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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
93 lines
3.8 KiB
Python
93 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsLayerFromTable.py
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---------------------
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Date : January 2013
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Copyright : (C) 2013 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 2013'
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__copyright__ = '(C) 2013, 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 qgis.core import Qgis, QgsWkbTypes
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from qgis.core import QgsCoordinateReferenceSystem
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from qgis.core import QgsFeature
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from qgis.core import QgsGeometry
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from qgis.core import QgsPoint
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterTable
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from processing.core.parameters import ParameterTableField
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from processing.core.parameters import ParameterCrs
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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 PointsLayerFromTable(GeoAlgorithm):
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INPUT = 'INPUT'
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XFIELD = 'XFIELD'
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YFIELD = 'YFIELD'
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OUTPUT = 'OUTPUT'
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TARGET_CRS = 'TARGET_CRS'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Points layer from table')
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self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
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self.addParameter(ParameterTable(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.XFIELD,
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self.tr('X field'), self.INPUT, ParameterTableField.DATA_TYPE_ANY))
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self.addParameter(ParameterTableField(self.YFIELD,
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self.tr('Y field'), self.INPUT, ParameterTableField.DATA_TYPE_ANY))
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self.addParameter(ParameterCrs(self.TARGET_CRS,
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self.tr('Target CRS'), 'EPSG:4326'))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Points from table')))
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def processAlgorithm(self, progress):
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source = self.getParameterValue(self.INPUT)
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vlayer = dataobjects.getObjectFromUri(source)
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output = self.getOutputFromName(self.OUTPUT)
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fields = vlayer.fields()
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writer = output.getVectorWriter(fields, QgsWkbTypes.Point, self.crs)
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xfieldindex = vlayer.fieldNameIndex(self.getParameterValue(self.XFIELD))
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yfieldindex = vlayer.fieldNameIndex(self.getParameterValue(self.YFIELD))
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crsId = self.getParameterValue(self.TARGET_CRS)
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targetCrs = QgsCoordinateReferenceSystem()
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targetCrs.createFromUserInput(crsId)
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self.crs = targetCrs
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outFeat = QgsFeature()
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features = vector.features(vlayer)
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total = 100.0 / len(features)
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for current, feature in enumerate(features):
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progress.setPercentage(int(current * total))
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attrs = feature.attributes()
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try:
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x = float(attrs[xfieldindex])
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y = float(attrs[yfieldindex])
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except:
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continue
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pt = QgsPoint(x, y)
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outFeat.setGeometry(QgsGeometry.fromPoint(pt))
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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del writer
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