[webkit-dev] Complex and Vector3 classes in WTF?

[Chris Marrin]

On Sep 1, 2010, at 1:48 PM, Simon Fraser wrote:

> On Sep 1, 2010, at 1:04 PM, Chris Marrin wrote:
> 
>> On Sep 1, 2010, at 12:29 PM, Maciej Stachowiak wrote:
>> 
>>> On Sep 1, 2010, at 11:43 AM, Chris Marrin wrote:
>>> 
>>>> 
>>>> But I agree with Maciej that all of the public API is transformation oriented. Even things like inverse() and transpose() have application in doing transforms. I think it would be a stretch to use this 4x4 matrix for general purposes. A general matrix class usually has to deal with different dimensions, for instance.
>>>> 
>>>> But I am loath to call it HomogeneousTransform, given the fact that Maciej and I have spelled it differently (both are accepted spellings) and it will be really hard for people to get used to spelling such an uncommon word.
>>>> 
>>>> If you look at the "Uses" section of http://en.wikipedia.org/wiki/Transformation_matrix you'll see that they consider the term improper as well. And they have a good point. Since they recommend the term "general transformation matrix" to distinguish it from the more restricted "affine transformation", then simply calling it Transform seems appropriate.
>>> 
>>> Transform sounds ok to me, actually, even though it is a little broad.
>> 
>> Filed as https://bugs.webkit.org/show_bug.cgi?id=45051. I also opened https://bugs.webkit.org/show_bug.cgi?id=45052 for the work to change Transform back to floats. I'm not sure we've fully committed to do this, but I wanted it recorded in the bug list. We can invalidate it if we don't end up doing it.
> 
> SVG already has SVGTransform, the interface for one of the component transformations within an SVGTransformList, which has an SVGMatrix property, which represents the matrix.
> 
> I think Transform is going to get too easily confused with existing transform terminology related to CSS and SVG transforms, and maybe XSLT too.

Alternative?

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~Chris
cmarrin at apple.com