virtual QwtText label(double value) const
{
QwtText lbl;
const int index = qRound(value);
if ((value == (double)index) && index >= 0 && index < m_labels.size())
{
lbl = QwtText(m_labels[index], QwtText::TeXText);
lbl.setLayoutAttribute(QwtText::MinimumLayout);
}
return lbl;
}
/*!
\brief Convert a value into its representing label and cache it.
The conversion between value and label is called very often
in the layout and painting code. Unfortunately the
calculation of the label sizes might be slow (really slow
for rich text in Qt4), so it's necessary to cache the labels.
\param font Font
\param value Value
\return Tick label
*/
const QwtText &QwtAbstractScaleDraw::tickLabel(
const QFont &font, double value ) const
{
QMap<double, QwtText>::const_iterator it1 = d_data->labelCache.constFind( value );
if ( it1 != d_data->labelCache.constEnd() )
return *it1;
QwtText lbl = label( value );
lbl.setRenderFlags( 0 );
lbl.setLayoutAttribute( QwtText::MinimumLayout );
( void )lbl.textSize( font ); // initialize the internal cache
QMap<double, QwtText>::iterator it2 = d_data->labelCache.insert( value, lbl );
return *it2;
}
