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[processing] port Random points in polygons

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This commit is contained in:
Alexander Bruy 2017-07-21 14:29:42 +03:00
parent ae2e32b36e
commit f8b0c06942
4 changed files with 222 additions and 303 deletions
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4
python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
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@ -86,6 +86,7 @@ from .RandomExtract import RandomExtract
from .RandomExtractWithinSubsets import RandomExtractWithinSubsets
from .RandomPointsExtent import RandomPointsExtent
from .RandomPointsLayer import RandomPointsLayer
from .RandomPointsPolygons import RandomPointsPolygons
from .RegularPoints import RegularPoints
from .ReverseLineDirection import ReverseLineDirection
from .Ruggedness import Ruggedness
@ -143,8 +144,6 @@ from .ZonalStatistics import ZonalStatistics
# from .PointsDisplacement import PointsDisplacement
# from .PointsFromPolygons import PointsFromPolygons
# from .PointsFromLines import PointsFromLines
# from .RandomPointsPolygonsFixed import RandomPointsPolygonsFixed
# from .RandomPointsPolygonsVariable import RandomPointsPolygonsVariable
# from .RandomPointsAlongLines import RandomPointsAlongLines
# from .PointsToPaths import PointsToPaths
# from .SetVectorStyle import SetVectorStyle
@ -274,6 +273,7 @@ class QGISAlgorithmProvider(QgsProcessingProvider):
RandomExtractWithinSubsets(),
RandomPointsExtent(),
RandomPointsLayer(),
RandomPointsPolygons(),
RegularPoints(),
ReverseLineDirection(),
Ruggedness(),

220
python/plugins/processing/algs/qgis/RandomPointsPolygons.py Normal file
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@ -0,0 +1,220 @@
# -*- coding: utf-8 -*-
"""
***************************************************************************
RandomPointsPolygons.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'
# 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 (QgsField,
QgsFeatureSink,
QgsFeature,
QgsFields,
QgsGeometry,
QgsPoint,
QgsPointXY,
QgsWkbTypes,
QgsSpatialIndex,
QgsFeatureRequest,
QgsExpression,
QgsDistanceArea,
QgsProject,
QgsProcessing,
QgsProcessingException,
QgsProcessingParameterNumber,
QgsProcessingParameterBoolean,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFeatureSink,
QgsProcessingParameterExpression,
QgsProcessingParameterEnum,
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 RandomPointsPolygons(QgisAlgorithm):
INPUT = 'INPUT'
EXPRESSION = 'EXPRESSION'
MIN_DISTANCE = 'MIN_DISTANCE'
STRATEGY = 'STRATEGY'
ADD_Z = 'ADD_Z'
ADD_M = 'ADD_M'
OUTPUT = 'OUTPUT'
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'random_points.png'))
def group(self):
return self.tr('Vector creation tools')
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.strategies = [self.tr('Points count'),
self.tr('Points density')]
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
self.tr('Input layer'),
[QgsProcessing.TypeVectorPolygon]))
self.addParameter(QgsProcessingParameterEnum(self.STRATEGY,
self.tr('Sampling strategy'),
self.strategies,
False,
0))
self.addParameter(QgsProcessingParameterExpression(self.EXPRESSION,
self.tr('Expression'),
parentLayerParameterName=self.INPUT))
self.addParameter(QgsProcessingParameterNumber(self.MIN_DISTANCE,
self.tr('Minimum distance between points'),
QgsProcessingParameterNumber.Double,
0, False, 0, 1000000000))
params = []
params.append(QgsProcessingParameterBoolean(self.ADD_Z,
self.tr('Add Z coordinate'),
False))
params.append(QgsProcessingParameterBoolean(self.ADD_M,
self.tr('Add M coordinate'),
False))
for p in params:
p.setFlags(p.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(p)
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
self.tr('Random points'),
type=QgsProcessing.TypeVectorPoint))
def name(self):
return 'randompointsinsidepolygons'
def displayName(self):
return self.tr('Random points inside polygons')
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
strategy = self.parameterAsEnum(parameters, self.STRATEGY, context)
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE, context)
addZ = self.parameterAsBool(parameters, self.ADD_Z, context)
addM = self.parameterAsBool(parameters, self.ADD_M, context)
expression = QgsExpression(self.parameterAsString(parameters, self.EXPRESSION, context))
if expression.hasParserError():
raise ProcessingException(expression.parserErrorString())
expressionContext = self.createExpressionContext(parameters, context)
if not expression.prepare(expressionContext):
raise ProcessingException(
self.tr('Evaluation error: {0}').format(expression.evalErrorString()))
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
wkbType = QgsWkbTypes.Point
if addZ:
wkbType = QgsWkbTypes.addZ(wkbType)
if addM:
wkbType = QgsWkbTypes.addM(wkbType)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, wkbType, source.sourceCrs())
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs())
da.setEllipsoid(QgsProject.instance().ellipsoid())
total = 100.0 / source.featureCount() if source.featureCount() else 0
for current, f in enumerate(source.getFeatures()):
if feedback.isCanceled():
break
expressionContext.setFeature(f)
value = expression.evaluate(expressionContext)
if expression.hasEvalError():
feedback.pushInfo(
self.tr('Evaluation error for feature ID {}: {}').format(f.id(), expression.evalErrorString()))
continue
fGeom = f.geometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(value)
else:
pointCount = int(round(value * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo("Skip feature {} as number of points for it is 0.")
continue
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
total = 100.0 / pointCount if pointCount else 1
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()
pnt = QgsPoint(rx, ry)
p = QgsPointXY(rx, ry)
if addZ:
pnt.addZValue(0.0)
if addM:
pnt.addMValue(0.0)
geom = QgsGeometry(pnt)
if geom.within(fGeom) 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.insertFeature(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.'))
feedback.setProgress(0)
return {self.OUTPUT: dest_id}

150
python/plugins/processing/algs/qgis/RandomPointsPolygonsFixed.py
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@ -1,150 +0,0 @@
# -*- coding: utf-8 -*-
"""
***************************************************************************
RandomPointsPolygonsFixed.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'
# 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 (QgsFields, QgsFeatureSink, QgsField, QgsDistanceArea, QgsGeometry, QgsWkbTypes,
QgsSpatialIndex, QgsPointXY, QgsFeature,
QgsMessageLog,
QgsProcessingUtils,
QgsProject)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterNumber
from processing.core.parameters import ParameterSelection
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class RandomPointsPolygonsFixed(QgisAlgorithm):
VECTOR = 'VECTOR'
VALUE = 'VALUE'
MIN_DISTANCE = 'MIN_DISTANCE'
STRATEGY = 'STRATEGY'
OUTPUT = 'OUTPUT'
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'random_points.png'))
def group(self):
return self.tr('Vector creation tools')
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.strategies = [self.tr('Points count'),
self.tr('Points density')]
self.addParameter(ParameterVector(self.VECTOR,
self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POLYGON]))
self.addParameter(ParameterSelection(self.STRATEGY,
self.tr('Sampling strategy'), self.strategies, 0))
self.addParameter(ParameterNumber(self.VALUE,
self.tr('Number or density of points'), 0.0001, None, 1.0))
self.addParameter(ParameterNumber(self.MIN_DISTANCE,
self.tr('Minimum distance'), 0.0, None, 0.0))
self.addOutput(OutputVector(self.OUTPUT, self.tr('Random points'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
def name(self):
return 'randompointsinsidepolygonsfixed'
def displayName(self):
return self.tr('Random points inside polygons (fixed)')
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.VECTOR), context)
value = float(self.getParameterValue(self.VALUE))
minDistance = float(self.getParameterValue(self.MIN_DISTANCE))
strategy = self.getParameterValue(self.STRATEGY)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.Point, layer.crs(), context)
da = QgsDistanceArea()
da.setSourceCrs(layer.sourceCrs())
da.setEllipsoid(QgsProject.instance().ellipsoid())
features = QgsProcessingUtils.getFeatures(layer, context)
for current, f in enumerate(features):
fGeom = f.geometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(value)
else:
pointCount = int(round(value * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo("Skip feature {} as number of points for it is 0.")
continue
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
total = 100.0 / pointCount if pointCount else 1
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
rx = bbox.xMinimum() + bbox.width() * random.random()
ry = bbox.yMinimum() + bbox.height() * random.random()
pnt = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPoint(pnt)
if geom.within(fGeom) 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, QgsFeatureSink.FastInsert)
index.insertFeature(f)
points[nPoints] = pnt
nPoints += 1
feedback.setProgress(int(nPoints * total))
nIterations += 1
if nPoints < pointCount:
QgsMessageLog.logMessage(self.tr('Can not generate requested number of random '
'points. Maximum number of attempts exceeded.'), self.tr('Processing'), QgsMessageLog.INFO)
feedback.setProgress(0)
del writer

151
python/plugins/processing/algs/qgis/RandomPointsPolygonsVariable.py
View File

@ -1,151 +0,0 @@
# -*- coding: utf-8 -*-
"""
***************************************************************************
RandomPointsPolygonsVariable.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'
# 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 (QgsFields, QgsFeatureSink, QgsField, QgsFeature, QgsPointXY, QgsWkbTypes,
QgsGeometry, QgsSpatialIndex, QgsDistanceArea,
QgsMessageLog,
QgsProject,
QgsProcessingUtils)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.parameters import ParameterNumber
from processing.core.parameters import ParameterSelection
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class RandomPointsPolygonsVariable(QgisAlgorithm):
VECTOR = 'VECTOR'
FIELD = 'FIELD'
MIN_DISTANCE = 'MIN_DISTANCE'
STRATEGY = 'STRATEGY'
OUTPUT = 'OUTPUT'
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'random_points.png'))
def group(self):
return self.tr('Vector creation tools')
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.strategies = [self.tr('Points count'),
self.tr('Points density')]
self.addParameter(ParameterVector(self.VECTOR,
self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POLYGON]))
self.addParameter(ParameterSelection(self.STRATEGY,
self.tr('Sampling strategy'), self.strategies, 0))
self.addParameter(ParameterTableField(self.FIELD,
self.tr('Number field'),
self.VECTOR, ParameterTableField.DATA_TYPE_NUMBER))
self.addParameter(ParameterNumber(self.MIN_DISTANCE,
self.tr('Minimum distance'), 0.0, None, 0.0))
self.addOutput(OutputVector(self.OUTPUT, self.tr('Random points'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
def name(self):
return 'randompointsinsidepolygonsvariable'
def displayName(self):
return self.tr('Random points inside polygons (variable)')
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.VECTOR), context)
fieldName = self.getParameterValue(self.FIELD)
minDistance = float(self.getParameterValue(self.MIN_DISTANCE))
strategy = self.getParameterValue(self.STRATEGY)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.Point, layer.crs(), context)
da = QgsDistanceArea()
da.setSourceCrs(layer.sourceCrs())
da.setEllipsoid(QgsProject.instance().ellipsoid())
features = QgsProcessingUtils.getFeatures(layer, context)
for current, f in enumerate(features):
fGeom = f.geometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(f[fieldName])
else:
pointCount = int(round(f[fieldName] * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo("Skip feature {} as number of points for it is 0.")
continue
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
total = 100.0 / pointCount if pointCount else 1
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
rx = bbox.xMinimum() + bbox.width() * random.random()
ry = bbox.yMinimum() + bbox.height() * random.random()
pnt = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPoint(pnt)
if geom.within(fGeom) 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, QgsFeatureSink.FastInsert)
index.insertFeature(f)
points[nPoints] = pnt
nPoints += 1
feedback.setProgress(int(nPoints * total))
nIterations += 1
if nPoints < pointCount:
QgsMessageLog.logMessage(self.tr('Can not generate requested number of random '
'points. Maximum number of attempts exceeded.'), self.tr('Processing'), QgsMessageLog.INFO)
feedback.setProgress(0)
del writer