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Thread: How use QwtPainter?

  1. #1
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    Angry How use QwtPainter?

    I want to draw an auxiliary line on the QwtPlot. The line should connect two points. I don't want use the QwtPlotCurve to achieve the goal. The class QwtPainter contains function drawLine, but I don't understand how to use this.

    How to draw a line on the QwtPlot?

  2. #2
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    Default Re: How use QwtPainter?

    You can't just draw - you have to do it inside the draw method of an item, or inside the paint event of the canvas. ( for stuff like rubberbands, cursors you would also have the option to use a widget overlay, but this more advanced stuff ).

    What about simply using a QwtPlotShapeItem - a line can easily be expressed as QPainterPath ?

    Uwe
    Last edited by Uwe; 9th December 2015 at 14:02.

  3. The following user says thank you to Uwe for this useful post:

    d1mbarus (15th December 2015)

  4. #3
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    Default Re: How use QwtPainter?

    This is a good alternative solution. Thank you!

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