Setting QwtPlot's canvas as Transparent wthout stylesheet way?

**umituzun84** · 15th March 2011, 16:54

Hi All,

How can I set my QwtPlot's canvas as transparent? I want to see all my running curves and canvas background in same screen. My settings like that;

Qt Code:

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plotHandle->canvas()->setPaintAttribute(QwtPlotCanvas::BackingStore, true);
    plotHandle->canvas()->setPaintAttribute(QwtPlotCanvas::Opaque, false);
 
    QPalette palette = plotHandle->canvas()->palette();
    palette.setBrush(QPalette::Window, QBrush(QColor(0, 0, 0, 0)));
    privateData.plotHandle->canvas()->setBackgroundRole(QPalette::Window);
    privateData.plotHandle->canvas()->setPalette(palette);
    privateData.plotHandle->canvas()->setAutoFillBackground(false);

plotHandle->canvas()->setPaintAttribute(QwtPlotCanvas::BackingStore, true);
    plotHandle->canvas()->setPaintAttribute(QwtPlotCanvas::Opaque, false);

    QPalette palette = plotHandle->canvas()->palette();
    palette.setBrush(QPalette::Window, QBrush(QColor(0, 0, 0, 0)));
    privateData.plotHandle->canvas()->setBackgroundRole(QPalette::Window);
    privateData.plotHandle->canvas()->setPalette(palette);
    privateData.plotHandle->canvas()->setAutoFillBackground(false);

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But my canvas seem not transparent until I set the BackingStore attribute to false.
This time I can see background of canvas but replot function doesn't work and my curves draw's the same screen in overlapped way without cleaning the canvas.

How can I make my canvas transparent?
Thanks in advance.