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ede452be85
Algorithms are now passed a QgsProcessingFeedback object instead of the loosely defined progress parameter.
131 lines
5.4 KiB
Python
131 lines
5.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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OrientedMinimumBoundingBox.py
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---------------------
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Date : June 2015
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Copyright : (C) 2015, Loïc BARTOLETTI
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Email : coder at tuxfamily dot org
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Loïc BARTOLETTI'
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__date__ = 'June 2015'
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__copyright__ = '(C) 2015, Loïc BARTOLETTI'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from math import degrees, atan2
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import Qgis, QgsField, QgsFields, QgsPoint, QgsGeometry, QgsFeature, QgsWkbTypes, QgsFeatureRequest
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterBoolean
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class OrientedMinimumBoundingBox(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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BY_FEATURE = 'BY_FEATURE'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Oriented minimum bounding box')
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self.group, self.i18n_group = self.trAlgorithm('Vector general tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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self.addParameter(ParameterBoolean(self.BY_FEATURE,
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self.tr('Calculate OMBB for each feature separately'), True))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Oriented_MBBox'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, feedback):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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byFeature = self.getParameterValue(self.BY_FEATURE)
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if byFeature and layer.geometryType() == QgsWkbTypes.PointGeometry and layer.featureCount() <= 2:
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raise GeoAlgorithmExecutionException(self.tr("Can't calculate an OMBB for each point, it's a point. The number of points must be greater than 2"))
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if byFeature:
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fields = layer.fields()
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else:
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fields = QgsFields()
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fields.append(QgsField('area', QVariant.Double))
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fields.append(QgsField('perimeter', QVariant.Double))
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fields.append(QgsField('angle', QVariant.Double))
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fields.append(QgsField('width', QVariant.Double))
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fields.append(QgsField('height', QVariant.Double))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
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QgsWkbTypes.Polygon, layer.crs())
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if byFeature:
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self.featureOmbb(layer, writer, feedback)
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else:
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self.layerOmmb(layer, writer, feedback)
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del writer
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def layerOmmb(self, layer, writer, feedback):
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req = QgsFeatureRequest().setSubsetOfAttributes([])
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features = vector.features(layer, req)
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total = 100.0 / len(features)
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newgeometry = QgsGeometry()
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first = True
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for current, inFeat in enumerate(features):
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if first:
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newgeometry = inFeat.geometry()
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first = False
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else:
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newgeometry = newgeometry.combine(inFeat.geometry())
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feedback.setProgress(int(current * total))
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geometry, area, angle, width, height = newgeometry.orientedMinimumBoundingBox()
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if geometry:
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outFeat = QgsFeature()
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outFeat.setGeometry(geometry)
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outFeat.setAttributes([area,
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width * 2 + height * 2,
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angle,
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width,
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height])
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writer.addFeature(outFeat)
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def featureOmbb(self, layer, writer, feedback):
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features = vector.features(layer)
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total = 100.0 / len(features)
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outFeat = QgsFeature()
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for current, inFeat in enumerate(features):
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geometry, area, angle, width, height = inFeat.geometry().orientedMinimumBoundingBox()
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if geometry:
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outFeat.setGeometry(geometry)
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attrs = inFeat.attributes()
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attrs.extend([area,
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width * 2 + height * 2,
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angle,
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width,
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height])
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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else:
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feedback.pushInfo(self.tr("Can't calculate an OMBB for feature {0}.").format(inFeat.id()))
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feedback.setProgress(int(current * total))
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