mirror of
https://github.com/qgis/QGIS.git
synced 2025-04-28 00:05:04 -04:00
f84d703234
Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
147 lines
5.9 KiB
Python
147 lines
5.9 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
OrientedMinimumBoundingBox.py
|
|
---------------------
|
|
Date : June 2015
|
|
Copyright : (C) 2015, Loïc BARTOLETTI
|
|
Email : coder at tuxfamily dot org
|
|
***************************************************************************
|
|
* *
|
|
* 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__ = 'Loïc BARTOLETTI'
|
|
__date__ = 'June 2015'
|
|
__copyright__ = '(C) 2015, Loïc BARTOLETTI'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsField,
|
|
QgsFields,
|
|
QgsGeometry,
|
|
QgsFeature,
|
|
QgsWkbTypes,
|
|
QgsFeatureRequest,
|
|
QgsApplication,
|
|
QgsProcessingUtils)
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterBoolean
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class OrientedMinimumBoundingBox(GeoAlgorithm):
|
|
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
BY_FEATURE = 'BY_FEATURE'
|
|
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QgsApplication.getThemeIcon("/providerQgis.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("providerQgis.svg")
|
|
|
|
def group(self):
|
|
return self.tr('Vector general tools')
|
|
|
|
def name(self):
|
|
return 'orientedminimumboundingbox'
|
|
|
|
def displayName(self):
|
|
return self.tr('Oriented minimum bounding box')
|
|
|
|
def defineCharacteristics(self):
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER,
|
|
self.tr('Input layer')))
|
|
self.addParameter(ParameterBoolean(self.BY_FEATURE,
|
|
self.tr('Calculate OMBB for each feature separately'), True))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Oriented_MBBox'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
|
|
|
|
def processAlgorithm(self, context, feedback):
|
|
layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
|
|
byFeature = self.getParameterValue(self.BY_FEATURE)
|
|
|
|
if byFeature and layer.geometryType() == QgsWkbTypes.PointGeometry and layer.featureCount() <= 2:
|
|
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"))
|
|
|
|
if byFeature:
|
|
fields = layer.fields()
|
|
else:
|
|
fields = QgsFields()
|
|
fields.append(QgsField('area', QVariant.Double))
|
|
fields.append(QgsField('perimeter', QVariant.Double))
|
|
fields.append(QgsField('angle', QVariant.Double))
|
|
fields.append(QgsField('width', QVariant.Double))
|
|
fields.append(QgsField('height', QVariant.Double))
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, QgsWkbTypes.Polygon, layer.crs(), context)
|
|
|
|
if byFeature:
|
|
self.featureOmbb(layer, context, writer, feedback)
|
|
else:
|
|
self.layerOmmb(layer, context, writer, feedback)
|
|
|
|
del writer
|
|
|
|
def layerOmmb(self, layer, context, writer, feedback):
|
|
req = QgsFeatureRequest().setSubsetOfAttributes([])
|
|
features = QgsProcessingUtils.getFeatures(layer, context, req)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
newgeometry = QgsGeometry()
|
|
first = True
|
|
for current, inFeat in enumerate(features):
|
|
if first:
|
|
newgeometry = inFeat.geometry()
|
|
first = False
|
|
else:
|
|
newgeometry = newgeometry.combine(inFeat.geometry())
|
|
feedback.setProgress(int(current * total))
|
|
|
|
geometry, area, angle, width, height = newgeometry.orientedMinimumBoundingBox()
|
|
|
|
if geometry:
|
|
outFeat = QgsFeature()
|
|
|
|
outFeat.setGeometry(geometry)
|
|
outFeat.setAttributes([area,
|
|
width * 2 + height * 2,
|
|
angle,
|
|
width,
|
|
height])
|
|
writer.addFeature(outFeat)
|
|
|
|
def featureOmbb(self, layer, context, writer, feedback):
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
outFeat = QgsFeature()
|
|
for current, inFeat in enumerate(features):
|
|
geometry, area, angle, width, height = inFeat.geometry().orientedMinimumBoundingBox()
|
|
if geometry:
|
|
outFeat.setGeometry(geometry)
|
|
attrs = inFeat.attributes()
|
|
attrs.extend([area,
|
|
width * 2 + height * 2,
|
|
angle,
|
|
width,
|
|
height])
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
else:
|
|
feedback.pushInfo(self.tr("Can't calculate an OMBB for feature {0}.").format(inFeat.id()))
|
|
feedback.setProgress(int(current * total))
|