mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
134 lines
5.0 KiB
Python
134 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
SumLines.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 archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from PyQt4.QtCore import *
|
|
from qgis.core import *
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterString
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class SumLines(GeoAlgorithm):
|
|
|
|
LINES = 'LINES'
|
|
POLYGONS = 'POLYGONS'
|
|
LEN_FIELD = 'LEN_FIELD'
|
|
COUNT_FIELD = 'COUNT_FIELD'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
# =========================================================================
|
|
# def getIcon(self):
|
|
# return QIcon(os.path.dirname(__file__) + "/icons/sum_lines.png")
|
|
# =========================================================================
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = 'Sum line lengths'
|
|
self.group = 'Vector analysis tools'
|
|
|
|
self.addParameter(ParameterVector(self.LINES, 'Lines',
|
|
[ParameterVector.VECTOR_TYPE_LINE]))
|
|
self.addParameter(ParameterVector(self.POLYGONS, 'Polygons',
|
|
[ParameterVector.VECTOR_TYPE_POLYGON]))
|
|
self.addParameter(ParameterString(self.LEN_FIELD,
|
|
'Lines length field name', 'LENGTH'))
|
|
self.addParameter(ParameterString(self.COUNT_FIELD,
|
|
'Lines count field name', 'COUNT'))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT, 'Result'))
|
|
|
|
def processAlgorithm(self, progress):
|
|
lineLayer = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(self.LINES))
|
|
polyLayer = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(self.POLYGONS))
|
|
lengthFieldName = self.getParameterValue(self.LEN_FIELD)
|
|
countFieldName = self.getParameterValue(self.COUNT_FIELD)
|
|
|
|
polyProvider = polyLayer.dataProvider()
|
|
|
|
(idxLength, fieldList) = vector.findOrCreateField(polyLayer,
|
|
polyLayer.pendingFields(), lengthFieldName)
|
|
(idxCount, fieldList) = vector.findOrCreateField(polyLayer, fieldList,
|
|
countFieldName)
|
|
|
|
writer = self.getOutputFromName(
|
|
self.OUTPUT).getVectorWriter(fieldList.toList(),
|
|
polyProvider.geometryType(),
|
|
polyProvider.crs())
|
|
|
|
spatialIndex = vector.spatialindex(lineLayer)
|
|
|
|
ftLine = QgsFeature()
|
|
ftPoly = QgsFeature()
|
|
outFeat = QgsFeature()
|
|
inGeom = QgsGeometry()
|
|
outGeom = QgsGeometry()
|
|
distArea = QgsDistanceArea()
|
|
|
|
current = 0
|
|
features = vector.features(polyLayer)
|
|
total = 100.0 / float(len(features))
|
|
hasIntersections = False
|
|
for ftPoly in features:
|
|
inGeom = QgsGeometry(ftPoly.geometry())
|
|
attrs = ftPoly.attributes()
|
|
count = 0
|
|
length = 0
|
|
hasIntersections = False
|
|
lines = spatialIndex.intersects(inGeom.boundingBox())
|
|
if len(lines) > 0:
|
|
hasIntersections = True
|
|
|
|
if hasIntersections:
|
|
for i in lines:
|
|
request = QgsFeatureRequest().setFilterFid(i)
|
|
ftLine = lineLayer.getFeatures(request).next()
|
|
tmpGeom = QgsGeometry(ftLine.geometry())
|
|
if inGeom.intersects(tmpGeom):
|
|
outGeom = inGeom.intersection(tmpGeom)
|
|
length += distArea.measure(outGeom)
|
|
count += 1
|
|
|
|
outFeat.setGeometry(inGeom)
|
|
if idxLength == len(attrs):
|
|
attrs.append(length)
|
|
else:
|
|
attrs[idxLength] = length
|
|
if idxCount == len(attrs):
|
|
attrs.append(count)
|
|
else:
|
|
attrs[idxCount] = count
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
|
|
current += 1
|
|
progress.setPercentage(int(current * total))
|
|
|
|
del writer
|