91 lines
4.1 KiB
Python

from sextante.core.GeoAlgorithm import GeoAlgorithm
import os.path
from PyQt4 import QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from sextante.parameters.ParameterVector import ParameterVector
from sextante.core.QGisLayers import QGisLayers
from sextante.outputs.OutputVector import OutputVector
from sextante.core.SextanteLog import SextanteLog
from sextante.ftools import ftools_utils
from sextante.parameters.ParameterString import ParameterString
from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
class SumLines(GeoAlgorithm):
LINES = "LINES"
POLYGONS = "POLYGONS"
FIELD = "FIELD"
OUTPUT = "OUTPUT"
def getIcon(self):
return QtGui.QIcon(os.path.dirname(__file__) + "/icons/sum_lines.png")
def processAlgorithm(self, progress):
inField = self.getParameterValue(SumLines.FIELD)
lineLayer = QGisLayers.getObjectFromUri(self.getParameterValue(SumLines.LINES))
polyLayer = QGisLayers.getObjectFromUri(self.getParameterValue(SumLines.POLYGONS))
polyProvider = polyLayer.dataProvider()
lineProvider = lineLayer.dataProvider()
if polyProvider.crs() <> lineProvider.crs():
SextanteLog.addToLog(SextanteLog.LOG_WARNING,
"CRS warning!Warning: Input layers have non-matching CRS.\nThis may cause unexpected results.")
allAttrs = polyProvider.attributeIndexes()
polyProvider.select(allAttrs)
allAttrs = lineProvider.attributeIndexes()
lineProvider.select(allAttrs)
fieldList = ftools_utils.getFieldList(polyLayer)
index = polyProvider.fieldNameIndex(unicode(inField))
if index == -1:
index = polyProvider.fieldCount()
field = QgsField(unicode(inField), QVariant.Double, "real", 24, 15, self.tr("length field"))
fieldList[index] = field
sRs = polyProvider.crs()
inFeat = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
distArea = QgsDistanceArea()
lineProvider.rewind()
start = 15.00
add = 85.00 / polyProvider.featureCount()
writer = self.getOutputFromName(SumLines.OUTPUT).getVectorWriter(fieldList, polyProvider.geometryType(), sRs)
spatialIndex = ftools_utils.createIndex( lineProvider )
while polyProvider.nextFeature(inFeat):
inGeom = QgsGeometry(inFeat.geometry())
atMap = inFeat.attributeMap()
lineList = []
length = 0
#(check, lineList) = lineLayer.featuresInRectangle(inGeom.boundingBox(), True, False)
#lineLayer.select(inGeom.boundingBox(), False)
#lineList = lineLayer.selectedFeatures()
lineList = spatialIndex.intersects(inGeom.boundingBox())
if len(lineList) > 0: check = 0
else: check = 1
if check == 0:
for i in lineList:
lineProvider.featureAtId( int( i ), inFeatB , True, allAttrs )
tmpGeom = QgsGeometry( inFeatB.geometry() )
if inGeom.intersects(tmpGeom):
outGeom = inGeom.intersection(tmpGeom)
length = length + distArea.measure(outGeom)
outFeat.setGeometry(inGeom)
outFeat.setAttributeMap(atMap)
outFeat.addAttribute(index, QVariant(length))
writer.addFeature(outFeat)
start = start + add
progress.setPercentage(start)
del writer
def defineCharacteristics(self):
self.name = "Sum line lengths"
self.group = "Analysis tools"
self.addParameter(ParameterVector(SumLines.LINES, "Lines", ParameterVector.VECTOR_TYPE_LINE))
self.addParameter(ParameterVector(SumLines.POLYGONS, "Polygons", ParameterVector.VECTOR_TYPE_POLYGON))
self.addParameter(ParameterString(SumLines.FIELD, "Output field name", "LENGTH"))
self.addOutput(OutputVector(SumLines.OUTPUT, "Result"))