vectorcreation'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.addParameter(QgsProcessingParameterExtent(self.EXTENT, self.tr('Input extent')))
|
|
self.addParameter(QgsProcessingParameterNumber(self.POINTS_NUMBER,
|
|
self.tr('Number of points'),
|
|
QgsProcessingParameterNumber.Integer,
|
|
1, False, 1, 1000000000))
|
|
self.addParameter(QgsProcessingParameterDistance(self.MIN_DISTANCE,
|
|
self.tr('Minimum distance between points'),
|
|
0, self.TARGET_CRS, False, 0, 1000000000))
|
|
self.addParameter(QgsProcessingParameterCrs(self.TARGET_CRS,
|
|
self.tr('Target CRS'),
|
|
'ProjectCrs'))
|
|
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
|
|
self.tr('Random points'),
|
|
type=QgsProcessing.TypeVectorPoint))
|
|
|
|
def name(self):
|
|
return 'randompointsinextent'
|
|
|
|
def displayName(self):
|
|
return self.tr('Random points in extent')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
pointCount = self.parameterAsDouble(parameters, self.POINTS_NUMBER, context)
|
|
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE, context)
|
|
crs = self.parameterAsCrs(parameters, self.TARGET_CRS, context)
|
|
bbox = self.parameterAsExtent(parameters, self.EXTENT, context, crs)
|
|
|
|
extent = QgsGeometry().fromRect(bbox)
|
|
|
|
fields = QgsFields()
|
|
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
|
|
|
|
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
|
|
fields, QgsWkbTypes.Point, crs)
|
|
if sink is None:
|
|
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
|
|
|
|
nPoints = 0
|
|
nIterations = 0
|
|
maxIterations = pointCount * 200
|
|
total = 100.0 / pointCount if pointCount else 1
|
|
|
|
index = QgsSpatialIndex()
|
|
points = dict()
|
|
|
|
random.seed()
|
|
|
|
while nIterations < maxIterations and nPoints < pointCount:
|
|
if feedback.isCanceled():
|
|
break
|
|
|
|
rx = bbox.xMinimum() + bbox.width() * random.random()
|
|
ry = bbox.yMinimum() + bbox.height() * random.random()
|
|
|
|
p = QgsPointXY(rx, ry)
|
|
geom = QgsGeometry.fromPointXY(p)
|
|
if geom.within(extent) and \
|
|
vector.checkMinDistance(p, index, minDistance, points):
|
|
f = QgsFeature(nPoints)
|
|
f.initAttributes(1)
|
|
f.setFields(fields)
|
|
f.setAttribute('id', nPoints)
|
|
f.setGeometry(geom)
|
|
sink.addFeature(f, QgsFeatureSink.FastInsert)
|
|
index.addFeature(f)
|
|
points[nPoints] = p
|
|
nPoints += 1
|
|
feedback.setProgress(int(nPoints * total))
|
|
nIterations += 1
|
|
|
|
if nPoints < pointCount:
|
|
feedback.pushInfo(self.tr('Could not generate requested number of random points. '
|
|
'Maximum number of attempts exceeded.'))
|
|
|
|
return {self.OUTPUT: dest_id}
|