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129 lines
4.8 KiB
Python
129 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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DensifyGeometries.py
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---------------------
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Date : October 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__ = 'October 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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from PyQt4.QtCore import *
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from qgis.core import *
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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.parameters import 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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class DensifyGeometries(GeoAlgorithm):
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INPUT = 'INPUT'
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VERTICES = 'VERTICES'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name = 'Densify geometries'
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self.group = 'Vector geometry tools'
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self.addParameter(ParameterVector(self.INPUT, 'Input layer',
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[ParameterVector.VECTOR_TYPE_POLYGON,
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ParameterVector.VECTOR_TYPE_LINE]))
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self.addParameter(ParameterNumber(self.VERTICES, 'Vertices to add', 1, 10000000, 1))
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self.addOutput(OutputVector(self.OUTPUT, 'Densified layer'))
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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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vertices = self.getParameterValue(self.VERTICES)
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isPolygon = layer.geometryType() == QGis.Polygon
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writer = self.getOutputFromName(
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self.OUTPUT).getVectorWriter(layer.pendingFields().toList(),
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layer.wkbType(), layer.crs())
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features = vector.features(layer)
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total = 100.0 / float(len(features))
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current = 0
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for f in features:
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featGeometry = QgsGeometry(f.geometry())
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attrs = f.attributes()
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newGeometry = self.densifyGeometry(featGeometry, int(vertices),
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isPolygon)
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feature = QgsFeature()
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feature.setGeometry(newGeometry)
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feature.setAttributes(attrs)
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writer.addFeature(feature)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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def densifyGeometry(self, geometry, pointsNumber, isPolygon):
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output = []
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if isPolygon:
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if geometry.isMultipart():
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polygons = geometry.asMultiPolygon()
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for poly in polygons:
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p = []
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for ring in poly:
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p.append(self.densify(ring, pointsNumber))
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output.append(p)
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return QgsGeometry.fromMultiPolygon(output)
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else:
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rings = geometry.asPolygon()
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for ring in rings:
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output.append(self.densify(ring, pointsNumber))
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return QgsGeometry.fromPolygon(output)
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else:
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if geometry.isMultipart():
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lines = geometry.asMultiPolyline()
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for points in lines:
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output.append(self.densify(points, pointsNumber))
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return QgsGeometry.fromMultiPolyline(output)
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else:
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points = geometry.asPolyline()
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output = self.densify(points, pointsNumber)
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return QgsGeometry.fromPolyline(output)
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def densify(self, polyline, pointsNumber):
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output = []
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if pointsNumber != 1:
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multiplier = 1.0 / float(pointsNumber + 1)
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else:
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multiplier = 1
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for i in xrange(len(polyline) - 1):
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p1 = polyline[i]
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p2 = polyline[i + 1]
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output.append(p1)
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for j in xrange(pointsNumber):
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delta = multiplier * (j + 1)
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x = p1.x() + delta * (p2.x() - p1.x())
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y = p1.y() + delta * (p2.y() - p1.y())
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output.append(QgsPoint(x, y))
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if j + 1 == pointsNumber:
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break
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output.append(polyline[len(polyline) - 1])
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return output
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