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- Date: Tue, 01 May 2012 23:01:30 +0000
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https://www.w3.org/Bugs/Public/show_bug.cgi?id=16406 --- Comment #4 from Dirk Schulze <dschulze@adobe.com> 2012-05-01 23:01:29 UTC --- Based on the comments on [1] so far I modified the text to: "" <h2 id="#two-dimensional-subset"> Two Dimensional Subset </h2> <p> UAs might just support two-dimensional transformations as a subset of this specification. In this case <a href="#three-d-transform-functions">three-dimensional transforms</a> and the properties 'transform-style', 'perspective', 'perspective-origin' and 'backface-visibility' must not be supported. Section <a href="#transform-3d-rendering">3D Transform Rendering</a> does not apply. Matrix decomposing uses the technique taken from the "unmatrix" method in "Graphics Gems II, edited by Jim Arvo", simplified for the 2D case. Section <a href="#mathematical-description">Mathematical Description of Transform Functions</a> is still effective but can be reduced by using a 3x3 transformation matrix where <em>a</em> equals <em>m11</em>, <em>b</em> equals <em>m12</em>, <em>c</em> equals <em>m21</em>, <em>d</em> equals <em>m22</em>, <em>e</em> equals <em>m41</em> and <em>f</em> equals <em>m42</em> (see <a href="#MatrixDefined">A 2D 3x2 matrix with six parameter</a>). </p> <img src="3x3matrix.png" alt="3x3 matrix" title="\begin{bmatrix} a & c & e \\ b & d & f \\ 0 & 0 & 1 \end{bmatrix}" width="82" height="79"> <div class="example"> <p> Authors can easily provide a fallback for UAs without 3D support. The following example has two property definitions for 'transform'. The first one consists of two two-dimensional transform functions. The second one has a two-dimensional and a three-dimensional transform function. </p> <pre>div { transform: scale(2) rotate(45deg); transform: scale(2) rotate3d(0, 0, 1, 45deg); }</pre> <p> For a UA with 3D support, the second definition will override the first one. For a UA without 3D support, the second definition is invalid and it falls back to the first definition. </p> </div> "" [1] http://lists.w3.org/Archives/Public/public-fx/2012AprJun/0089.html -- Configure bugmail: https://www.w3.org/Bugs/Public/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug.

Received on Tuesday, 1 May 2012 23:01:33 UTC