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D3DXSprite position

Started by JariRG Feb 25, 2011 at 11:47 PM 1 replies 1k views

Original Post

Feb 25, 2011 at 11:47 PM

Im trying to get the position (_41, _42) from the constructed matrix (D3DXMatrixTransformation2D). The main problem is, when rotation is not 0, the position from matrix is rotated too. The rotation center is set to half size of texture (rectangle), and it doesn't seems to rotate position around this RotationCenter point. If the rotation value is 0, then the position vector from matrix is exactly what it should be.
It's a hierarchical system, so i cant just use the Position what set by the user, i must reconstruct after D3DXSprite's SetTransform call.

Why rotates the Position? Or how can i restore the correct position value?

EDIT: I forgot to mention, the sprite is rendered the correct position to the screen!

JariRG

Feb 26, 2011 at 11:20 AM

I did a video to better show my problem:

You can see the gear sprites: rendered to the good position, but the bounding rectangle is rotated.
The bounding rectangles top/left are calculated:


 ...
 _dxSprite->SetTransform(matTransform); 
 ...
 _onScreenRect.left = matTransform->_41;
 _onScreenRect.top = matTransform->_42;

The ship is rendered this way too, but no rotation set (the value is 0), and the bounding rect's positions are ok.

Ideas?

Thanks.

JariRG

Feb 27, 2011 at 11:33 AM

Bump.

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