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ede452be85
Algorithms are now passed a QgsProcessingFeedback object instead of the loosely defined progress parameter.
156 lines
5.7 KiB
Python
156 lines
5.7 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 Qgis, QgsProject, QgsCoordinateTransform, QgsFeature, QgsGeometry, QgsField, QgsWkbTypes
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from qgis.utils import iface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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 dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ExportGeometryInfo(GeoAlgorithm):
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INPUT = 'INPUT'
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METHOD = 'CALC_METHOD'
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OUTPUT = 'OUTPUT'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'export_geometry.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Export/Add geometry columns')
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self.group, self.i18n_group = self.trAlgorithm('Vector table tools')
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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 processAlgorithm(self, feedback):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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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(
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fields.toList(), layer.wkbType(), layer.crs())
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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().readEntry('Measure', '/Ellipsoid',
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'NONE')[0]
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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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inGeom = QgsGeometry()
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outFeat.initAttributes(len(fields))
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outFeat.setFields(fields)
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features = vector.features(layer)
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total = 100.0 / len(features)
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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)
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feedback.setProgress(int(current * total))
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del writer
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