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ExtractByLocation.py
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ExtractByLocation.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
ExtractByLocation.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__ = '$Format:%H$'
from qgis.core import QgsFeatureRequest
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterGeometryPredicate
from processing.core.parameters import ParameterNumber
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector
class ExtractByLocation(GeoAlgorithm):
INPUT = 'INPUT'
INTERSECT = 'INTERSECT'
PREDICATE = 'PREDICATE'
PRECISION = 'PRECISION'
OUTPUT = 'OUTPUT'
def defineCharacteristics(self):
self.name, self.i18n_name = self.trAlgorithm('Extract by location')
self.group, self.i18n_group = self.trAlgorithm('Vector selection tools')
self.addParameter(ParameterVector(self.INPUT,
self.tr('Layer to select from')))
self.addParameter(ParameterVector(self.INTERSECT,
self.tr('Additional layer (intersection layer)')))
self.addParameter(ParameterGeometryPredicate(self.PREDICATE,
self.tr('Geometric predicate'),
left=self.INPUT, right=self.INTERSECT))
self.addParameter(ParameterNumber(self.PRECISION,
self.tr('Precision'),
0.0, None, 0.0))
self.addOutput(OutputVector(self.OUTPUT, self.tr('Extracted (location)')))
def processAlgorithm(self, progress):
filename = self.getParameterValue(self.INPUT)
layer = dataobjects.getObjectFromUri(filename)
filename = self.getParameterValue(self.INTERSECT)
selectLayer = dataobjects.getObjectFromUri(filename)
predicates = self.getParameterValue(self.PREDICATE)
precision = self.getParameterValue(self.PRECISION)
index = vector.spatialindex(layer)
output = self.getOutputFromName(self.OUTPUT)
writer = output.getVectorWriter(layer.fields(),
layer.wkbType(), layer.crs())
if 'disjoint' in predicates:
disjoinSet = []
for feat in vector.features(layer):
disjoinSet.append(feat.id())
selectedSet = []
features = vector.features(selectLayer)
total = 100.0 / len(features)
for current, f in enumerate(features):
geom = vector.snapToPrecision(f.geometry(), precision)
bbox = vector.bufferedBoundingBox(geom.boundingBox(), 0.51 * precision)
intersects = index.intersects(bbox)
for i in intersects:
request = QgsFeatureRequest().setFilterFid(i)
feat = next(layer.getFeatures(request))
tmpGeom = vector.snapToPrecision(feat.geometry(), precision)
res = False
for predicate in predicates:
if predicate == 'disjoint':
if tmpGeom.intersects(geom):
try:
disjoinSet.remove(feat.id())
except:
pass # already removed
else:
if predicate == 'intersects':
res = tmpGeom.intersects(geom)
elif predicate == 'contains':
res = tmpGeom.contains(geom)
elif predicate == 'equals':
res = tmpGeom.equals(geom)
elif predicate == 'touches':
res = tmpGeom.touches(geom)
elif predicate == 'overlaps':
res = tmpGeom.overlaps(geom)
elif predicate == 'within':
res = tmpGeom.within(geom)
elif predicate == 'crosses':
res = tmpGeom.crosses(geom)
if res:
selectedSet.append(feat.id())
break
progress.setPercentage(int(current * total))
if 'disjoint' in predicates:
selectedSet = selectedSet + disjoinSet
features = vector.features(layer)
total = 100.0 / len(features)
for current, f in enumerate(features):
if f.id() in selectedSet:
writer.addFeature(f)
progress.setPercentage(int(current * total))
del writer