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qad_label.py
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qad_label.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
QAD Quantum Aided Design plugin
funzioni per le etichette
-------------------
begin : 2014-04-24
copyright : iiiii
email : hhhhh
developers : bbbbb aaaaa ggggg
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
# Import the PyQt and QGIS libraries
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from qgis.gui import *
#===============================================================================
# get_tokenListFromLblFieldName ausilio di getTokenListFromLblFieldName
#===============================================================================
def getToken(expr, start, endChar = None):
"""
ritorna una parola dentro la stringa expr che inizia nella posizione start e che termina con il carattere
endChar. Se endChar <> None allora due endChar consecutivi valgono uno es. 'a''a' = a'a
"""
token = ""
tot = len(expr)
i = start
if endChar is None:
separators = "()+-*/%^=><|, \"'"
while i < tot:
ch = expr[i]
if separators.find(ch) >= 0:
return token, i
token = token + ch
i = i + 1
else:
while i < tot:
ch = expr[i]
if ch != endChar:
token = token + ch
elif i + 1 < tot: # se c'é un carattere successivo
if expr[i + 1] == endChar: # se il carattere successivo = endChar
token = token + ch
i = i + 1
else:
return token, i
i = i + 1
return token, i
#===============================================================================
# getTokenListFromLblFieldName ausilio di get_labelFieldNames
#===============================================================================
def getTokenListFromLblFieldName(expr):
"""
ritorna una lista di token escluse le stringhe, dall'espressione passata come parametro
"""
result = []
i = 0
tot = len(expr)
while i < tot:
ch = expr[i]
if ch == "\"": # se inizia un nome di campo
token, i = getToken(expr, i + 1, "\"")
if len(token) > 0:
result.append(token)
elif ch == "'": # se inizia una stringa
token, i = getToken(expr, i + 1, "'")
else:
token, i = getToken(expr, i)
if len(token) > 0:
result.append(token)
i = i + 1
return result
#===============================================================================
# get_activeDataDefinedPropertyFieldNames
#===============================================================================
def get_activeDataDefinedPropertyFieldNames(layer, dataDefinedProperty):
"""
ritorna la lista dei nomi dei campi che determinano il valore della proprietà attiva
"""
result = []
if (dataDefinedProperty is not None) and dataDefinedProperty.isActive():
if dataDefinedProperty.useExpression():
# estraggo i token
tokenList = getTokenListFromLblFieldName(dataDefinedProperty.expressionString())
fields = layer.label().fields()
for field in fields:
if field.name() in tokenList:
if field.name() not in result: # evito duplicati
result.append(field.name())
else:
result.append(dataDefinedProperty.field())
return result
#===============================================================================
# get_scaleFieldName
#===============================================================================
def get_labelFieldNames(layer):
"""
ritorna la lista dei campi che concorrono a formare il testo dell'etichetta
"""
result = []
if layer.type() == QgsMapLayer.VectorLayer:
palyr = QgsPalLayerSettings()
palyr.readFromLayer(layer)
if palyr.enabled:
lblFieldName = palyr.fieldName
if palyr.isExpression: # Is this label made from a expression string eg FieldName || 'mm'.
# estraggo i token
tokenList = getTokenListFromLblFieldName(lblFieldName)
fields = layer.label().fields()
for field in fields:
if field.name() in tokenList:
if field.name() not in result: # evito duplicati
result.append(field.name())
else:
result.append(lblFieldName)
return result
#===============================================================================
# get_labelRotationFieldNames
#===============================================================================
def get_labelRotationFieldNames(layer):
"""
ritorna la lista dei campi che concorrono a formare la rotazione dell'etichetta
"""
if layer.type() == QgsMapLayer.VectorLayer:
palyr = QgsPalLayerSettings()
palyr.readFromLayer(layer)
dataDefined = palyr.dataDefinedProperty(QgsPalLayerSettings.Rotation)
return get_activeDataDefinedPropertyFieldNames(layer, dataDefined)
return []
#===============================================================================
# get_labelSizeFieldNames
#===============================================================================
def get_labelSizeFieldNames(layer):
"""
ritorna la lista dei campi che concorrono a formare la dimensione del testo dell'etichetta
"""
if layer.type() == QgsMapLayer.VectorLayer:
palyr = QgsPalLayerSettings()
palyr.readFromLayer(layer)
dataDefined = palyr.dataDefinedProperty(QgsPalLayerSettings.Size)
return get_activeDataDefinedPropertyFieldNames(layer, dataDefined)
return []
#===============================================================================
# get_labelFontFamilyFieldNames
#===============================================================================
def get_labelFontFamilyFieldNames(layer):
"""
ritorna la lista dei campi che concorrono a formare il nome del font dell'etichetta
"""
if layer.type() == QgsMapLayer.VectorLayer:
palyr = QgsPalLayerSettings()
palyr.readFromLayer(layer)
dataDefined = palyr.dataDefinedProperty(QgsPalLayerSettings.Family)
return get_activeDataDefinedPropertyFieldNames(layer, dataDefined)
return []
#===============================================================================
# get_labelText
#===============================================================================
def get_labelText(palLayerSettings, feature):
"""
restituisce il testo dell'etichetta
"""
lblFieldName = palLayerSettings.fieldName
if lblFieldName == "":
return ""
if palLayerSettings.isExpression: # Is this label made from a expression string eg FieldName || 'mm'.
expr = QgsExpression(lblFieldName)
val = expr.evaluate(feature)
else:
val = feature.attribute(lblFieldName)
return val
#===============================================================================
# get_labelFontSize
#===============================================================================
def get_labelFontSize(palLayerSettings, feature):
"""
restituisce la dimensione del font dell'etichetta
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Size)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.pointSize() # Returns the point size of the font
return val
#===============================================================================
# get_labelFontFamily
#===============================================================================
def get_labelFontFamily(palLayerSettings, feature):
"""
restituisce il nome del font dell'etichetta
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Family)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.family()
return val
#===============================================================================
# get_labelFontTextNamedStyle
#===============================================================================
def get_labelFontTextNamedStyle(palLayerSettings, feature):
"""
restituisce il nome dello stile del font dell'etichetta
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.FontStyle)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textNamedStyle
return val
#===============================================================================
# get_labelIsBold
#===============================================================================
def get_labelIsBold(palLayerSettings, feature):
"""
restituisce se il font dell'etichetta é grassetto
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Bold)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.bold()
return val
#===============================================================================
# get_labelIsItalic
#===============================================================================
def get_labelIsItalic(palLayerSettings, feature):
"""
restituisce se il font dell'etichetta é italico
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Italic)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.italic()
return val
#===============================================================================
# get_labelIsUnderline
#===============================================================================
def get_labelIsUnderline(palLayerSettings, feature):
"""
restituisce se il font dell'etichetta é sottolineato
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Underline)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.underline()
return val
#===============================================================================
# get_labelIsStrikeOut
#===============================================================================
def get_labelIsStrikeOut(palLayerSettings, feature):
"""
restituisce se il font dell'etichetta é barrato
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Strikeout)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.strikeOut()
return val
#===============================================================================
# get_labelFontCase
#===============================================================================
def get_labelFontCase(palLayerSettings, feature):
"""
restituisce se il font dell'etichetta é maiuscolo/minuscolo e varie opzioni:
QFont::MixedCase 0 This is the normal text rendering option where no capitalization change is applied.
QFont::AllUppercase 1 This alters the text to be rendered in all uppercase type.
QFont::AllLowercase 2 This alters the text to be rendered in all lowercase type.
QFont::SmallCaps 3 This alters the text to be rendered in small-caps type.
QFont::Capitalize 4 This alters the text to be rendered with the first character of each word as an uppercase character.
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.FontCase)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
else:
val = palLayerSettings.textFont.capitalization()
return val
#===============================================================================
# get_labelFontSizeInMapUnits
#===============================================================================
def get_labelFontSizeInMapUnits(palLayerSettings, feature):
"""
restituisce se l'unità del font dell'etichetta é in unità mappa
"""
val = None
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.FontSizeUnit)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = True if expr.evaluate(feature) == QgsPalLayerSettings.MapUnits else False
else:
val = True if feature.attribute(dataDefined.field()) == QgsPalLayerSettings.MapUnits else False
else:
val = palLayerSettings.fontSizeInMapUnits
return val
#===============================================================================
# get_labelRot
#===============================================================================
def get_labelRot(palLayerSettings, feature):
"""
restituisce la rotazione dell'etichetta
"""
val = 0
dataDefined = palLayerSettings.dataDefinedProperty(QgsPalLayerSettings.Rotation)
if (dataDefined is not None) and dataDefined.isActive():
if dataDefined.useExpression():
expr = QgsExpression(dataDefined.expressionString())
val = expr.evaluate(feature)
else:
val = feature.attribute(dataDefined.field())
return val
#===============================================================================
# calculateLabelSize
#===============================================================================
def calculateLabelSize(layer, feature, canvas):
"""
return size for label in map units
"""
if layer.type() != QgsMapLayer.VectorLayer:
return None, None
palyr = QgsPalLayerSettings()
palyr.readFromLayer(layer)
text = get_labelText(palyr, feature)
font = QFont(palyr.textFont)
fontName = get_labelFontFamily(palyr, feature)
if fontName is not None:
font.setFamily(fontName)
fontBold = get_labelIsBold(palyr, feature)
if fontBold is not None:
font.setBold(fontBold)
fontItalic = get_labelIsItalic(palyr, feature)
if fontItalic is not None:
font.setItalic(fontItalic)
fontUnderline = get_labelIsUnderline(palyr, feature)
if fontUnderline is not None:
font.setUnderline(fontUnderline)
fontStrikeOut = get_labelIsStrikeOut(palyr, feature)
if fontStrikeOut is not None:
font.setStrikeOut(fontStrikeOut)
fontCase = get_labelFontCase(palyr, feature)
if fontCase is not None:
font.setCapitalization(fontCase)
fontSize = get_labelFontSize(palyr, feature)
if fontSize is not None:
isFontSizeInMapUnits = get_labelFontSizeInMapUnits(palyr, feature)
if isFontSizeInMapUnits:
if fontSize < 100:
font.setPixelSize(fontSize * 100)
else:
font.setPixelSize(fontSize)
fontMetricsF = QFontMetricsF(font)
rect = fontMetricsF.boundingRect(text)
dimX = rect.width()
dimY = rect.height()
if isFontSizeInMapUnits:
if fontSize < 100: # se dimX e dimY sono già in map units * 10
return dimX / 100, dimY / 100
else:
return dimX, dimY
else:
mapToPixel = canvas.getCoordinateTransform() # trasformo pixel in map units
dimX = dimX * mapToPixel.mapUnitsPerPixel()
dimY = dimY * mapToPixel.mapUnitsPerPixel()
return dimX, dimY
return None, None