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99 lines
3.7 KiB
Python
99 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ExtractNodes.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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# 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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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 QgsFeature, QgsGeometry, QgsWkbTypes, QgsField
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class ExtractNodes(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'extract_nodes.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Extract nodes')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'),
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[dataobjects.TYPE_VECTOR_POLYGON,
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dataobjects.TYPE_VECTOR_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Nodes'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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fields = layer.fields()
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fields.append(QgsField('node_index', QVariant.Int))
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fields.append(QgsField('distance', QVariant.Double))
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fields.append(QgsField('angle', QVariant.Double))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QgsWkbTypes.Point, layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, f in enumerate(features):
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input_geometry = f.geometry()
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if not input_geometry:
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writer.addFeature(f)
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else:
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points = vector.extractPoints(input_geometry)
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for i, point in enumerate(points):
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distance = input_geometry.distanceToVertex(i)
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angle = math.degrees(input_geometry.angleAtVertex(i))
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attrs = f.attributes()
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attrs.append(i)
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attrs.append(distance)
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attrs.append(angle)
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output_feature = QgsFeature()
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output_feature.setAttributes(attrs)
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output_feature.setGeometry(QgsGeometry.fromPoint(point))
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writer.addFeature(output_feature)
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progress.setPercentage(int(current * total))
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del writer
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