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148 lines
4.8 KiB
Python
148 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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FToolsUtils.py
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---------------------
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Date : September 2012
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Copyright : (C) 2012 by Carson Farmer, Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Carson, Farmer, Victor Olaya'
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__date__ = 'September 2012'
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__copyright__ = '(C) 2012, Carson Farmer, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from PyQt4.QtCore import *
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from sextante.core.QGisLayers import QGisLayers
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from qgis.core import *
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def createSpatialIndex(layer):
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idx = QgsSpatialIndex()
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features = QGisLayers.features(layer)
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for ft in features:
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idx.insertFeature(ft)
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return idx
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def createUniqueFieldName(fieldName, fieldList):
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shortName = fieldName[:10]
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if len(fieldList) == 0:
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return shortName
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if shortName not in fieldList:
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return shortName
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shortName = fieldName[:8] + "_1"
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changed = True
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while changed:
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changed = False
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for n in fieldList:
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if n == shortName:
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# create unique field name
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num = int(shortName[-1:])
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if num < 9:
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shortName = shortName[:8] + "_" + str(num + 1)
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else:
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shortName = shortName[:7] + "_" + str(num + 1)
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changed = True
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return shortName
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def findOrCreateField(layer, fieldList, fieldName, fieldLen=24, fieldPrec=15):
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idx = layer.fieldNameIndex(fieldName)
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if idx == -1:
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fn = createUniqueFieldName(fieldName, fieldList)
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field = QgsField(fn, QVariant.Double, "", fieldLen, fieldPrec)
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idx = len(fieldList)
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fieldList.append(field)
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return idx, fieldList
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def extractPoints( geom ):
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points = []
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if geom.type() == QGis.Point:
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if geom.isMultipart():
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points = geom.asMultiPoint()
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else:
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points.append(geom.asPoint())
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elif geom.type() == QGis.Line:
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if geom.isMultipart():
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lines = geom.asMultiPolyline()
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for line in lines:
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points.extend(line)
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else:
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points = geom.asPolyline()
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elif geom.type() == QGis.Polygon:
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if geom.isMultipart():
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polygons = geom.asMultiPolygon()
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for poly in polygons:
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for line in poly:
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points.extend(line)
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else:
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polygon = geom.asPolygon()
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for line in polygon:
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points.extend(line)
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return points
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def getUniqueValues(layer, fieldIndex):
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values = []
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layer.select([fieldIndex], QgsRectangle(), False)
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features = QGisLayers.features(layer)
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for feat in features:
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if feat.attributes()[fieldIndex] not in values:
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values.append(feat.attributes()[fieldIndex])
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return values
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def getUniqueValuesCount(layer, fieldIndex):
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return len(getUniqueValues(layer, fieldIndex))
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# From two input field maps, create single field map
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def combineVectorFields( layerA, layerB ):
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fieldsA = layerA.fields()
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fieldsB = layerB.fields()
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fieldsB = testForUniqueness( fieldsA, fieldsB )
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fieldsA.extend( fieldsB )
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return fieldsA
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# Check if two input field maps are unique, and resolve name issues if they aren't
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def testForUniqueness( fieldList1, fieldList2 ):
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changed = True
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while changed:
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changed = False
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for i in fieldList1:
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for j in fieldList2:
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if j.name() == i.name():
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j = createUniqueFieldNameFromName( j )
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changed = True
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return fieldList2
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# Create a unique field name based on input field name
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def createUniqueFieldNameFromName( field ):
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check = field.name().right( 2 )
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shortName = field.name().left( 8 )
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if check.startsWith("_"):
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( val, test ) = check.right( 1 ).toInt()
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if test:
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if val < 2:
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val = 2
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else:
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val = val + 1
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field.setName( shortName.left( len( shortName )-1 ) + unicode( val ) )
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else:
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field.setName( shortName + "_2" )
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else:
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field.setName( shortName + "_2" )
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return field
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