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Thread: The coordinate system

  1. #1
    Join Date
    May 2006
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    Qt products
    Qt4
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    Default The coordinate system

    Hi, i have a problem with the coordinate system

    In the windows coordante the y-axis is this:
    |------> X
    |
    |
    v Y

    But i need (beacause the calculates needed) this coordinate system:
    ^Y
    |
    |------>X

    I can change the view with QMatrix with this instruction:
    Qt Code:
    1. QMatrix MyMatrix;
    2. MyMatrix.scale(1,-1);
    3. GraphicView->setMatrix(MyMatrix);
    To copy to clipboard, switch view to plain text mode 

    I need this for my draws in tha scene, but i need put a text in the scene, and with this action the text also is reflected, then:

    How I can change the coordinate system for my drawings and it does not to the text?

    Sorry for my bad english

  2. #2
    Join Date
    Jan 2006
    Location
    Warsaw, Poland
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    Qt products
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    Platforms
    Unix/X11 Windows

    Default Re: The coordinate system

    How about setting the QGraphicsItem::ItemIgnoresTransformations flag to true?

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