Re: Best way to get the the bbox of an element with respect to its transformations?

I think, this will not be sufficient just to transform the
user-space bounding box. Because the bounding box is
always aligned along the x- and y-axis, already a simple
rotation can result in a complete different bounding box
not neccessarily related to the screen bounding box of
the rotated user-space bounding box. 

For a bezier curve for example the formula for the
curve can be transformed with the transform matrix
(something like the CTM) to screen coordinates. 
On this construction/formula the minima and maxima 
for x and y can be searched.