mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
128 lines
4.7 KiB
Python
128 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
DensifyGeometries.py
|
|
---------------------
|
|
Date : October 2012
|
|
Copyright : (C) 2012 by Victor Olaya
|
|
Email : volayaf at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Victor Olaya'
|
|
__date__ = 'October 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
__revision__ = '$Format:%H$'
|
|
|
|
|
|
from PyQt4.QtCore import *
|
|
|
|
from qgis.core import *
|
|
|
|
from sextante.core.GeoAlgorithm import GeoAlgorithm
|
|
from sextante.core.QGisLayers import QGisLayers
|
|
|
|
from sextante.parameters.ParameterVector import ParameterVector
|
|
from sextante.parameters.ParameterNumber import ParameterNumber
|
|
|
|
from sextante.outputs.OutputVector import OutputVector
|
|
|
|
class DensifyGeometries(GeoAlgorithm):
|
|
|
|
INPUT = "INPUT"
|
|
VERTICES = "VERTICES"
|
|
OUTPUT = "OUTPUT"
|
|
|
|
#def getIcon(self):
|
|
# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/de.png")
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = "Densify geometries"
|
|
self.group = "Vector geometry tools"
|
|
|
|
self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
|
|
self.addParameter(ParameterNumber(self.VERTICES, "Vertices to add", 1, 10000000, 1))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT, "Densified layer"))
|
|
|
|
def processAlgorithm(self, progress):
|
|
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT))
|
|
vertices = self.getParameterValue(self.VERTICES)
|
|
|
|
isPolygon = layer.geometryType() == QGis.Polygon
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.pendingFields(),
|
|
layer.wkbType(), layer.crs())
|
|
|
|
features = QGisLayers.features(layer)
|
|
total = 100.0 / float(len(features))
|
|
current = 0
|
|
for f in features:
|
|
featGeometry = QgsGeometry(f.geometry())
|
|
attrMap = f.attributes()
|
|
newGeometry = self.densifyGeometry(featGeometry, int(vertices), isPolygon)
|
|
feature = QgsFeature()
|
|
feature.setGeometry(newGeometry)
|
|
feature.setAttributes(attrMap)
|
|
writer.addFeature(feature)
|
|
current += 1
|
|
progress.setPercentage(int(current * total))
|
|
|
|
del writer
|
|
|
|
def densifyGeometry(self, geometry, pointsNumber, isPolygon):
|
|
output = []
|
|
if isPolygon:
|
|
if geometry.isMultipart():
|
|
polygons = geometry.asMultiPolygon()
|
|
for poly in polygons:
|
|
p = []
|
|
for ring in poly:
|
|
p.append(self.densify(ring, pointsNumber))
|
|
output.append(p)
|
|
return QgsGeometry.fromMultiPolygon(output)
|
|
else:
|
|
rings = geometry.asPolygon()
|
|
for ring in rings:
|
|
output.append(self.densify(ring, pointsNumber))
|
|
return QgsGeometry.fromPolygon(output)
|
|
else:
|
|
if geometry.isMultipart():
|
|
lines = geometry.asMultiPolyline()
|
|
for points in lines:
|
|
output.append(self.densify(points, pointsNumber))
|
|
return QgsGeometry.fromMultiPolyline(output)
|
|
else:
|
|
points = geometry.asPolyline()
|
|
output = self.densify(points, pointsNumber)
|
|
return QgsGeometry.fromPolyline(output)
|
|
|
|
def densify(self, polyline, pointsNumber):
|
|
output = []
|
|
if pointsNumber != 1:
|
|
multiplier = 1.0 / float(pointsNumber + 1)
|
|
else:
|
|
multiplier = 1
|
|
for i in xrange(len(polyline) - 1):
|
|
p1 = polyline[i]
|
|
p2 = polyline[i + 1]
|
|
output.append(p1)
|
|
for j in xrange(pointsNumber):
|
|
delta = multiplier * (j + 1)
|
|
x = p1.x() + delta * (p2.x() - p1.x())
|
|
y = p1.y() + delta * (p2.y() - p1.y())
|
|
output.append(QgsPoint(x, y))
|
|
if j + 1 == pointsNumber:
|
|
break
|
|
output.append(polyline[len(polyline) - 1])
|
|
return output
|