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220 lines
9.0 KiB
Python
220 lines
9.0 KiB
Python
"""
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***************************************************************************
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ExportGeometryInfo.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 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 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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import os
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import math
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from qgis.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import (NULL,
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Qgis,
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QgsApplication,
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QgsCoordinateTransform,
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QgsField,
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QgsFields,
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QgsWkbTypes,
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QgsPointXY,
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QgsFeatureSink,
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QgsDistanceArea,
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QgsProcessingUtils,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterEnum,
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QgsProcessingParameterFeatureSink,
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QgsUnitTypes)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ExportGeometryInfo(QgisAlgorithm):
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INPUT = 'INPUT'
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METHOD = 'CALC_METHOD'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmAddGeometryAttributes.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmAddGeometryAttributes.svg")
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def tags(self):
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return self.tr('export,add,information,measurements,areas,lengths,perimeters,latitudes,longitudes,x,y,z,extract,points,lines,polygons,sinuosity,fields').split(',')
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def group(self):
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return self.tr('Vector geometry')
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def groupId(self):
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return 'vectorgeometry'
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def __init__(self):
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super().__init__()
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self.export_z = False
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self.export_m = False
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self.distance_area = None
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self.distance_conversion_factor = 1
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self.area_conversion_factor = 1
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self.calc_methods = [self.tr('Layer CRS'),
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self.tr('Project CRS'),
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self.tr('Ellipsoidal')]
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterEnum(self.METHOD,
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self.tr('Calculate using'), options=self.calc_methods, defaultValue=0))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Added geom info')))
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def name(self):
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return 'exportaddgeometrycolumns'
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def displayName(self):
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return self.tr('Add geometry attributes')
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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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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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method = self.parameterAsEnum(parameters, self.METHOD, context)
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wkb_type = source.wkbType()
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fields = source.fields()
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new_fields = QgsFields()
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if QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.PolygonGeometry:
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new_fields.append(QgsField('area', QVariant.Double))
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new_fields.append(QgsField('perimeter', QVariant.Double))
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elif QgsWkbTypes.geometryType(wkb_type) == QgsWkbTypes.LineGeometry:
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new_fields.append(QgsField('length', QVariant.Double))
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if not QgsWkbTypes.isMultiType(source.wkbType()):
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new_fields.append(QgsField('straightdis', QVariant.Double))
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new_fields.append(QgsField('sinuosity', QVariant.Double))
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else:
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if QgsWkbTypes.isMultiType(source.wkbType()):
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new_fields.append(QgsField('numparts', QVariant.Int))
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else:
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new_fields.append(QgsField('xcoord', QVariant.Double))
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new_fields.append(QgsField('ycoord', QVariant.Double))
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if QgsWkbTypes.hasZ(source.wkbType()):
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self.export_z = True
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new_fields.append(QgsField('zcoord', QVariant.Double))
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if QgsWkbTypes.hasM(source.wkbType()):
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self.export_m = True
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new_fields.append(QgsField('mvalue', QVariant.Double))
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fields = QgsProcessingUtils.combineFields(fields, new_fields)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, wkb_type, source.sourceCrs())
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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coordTransform = None
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# Calculate with:
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# 0 - layer CRS
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# 1 - project CRS
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# 2 - ellipsoidal
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self.distance_area = QgsDistanceArea()
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if method == 2:
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self.distance_area.setSourceCrs(source.sourceCrs(), context.transformContext())
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self.distance_area.setEllipsoid(context.ellipsoid())
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self.distance_conversion_factor = QgsUnitTypes.fromUnitToUnitFactor(self.distance_area.lengthUnits(),
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context.distanceUnit())
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self.area_conversion_factor = QgsUnitTypes.fromUnitToUnitFactor(self.distance_area.areaUnits(),
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context.areaUnit())
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elif method == 1:
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if not context.project():
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raise QgsProcessingException(self.tr('No project is available in this context'))
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coordTransform = QgsCoordinateTransform(source.sourceCrs(), context.project().crs(), context.project())
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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, f in enumerate(features):
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if feedback.isCanceled():
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break
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outFeat = f
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attrs = f.attributes()
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inGeom = f.geometry()
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if inGeom:
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if coordTransform is not None:
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inGeom.transform(coordTransform)
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if inGeom.type() == QgsWkbTypes.PointGeometry:
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attrs.extend(self.point_attributes(inGeom))
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elif inGeom.type() == QgsWkbTypes.PolygonGeometry:
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attrs.extend(self.polygon_attributes(inGeom))
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else:
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attrs.extend(self.line_attributes(inGeom))
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# ensure consistent count of attributes - otherwise null
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# geometry features will have incorrect attribute length
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# and provider may reject them
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if len(attrs) < len(fields):
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attrs += [NULL] * (len(fields) - len(attrs))
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outFeat.setAttributes(attrs)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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def point_attributes(self, geometry):
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attrs = []
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if not geometry.isMultipart():
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pt = geometry.constGet()
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attrs.append(pt.x())
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attrs.append(pt.y())
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# add point z/m
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if self.export_z:
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attrs.append(pt.z())
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if self.export_m:
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attrs.append(pt.m())
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else:
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attrs = [geometry.constGet().numGeometries()]
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return attrs
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def line_attributes(self, geometry):
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if geometry.isMultipart():
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return [self.distance_area.measureLength(geometry)]
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else:
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curve = geometry.constGet()
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p1 = curve.startPoint()
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p2 = curve.endPoint()
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straight_distance = self.distance_conversion_factor * self.distance_area.measureLine(QgsPointXY(p1), QgsPointXY(p2))
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sinuosity = curve.sinuosity()
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if math.isnan(sinuosity):
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sinuosity = NULL
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return [self.distance_conversion_factor * self.distance_area.measureLength(geometry), straight_distance, sinuosity]
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def polygon_attributes(self, geometry):
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area = self.area_conversion_factor * self.distance_area.measureArea(geometry)
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perimeter = self.distance_conversion_factor * self.distance_area.measurePerimeter(geometry)
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return [area, perimeter]
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