C++ QwtMetricsMap::screenToLayoutX方法代码示例

void QwtPlot::printLegend(QPainter *painter, const QRect &rect) const
{
    if ( !legend() || legend()->isEmpty() )
        return;

    QLayout *l = legend()->contentsWidget()->layout();
    if ( l == 0 || !l->inherits("QwtDynGridLayout") )
        return;

    QwtDynGridLayout *legendLayout = (QwtDynGridLayout *)l;

    uint numCols = legendLayout->columnsForWidth(rect.width());
#if QT_VERSION < 0x040000
    QValueList<QRect> itemRects =
        legendLayout->layoutItems(rect, numCols);
#else
    QList<QRect> itemRects =
        legendLayout->layoutItems(rect, numCols);
#endif

    int index = 0;

#if QT_VERSION < 0x040000
    QLayoutIterator layoutIterator = legendLayout->iterator();
    for ( QLayoutItem *item = layoutIterator.current();
            item != 0; item = ++layoutIterator) {
#else
    for ( int i = 0; i < legendLayout->count(); i++ ) {
        QLayoutItem *item = legendLayout->itemAt(i);
#endif
        QWidget *w = item->widget();
        if ( w ) {
            painter->save();
            painter->setClipping(true);
            QwtPainter::setClipRect(painter, itemRects[index]);

            printLegendItem(painter, w, itemRects[index]);

            index++;
            painter->restore();
        }
    }
}

/*!
  Print the legend item into a given rectangle.

  \param painter Painter
  \param w Widget representing a legend item
  \param rect Bounding rectangle
*/

void QwtPlot::printLegendItem(QPainter *painter,
                              const QWidget *w, const QRect &rect) const
{
    if ( w->inherits("QwtLegendItem") ) {
        QwtLegendItem *item = (QwtLegendItem *)w;

        painter->setFont(item->font());
        item->drawItem(painter, rect);
    }
}

/*!
  \brief Paint a scale into a given rectangle.
  Paint the scale into a given rectangle.

  \param painter Painter
  \param axisId Axis
  \param startDist Start border distance
  \param endDist End border distance
  \param baseDist Base distance
  \param rect Bounding rectangle
*/

void QwtPlot::printScale(QPainter *painter,
                         int axisId, int startDist, int endDist, int baseDist,
                         const QRect &rect) const
{
    if (!axisEnabled(axisId))
        return;

    const QwtScaleWidget *scaleWidget = axisWidget(axisId);
    if ( scaleWidget->isColorBarEnabled()
            && scaleWidget->colorBarWidth() > 0) {
        const QwtMetricsMap map = QwtPainter::metricsMap();

        QRect r = map.layoutToScreen(rect);
        r.setWidth(r.width() - 1);
        r.setHeight(r.height() - 1);

        scaleWidget->drawColorBar(painter, scaleWidget->colorBarRect(r));

        const int off = scaleWidget->colorBarWidth() + scaleWidget->spacing();
        if ( scaleWidget->scaleDraw()->orientation() == Qt::Horizontal )
            baseDist += map.screenToLayoutY(off);
        else
            baseDist += map.screenToLayoutX(off);
    }

//.........这里部分代码省略.........

/*!
   Draw a text into a rectangle

   \param painter Painter
   \param rect Rectangle
*/
void QwtText::draw(QPainter *painter, const QRect &rect) const
{
    if ( d_data->paintAttributes & PaintBackground )
    {
        if ( d_data->backgroundPen != Qt::NoPen || 
            d_data->backgroundBrush != Qt::NoBrush )
        {
            painter->save();
            painter->setPen(QwtPainter::scaledPen(d_data->backgroundPen));
            painter->setBrush(d_data->backgroundBrush);
#if QT_VERSION < 0x040000
            QwtPainter::drawRect(painter, rect);
#else
            const QRect r(rect.x(), rect.y(), 
                rect.width() - 1, rect.height() - 1);
            QwtPainter::drawRect(painter, r);
#endif
            painter->restore();
        }
    }

    painter->save();

    if ( d_data->paintAttributes & PaintUsingTextFont )
    {
        painter->setFont(d_data->font);
    }

    if ( d_data->paintAttributes & PaintUsingTextColor )
    {
        if ( d_data->color.isValid() )
            painter->setPen(d_data->color);
    }

    QRect expandedRect = rect;
    if ( d_data->layoutAttributes & MinimumLayout )
    {
#if QT_VERSION < 0x040000
        const QFont font(painter->font());
#else
        // We want to calculate in screen metrics. So
        // we need a font that uses screen metrics

        const QFont font(painter->font(), QApplication::desktop());
#endif

        int left, right, top, bottom;
        d_data->textEngine->textMargins(
            font, d_data->text,
            left, right, top, bottom);

        const QwtMetricsMap map = QwtPainter::metricsMap();
        left = map.screenToLayoutX(left);
        right = map.screenToLayoutX(right);
        top = map.screenToLayoutY(top);
        bottom = map.screenToLayoutY(bottom);

        expandedRect.setTop(rect.top() - top);
        expandedRect.setBottom(rect.bottom() + bottom);
        expandedRect.setLeft(rect.left() - left);
        expandedRect.setRight(rect.right() + right);
    }

    d_data->textEngine->draw(painter, expandedRect, 
        d_data->renderFlags, d_data->text);

    painter->restore();
}

void Plot::printScale(QPainter *painter, int axisId, int startDist, int endDist, 
					  int baseDist, const QRect &rect) const
{
    if (!axisEnabled(axisId))
        return;

    const QwtScaleWidget *scaleWidget = axisWidget(axisId);
    if ( scaleWidget->isColorBarEnabled() 
        && scaleWidget->colorBarWidth() > 0)
    {
        const QwtMetricsMap map = QwtPainter::metricsMap();

        const QRect r = map.layoutToScreen(rect);
        scaleWidget->drawColorBar(painter, scaleWidget->colorBarRect(r));

        const int off = scaleWidget->colorBarWidth() + scaleWidget->spacing();
        if ( scaleWidget->scaleDraw()->orientation() == Qt::Horizontal )
            baseDist += map.screenToLayoutY(off);
        else
            baseDist += map.screenToLayoutX(off);
    }

    QwtScaleDraw::Alignment align;
    int x, y, w;

	const int bw2 = scaleWidget->penWidth() / 2;

    switch(axisId)
    {
        case yLeft:
        {
            x = rect.right() - baseDist + 1 - bw2;
            y = rect.y() + startDist;
            w = rect.height() - startDist - endDist;
            align = QwtScaleDraw::LeftScale;
            break;
        }
        case yRight:
        {
            x = rect.left() + baseDist;
			if (scaleWidget->penWidth() % 2 == 0)
				x += 1;

            y = rect.y() + startDist;
            w = rect.height() - startDist - endDist + bw2;
            align = QwtScaleDraw::RightScale;
            break;
        }
        case xTop:
        {
            x = rect.left() + startDist;
            y = rect.bottom() - baseDist + 1;
			if (scaleWidget->penWidth() % 2 == 0)
				y -= bw2;
            w = rect.width() - startDist - endDist;
            align = QwtScaleDraw::TopScale;
            break;
        }
        case xBottom:
        {
            x = rect.left() + startDist;
            y = rect.top() + baseDist;

			if (scaleWidget->penWidth() % 2 == 1)
				y += bw2;

            w = rect.width() - startDist - endDist + bw2;
            align = QwtScaleDraw::BottomScale;
            break;
        }
        default:
            return;
    }

    scaleWidget->drawTitle(painter, align, rect);

    painter->save();
    painter->setFont(scaleWidget->font());

    QPen pen = painter->pen();
    pen.setWidth(scaleWidget->penWidth());
    painter->setPen(pen);

    QwtScaleDraw *sd = (QwtScaleDraw *)scaleWidget->scaleDraw();
    const QPoint sdPos = sd->pos();
    const int sdLength = sd->length();

    sd->move(x, y);
    sd->setLength(w);

#if QT_VERSION < 0x040000
    sd->draw(painter, scaleWidget->palette().active());
#else
    QPalette palette = scaleWidget->palette();
    palette.setCurrentColorGroup(QPalette::Active);
    sd->draw(painter, palette);
#endif
    // reset previous values
    sd->move(sdPos); 
    sd->setLength(sdLength); 
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            break;
        }
        default:
            return;
    }

    const QwtScaleWidget *scaleWidget = axisWidget(axisId);
    scaleWidget->drawTitle(painter, align, rect);

    painter->save();
    painter->setFont(scaleWidget->font());

    QwtScaleDraw *sd = (QwtScaleDraw *)scaleWidget->scaleDraw();
    const QPoint sdPos = sd->pos();
    const int sdLength = sd->length();

    sd->move(x, y);
    sd->setLength(w);

#if QT_VERSION < 0x040000
    sd->draw(painter, scaleWidget->palette().active());
#else
    QPalette palette = scaleWidget->palette();
    palette.setCurrentColorGroup(QPalette::Active);
    sd->draw(painter, palette);
#endif
    // reset previous values
    sd->move(sdPos); 
    sd->setLength(sdLength); 

    painter->restore();
}

/*!
  Print the canvas into a given rectangle.

  \param painter Painter
  \param map Maps mapping between plot and paint device coordinates
  \param canvasRect Bounding rectangle
  \param pfilter Print filter
  \sa QwtPlotPrintFilter
*/

void QwtPlot::printCanvas(QPainter *painter, const QRect &canvasRect,
    const QwtArray<QwtScaleMap> &map, const QwtPlotPrintFilter &pfilter) const
{
    if ( pfilter.options() & QwtPlotPrintFilter::PrintCanvasBackground )
    {
        painter->setPen(Qt::NoPen);

        QBrush bgBrush;
#if QT_VERSION >= 0x040000
            bgBrush = canvas()->palette().brush(backgroundRole());
#else
        QColorGroup::ColorRole role =
            QPalette::backgroundRoleFromMode( backgroundMode() ); 
        bgBrush = canvas()->colorGroup().brush( role );
#endif
        painter->setBrush(bgBrush);
        
        int x1 = 0;
        int x2 = 0;
        int y1 = 0;
        int y2 = 0;

#if QT_VERSION >= 0x040000
        switch(painter->device()->paintEngine()->type())
        {
            case QPaintEngine::PostScript:
                x2 = 1;
                y2 = 1;
                break;
            default:;
        }
#endif

        const QwtMetricsMap map = QwtPainter::metricsMap();
        x1 = map.screenToLayoutX(x1);
        x2 = map.screenToLayoutX(x2);
        y1 = map.screenToLayoutY(y1);
        y2 = map.screenToLayoutY(y2);

        QwtPainter::drawRect(painter, 
            canvasRect.x() + x1, canvasRect.y() + y1, 
            canvasRect.width() - x2, canvasRect.height() - y2); 
    }
    else
    {
        // Paint the canvas borders instead.
        painter->setPen(QPen(Qt::black));
        painter->setBrush(QBrush(Qt::NoBrush));
        QwtPainter::drawRect(painter, canvasRect); 
    }


    painter->setClipping(true);
    QwtPainter::setClipRect(painter, canvasRect);

    drawItems(painter, canvasRect, map, pfilter);
}