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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
143 lines
5.8 KiB
Python
143 lines
5.8 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 qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsField,
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QgsFields,
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QgsFeatureSink,
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QgsGeometry,
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QgsFeature,
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QgsWkbTypes,
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QgsFeatureRequest,
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QgsApplication,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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
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class OrientedMinimumBoundingBox(QgisAlgorithm):
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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 group(self):
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return self.tr('Vector general tools')
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def __init__(self):
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super().__init__()
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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 name(self):
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return 'orientedminimumboundingbox'
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def displayName(self):
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return self.tr('Oriented minimum bounding box')
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def processAlgorithm(self, parameters, context, feedback):
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layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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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, QgsWkbTypes.Polygon, layer.crs(), context)
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if byFeature:
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self.featureOmbb(layer, context, writer, feedback)
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else:
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self.layerOmmb(layer, context, writer, feedback)
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del writer
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def layerOmmb(self, layer, context, writer, feedback):
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req = QgsFeatureRequest().setSubsetOfAttributes([])
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features = QgsProcessingUtils.getFeatures(layer, context, req)
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total = 100.0 / layer.featureCount() if layer.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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def featureOmbb(self, layer, context, writer, feedback):
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / layer.featureCount() if layer.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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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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