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114 lines
4.5 KiB
Python
114 lines
4.5 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsAlongGeometry.py
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---------------------
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Date : August 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'August 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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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.QtCore import QVariant
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from qgis.PyQt.QtGui import QIcon
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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, ParameterNumber
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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 PointsAlongGeometry(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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DISTANCE = 'DISTANCE'
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START_OFFSET = 'START_OFFSET'
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END_OFFSET = 'END_OFFSET'
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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('Points along lines')
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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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[ParameterVector.VECTOR_TYPE_POLYGON, ParameterVector.VECTOR_TYPE_LINE]))
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self.addParameter(ParameterNumber(self.DISTANCE,
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self.tr('Distance'), default=1.0))
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self.addParameter(ParameterNumber(self.START_OFFSET,
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self.tr('Start offset'), default=0.0))
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self.addParameter(ParameterNumber(self.END_OFFSET,
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self.tr('End offset'), default=0.0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Points')))
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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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distance = self.getParameterValue(self.DISTANCE)
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start_offset = self.getParameterValue(self.START_OFFSET)
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end_offset = self.getParameterValue(self.END_OFFSET)
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fields = layer.fields()
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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, input_feature in enumerate(features):
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input_geometry = input_feature.geometry()
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if not input_geometry:
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writer.addFeature(input_feature)
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else:
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if input_geometry.type == QgsWkbTypes.PolygonGeometry:
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length = input_geometry.geometry().perimeter()
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else:
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length = input_geometry.length() - end_offset
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current_distance = start_offset
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while current_distance <= length:
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point = input_geometry.interpolate(current_distance)
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angle = math.degrees(input_geometry.interpolateAngle(current_distance))
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output_feature = QgsFeature()
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output_feature.setGeometry(point)
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attrs = input_feature.attributes()
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attrs.append(current_distance)
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attrs.append(angle)
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output_feature.setAttributes(attrs)
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writer.addFeature(output_feature)
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current_distance += distance
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progress.setPercentage(int(current * total))
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del writer
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