mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-06 00:05:02 -05:00
82 lines
3.0 KiB
Python
82 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Centroids.py
|
|
---------------------
|
|
Date : August 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__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
# This will get replaced with a git SHA1 when you do a git archive323
|
|
__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.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
|
|
from sextante.parameters.ParameterVector import ParameterVector
|
|
from sextante.outputs.OutputVector import OutputVector
|
|
|
|
class Centroids(GeoAlgorithm):
|
|
|
|
INPUT_LAYER = "INPUT_LAYER"
|
|
OUTPUT_LAYER = "OUTPUT_LAYER"
|
|
|
|
#===========================================================================
|
|
# def getIcon(self):
|
|
# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/centroids.png")
|
|
#===========================================================================
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = "Polygon centroids"
|
|
self.group = "Vector geometry tools"
|
|
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_POLYGON))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer"))
|
|
|
|
def processAlgorithm(self, progress):
|
|
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT_LAYER).getVectorWriter(layer.pendingFields().toList(),
|
|
QGis.WKBPoint, layer.crs())
|
|
|
|
outFeat = QgsFeature()
|
|
|
|
features = QGisLayers.features(layer)
|
|
total = 100.0 / float(len(features))
|
|
current = 0
|
|
|
|
for inFeat in features:
|
|
inGeom = inFeat.geometry()
|
|
attrs = inFeat.attributes()
|
|
|
|
outGeom = QgsGeometry(inGeom.centroid())
|
|
if outGeom is None:
|
|
raise GeoAlgorithmExecutionException("Error calculating centroid")
|
|
|
|
outFeat.setGeometry(outGeom)
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
current += 1
|
|
progress.setPercentage(int(current * total))
|
|
|
|
del writer
|