Re: How to set rotation using an existing API

Hi fireball,

On Nov 1, 2012, at 11:19 AM, fireball <[email protected]> wrote:

> I am using AffineTransform to rotate SVG elements but as far as I understand
> it only provides two methods to rotate. One sets it identity matrix with a
> rotation (setToRotation(theta)) and another rotates by a delta
> (rotate(theta)).
> 
> What I want to do is set rotation to specific angle. I.e. I don't want to
> set its matrix to identity matrix nor do I want to rotate by delta.

	The first method sets it to a specific rotation, not an identity matrix so it seems that is what you
want.


> I want to be able to set rotation like we can by setting 'rotate' attribute. Is
> there a way to do it using AffineTransform or another API?

	setToRotation does exactly what the 'rotate' function' does in the SVG transform attribute.

	I'm a little afraid that you are trying to adjust a general affine transform (that may have non-uniform
scaling and skew) so that it has a specific rotation. I'm afraid that is what you want to do because you can't 
really do it without coming up with a perhaps non-sensical definition of rotation...

	Thomas