C++ QwtLegendItem::setSymbol方法代码示例

//!  Update the widget that represents the curve on the legend
void QwtPlotCurve::updateLegend(QwtLegend *legend) const
{
    if ( !legend )
        return;

    QwtPlotItem::updateLegend(legend);

    QWidget *widget = legend->find(this);
    if ( !widget || !widget->inherits("QwtLegendItem") )
        return;

    QwtLegendItem *legendItem = (QwtLegendItem *)widget;

#if QT_VERSION < 0x040000
    const bool doUpdate = legendItem->isUpdatesEnabled();
#else
    const bool doUpdate = legendItem->updatesEnabled();
#endif
    legendItem->setUpdatesEnabled(false);

    const int policy = legend->displayPolicy();

    if (policy == QwtLegend::FixedIdentifier)
    {
        int mode = legend->identifierMode();

        if (mode & QwtLegendItem::ShowLine)
            legendItem->setCurvePen(pen());

        if (mode & QwtLegendItem::ShowSymbol)
            legendItem->setSymbol(symbol());

        if (mode & QwtLegendItem::ShowText)
            legendItem->setText(title());
        else
            legendItem->setText(QwtText());

        legendItem->setIdentifierMode(mode);
    }
    else if (policy == QwtLegend::AutoIdentifier)
    {
        int mode = 0;

        if (QwtPlotCurve::NoCurve != style())
        {
            legendItem->setCurvePen(pen());
            mode |= QwtLegendItem::ShowLine;
        }
        if (QwtSymbol::NoSymbol != symbol().style())
        {
            legendItem->setSymbol(symbol());
            mode |= QwtLegendItem::ShowSymbol;
        }
        if ( !title().isEmpty() )
        {
            legendItem->setText(title());
            mode |= QwtLegendItem::ShowText;
        }
        else
        {
            legendItem->setText(QwtText());
        }
        legendItem->setIdentifierMode(mode);
    }

    legendItem->setUpdatesEnabled(doUpdate);
    legendItem->update();
}

/*! 
   Reset color and fonts of a plot
   \sa apply()
*/
void QwtPlotPrintFilter::reset(QwtPlot *plot) const
{
    if ( d_data->cache == 0 )
        return;

    const bool doAutoReplot = plot->autoReplot();
    plot->setAutoReplot(false);

    const PrivateData::Cache &cache = *d_data->cache;

    if ( plot->titleLabel() )
    {
        QwtTextLabel* title = plot->titleLabel();
        if ( title->text().testPaintAttribute(QwtText::PaintUsingTextFont) )
        {
            QwtText text = title->text();
            text.setColor(cache.titleColor);
            title->setText(text);
        }
        else
        {
            QPalette palette = title->palette();
            palette.setColor(
                QPalette::Active, Palette::Text, cache.titleColor);
            title->setPalette(palette);
        }

        if ( title->text().testPaintAttribute(QwtText::PaintUsingTextFont) )
        {
            QwtText text = title->text();
            text.setFont(cache.titleFont);
            title->setText(text);
        }
        else
        {
            title->setFont(cache.titleFont);
        }
    }

    if ( plot->legend() )
    {
#if QT_VERSION < 0x040000
        QValueList<QWidget *> list = plot->legend()->legendItems();
        for ( QValueListIterator<QWidget *> it = list.begin();
            it != list.end(); ++it )
#else
        QList<QWidget *> list = plot->legend()->legendItems();
        for ( QList<QWidget*>::iterator it = list.begin();
            it != list.end(); ++it )
#endif
        {
            QWidget *w = *it;

            if ( cache.legendFonts.contains(w) )
                w->setFont(cache.legendFonts[w]);

            if ( w->inherits("QwtLegendItem") )
            {
                QwtLegendItem *label = (QwtLegendItem *)w;
                const QwtPlotItem *plotItem = 
                    (const QwtPlotItem*)plot->legend()->find(label);

                QwtSymbol symbol = label->symbol();
                if ( cache.curveSymbolPenColors.contains(plotItem) )
                {
                    QPen pen = symbol.pen();
                    pen.setColor(cache.curveSymbolPenColors[plotItem]);
                    symbol.setPen(pen);
                }

                if ( cache.curveSymbolBrushColors.contains(plotItem) )
                {
                    QBrush brush = symbol.brush();
                    brush.setColor(cache.curveSymbolBrushColors[plotItem]);
                    symbol.setBrush(brush);
                }
                label->setSymbol(symbol);

                if ( cache.curveColors.contains(plotItem) )
                {
                    QPen pen = label->curvePen();
                    pen.setColor(cache.curveColors[plotItem]);
                    label->setCurvePen(pen);
                }
            }
        }
    }
    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
    {
        QwtScaleWidget *scaleWidget = plot->axisWidget(axis);
        if ( scaleWidget )
        {
            QPalette palette = scaleWidget->palette();
            palette.setColor(QPalette::Active, Palette::Foreground,
                             cache.scaleColor[axis]);
            scaleWidget->setPalette(palette);
//.........这里部分代码省略.........

/*! 
  Change color and fonts of a plot
  \sa apply()
*/
void QwtPlotPrintFilter::apply(QwtPlot *plot) const
{
    const bool doAutoReplot = plot->autoReplot();
    plot->setAutoReplot(false);

    delete d_data->cache;
    d_data->cache = new PrivateData::Cache;

    PrivateData::Cache &cache = *d_data->cache;

    if ( plot->titleLabel() )
    {
        QPalette palette = plot->titleLabel()->palette();
        cache.titleColor = palette.color(
            QPalette::Active, Palette::Text);
        palette.setColor(QPalette::Active, Palette::Text,
                         color(cache.titleColor, Title));
        plot->titleLabel()->setPalette(palette);

        cache.titleFont = plot->titleLabel()->font();
        plot->titleLabel()->setFont(font(cache.titleFont, Title));
    }
    if ( plot->legend() )
    {
#if QT_VERSION < 0x040000
        QValueList<QWidget *> list = plot->legend()->legendItems();
        for ( QValueListIterator<QWidget *> it = list.begin();
            it != list.end(); ++it )
#else
        QList<QWidget *> list = plot->legend()->legendItems();
        for ( QList<QWidget*>::iterator it = list.begin();
            it != list.end(); ++it )
#endif
        {
            QWidget *w = *it;

            cache.legendFonts.insert(w, w->font());
            w->setFont(font(w->font(), Legend));

            if ( w->inherits("QwtLegendItem") )
            {
                QwtLegendItem *label = (QwtLegendItem *)w;

                QwtSymbol symbol = label->symbol();
                QPen pen = symbol.pen();
                QBrush brush = symbol.brush();

                pen.setColor(color(pen.color(), CurveSymbol));
                brush.setColor(color(brush.color(), CurveSymbol));

                symbol.setPen(pen);
                symbol.setBrush(brush);
                label->setSymbol(symbol);

                pen = label->curvePen();
                pen.setColor(color(pen.color(), Curve));
                label->setCurvePen(pen);
            }
        }
    }
    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
    {
        QwtScaleWidget *scaleWidget = plot->axisWidget(axis);
        if ( scaleWidget )
        {
            cache.scaleColor[axis] = scaleWidget->palette().color(
                QPalette::Active, Palette::Foreground);
            QPalette palette = scaleWidget->palette();
            palette.setColor(QPalette::Active, Palette::Foreground,
                             color(cache.scaleColor[axis], AxisScale));
            scaleWidget->setPalette(palette);

            cache.scaleFont[axis] = scaleWidget->font();
            scaleWidget->setFont(font(cache.scaleFont[axis], AxisScale));

            cache.scaleTitle[axis] = scaleWidget->title();

            QwtText scaleTitle = scaleWidget->title();
            if ( scaleTitle.testPaintAttribute(QwtText::PaintUsingTextColor) )
            {
                cache.scaleTitleColor[axis] = scaleTitle.color();
                scaleTitle.setColor(
                    color(cache.scaleTitleColor[axis], AxisTitle));
            }

            if ( scaleTitle.testPaintAttribute(QwtText::PaintUsingTextFont) )
            {
                cache.scaleTitleFont[axis] = scaleTitle.font();
                scaleTitle.setFont(
                    font(cache.scaleTitleFont[axis], AxisTitle));
            }

            scaleWidget->setTitle(scaleTitle);

            int startDist, endDist;
            scaleWidget->getBorderDistHint(startDist, endDist);
//.........这里部分代码省略.........