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| 1 | +# -*- coding: utf-8 -*- |
| 2 | + |
| 3 | +""" |
| 4 | +*************************************************************************** |
| 5 | + PointsAlongGeometry.py |
| 6 | + --------------------- |
| 7 | + Date : August 2016 |
| 8 | + Copyright : (C) 2016 by Nyall Dawson |
| 9 | + Email : nyall dot dawson at gmail dot com |
| 10 | +*************************************************************************** |
| 11 | +* * |
| 12 | +* This program is free software; you can redistribute it and/or modify * |
| 13 | +* it under the terms of the GNU General Public License as published by * |
| 14 | +* the Free Software Foundation; either version 2 of the License, or * |
| 15 | +* (at your option) any later version. * |
| 16 | +* * |
| 17 | +*************************************************************************** |
| 18 | +""" |
| 19 | + |
| 20 | +__author__ = 'Nyall Dawson' |
| 21 | +__date__ = 'August 2016' |
| 22 | +__copyright__ = '(C) 2016, Nyall Dawson' |
| 23 | + |
| 24 | +# This will get replaced with a git SHA1 when you do a git archive |
| 25 | + |
| 26 | +__revision__ = '$Format:%H$' |
| 27 | + |
| 28 | +import os |
| 29 | +import math |
| 30 | + |
| 31 | +from qgis.PyQt.QtCore import QVariant |
| 32 | +from qgis.PyQt.QtGui import QIcon |
| 33 | + |
| 34 | +from qgis.core import QgsFeature, QgsGeometry, QgsWkbTypes, QgsField |
| 35 | + |
| 36 | +from processing.core.GeoAlgorithm import GeoAlgorithm |
| 37 | +from processing.core.parameters import ParameterVector, ParameterNumber |
| 38 | +from processing.core.outputs import OutputVector |
| 39 | +from processing.tools import dataobjects, vector |
| 40 | + |
| 41 | +pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0] |
| 42 | + |
| 43 | + |
| 44 | +class PointsAlongGeometry(GeoAlgorithm): |
| 45 | + |
| 46 | + INPUT = 'INPUT' |
| 47 | + OUTPUT = 'OUTPUT' |
| 48 | + DISTANCE = 'DISTANCE' |
| 49 | + START_OFFSET = 'START_OFFSET' |
| 50 | + END_OFFSET = 'END_OFFSET' |
| 51 | + |
| 52 | + def getIcon(self): |
| 53 | + return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'extract_nodes.png')) |
| 54 | + |
| 55 | + def defineCharacteristics(self): |
| 56 | + self.name, self.i18n_name = self.trAlgorithm('Points along lines') |
| 57 | + self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools') |
| 58 | + |
| 59 | + self.addParameter(ParameterVector(self.INPUT, |
| 60 | + self.tr('Input layer'), |
| 61 | + [ParameterVector.VECTOR_TYPE_POLYGON, ParameterVector.VECTOR_TYPE_LINE])) |
| 62 | + self.addParameter(ParameterNumber(self.DISTANCE, |
| 63 | + self.tr('Distance'), default=1.0)) |
| 64 | + self.addParameter(ParameterNumber(self.START_OFFSET, |
| 65 | + self.tr('Start offset'), default=0.0)) |
| 66 | + self.addParameter(ParameterNumber(self.END_OFFSET, |
| 67 | + self.tr('End offset'), default=0.0)) |
| 68 | + self.addOutput(OutputVector(self.OUTPUT, self.tr('Points'))) |
| 69 | + |
| 70 | + def processAlgorithm(self, progress): |
| 71 | + layer = dataobjects.getObjectFromUri( |
| 72 | + self.getParameterValue(self.INPUT)) |
| 73 | + distance = self.getParameterValue(self.DISTANCE) |
| 74 | + start_offset = self.getParameterValue(self.START_OFFSET) |
| 75 | + end_offset = self.getParameterValue(self.END_OFFSET) |
| 76 | + |
| 77 | + fields = layer.fields() |
| 78 | + fields.append(QgsField('distance', QVariant.Double)) |
| 79 | + fields.append(QgsField('angle', QVariant.Double)) |
| 80 | + |
| 81 | + writer = self.getOutputFromName(self.OUTPUT).getVectorWriter( |
| 82 | + fields, QgsWkbTypes.Point, layer.crs()) |
| 83 | + |
| 84 | + features = vector.features(layer) |
| 85 | + total = 100.0 / len(features) |
| 86 | + for current, input_feature in enumerate(features): |
| 87 | + input_geometry = input_feature.geometry() |
| 88 | + if not input_geometry: |
| 89 | + writer.addFeature(input_feature) |
| 90 | + else: |
| 91 | + if input_geometry.type == QgsWkbTypes.PolygonGeometry: |
| 92 | + length = input_geometry.geometry().perimeter() |
| 93 | + else: |
| 94 | + length = input_geometry.length() - end_offset |
| 95 | + current_distance = start_offset |
| 96 | + |
| 97 | + while current_distance <= length: |
| 98 | + point = input_geometry.interpolate(current_distance) |
| 99 | + angle = math.degrees(input_geometry.interpolateAngle(current_distance)) |
| 100 | + |
| 101 | + output_feature = QgsFeature() |
| 102 | + output_feature.setGeometry(point) |
| 103 | + attrs = input_feature.attributes() |
| 104 | + attrs.append(current_distance) |
| 105 | + attrs.append(angle) |
| 106 | + output_feature.setAttributes(attrs) |
| 107 | + writer.addFeature(output_feature) |
| 108 | + |
| 109 | + current_distance += distance |
| 110 | + |
| 111 | + progress.setPercentage(int(current * total)) |
| 112 | + |
| 113 | + del writer |
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