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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
149 lines
6.2 KiB
Python
149 lines
6.2 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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QgsFeatureRequest,
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QgsGeometry,
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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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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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