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156 lines
6.5 KiB
Python
156 lines
6.5 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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QgsPoint,
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QgsCoordinateReferenceSystem,
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QgsFeatureRequest,
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QgsGeometry,
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QgsProcessingUtils,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterCrs,
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QgsProcessingOutputVectorLayer,
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QgsProcessingParameterField)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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
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class PointsLayerFromTable(QgisAlgorithm):
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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 __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'), types=[QgsProcessingParameterField.TypeTable]))
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self.addParameter(QgsProcessingParameterField(self.XFIELD,
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self.tr('X field'), parentLayerParameterName=self.INPUT, type=QgsProcessingParameterField.Any))
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self.addParameter(QgsProcessingParameterField(self.YFIELD,
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self.tr('Y field'), parentLayerParameterName=self.INPUT, type=QgsProcessingParameterField.Any))
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self.addParameter(QgsProcessingParameterField(self.ZFIELD,
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self.tr('Z field'), parentLayerParameterName=self.INPUT, type=QgsProcessingParameterField.Any, optional=True))
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self.addParameter(QgsProcessingParameterField(self.MFIELD,
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self.tr('M field'), parentLayerParameterName=self.INPUT, type=QgsProcessingParameterField.Any, optional=True))
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self.addParameter(QgsProcessingParameterCrs(self.TARGET_CRS,
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self.tr('Target CRS'), defaultValue='EPSG:4326'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Points from table'), type=QgsProcessingParameterDefinition.TypeVectorPoint))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Points from table'), type=QgsProcessingParameterDefinition.TypeVectorPoint))
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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 processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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fields = source.fields()
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x_field_index = fields.lookupField(self.parameterAsString(parameters, self.XFIELD, context))
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y_field_index = fields.lookupField(self.parameterAsString(parameters, self.YFIELD, context))
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z_field_index = -1
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if self.parameterAsString(parameters, self.ZFIELD, context):
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z_field_index = fields.lookupField(self.parameterAsString(parameters, self.ZFIELD, context))
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m_field_index = -1
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if self.parameterAsString(parameters, self.MFIELD, context):
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m_field_index = fields.lookupField(self.parameterAsString(parameters, self.MFIELD, context))
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wkb_type = QgsWkbTypes.Point
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if z_field_index >= 0:
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wkb_type = QgsWkbTypes.addZ(wkb_type)
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if m_field_index >= 0:
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wkb_type = QgsWkbTypes.addM(wkb_type)
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target_crs = self.parameterAsCrs(parameters, self.TARGET_CRS, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, wkb_type, target_crs)
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request = QgsFeatureRequest().setFlags(QgsFeatureRequest.NoGeometry)
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, feature in enumerate(features):
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if feedback.isCanceled():
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break
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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 = QgsPoint(x, y)
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if z_field_index >= 0:
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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 >= 0:
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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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sink.addFeature(feature)
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return {self.OUTPUT: dest_id}
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