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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
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.QgsProcessingUtils.mapLayerFromString(source, context)
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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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