Setting 0,0 point in top left corner with qt and open gl

  • Hello, i want to setting like the topic says:

    QMatrix4x4 mtrx;

    when i set X and Y of rectangle to 0,0 open gl drawing it in bottom left corner, as i said before i need point 0,0 in top left corner

    QMatrix4x4 mtrx;

    this piece of code does not drawing anything in my QGLWidget in any position i set.
    Can someone tell me where is the problem, thanks in advance

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