Agg backends (in addition to the ps backend) now support affine-transformed image. Regards,
-JJ On Thu, Dec 17, 2009 at 7:05 PM, Jae-Joon Lee <lee.j.j...@gmail.com> wrote: > On Thu, Dec 17, 2009 at 5:03 PM, Andrew Straw <straw...@astraw.com> wrote: >> It's not clear to me if this proposal lets one specify any arbitrary affine >> transformation. Does it? > > I believe it does. 3 coordinates will define 6 equations where we have > 6 unknowns of the affine matrix. > The question is how user want to specify the transform. > The extended extent keyword would be useful for the cases like the > pseudo-perspective projection that you mentioned. But, it will not be > very convenient for the cases like simple rotation. > > >> >> In general -- very nice. Thanks. >> >> In specific, I think the way you have already implemented things is >> sufficient. I think if a user can write a little helper function (as in your >> demo) to avoid a dumbed-down API being part of MPL, that would be best. >> Anyone specifying their own affine transform is probably going to want a >> pretty precise level of control, anyway. (Of course if your extent keyword >> proposal is already a general purpose API, then please ignore this comment.) > > I, personally, don't like the idea that user needs to define his/her > own transform to rotate/skew the image. Rotation and skew seems more > like properties of the image, rather than the transform. > > Anyhow, unless others step in, I may leave it as is (partially because > I don't have much use case for rotated/skewed images for now). And, I > hope someone implement similar affine transform for other backends. > For the backends that requires resampling (agg, etc.), it might be > better if the affine transform is taken care during the resampling > (i.e., in the Image.draw method) rather than to be delegated to the > backends. > > Regards, > > -JJ > >> >> -Andrew >> >
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