Rendering an image within QwtPlot

[ttvo]

Hi all,

How can I attach an image file to QwtPlot as if it's a QwtPlotCurve so that I'll get to use the axis, legend, selection, zoom, etc ...

It seems that subclassing the QwtPlotRasterItem may be it, but I don't know how to override the renderImage method.

QImage OverlayImagePlot::renderImage(const QwtScaleMap &xMap, 
    const QwtScaleMap &yMap, const QwtDoubleRect &area) const
{
  //return QImage(_filename);
}

QImage OverlayImagePlot::renderImage(const QwtScaleMap &xMap, 
    const QwtScaleMap &yMap, const QwtDoubleRect &area) const
{
  //return QImage(_filename);
}

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Thanks