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POC++ Direct2D Matrix transformation mirror
 

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  1. POC++ Direct2D Matrix transformation mirror
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    <p>I am currently learning DirectX (SDK of June 2010) and am drawing bitmaps to screen. Now I want to be able to do transformations on these images, and fail to mirror the images along the x- or y- axis.</p> <p>Before drawing, I am able to set a transformation matrix that will be applied to the drawing operations. Though DirectX is using the D2D1_MATRIX_3x2_F type, according to MSDN, only a 2x2 part of this matrix is used for transformations. For example, the matrix { [1, 0], [0, 1], [0, 0] } is the identity matrix that causes everything to be displayed naturally.</p> <p>As I understand it, a matrix transformation to mirror my image along the x-axis should look like this: { [1, 0], [0, -1], [0, 0] }, and along the y-axis it would then be { [-1, 0], [0, 1], [0, 0] }. If I use these matrices for the transformation however, I get a black screen.</p> <p>The problem for me is, that I am kind of stuck at this point without ideas what this problem could be caused by, or rather whether it is caused by a logical error in the mathematics behind this, or the implementation itself. Unfortunately, I could not find any material on this, besides a one line comment that "mirroring has to be done with matrix transformations" in the header file of the Direct2D RenderTarget.</p> <p>The source code I am currently using for testing this is:</p> <pre><code>D2D1_MATRIX_3X2_F m; m._11 = 1; m._12 = 0; m._21 = 0; m._22 = -1; m._31 = 0; m._32 = 0; m_pDX2DRenderTarget-&gt;SetTransform( m ); </code></pre>
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