bool QgsMapToolLabel::rotationPoint( QgsPoint& pos, bool ignoreUpsideDown, bool rotatingUnpinned )
{
QVector<QgsPoint> cornerPoints = mCurrentLabelPos.cornerPoints;
if ( cornerPoints.size() < 4 )
{
return false;
}
if ( mCurrentLabelPos.upsideDown && !ignoreUpsideDown )
{
pos = cornerPoints.at( 2 );
}
else
{
pos = cornerPoints.at( 0 );
}
//alignment always center/center and rotation 0 for diagrams
if ( mCurrentLabelPos.isDiagram )
{
pos.setX( pos.x() + mCurrentLabelPos.labelRect.width() / 2.0 );
pos.setY( pos.y() + mCurrentLabelPos.labelRect.height() / 2.0 );
return true;
}
//adapt pos depending on data defined alignment
QString haliString, valiString;
currentAlignment( haliString, valiString );
// rotate unpinned labels (i.e. no hali/vali settings) as if hali/vali was Center/Half
if ( rotatingUnpinned )
{
haliString = "Center";
valiString = "Half";
}
// QFont labelFont = labelFontCurrentFeature();
QFontMetricsF labelFontMetrics( mCurrentLabelPos.labelFont );
// NOTE: this assumes the label corner points comprise a rectangle and that the
// CRS supports equidistant measurements to accurately determine hypotenuse
QgsPoint cp_0 = cornerPoints.at( 0 );
QgsPoint cp_1 = cornerPoints.at( 1 );
QgsPoint cp_3 = cornerPoints.at( 3 );
// QgsDebugMsg( QString( "cp_0: x=%1, y=%2" ).arg( cp_0.x() ).arg( cp_0.y() ) );
// QgsDebugMsg( QString( "cp_1: x=%1, y=%2" ).arg( cp_1.x() ).arg( cp_1.y() ) );
// QgsDebugMsg( QString( "cp_3: x=%1, y=%2" ).arg( cp_3.x() ).arg( cp_3.y() ) );
double labelSizeX = qSqrt( cp_0.sqrDist( cp_1 ) );
double labelSizeY = qSqrt( cp_0.sqrDist( cp_3 ) );
double xdiff = 0;
double ydiff = 0;
if ( haliString.compare( "Center", Qt::CaseInsensitive ) == 0 )
{
xdiff = labelSizeX / 2.0;
}
else if ( haliString.compare( "Right", Qt::CaseInsensitive ) == 0 )
{
xdiff = labelSizeX;
}
if ( valiString.compare( "Top", Qt::CaseInsensitive ) == 0 || valiString.compare( "Cap", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY;
}
else
{
double descentRatio = 1 / labelFontMetrics.ascent() / labelFontMetrics.height();
if ( valiString.compare( "Base", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY * descentRatio;
}
else if ( valiString.compare( "Half", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY * 0.5 * ( 1 - descentRatio );
}
}
double angle = mCurrentLabelPos.rotation;
double xd = xdiff * cos( angle ) - ydiff * sin( angle );
double yd = xdiff * sin( angle ) + ydiff * cos( angle );
if ( mCurrentLabelPos.upsideDown && !ignoreUpsideDown )
{
pos.setX( pos.x() - xd );
pos.setY( pos.y() - yd );
}
else
{
pos.setX( pos.x() + xd );
pos.setY( pos.y() + yd );
}
return true;
}
bool QgsMapToolLabel::rotationPoint( QgsPoint& pos, bool ignoreUpsideDown )
{
QVector<QgsPoint> cornerPoints = mCurrentLabelPos.cornerPoints;
if ( cornerPoints.size() < 4 )
{
return false;
}
if ( mCurrentLabelPos.upsideDown && !ignoreUpsideDown )
{
pos = mCurrentLabelPos.cornerPoints.at( 2 );
}
else
{
pos = mCurrentLabelPos.cornerPoints.at( 0 );
}
//alignment always center/center and rotation 0 for diagrams
if ( mCurrentLabelPos.isDiagram )
{
pos.setX( pos.x() + mCurrentLabelPos.labelRect.width() / 2.0 );
pos.setY( pos.y() + mCurrentLabelPos.labelRect.height() / 2.0 );
return true;
}
//adapt pos depending on data defined alignment
QString haliString, valiString;
currentAlignment( haliString, valiString );
if ( !mCurrentLabelPos.isPinned )
{
haliString = "Center";
valiString = "Half";
}
QFont labelFont = labelFontCurrentFeature();
QFontMetricsF labelFontMetrics( labelFont );
//label text?
QString labelText = currentLabelText();
bool labelSettingsOk;
QgsPalLayerSettings& labelSettings = currentLabelSettings( &labelSettingsOk );
if ( !labelSettingsOk )
{
return false;
}
double labelSizeX, labelSizeY;
labelSettings.calculateLabelSize( &labelFontMetrics, labelText, labelSizeX, labelSizeY );
double xdiff = 0;
double ydiff = 0;
if ( haliString.compare( "Center", Qt::CaseInsensitive ) == 0 )
{
xdiff = labelSizeX / 2.0;
}
else if ( haliString.compare( "Right", Qt::CaseInsensitive ) == 0 )
{
xdiff = labelSizeX;
}
if ( valiString.compare( "Top", Qt::CaseInsensitive ) == 0 || valiString.compare( "Cap", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY;
}
else
{
double descentRatio = 1 / labelFontMetrics.ascent() / labelFontMetrics.height();
if ( valiString.compare( "Base", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY * descentRatio;
}
else if ( valiString.compare( "Half", Qt::CaseInsensitive ) == 0 )
{
ydiff = labelSizeY * descentRatio;
ydiff = labelSizeY * 0.5 * ( 1 - descentRatio );
}
}
double angle = mCurrentLabelPos.rotation;
double xd = xdiff * cos( angle ) - ydiff * sin( angle );
double yd = xdiff * sin( angle ) + ydiff * cos( angle );
if ( mCurrentLabelPos.upsideDown && !ignoreUpsideDown )
{
pos.setX( pos.x() - xd );
pos.setY( pos.y() - yd );
}
else
{
pos.setX( pos.x() + xd );
pos.setY( pos.y() + yd );
}
return true;
}
