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review Export geometry info tool, sync with master
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
import os.path | ||
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from PyQt4 import QtGui | ||
from PyQt4.QtCore import * | ||
from PyQt4.QtGui import * | ||
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from qgis.core import * | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
from sextante.core.QGisLayers import QGisLayers | ||
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from sextante.parameters.ParameterVector import ParameterVector | ||
from sextante.parameters.ParameterSelection import ParameterSelection | ||
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from sextante.outputs.OutputVector import OutputVector | ||
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from sextante.ftools import FToolsUtils as utils | ||
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class ExportGeometryInfo(GeoAlgorithm): | ||
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INPUT = "INPUT" | ||
METHOD = "CALC_METHOD" | ||
OUTPUT = "OUTPUT" | ||
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CALC_METHODS = ["Layer CRS", | ||
"Project CRS", | ||
"Ellipsoidal" | ||
] | ||
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def getIcon(self): | ||
return QtGui.QIcon(os.path.dirname(__file__) + "/icons/export_geometry.png") | ||
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def defineCharacteristics(self): | ||
self.name = "Export/Add geometry columns" | ||
self.group = "Geometry tools" | ||
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self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterSelection(self.METHOD, "Calculate using", self.CALC_METHODS, 0)) | ||
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self.addOutput(OutputVector(self.OUTPUT, "Output layer")) | ||
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def processAlgorithm(self, progress): | ||
vlayer = QGisLayers.getObjectFromUri(self.getParameterValue(ExportGeometryInfo.INPUT)) | ||
vprovider = vlayer.dataProvider() | ||
allAttrs = vprovider.attributeIndexes() | ||
vprovider.select( allAttrs ) | ||
( fields, index1, index2 ) = self.checkGeometryFields(vlayer) | ||
writer = self.getOutputFromName(ExportGeometryInfo.OUTPUT).getVectorWriter(fields, vprovider.geometryType(), vprovider.crs() ) | ||
layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT)) | ||
method = self.getParameterValue(self.METHOD) | ||
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output = self.getOutputValue(self.OUTPUT) | ||
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provider = layer.dataProvider() | ||
geometryType = layer.geometryType() | ||
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layer.select(layer.pendingAllAttributesList()) | ||
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idx1 = -1 | ||
idx2 = -1 | ||
fields = layer.pendingFields() | ||
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if geometryType == QGis.Polygon: | ||
idx1, fields = utils.findOrCreateField(layer, fields, "area", 21, 6) | ||
idx2, fields = utils.findOrCreateField(layer, fields, "perimeter", 21, 6) | ||
elif geometryType == QGis.Line: | ||
idx1, fields = utils.findOrCreateField(layer, fields, "length", 21, 6) | ||
idx2 = idx1 | ||
else: | ||
idx1, fields = utils.findOrCreateField(layer, fields, "xcoord", 21, 6) | ||
idx2, fields = utils.findOrCreateField(layer, fields, "ycoord", 21, 6) | ||
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, | ||
provider.geometryType(), provider.crs()) | ||
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ellips = None | ||
crs = None | ||
coordTransform = None | ||
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# calculate with: | ||
# 0 - layer CRS | ||
# 1 - project CRS | ||
# 2 - ellipsoidal | ||
if method == 2: | ||
settings = QSettings() | ||
ellips = settings.value("/qgis/measure/ellipsoid", "WGS84").toString() | ||
crs = layer.crs().srsid() | ||
elif method == 1: | ||
mapCRS = QGisLayers.iface.mapCanvas().mapRenderer().destinationCrs() | ||
layCRS = layer.crs() | ||
coordTransform = QgsCoordinateTransform(layCRS, mapCRS) | ||
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inFeat = QgsFeature() | ||
outFeat = QgsFeature() | ||
inGeom = QgsGeometry() | ||
nFeat = vprovider.featureCount() | ||
nElement = 0 | ||
while vprovider.nextFeature(inFeat): | ||
progress.setPercentage(int(nElement/nFeat * 100)) | ||
nElement += 1 | ||
inGeom = inFeat.geometry() | ||
( attr1, attr2 ) = self.simpleMeasure( inGeom ) | ||
outFeat.setGeometry( inGeom ) | ||
atMap = inFeat.attributeMap() | ||
outFeat.setAttributeMap( atMap ) | ||
outFeat.addAttribute( index1, QVariant( attr1 ) ) | ||
outFeat.addAttribute( index2, QVariant( attr2 ) ) | ||
writer.addFeature( outFeat ) | ||
del writer | ||
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current = 0 | ||
total = 100.0 / float(provider.featureCount()) | ||
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def simpleMeasure( self, inGeom ): | ||
if inGeom.wkbType() in (QGis.WKBPoint, QGis.WKBPoint25D): | ||
pt = QgsPoint() | ||
pt = inGeom.asPoint() | ||
attr1 = pt.x() | ||
attr2 = pt.y() | ||
elif inGeom.wkbType() in (QGis.WKBMultiPoint, QGis.WKBMultiPoint25D): | ||
pt = inGeom.asMultiPoint() | ||
attr1 = pt[ 0 ].x() | ||
attr2 = pt[ 0 ].y() | ||
else: | ||
measure = QgsDistanceArea() | ||
attr1 = measure.measure(inGeom) | ||
if inGeom.type() == QGis.Polygon: | ||
attr2 = self.perimMeasure( inGeom, measure ) | ||
else: | ||
attr2 = attr1 | ||
return ( attr1, attr2 ) | ||
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def perimMeasure( self, inGeom, measure ): | ||
value = 0.00 | ||
if inGeom.isMultipart(): | ||
poly = inGeom.asMultiPolygon() | ||
for k in poly: | ||
for j in k: | ||
value = value + measure.measureLine( j ) | ||
else: | ||
poly = inGeom.asPolygon() | ||
for k in poly: | ||
value = value + measure.measureLine( k ) | ||
return value | ||
while layer.nextFeature(inFeat): | ||
inGeom = inFeat.geometry() | ||
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if method == 1: | ||
inGeom.transform(coordTransform) | ||
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(attr1, attr2) = self.simpleMeasure(inGeom, method, ellips, crs) | ||
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outFeat.setGeometry(inGeom) | ||
atMap = inFeat.attributeMap() | ||
outFeat.setAttributeMap(atMap) | ||
outFeat.addAttribute(idx1, QVariant(attr1)) | ||
outFeat.addAttribute(idx2, QVariant(attr2)) | ||
writer.addFeature( outFeat ) | ||
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def checkForField( self, L, e ): | ||
e = QString( e ).toLower() | ||
fieldRange = range( 0,len( L ) ) | ||
for item in fieldRange: | ||
if L[ item ].toLower() == e: | ||
return True, item | ||
return False, len( L ) | ||
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def checkGeometryFields( self, vlayer ): | ||
vprovider = vlayer.dataProvider() | ||
nameList = [] | ||
fieldList = vprovider.fields() | ||
geomType = vlayer.geometryType() | ||
for i in fieldList.keys(): | ||
nameList.append( fieldList[ i ].name().toLower() ) | ||
if geomType == QGis.Polygon: | ||
plp = "Poly" | ||
( found, index1 ) = self.checkForField( nameList, "AREA" ) | ||
if not found: | ||
field = QgsField( "AREA", QVariant.Double, "double", 21, 6, "Polygon area" ) | ||
index1 = len( fieldList.keys() ) | ||
fieldList[ index1 ] = field | ||
( found, index2 ) = self.checkForField( nameList, "PERIMETER" ) | ||
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if not found: | ||
field = QgsField( "PERIMETER", QVariant.Double, "double", 21, 6, "Polygon perimeter" ) | ||
index2 = len( fieldList.keys() ) | ||
fieldList[ index2 ] = field | ||
elif geomType == QGis.Line: | ||
plp = "Line" | ||
(found, index1) = self.checkForField(nameList, "LENGTH") | ||
if not found: | ||
field = QgsField("LENGTH", QVariant.Double, "double", 21, 6, "Line length" ) | ||
index1 = len(fieldList.keys()) | ||
fieldList[index1] = field | ||
index2 = index1 | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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del writer | ||
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def simpleMeasure(self, geom, method, ellips, crs): | ||
if geom.wkbType() in [QGis.WKBPoint, QGis.WKBPoint25D]: | ||
pt = geom.asPoint() | ||
attr1 = pt.x() | ||
attr2 = pt.y() | ||
elif geom.wkbType() in [QGis.WKBMultiPoint, QGis.WKBMultiPoint25D]: | ||
pt = inGeom.asMultiPoint() | ||
attr1 = pt[0].x() | ||
attr2 = pt[0].y() | ||
else: | ||
plp = "Point" | ||
(found, index1) = self.checkForField(nameList, "XCOORD") | ||
if not found: | ||
field = QgsField("XCOORD", QVariant.Double, "double", 21, 6, "Point x coordinate" ) | ||
index1 = len(fieldList.keys()) | ||
fieldList[index1] = field | ||
(found, index2) = self.checkForField(nameList, "YCOORD") | ||
if not found: | ||
field = QgsField("YCOORD", QVariant.Double, "double", 21, 6, "Point y coordinate" ) | ||
index2 = len(fieldList.keys()) | ||
fieldList[index2] = field | ||
return (fieldList, index1, index2) | ||
measure = QgsDistanceArea() | ||
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if method == 2: | ||
measure.setSourceCrs(crs) | ||
measure.setEllipsoid(ellips) | ||
measure.setProjectionsEnabled(True) | ||
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def defineCharacteristics(self): | ||
self.name = "Export/Add geometry columns" | ||
self.group = "Geometry tools" | ||
self.addParameter(ParameterVector(ExportGeometryInfo.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addOutput(OutputVector(ExportGeometryInfo.OUTPUT, "Output layer")) | ||
#========================================================= | ||
attr1 = measure.measure(geom) | ||
if geom.type() == QGis.Polygon: | ||
attr2 = self.perimMeasure(geom, measure) | ||
else: | ||
attr2 = attr1 | ||
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return (attr1, attr2) | ||
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def perimMeasure(self, geom, measure): | ||
value = 0.0 | ||
if geom.isMultipart(): | ||
polygons = geom.asMultiPolygon() | ||
for p in polygons: | ||
for line in p: | ||
value += measure.measureLine(line) | ||
else: | ||
poly = geom.asPolygon() | ||
for r in poly: | ||
value += measure.measureLine(r) | ||
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return value |
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