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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
140 lines
5.5 KiB
Python
140 lines
5.5 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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QgsFeatureSink,
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QgsCoordinateReferenceSystem,
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QgsGeometry,
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QgsProcessingUtils)
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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 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(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 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.getParameterValue(self.INPUT)
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vlayer = 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 / vlayer.featureCount() if vlayer.featureCount() else 0
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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 = QgsPoint(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, QgsFeatureSink.FastInsert)
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del writer
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