[SOLVED] Color Gradient for QBrush customization (Qwt Plot Background)



  • So what I am trying to accomplish right now is making a Color Gradient for a QwtPlot canvas background color through code because the colors are going to change dynamically.

    So for example: The plot scale for the x axis goes from 0 - 2000
    red background from 0 - 500
    yellow background from 501 - 750
    green background from 750 - 1250
    yellow background from 751 - 1500
    red background from 1501 - 2000

    The only way I can think of doing this would be to use a custom QBush using a gradient that does the above. I would like to be able to set the limits of each color though... I looked at the spectrogram example and found some cool color meshing techniques but unfortunately they are unavailable using a straight QwtPlot.

    i.e. function
    setCanvasBackground(const QBrush &);

    Any ideas?


  • Moderators

    Have you looked at "QLinearGradient?":http://qt-project.org/doc/qt-4.8/qlineargradient.html



  • exactly what i was looking for, even lets you do multiple colors! and unfortunately google was of no help with pointing me to this gold mine.

    Thanks!


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