/*!
Minimum size hint needed to display an entry
\param data Attributes of the legend entry
\return Minimum size
*/
QSize QwtPlotLegendItem::minimumSize( const QwtLegendData &data ) const
{
QSize size( 2 * d_data->itemMargin, 2 * d_data->itemMargin );
if ( !data.isValid() )
return size;
const QwtGraphic graphic = data.icon();
const QwtText text = data.title();
int w = 0;
int h = 0;
if ( !graphic.isNull() )
{
w = graphic.width();
h = graphic.height();
}
if ( !text.isEmpty() )
{
const QSizeF sz = text.textSize( font() );
w += qCeil( sz.width() );
h = qMax( h, qCeil( sz.height() ) );
}
if ( graphic.width() > 0 && !text.isEmpty() )
w += d_data->itemSpacing;
size += QSize( w, h );
return size;
}
/*!
\return The preferred height, for a width.
\param data Attributes of the legend entry
\param width Width
*/
int QwtPlotLegendItem::heightForWidth(
const QwtLegendData &data, int width ) const
{
width -= 2 * d_data->itemMargin;
const QwtGraphic graphic = data.icon();
const QwtText text = data.title();
if ( text.isEmpty() )
return graphic.height();
if ( graphic.width() > 0 )
width -= graphic.width() + d_data->itemSpacing;
int h = text.heightForWidth( width, font() );
h += 2 * d_data->itemMargin;
return qMax( graphic.height(), h );
}
/*!
Set the attributes of the legend label
\param legendData Attributes of the label
\sa data()
*/
void QwtLegendLabel::setData( const QwtLegendData &legendData )
{
d_data->legendData = legendData;
const bool doUpdate = updatesEnabled();
setUpdatesEnabled( false );
setText( legendData.title() );
setIcon( legendData.icon().toPixmap() );
if ( legendData.hasRole( QwtLegendData::ModeRole ) )
setItemMode( legendData.mode() );
if ( doUpdate )
{
setUpdatesEnabled( true );
update();
}
}
/*!
Draw an entry on the legend
\param painter Qt Painter
\param plotItem Plot item, represented by the entry
\param data Attributes of the legend entry
\param rect Bounding rectangle for the entry
*/
void QwtPlotLegendItem::drawLegendData( QPainter *painter,
const QwtPlotItem *plotItem, const QwtLegendData &data,
const QRectF &rect ) const
{
Q_UNUSED( plotItem );
const int m = d_data->itemMargin;
const QRectF r = rect.toRect().adjusted( m, m, -m, -m );
painter->setClipRect( r, Qt::IntersectClip );
int titleOff = 0;
const QwtGraphic graphic = data.icon();
if ( !graphic.isEmpty() )
{
QRectF iconRect( r.topLeft(), graphic.defaultSize() );
iconRect.moveCenter(
QPoint( iconRect.center().x(), rect.center().y() ) );
graphic.render( painter, iconRect, Qt::KeepAspectRatio );
titleOff += iconRect.width() + d_data->itemSpacing;
}
const QwtText text = data.title();
if ( !text.isEmpty() )
{
painter->setPen( textPen() );
painter->setFont( font() );
const QRectF textRect = r.adjusted( titleOff, 0, 0, 0 );
text.draw( painter, textRect );
}
}