C++ (Cpp) QwtPolygonF::count示例

示例#1

文件： qwt_clipper.cpp 项目： DTUautopilot/qgroundcontrol

void QwtPolygonClipperF::clipEdge(Edge edge, 
    const QwtPolygonF &pa, QwtPolygonF &cpa) const
{
    if ( pa.count() == 0 )
    {
        cpa.resize(0);
        return;
    }

    unsigned int count = 0;

    QwtDoublePoint p1 = pa[0];
    if ( insideEdge(p1, edge) )
        addPoint(cpa, count++, p1);

    const uint nPoints = pa.size();
    for ( uint i = 1; i < nPoints; i++ )
    {
        const QwtDoublePoint p2 = pa[(int)i];
        if ( insideEdge(p2, edge) )
        {
            if ( insideEdge(p1, edge) )
                addPoint(cpa, count++, p2);
            else
            {
                addPoint(cpa, count++, intersectEdge(p1, p2, edge));
                addPoint(cpa, count++, p2);
            }
        }
        else
        {
            if ( insideEdge(p1, edge) )
                addPoint(cpa, count++, intersectEdge(p1, p2, edge));
        }
        p1 = p2;
    }
    cpa.resize(count);
}

示例#2

文件： qwt_plot_curve.cpp 项目： BackupTheBerlios/qtiplot-svn

/*!
  Fill the area between the curve and the baseline with
  the curve brush

  \param painter Painter
  \param xMap x map
  \param yMap y map
  \param pa Polygon

  \sa setBrush(), setBaseline(), setCurveType()
*/
void QwtPlotCurve::fillCurve(QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    QwtPolygonF &pa) const
{
    if ( d_data->brush.style() == Qt::NoBrush )
        return;

    closePolyline(xMap, yMap, pa);
    if ( pa.count() <= 2 ) // a line can't be filled
        return;

    QBrush b = d_data->brush;
    if ( !b.color().isValid() )
        b.setColor(d_data->pen.color());

    painter->save();

    painter->setPen(QPen(Qt::NoPen));
    painter->setBrush(b);

    QwtPainter::drawPolygon(painter, pa);

    painter->restore();
}