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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
177 lines
6.6 KiB
Python
177 lines
6.6 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, QgsPoint, QgsGeometry, QgsFeature, QgsWkbTypes
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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'), [ParameterVector.VECTOR_TYPE_ANY]))
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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')))
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def processAlgorithm(self, progress):
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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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fields = [
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QgsField('AREA', QVariant.Double),
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QgsField('PERIMETER', QVariant.Double),
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QgsField('ANGLE', QVariant.Double),
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QgsField('WIDTH', QVariant.Double),
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QgsField('HEIGHT', QVariant.Double),
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]
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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, progress)
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else:
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self.layerOmmb(layer, writer, progress)
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del writer
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def layerOmmb(self, layer, writer, progress):
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current = 0
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fit = layer.getFeatures()
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inFeat = QgsFeature()
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total = 100.0 / layer.featureCount()
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newgeometry = QgsGeometry()
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first = True
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while fit.nextFeature(inFeat):
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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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current += 1
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progress.setPercentage(int(current * total))
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geometry, area, perim, angle, width, height = self.OMBBox(newgeometry)
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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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perim,
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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, progress):
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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, perim, angle, width, height = self.OMBBox(
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inFeat.geometry())
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if geometry:
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outFeat.setGeometry(geometry)
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outFeat.setAttributes([area,
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perim,
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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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else:
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progress.setInfo(self.tr("Can't calculate an OMBB for feature {0}.").format(inFeat.id()))
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progress.setPercentage(int(current * total))
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def GetAngleOfLineBetweenTwoPoints(self, p1, p2, angle_unit="degrees"):
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xDiff = p2.x() - p1.x()
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yDiff = p2.y() - p1.y()
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if angle_unit == "radians":
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return atan2(yDiff, xDiff)
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else:
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return degrees(atan2(yDiff, xDiff))
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def OMBBox(self, geom):
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g = geom.convexHull()
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if g.type() != QgsWkbTypes.PolygonGeometry:
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return None, None, None, None, None, None
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r = g.asPolygon()[0]
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p0 = QgsPoint(r[0][0], r[0][1])
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i = 0
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l = len(r)
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OMBBox = QgsGeometry()
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gBBox = g.boundingBox()
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OMBBox_area = gBBox.height() * gBBox.width()
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OMBBox_angle = 0
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OMBBox_width = 0
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OMBBox_heigth = 0
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OMBBox_perim = 0
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while i < l - 1:
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x = QgsGeometry(g)
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angle = self.GetAngleOfLineBetweenTwoPoints(r[i], r[i + 1])
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x.rotate(angle, p0)
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bbox = x.boundingBox()
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bb = QgsGeometry.fromWkt(bbox.asWktPolygon())
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bb.rotate(-angle, p0)
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areabb = bb.area()
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if areabb <= OMBBox_area:
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OMBBox = QgsGeometry(bb)
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OMBBox_area = areabb
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OMBBox_angle = angle
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OMBBox_width = bbox.width()
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OMBBox_heigth = bbox.height()
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OMBBox_perim = 2 * OMBBox_width + 2 * OMBBox_heigth
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i += 1
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return OMBBox, OMBBox_area, OMBBox_perim, OMBBox_angle, OMBBox_width, OMBBox_heigth
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