QStandardItem* QgsLegendModel::itemFromSymbol( QgsSymbol* s, int opacity, const QString& layerID )
{
QgsComposerSymbolItem* currentSymbolItem = 0;
//label
QString itemText;
QString label;
QString lowerValue = s->lowerValue();
QString upperValue = s->upperValue();
label = s->label();
//Take the label as item text if it is there
if ( !label.isEmpty() )
{
itemText = label;
}
//take single value
else if ( lowerValue == upperValue || upperValue.isEmpty() )
{
itemText = lowerValue;
}
else //or value range
{
itemText = lowerValue + " - " + upperValue;
}
//icon item
QImage symbolImage;
switch ( s->type() )
{
case QGis::Point:
symbolImage = s->getPointSymbolAsImage();
break;
case QGis::Line:
symbolImage = s->getLineSymbolAsImage();
break;
case QGis::Polygon:
symbolImage = s->getPolygonSymbolAsImage();
break;
default:
return 0;
}
if ( opacity != 255 )
{
//todo: manipulate image pixel by pixel...
QRgb oldColor;
for ( int i = 0; i < symbolImage.height(); ++i )
{
QRgb* scanLineBuffer = ( QRgb* ) symbolImage.scanLine( i );
for ( int j = 0; j < symbolImage.width(); ++j )
{
oldColor = symbolImage.pixel( j, i );
scanLineBuffer[j] = qRgba( qRed( oldColor ), qGreen( oldColor ), qBlue( oldColor ), opacity );
}
}
}
currentSymbolItem = new QgsComposerSymbolItem( itemText );
if ( mHasTopLevelWindow )//only use QIcon / QPixmap if we have a running x-server
{
currentSymbolItem->setIcon( QIcon( QPixmap::fromImage( symbolImage ) ) );
}
if ( !currentSymbolItem )
{
return 0;
}
//Pass deep copy of QgsSymbol as user data. Cast to void* necessary such that QMetaType handles it
QgsSymbol* symbolCopy = new QgsSymbol( *s );
currentSymbolItem->setSymbol( symbolCopy );
currentSymbolItem->setFlags( Qt::ItemIsEnabled | Qt::ItemIsSelectable );
currentSymbolItem ->setLayerID( layerID );
return currentSymbolItem;
}
