> You can apply the inverse of the matrix of the origin transformation,
> then the transformation matrix itself, and the restore the origin
> transformation again by applying the origin transformation matrix once
> more time.
Yes, I has already implemented this solution. But now i understand that
such behaviour of origin is unusable. Main transformation represented in
internal units of 'origin-space'. Bone matrix represented in global units.
So we always need to know both 'origin_transformation' and
'transformation' values to apply bone matrix properly.
So, I reimplemented transformation feature with other rules:
Layer_PasteCanvas have three new params:
- origin_transformation
- transformation
- enable_transformation (boolean)
Calculation of actual transformation:
actual_transformation_matrix =
transformation.get_matrix() *
origin_transformation.get_matrix().invert();
Behavior of handles (ducks):
- when transformation enabled, handles allow user to modify
'transformation' param, and group will transformed at the screen.
- when transformation disabled, user sees group in original position
without any transformation, and handles allow user to modify
'origin_transformation'.
> What I wanted to ask is that you can do internally the calculations as
> matrixes, so inverse are quite easy to calculate just transposing the
> matrix due to their orthogonal property.
Now internally transformation represented as offset, angle, skew angle and
scale variables. Also methods get_matrix and set_matrix allow to use
transformation as matrix. Transformation can be converted to matrix and
matrix can be converted back to transformation.
When we apply more then one orthogonal transformations we may loose
orthogonality, so in common case matrixes is not orthogonal and i've used
common function to calculate inverted matrix.
------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clktrk
_______________________________________________
Synfig-devl mailing list
Synfig-devl@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/synfig-devl
