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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
151 lines
6.2 KiB
Python
151 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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QgsProcessing,
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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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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'), types=[QgsProcessing.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=QgsProcessing.TypeVectorPoint))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Points from table'), type=QgsProcessing.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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