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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.
165 lines
6.0 KiB
Python
165 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ExportGeometryInfo.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import QgsProject, QgsCoordinateTransform, QgsFeature, QgsField, QgsWkbTypes, QgsFeatureSink, QgsProcessingUtils
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from qgis.utils import iface
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterSelection
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from processing.core.outputs import OutputVector
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from processing.tools import vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ExportGeometryInfo(QgisAlgorithm):
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INPUT = 'INPUT'
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METHOD = 'CALC_METHOD'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'export_geometry.png'))
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def tags(self):
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return self.tr('export,measurements,areas,lengths,perimeters,latitudes,longitudes,x,y,z,extract,points,lines,polygons').split(',')
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def group(self):
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return self.tr('Vector table tools')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.calc_methods = [self.tr('Layer CRS'),
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self.tr('Project CRS'),
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self.tr('Ellipsoidal')]
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterSelection(self.METHOD,
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self.tr('Calculate using'), self.calc_methods, 0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Added geom info')))
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def name(self):
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return 'exportaddgeometrycolumns'
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def displayName(self):
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return self.tr('Export/Add geometry columns')
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def processAlgorithm(self, parameters, context, feedback):
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layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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method = self.getParameterValue(self.METHOD)
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geometryType = layer.geometryType()
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fields = layer.fields()
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export_z = False
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export_m = False
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if geometryType == QgsWkbTypes.PolygonGeometry:
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areaName = vector.createUniqueFieldName('area', fields)
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fields.append(QgsField(areaName, QVariant.Double))
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perimeterName = vector.createUniqueFieldName('perimeter', fields)
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fields.append(QgsField(perimeterName, QVariant.Double))
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elif geometryType == QgsWkbTypes.LineGeometry:
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lengthName = vector.createUniqueFieldName('length', fields)
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fields.append(QgsField(lengthName, QVariant.Double))
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else:
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xName = vector.createUniqueFieldName('xcoord', fields)
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fields.append(QgsField(xName, QVariant.Double))
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yName = vector.createUniqueFieldName('ycoord', fields)
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fields.append(QgsField(yName, QVariant.Double))
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if QgsWkbTypes.hasZ(layer.wkbType()):
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export_z = True
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zName = vector.createUniqueFieldName('zcoord', fields)
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fields.append(QgsField(zName, QVariant.Double))
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if QgsWkbTypes.hasM(layer.wkbType()):
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export_m = True
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zName = vector.createUniqueFieldName('mvalue', fields)
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fields.append(QgsField(zName, QVariant.Double))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, layer.wkbType(), layer.crs(),
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context)
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ellips = None
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crs = None
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coordTransform = None
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# Calculate with:
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# 0 - layer CRS
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# 1 - project CRS
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# 2 - ellipsoidal
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if method == 2:
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ellips = QgsProject.instance().ellipsoid()
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crs = layer.crs().srsid()
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elif method == 1:
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mapCRS = iface.mapCanvas().mapSettings().destinationCrs()
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layCRS = layer.crs()
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coordTransform = QgsCoordinateTransform(layCRS, mapCRS)
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outFeat = QgsFeature()
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outFeat.initAttributes(len(fields))
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outFeat.setFields(fields)
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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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for current, f in enumerate(features):
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inGeom = f.geometry()
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if method == 1:
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inGeom.transform(coordTransform)
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(attr1, attr2) = vector.simpleMeasure(inGeom, method, ellips, crs)
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outFeat.setGeometry(inGeom)
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attrs = f.attributes()
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attrs.append(attr1)
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if attr2 is not None:
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attrs.append(attr2)
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# add point z/m
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if export_z:
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attrs.append(inGeom.geometry().z())
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if export_m:
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attrs.append(inGeom.geometry().m())
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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