C++ QwtGraphic::setDefaultSize方法代码示例

/*!
  \return Icon for the legend

  In case of Tube style() the icon is a plain rectangle filled with the brush().
  If a symbol is assigned it is scaled to size.

  \param index Index of the legend entry 
               ( ignored as there is only one )
  \param size Icon size
    
  \sa QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
*/
QwtGraphic QwtPlotIntervalCurve::legendIcon( 
    int index, const QSizeF &size ) const
{
    Q_UNUSED( index );

    if ( size.isEmpty() )
        return QwtGraphic();

    QwtGraphic icon;
    icon.setDefaultSize( size );
    icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &icon );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    if ( d_data->style == Tube )
    {
        QRectF r( 0, 0, size.width(), size.height() );
        painter.fillRect( r, d_data->brush );
    }

    if ( d_data->symbol &&
        ( d_data->symbol->style() != QwtIntervalSymbol::NoSymbol ) )
    {
        QPen pen = d_data->symbol->pen();
        pen.setWidthF( pen.widthF() );
        pen.setCapStyle( Qt::FlatCap );

        painter.setPen( pen );
        painter.setBrush( d_data->symbol->brush() );

        if ( orientation() == Qt::Vertical )
        {
            const double x = 0.5 * size.width();

            d_data->symbol->draw( &painter, orientation(),
                QPointF( x, 0 ), QPointF( x, size.height() - 1.0 ) );
        }
        else
        {
            const double y = 0.5 * size.height();

            d_data->symbol->draw( &painter, orientation(),
                QPointF( 0.0, y ), QPointF( size.width() - 1.0, y ) );
        }
    }

    return icon;
}

/*!
   \return Icon representing the marker on the legend

   \param index Index of the legend entry 
                ( usually there is only one )
   \param size Icon size

   \sa setLegendIconSize(), legendData()
*/
QwtGraphic QwtPlotMarker::legendIcon( int index,
    const QSizeF &size ) const
{
    Q_UNUSED( index );

    if ( size.isEmpty() )
        return QwtGraphic();

    QwtGraphic icon;
    icon.setDefaultSize( size );
    icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &icon );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    if ( d_data->style != QwtPlotMarker::NoLine )
    {
        painter.setPen( d_data->pen );

        if ( d_data->style == QwtPlotMarker::HLine ||
            d_data->style == QwtPlotMarker::Cross )
        {
            const double y = 0.5 * size.height();

            QwtPainter::drawLine( &painter, 
                0.0, y, size.width(), y );
        }

        if ( d_data->style == QwtPlotMarker::VLine ||
            d_data->style == QwtPlotMarker::Cross )
        {
            const double x = 0.5 * size.width();

            QwtPainter::drawLine( &painter, 
                x, 0.0, x, size.height() );
        }
    }

    if ( d_data->symbol )
    {
        const QRect r( 0.0, 0.0, size.width(), size.height() );
        d_data->symbol->drawSymbol( &painter, r );
    }

    return icon;
}

/*!
  \return Icon for representing a bar on the legend

  \param index Index of the bar
  \param size Icon size
  
  \return An icon showing a bar
  \sa drawBar(), legendData()
 */
QwtGraphic QwtPlotMultiBarChart::legendIcon( int index,
    const QSizeF &size ) const
{
    QwtColumnRect column;
    column.hInterval = QwtInterval( 0.0, size.width() - 1.0 );
    column.vInterval = QwtInterval( 0.0, size.height() - 1.0 );

    QwtGraphic icon;
    icon.setDefaultSize( size );
    icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &icon );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    drawBar( &painter, -1, index, column );

    return icon;
}

QwtGraphic Plot2DProfile::legendIcon( int /*index*/, const QSizeF& iconSize ) const {
    if ( iconSize.isEmpty() ){
        return QwtGraphic();
    }
    QwtGraphic icon;
    icon.setDefaultSize( iconSize );
    icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &icon );
    QPen pen( m_defaultColor );
    pen.setStyle( m_penStyle );
    pen.setWidth( 3 );
    const double y = 0.5 * iconSize.height();
    QPainterPath path;
    path.moveTo( 0.0, y );
    path.lineTo( iconSize.width(), y );
    painter.strokePath( path, pen );
    return icon;
}

/*!
  \return A rectangle filled with the color of the brush ( or the pen )

  \param index Index of the legend entry 
                ( usually there is only one )
  \param size Icon size

  \sa setLegendIconSize(), legendData()
*/
QwtGraphic QwtPlotShapeItem::legendIcon( int index,
    const QSizeF &size ) const
{
    Q_UNUSED( index );

    QwtGraphic icon;
    icon.setDefaultSize( size );

    if ( size.isEmpty() )
        return icon;

    if ( d_data->legendMode == QwtPlotShapeItem::LegendShape )
    {
        const QRectF &br = d_data->boundingRect;

        QPainter painter( &icon );
        painter.setRenderHint( QPainter::Antialiasing,
            testRenderHint( QwtPlotItem::RenderAntialiased ) );

        painter.translate( -br.topLeft() );

        painter.setPen( d_data->pen );
        painter.setBrush( d_data->brush );
        painter.drawPath( d_data->shape );
    }
    else
    {
        QColor iconColor;
        if ( d_data->brush.style() != Qt::NoBrush )
            iconColor = d_data->brush.color();
        else
            iconColor = d_data->pen.color();

        icon = defaultIcon( iconColor, size );
    }

    return icon;
}

/*!
   \return Icon representing a bar or the chart on the legend

   When the legendMode() is LegendBarTitles the icon shows
   the bar corresponding to index - otherwise the bar
   displays the default symbol.

   \param index Index of the legend entry 
   \param size Icon size

   \sa setLegendMode(), drawBar(), 
       QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
 */
QwtGraphic QwtPlotBarChart::legendIcon( 
    int index, const QSizeF &size ) const
{
    QwtColumnRect column;
    column.hInterval = QwtInterval( 0.0, size.width() - 1.0 );
    column.vInterval = QwtInterval( 0.0, size.height() - 1.0 );

    QwtGraphic icon;
    icon.setDefaultSize( size );
    icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &icon );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    int barIndex = -1;
    if ( d_data->legendMode == QwtPlotBarChart::LegendBarTitles )
        barIndex = index;
        
    drawBar( &painter, barIndex, QPointF(), column );

    return icon;
}

/*!
   \return Icon representing the curve on the legend

   \param index Index of the legend entry 
                ( ignored as there is only one )
   \param size Icon size

   \sa QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
 */
QwtGraphic QwtPlotCurve::legendIcon( int index, 
    const QSizeF &size ) const
{
    Q_UNUSED( index );

    if ( size.isEmpty() )
        return QwtGraphic();

    QwtGraphic graphic;
    graphic.setDefaultSize( size );
    graphic.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &graphic );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    if ( d_data->legendAttributes == 0 ||
        d_data->legendAttributes & QwtPlotCurve::LegendShowBrush )
    {
        QBrush brush = d_data->brush;

        if ( brush.style() == Qt::NoBrush &&
            d_data->legendAttributes == 0 )
        {
            if ( style() != QwtPlotCurve::NoCurve )
            {
                brush = QBrush( pen().color() );
            }
            else if ( d_data->symbol &&
                ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
            {
                brush = QBrush( d_data->symbol->pen().color() );
            }
        }

        if ( brush.style() != Qt::NoBrush )
        {
            QRectF r( 0, 0, size.width(), size.height() );
            painter.fillRect( r, brush );
        }
    }

    if ( d_data->legendAttributes & QwtPlotCurve::LegendShowLine )
    {
        if ( pen() != Qt::NoPen )
        {
            QPen pn = pen();
            pn.setCapStyle( Qt::FlatCap );

            painter.setPen( pn );

            const double y = 0.5 * size.height();
            QwtPainter::drawLine( &painter, 0.0, y, size.width(), y );
        }
    }

    if ( d_data->legendAttributes & QwtPlotCurve::LegendShowSymbol )
    {
        if ( d_data->symbol )
        {
            QRectF r( 0, 0, size.width(), size.height() );
            d_data->symbol->drawSymbol( &painter, r );
        }
    }

    return graphic;
}