Setup a QGraphicsView with Bottom Left Coordinate origin ?



  • Hi ,

    I am writing an application that display a series of layered tracks when the first track is at the bottom of the Scene .
    I currently adjust all the y position of my widget based on the height of the scene for my tracks are base on a bottom left origin but it is not very clean .

    is there a good way to setup a scene so new item coordinate are in a bottom Left origin coordinate system ?

    Thanks

    Damien



  • You could apply a transformation matrix that basically does this coordinates change for you and apply at the root element of your QGraphicsScene.



  • Cool but wouldn't all my Item inside the View been flipped as well ?
    as if I apply a scale(1,-1) to flip the y direction axis and then the transform to reset the origin .
    the "space" woulld be upside down ? would I have then to also scale(-1,1) all my childs item so they are the right way around ?

    I will do some test, I want to try to do it the correct way rather than "a way" that kinda works :)

    Thanks for your reply

    Damien


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