Boost logo

Geometry :

Subject: [ggl] Efficient rotation about a point
From: Lee (lee)
Date: 2009-12-01 21:08:04

Mateusz Loskot wrote:
> Barend Gehrels wrote:
>>> Thanks Barend, Stephen.
>>> Barend, since GGL transformers aren't composable, wouldn't it be
>>> right for GGL to provide some type of transformer taking a matrix as
>>> its constructor parameter?
>> Yes, I think that is a good idea. Will be solved (either done, or
>> maybe they should be composable).
> I was thinking about it yesterday.
> For now, wouldn't it be sufficient to use ublas_transformer
> and enable compositions [1] with a simple custom matrix [2] in similar
> manner as Boost.GIL does it.
> [1]
> [2]
> Best regards,
I wonder, is there really any benefit in having composable-matrix +
ublas_transformer over having
composable (affine) transformers?

As a user, I'm looking at the existing rotate/translate/scale
transformers and being frustrated by the
thought "if only I could compose these things!". Is matrix +
ublas_transformer really the answer to

Geometry list run by mateusz at