[Interest] QGraphicsRotation in QGraphicsViewScene

[Philipp Menke]

I have no Idea if it will work with QGraphicScene, but if you use 
translations and rotations in R³ you have to think about the order of 
them. T * R * v != R * T * v (with T = Translationmatrix, R = 
Rotationmatrix and v = vector). So Try setting the position of the item 
to 0|0|0, perform the rotation and translation with matrices and play 
with permutating them.

Cheers

Philipp

On 12.09.2012 12:24, Till Oliver Knoll wrote:
>
>
>
>
> Am 12.09.2012 um 11:19 schrieb "Duan,Lin" <linduan at isoftstone.com 
> <mailto:linduan at isoftstone.com>>:
>
>> ...
>>
>> How can I do , so it can performed as expected (first graph)?
>>
>
> I think you can't: from what I understand you are trying to perform a 
> rotation in 3D space, whereas QGraphicsScene/View only manage 2D (or 
> "pseudo 3D" aka 2.5D, if you take the "depth" z-coordinate into 
> account) objects.
>
> Use a "proper" 3D scene (QGLWidget) or try the new "Qt Quick3D" module!
>
> Cheers,
>   Oliver
>
>
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