mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-08 00:02:35 -05:00
3bcf287a7e
* [processing] qgis regular points test * [processing] qgis shape buffer variable tests * [processing] qgis create grid lines test * [processing] qgis convert geometry test * [processing] qgis extract by location test * [processing] qgis add field test * [processing] trying to fix travis failing * [processing] trying to fix travis failing/2 * trying to fix travis failing/3 * [processing] Add new default option "ProjectCrs" to ParameterCrs * [processing] RegularPoints tests shouldn't rely on iface * [processing] Fix regular points test * [processing] RandmPointsExtent new CRS parameter * [processing] qgis random point in extent test * [processing] qgis random point in extent test/2 * [processing] remove qgis random point in extent test * no output random points in extent test * remove useless output
131 lines
5.1 KiB
Python
131 lines
5.1 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. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
from builtins import str
|
|
|
|
__author__ = 'Alexander Bruy'
|
|
__date__ = 'April 2014'
|
|
__copyright__ = '(C) 2014, Alexander Bruy'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
import random
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsGeometry, QgsRectangle, QgsFeature, QgsFields, QgsWkbTypes,
|
|
QgsField, QgsSpatialIndex, QgsPoint,
|
|
QgsCoordinateReferenceSystem)
|
|
from qgis.utils import iface
|
|
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.ProcessingLog import ProcessingLog
|
|
from processing.core.parameters import ParameterExtent
|
|
from processing.core.parameters import ParameterNumber
|
|
from processing.core.parameters import ParameterCrs
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import vector, dataobjects
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class RandomPointsExtent(GeoAlgorithm):
|
|
|
|
EXTENT = 'EXTENT'
|
|
POINT_NUMBER = 'POINT_NUMBER'
|
|
MIN_DISTANCE = 'MIN_DISTANCE'
|
|
OUTPUT = 'OUTPUT'
|
|
CRS = 'CRS'
|
|
|
|
def getIcon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'random_points.png'))
|
|
|
|
def defineCharacteristics(self):
|
|
self.name, self.i18n_name = self.trAlgorithm('Random points in extent')
|
|
self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
|
|
self.addParameter(ParameterExtent(self.EXTENT,
|
|
self.tr('Input extent'), optional=False))
|
|
self.addParameter(ParameterNumber(self.POINT_NUMBER,
|
|
self.tr('Points number'), 1, None, 1))
|
|
self.addParameter(ParameterNumber(self.MIN_DISTANCE,
|
|
self.tr('Minimum distance'), 0.0, None, 0.0))
|
|
self.addParameter(ParameterCrs(self.CRS,
|
|
self.tr('Output layer CRS'), 'ProjectCrs'))
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Random points'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
|
|
|
|
def processAlgorithm(self, feedback):
|
|
pointCount = int(self.getParameterValue(self.POINT_NUMBER))
|
|
minDistance = float(self.getParameterValue(self.MIN_DISTANCE))
|
|
extent = str(self.getParameterValue(self.EXTENT)).split(',')
|
|
|
|
crsId = self.getParameterValue(self.CRS)
|
|
crs = QgsCoordinateReferenceSystem()
|
|
crs.createFromUserInput(crsId)
|
|
|
|
xMin = float(extent[0])
|
|
xMax = float(extent[1])
|
|
yMin = float(extent[2])
|
|
yMax = float(extent[3])
|
|
extent = QgsGeometry().fromRect(
|
|
QgsRectangle(xMin, yMin, xMax, yMax))
|
|
|
|
fields = QgsFields()
|
|
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
|
|
fields, QgsWkbTypes.Point, crs)
|
|
|
|
nPoints = 0
|
|
nIterations = 0
|
|
maxIterations = pointCount * 200
|
|
total = 100.0 / pointCount
|
|
|
|
index = QgsSpatialIndex()
|
|
points = dict()
|
|
|
|
random.seed()
|
|
|
|
while nIterations < maxIterations and nPoints < pointCount:
|
|
rx = xMin + (xMax - xMin) * random.random()
|
|
ry = yMin + (yMax - yMin) * random.random()
|
|
|
|
pnt = QgsPoint(rx, ry)
|
|
geom = QgsGeometry.fromPoint(pnt)
|
|
if geom.within(extent) and \
|
|
vector.checkMinDistance(pnt, index, minDistance, points):
|
|
f = QgsFeature(nPoints)
|
|
f.initAttributes(1)
|
|
f.setFields(fields)
|
|
f.setAttribute('id', nPoints)
|
|
f.setGeometry(geom)
|
|
writer.addFeature(f)
|
|
index.insertFeature(f)
|
|
points[nPoints] = pnt
|
|
nPoints += 1
|
|
feedback.setProgress(int(nPoints * total))
|
|
nIterations += 1
|
|
|
|
if nPoints < pointCount:
|
|
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
|
|
self.tr('Can not generate requested number of random points. '
|
|
'Maximum number of attempts exceeded.'))
|
|
|
|
del writer
|