static inline Polygon qwtToPointsFiltered(
    const QRectF &boundingRect,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QwtSeriesData<QPointF> *series, int from, int to )
{
    // F.e. in scatter plots ( no connecting lines ) we
    // can sort out all duplicates ( not only consecutive points )

    Polygon polygon( to - from + 1 );
    Point *points = polygon.data();

    QwtPixelMatrix pixelMatrix( boundingRect.toAlignedRect() );

    int numPoints = 0;
    for ( int i = from; i <= to; i++ )
    {
        const QPointF sample = series->sample( i );

        const int x = qwtRoundValue( xMap.transform( sample.x() ) );
        const int y = qwtRoundValue( yMap.transform( sample.y() ) );

        if ( pixelMatrix.testAndSetPixel( x, y, true ) == false )
        {
            points[ numPoints ].rx() = x;
            points[ numPoints ].ry() = y;

            numPoints++;
        }
    }

    polygon.resize( numPoints );
    return polygon;
}
/*!
  \brief Draw symbols
  \param painter Painter
  \param symbol Curve symbol
  \param xMap x map
  \param yMap y map
  \param from index of the first point to be painted
  \param to index of the last point to be painted

  \sa setSymbol(), draw(), drawCurve()
*/
void QwtPlotCurve::drawSymbols(QPainter *painter, const QwtSymbol &symbol,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap, 
    int from, int to) const
{
    painter->setBrush(symbol.brush());
    painter->setPen(QwtPainter::scaledPen(symbol.pen()));

    const QwtMetricsMap &metricsMap = QwtPainter::metricsMap();

    QRect rect;
    rect.setSize(metricsMap.screenToLayout(symbol.size()));

    if ( to > from && d_data->paintAttributes & PaintFiltered )
    {
        const QRect window = painter->window();
        if ( window.isEmpty() )
            return;

        PrivateData::PixelMatrix pixelMatrix(window);

        for (int i = from; i <= to; i++)
        {
            const QPoint pi( xMap.transform(x(i)),
                yMap.transform(y(i)) );

            if ( pixelMatrix.testPixel(pi) )
            {
                rect.moveCenter(pi);
                symbol.draw(painter, rect);
            }
        }
    }
    else
    {
        for (int i = from; i <= to; i++)
        {
            const int xi = xMap.transform(x(i));
            const int yi = yMap.transform(y(i));

            rect.moveCenter(QPoint(xi, yi));
            symbol.draw(painter, rect);
        }
    }
}
/*!
  Draw dots

  \param painter Painter
  \param xMap x map
  \param yMap y map
  \param from index of the first point to be painted
  \param to index of the last point to be painted

  \sa draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()
*/
void QwtPlotCurve::drawDots(QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap, 
    int from, int to) const
{
    const QRect window = painter->window();
    if ( window.isEmpty() )
        return;

    const bool doFill = d_data->brush.style() != Qt::NoBrush;

    QwtPolygon polyline;
    if ( doFill )
        polyline.resize(to - from + 1);

    if ( to > from && d_data->paintAttributes & PaintFiltered )
    {
        if ( doFill )   
        {
            QPoint pp( xMap.transform(x(from)), yMap.transform(y(from)) );

            QwtPainter::drawPoint(painter, pp.x(), pp.y());
            polyline.setPoint(0, pp);

            int count = 1;
            for (int i = from + 1; i <= to; i++)
            {
                const QPoint pi(xMap.transform(x(i)), yMap.transform(y(i)));
                if ( pi != pp )
                {
                    QwtPainter::drawPoint(painter, pi.x(), pi.y());

                    polyline.setPoint(count, pi);
                    count++;

                    pp = pi;
                }
            }
            if ( int(polyline.size()) != count )
                polyline.resize(count);
        }
        else
        {
            // if we don't need to fill, we can sort out
            // duplicates independent from the order

            PrivateData::PixelMatrix pixelMatrix(window);

            for (int i = from; i <= to; i++)
            {
                const QPoint p( xMap.transform(x(i)),
                    yMap.transform(y(i)) );

                if ( pixelMatrix.testPixel(p) )
                    QwtPainter::drawPoint(painter, p.x(), p.y());
            }
        }
    }
    else
    {
        for (int i = from; i <= to; i++)
        {
            const int xi = xMap.transform(x(i));
            const int yi = yMap.transform(y(i));
            QwtPainter::drawPoint(painter, xi, yi);

            if ( doFill )
                polyline.setPoint(i - from, xi, yi);
        }
    }

    if ( doFill )
    {
        if ( d_data->paintAttributes & ClipPolygons )
            polyline = QwtClipper::clipPolygon(painter->window(), polyline);

        fillCurve(painter, xMap, yMap, polyline);
    }
}
Beispiel #4
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/*!
  Draw dots

  \param painter Painter
  \param xMap x map
  \param yMap y map
  \param from index of the first point to be painted
  \param to index of the last point to be painted

  \sa draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()
*/
void QwtPlotCurve::drawDots(QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    int from, int to) const
{
    const bool doFill = d_data->brush.style() != Qt::NoBrush;

    QwtPolygonF polyline;
    if ( doFill )
        polyline.resize(to - from + 1);

    if ( to > from && d_data->paintAttributes & PaintFiltered )
    {
		if ( doFill || d_data->canvasRect.isEmpty() )
        {
            QPointF pp( xMap.xTransform(x(from)), yMap.xTransform(y(from)) );

            QwtPainter::drawPoint(painter, pp.x(), pp.y());
            polyline[0] = pp;

            int count = 1;
            for (int i = from + 1; i <= to; i++)
            {
                const QPointF pi(xMap.xTransform(x(i)), yMap.xTransform(y(i)));
                if ( pi != pp )
                {
                    QwtPainter::drawPoint(painter, pi.x(), pi.y());

                    polyline[count] = pi;
                    count++;

                    pp = pi;
                }
            }
            if ( int(polyline.size()) != count )
                polyline.resize(count);
        }
        else
        {
            // if we don't need to fill, we can sort out
            // duplicates independent from the order

			PrivateData::PixelMatrix pixelMatrix(d_data->canvasRect);

            for (int i = from; i <= to; i++)
            {
                const QPointF p( xMap.xTransform(x(i)), yMap.xTransform(y(i)) );

                if ( pixelMatrix.testPixel(p.toPoint()) )
                    QwtPainter::drawPoint(painter, p.x(), p.y());
            }
        }
    }
    else
    {
        for (int i = from; i <= to; i++)
        {
            const double xi = xMap.xTransform(x(i));
            const double yi = yMap.xTransform(y(i));
            QwtPainter::drawPoint(painter, xi, yi);

            if ( doFill )
                polyline[i - from] = QPointF(xi, yi);
        }
    }

    if ( doFill )
    {
		if ( d_data->canvasRect.isValid() && (d_data->paintAttributes & ClipPolygons) )
			polyline = QwtClipper::clipPolygonF(d_data->canvasRect, polyline);

        fillCurve(painter, xMap, yMap, polyline);
    }
}