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139 lines
4.8 KiB
Python
139 lines
4.8 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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from PyQt4.QtCore import *
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from qgis.core import *
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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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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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CALC_METHODS = ['Layer CRS', 'Project CRS', 'Ellipsoidal']
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#==========================================================================
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#def getIcon(self):
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# return QIcon(os.path.dirname(__file__) + "/icons/export_geometry.png")
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#=========================================================================
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def defineCharacteristics(self):
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self.name = 'Export/Add geometry columns'
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self.group = 'Vector table tools'
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self.addParameter(ParameterVector(self.INPUT, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterSelection(self.METHOD, 'Calculate using',
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self.CALC_METHODS, 0))
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self.addOutput(OutputVector(self.OUTPUT, 'Output layer'))
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def processAlgorithm(self, progress):
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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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idx1 = -1
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idx2 = -1
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fields = layer.pendingFields()
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if geometryType == QGis.Polygon:
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(idx1, fields) = vector.findOrCreateField(layer, fields, 'area',
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21, 6)
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(idx2, fields) = vector.findOrCreateField(layer, fields,
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'perimeter', 21, 6)
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elif geometryType == QGis.Line:
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(idx1, fields) = vector.findOrCreateField(layer, fields, 'length',
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21, 6)
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idx2 = idx1
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else:
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(idx1, fields) = vector.findOrCreateField(layer, fields, 'xcoord',
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21, 6)
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(idx2, fields) = vector.findOrCreateField(layer, fields, 'ycoord',
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21, 6)
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writer = self.getOutputFromName(
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self.OUTPUT).getVectorWriter(fields.toList(),
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layer.dataProvider().geometryType(), 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().mapRenderer().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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current = 0
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features = vector.features(layer)
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total = 100.0 / float(len(features))
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for f in 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.insert(idx1, attr1)
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if attr2 is not None:
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attrs.insert(idx2, attr2)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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