Hi Axel,
> ... but rotate an element which resides inside of a group things get
> more complicated. I tried with inkscape and found it will apply a
> matrix and also change the width and height and even the stroke-width
width and height and stroke-width won't change if you set "Store
transformation = Preserved" in Inkscape Preferences.
Concerning transformations inside groups: Let A be the transform matrix
of an object and B the accumulated transformations of all its parent
groups. The absolute transformation of the object is
T = B * A
Now you want to transform this object by matrix C, gives you
T' = C * T
= C * B * A
= B * B.inverse * C * B * A
= B * A'
with
A' = B.inverse * C * B * A
That's it :-)
Regards,
Thomas
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