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Animating with QGLWidget OpenGL

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  • J Offline
    J Offline
    JerichoJosh
    wrote on last edited by
    #1

    Hi,

    I'm a beginner with graphics programming, but I do want to program quite low-level (it must be fast, for a project).
    I would like to know how to use the drawing methods in the "Hello-OpenGL"-example for animation.

    "Hello-OpenGL-example (from http://qt-project.org/wiki/developer-guides)":http://download.qt-project.org/learning/developerguides/qtopengltutorial/opengl_src.zip

    I've already used these drawing methods (initalizeGL(), resizeGL() and painGL() ) to draw a few things.

    My question is: how do I make this white triangle translate and rotate an x-amount per second?

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    • J Offline
      J Offline
      john_god
      wrote on last edited by
      #2

      Hi
      You have to declare a QTimer event in your widget. Then on your TimerEvent you update your translation and rotation matrices.
      Check this example http://qt-project.org/doc/qt-5.0/qtgui/openglwindow.html
      right now I'm not sure but I think it's animated.

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      • J Offline
        J Offline
        JerichoJosh
        wrote on last edited by
        #3

        Thanks, I'll have a look at it and come back to you later..

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        • J Offline
          J Offline
          JerichoJosh
          wrote on last edited by
          #4

          The example link you gave is an animation.
          However, it doesn't use QTimer at all.
          Could you explain with code what exactly you mean with:
          "Then on your TimerEvent you update your translation and rotation matrices."
          ?

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          • J Offline
            J Offline
            JerichoJosh
            wrote on last edited by
            #5

            This does not answer my question, could somebody please help?

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