Hi, Carlos! Actual transformation splitted by two parts 'transformation' and 'origin_transformation'.
'origin_transformation' determines rotation center and angles of apllying X and Y scaling. Also it determines visual representation of transformation handles in workarea. Main condition of such splitting is - 'origin_transformation' should have no effect when 'transformation' is identity. 'origin_transformation' only determines how 'transformation' will applied. So transformation matrix can be calculated only for both parameters 'origin_transformation' and 'transformation' (not for each one). Anyway I'll think about generic solution how to split matrix to origin and transformation parts. Ivan > Hi! > I'm following the changes being made in the bones branch by Ivan. > > The Transformation class (as a new type) is a great idea and its > representation as composite of rotation, translation and both scales is > great. From the point of view of the user it is good, because user can > fine > tune the values editing them manually. > > But I wonder why internally it is not represented as a matrix. With a > 3x3 matrix (augmented 2x2 matrix [1]) it is possible to produce not only > rotation translation and scale but also shear mapping perspective > projection or homothety due to the properties of the affine > transformations > [2]. Then we could use that matrix in other kind of effects without need > to > rewrite more code since the matrix algebra is exactly the same. > > Cheers, Carlos > > [1] http://en.wikipedia.org/wiki/Augmented_matrix > [2] http://en.wikipedia.org/wiki/Affine_transformation > > > -- > Carlos > http://synfig.org > ------------------------------------------------------------------------------ > Shape the Mobile Experience: Free Subscription > Software experts and developers: Be at the forefront of tech innovation. > Intel(R) Software Adrenaline delivers strategic insight and game-changing > conversations that shape the rapidly evolving mobile landscape. Sign up > now. > http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk_______________________________________________ > Synfig-devl mailing list > Synfig-devl@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/synfig-devl > ------------------------------------------------------------------------------ Shape the Mobile Experience: Free Subscription Software experts and developers: Be at the forefront of tech innovation. Intel(R) Software Adrenaline delivers strategic insight and game-changing conversations that shape the rapidly evolving mobile landscape. Sign up now. http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk _______________________________________________ Synfig-devl mailing list Synfig-devl@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/synfig-devl
