From: Benjamin Himpel <bhimpel@yahoo.com>

Date: Sun, 19 Jan 2003 16:29:16 -0800 (PST)

Message-ID: <20030120002916.83555.qmail@web41402.mail.yahoo.com>

To: www-svg@w3.org

Date: Sun, 19 Jan 2003 16:29:16 -0800 (PST)

Message-ID: <20030120002916.83555.qmail@web41402.mail.yahoo.com>

To: www-svg@w3.org

Hi, Why can one not use animateTransform together with matrix? Why does the specification not allow expressions like the following? <animateTransform attributeName="transform" attributeType="XML" type="matrix" from="1,0,0,1,0,0" to="2,3,1,2,1,1" dur="5s" additive="sum" fill="freeze"/> One could simply define this to be the animation, which follows the straight line between the two transformation matrices with constant speed. I found the following excerpt in some newsgroup, but do not remember which: "Because of mathematical issues, we couldn't allow arbitrary matrics to be part of the animation values. You can only animate primitive operations such as rotate, scale or translate. But you can define additive 'animateTransform' animations on the same 'transform' attribute in such a way that you can achieve most arbitrary matrix effects. Bottom line - you should be able to do just about everything you can do with a matrix using some combination of 'animateTransform' animations." I do not understand, what mathematical issues would relevant here. As matter of fact mathematicians would not mind to simply specify the path (including its parametrization) of transformation matrices instead of the complicated and inefficient way of using compositions of animations for primitive transformations. Also it is much more difficult than it seems, to find the _animated_ composition of primitive transformation which is equal to a specified path (including parametrization) of transformation matrices. Does anybody have an answer to or comments about any of this? Thanks, Ben __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.comReceived on Sunday, 19 January 2003 19:33:18 UTC

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