mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
96 lines
4.2 KiB
Python
96 lines
4.2 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Polygonize.py
|
|
---------------------
|
|
Date : March 2013
|
|
Copyright : (C) 2013 by Piotr Pociask
|
|
Email : ppociask at o2 dot pl
|
|
***************************************************************************
|
|
* *
|
|
* 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__ = 'Piotr Pociask'
|
|
__date__ = 'March 2013'
|
|
__copyright__ = '(C) 2013, Piotr Pociask'
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from PyQt4.QtCore import QVariant
|
|
from qgis.core import QgsFeature, QgsField, QgsFields, QgsGeometry, QGis
|
|
from processing.parameters.ParameterVector import ParameterVector
|
|
from processing.parameters.ParameterBoolean import ParameterBoolean
|
|
from processing.tools import dataobjects, vector
|
|
from processing.outputs.OutputVector import OutputVector
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
|
|
class Polygonize(GeoAlgorithm):
|
|
INPUT = "INPUT"
|
|
OUTPUT = "OUTPUT"
|
|
FIELDS = "FIELDS"
|
|
GEOMETRY = "GEOMETRY"
|
|
|
|
def processAlgorithm(self, progress):
|
|
try:
|
|
from shapely.ops import polygonize
|
|
from shapely.geometry import Point,MultiLineString
|
|
except ImportError:
|
|
raise GeoAlgorithmExecutionException('Polygonize algorithm requires shapely module!')
|
|
vlayer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
|
|
output = self.getOutputFromName(self.OUTPUT)
|
|
vprovider = vlayer.dataProvider()
|
|
if self.getParameterValue(self.FIELDS):
|
|
fields = vprovider.fields()
|
|
else:
|
|
fields = QgsFields()
|
|
if self.getParameterValue(self.GEOMETRY):
|
|
fieldsCount = fields.count()
|
|
fields.append(QgsField("area",QVariant.Double,"double",16,2))
|
|
fields.append(QgsField("perimeter",QVariant.Double,"double",16,2))
|
|
allLinesList = []
|
|
features = vector.features(vlayer)
|
|
current = 0
|
|
total = 40.0 / float(len(features))
|
|
for inFeat in features:
|
|
inGeom = inFeat.geometry()
|
|
if inGeom.isMultipart():
|
|
allLinesList.extend(inGeom.asMultiPolyline())
|
|
else:
|
|
allLinesList.append(inGeom.asPolyline())
|
|
current += 1
|
|
progress.setPercentage(int(current * total))
|
|
progress.setPercentage(40)
|
|
allLines = MultiLineString(allLinesList)
|
|
allLines = allLines.union(Point(0,0))
|
|
progress.setPercentage(45)
|
|
polygons = list(polygonize([allLines]))
|
|
progress.setPercentage(50)
|
|
writer = output.getVectorWriter(fields, QGis.WKBPolygon, vlayer.crs() )
|
|
outFeat = QgsFeature()
|
|
current = 0
|
|
total = 50.0 / float(len(polygons))
|
|
for polygon in polygons:
|
|
outFeat.setGeometry(QgsGeometry.fromWkt( polygon.wkt ))
|
|
if self.getParameterValue(self.GEOMETRY):
|
|
outFeat.setAttributes([None]*fieldsCount + [ polygon.area, polygon.length])
|
|
writer.addFeature(outFeat)
|
|
current += 1
|
|
progress.setPercentage(50+int(current * total))
|
|
del writer
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = "Polygonize"
|
|
self.group = "Vector geometry tools"
|
|
self.addParameter(ParameterVector(self.INPUT, "Input layer", [ParameterVector.VECTOR_TYPE_LINE]))
|
|
self.addParameter(ParameterBoolean(self.FIELDS, "Keep table structure of line layer", False))
|
|
self.addParameter(ParameterBoolean(self.GEOMETRY, "Create geometry columns", True))
|
|
self.addOutput(OutputVector(self.OUTPUT, "Output layer"))
|