mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-03 00:02:25 -05:00
1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
145 lines
5.9 KiB
Python
145 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,
|
|
QgsFeatureSink,
|
|
QgsGeometry,
|
|
QgsFeature,
|
|
QgsWkbTypes,
|
|
QgsFeatureRequest,
|
|
QgsApplication,
|
|
QgsProcessingUtils)
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
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
|
|
|
|
|
|
class OrientedMinimumBoundingBox(QgisAlgorithm):
|
|
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
BY_FEATURE = 'BY_FEATURE'
|
|
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def group(self):
|
|
return self.tr('Vector general tools')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
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 name(self):
|
|
return 'orientedminimumboundingbox'
|
|
|
|
def displayName(self):
|
|
return self.tr('Oriented minimum bounding box')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
layer = 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 / layer.featureCount() if layer.featureCount() else 0
|
|
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, QgsFeatureSink.FastInsert)
|
|
|
|
def featureOmbb(self, layer, context, writer, feedback):
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / layer.featureCount() if layer.featureCount() else 0
|
|
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, QgsFeatureSink.FastInsert)
|
|
else:
|
|
feedback.pushInfo(self.tr("Can't calculate an OMBB for feature {0}.").format(inFeat.id()))
|
|
feedback.setProgress(int(current * total))
|