C++ QwtInterval::borderFlags方法代码示例

static QRectF qwtStripRect(const QRectF &rect, const QRectF &area,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QwtInterval &xInterval, const QwtInterval &yInterval)
{
    QRectF r = rect;
    if ( xInterval.borderFlags() & QwtInterval::ExcludeMinimum )
    {
        if ( area.left() <= xInterval.minValue() )
        {
            if ( xMap.isInverting() )
                r.adjust(0, 0, -1, 0);
            else
                r.adjust(1, 0, 0, 0);
        }
    }

    if ( xInterval.borderFlags() & QwtInterval::ExcludeMaximum )
    {
        if ( area.right() >= xInterval.maxValue() )
        {
            if ( xMap.isInverting() )
                r.adjust(1, 0, 0, 0);
            else
                r.adjust(0, 0, -1, 0);
        }
    }

    if ( yInterval.borderFlags() & QwtInterval::ExcludeMinimum )
    {
        if ( area.top() <= yInterval.minValue() )
        {
            if ( yMap.isInverting() )
                r.adjust(0, 0, 0, -1);
            else
                r.adjust(0, 1, 0, 0);
        }
    }

    if ( yInterval.borderFlags() & QwtInterval::ExcludeMaximum )
    {
        if ( area.bottom() >= yInterval.maxValue() )
        {
            if ( yMap.isInverting() )
                r.adjust(0, 1, 0, 0);
            else
                r.adjust(0, 0, 0, -1);
        }
    }

    return r;
}

static inline bool isCombinable( const QwtInterval &d1,
    const QwtInterval &d2 )
{
    if ( d1.isValid() && d2.isValid() )
    {
        if ( d1.maxValue() == d2.minValue() )
        {
            if ( !( d1.borderFlags() & QwtInterval::ExcludeMaximum
                && d2.borderFlags() & QwtInterval::ExcludeMinimum ) )
            {
                return true;
            }
        }
    }

    return false;
}

//.........这里部分代码省略.........
        // pixel in target device resolution 
        const double dx = qAbs( xxMap.invTransform( 1 ) - xxMap.invTransform( 0 ) );
        const double dy = qAbs( yyMap.invTransform( 1 ) - yyMap.invTransform( 0 ) );

        if ( dx > pixelRect.width() && dy > pixelRect.height() )
        {
            /*
              When the resolution of the data pixels is higher than
              the resolution of the target device we render in
              target device resolution.
             */
            pixelRect = QRectF();
        }
    }

    if ( pixelRect.isEmpty() )
    {
        if ( QwtPainter::roundingAlignment( painter ) )
        {
            // we want to have maps, where the boundaries of
            // the aligned paint rectangle exactly match the area

            paintRect = qwtAlignRect(paintRect);
            qwtAdjustMaps(xxMap, yyMap, area, paintRect);
        }

        // When we have no information about position and size of
        // data pixels we render in resolution of the paint device.

        image = compose(xxMap, yyMap, 
            area, paintRect, paintRect.size().toSize(), doCache);
        if ( image.isNull() )
            return;

        // Remove pixels at the boundaries, when explicitly
        // excluded in the intervals

        imageRect = qwtStripRect(paintRect, area, 
            xxMap, yyMap, xInterval, yInterval);

        if ( imageRect != paintRect )
        {
            const QRect r( 
                qRound( imageRect.x() - paintRect.x()),
                qRound( imageRect.y() - paintRect.y() ),
                qRound( imageRect.width() ),
                qRound( imageRect.height() ) );
                
            image = image.copy(r);
        }   
    }
    else
    {
        if ( QwtPainter::roundingAlignment( painter ) )
            paintRect = qwtAlignRect(paintRect);

        // align the area to the data pixels
        QRectF imageArea = qwtExpandToPixels(area, pixelRect);

        if ( imageArea.right() == xInterval.maxValue() &&
            !( xInterval.borderFlags() & QwtInterval::ExcludeMaximum ) )
        {
            imageArea.adjust(0, 0, pixelRect.width(), 0);
        }
        if ( imageArea.bottom() == yInterval.maxValue() &&
            !( yInterval.borderFlags() & QwtInterval::ExcludeMaximum ) )
        {
            imageArea.adjust(0, 0, 0, pixelRect.height() );
        }

        QSize imageSize;
        imageSize.setWidth( qRound( imageArea.width() / pixelRect.width() ) );
        imageSize.setHeight( qRound( imageArea.height() / pixelRect.height() ) );
        image = compose(xxMap, yyMap, 
            imageArea, paintRect, imageSize, doCache );
        if ( image.isNull() )
            return;

        imageRect = qwtStripRect(paintRect, area, 
            xxMap, yyMap, xInterval, yInterval);

        if ( ( image.width() > 1 || image.height() > 1 ) &&
            testPaintAttribute( PaintInDeviceResolution ) )
        {
            // Because of rounding errors the pixels 
            // need to be expanded manually to rectangles of 
            // different sizes

            image = qwtExpandImage(image, xxMap, yyMap, 
                imageArea, area, paintRect, xInterval, yInterval );
        }
    }

    painter->save();
    painter->setWorldTransform( QTransform() );
    
    QwtPainter::drawImage( painter, imageRect, image );

    painter->restore();
}