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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
144 lines
5.6 KiB
Python
144 lines
5.6 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 (QgsApplication,
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QgsWkbTypes,
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QgsPointV2,
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QgsCoordinateReferenceSystem,
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QgsGeometry,
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QgsProcessingUtils)
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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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ZFIELD = 'ZFIELD'
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MFIELD = 'MFIELD'
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OUTPUT = 'OUTPUT'
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TARGET_CRS = 'TARGET_CRS'
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def tags(self):
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return self.tr('points,create,values,attributes').split(',')
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def group(self):
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return self.tr('Vector creation tools')
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def name(self):
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return 'createpointslayerfromtable'
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def displayName(self):
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return self.tr('Create points layer from table')
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def defineCharacteristics(self):
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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(ParameterTableField(self.ZFIELD,
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self.tr('Z field'), self.INPUT, datatype=ParameterTableField.DATA_TYPE_ANY, optional=True))
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self.addParameter(ParameterTableField(self.MFIELD,
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self.tr('M field'), self.INPUT, datatype=ParameterTableField.DATA_TYPE_ANY, optional=True))
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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'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
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def processAlgorithm(self, context, feedback):
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source = self.getParameterValue(self.INPUT)
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vlayer = dataobjects.getLayerFromString(source)
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output = self.getOutputFromName(self.OUTPUT)
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fields = vlayer.fields()
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x_field_index = fields.lookupField(self.getParameterValue(self.XFIELD))
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y_field_index = fields.lookupField(self.getParameterValue(self.YFIELD))
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z_field_index = None
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if self.getParameterValue(self.ZFIELD):
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z_field_index = fields.lookupField(self.getParameterValue(self.ZFIELD))
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m_field_index = None
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if self.getParameterValue(self.MFIELD):
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m_field_index = fields.lookupField(self.getParameterValue(self.MFIELD))
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wkb_type = QgsWkbTypes.Point
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if z_field_index is not None:
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wkb_type = QgsWkbTypes.addZ(wkb_type)
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if m_field_index is not None:
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wkb_type = QgsWkbTypes.addM(wkb_type)
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crsId = self.getParameterValue(self.TARGET_CRS)
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target_crs = QgsCoordinateReferenceSystem()
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target_crs.createFromUserInput(crsId)
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writer = output.getVectorWriter(fields, wkb_type, target_crs, context)
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features = QgsProcessingUtils.getFeatures(vlayer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(vlayer, context)
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for current, feature in enumerate(features):
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feedback.setProgress(int(current * total))
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attrs = feature.attributes()
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try:
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x = float(attrs[x_field_index])
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y = float(attrs[y_field_index])
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point = QgsPointV2(x, y)
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if z_field_index is not None:
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try:
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point.addZValue(float(attrs[z_field_index]))
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except:
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point.addZValue(0.0)
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if m_field_index is not None:
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try:
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point.addMValue(float(attrs[m_field_index]))
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except:
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point.addMValue(0.0)
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feature.setGeometry(QgsGeometry(point))
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except:
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pass # no geometry
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writer.addFeature(feature)
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del writer
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