Those bindings do not already exist, as far as I know, but I think they'd make fine additions to either `dc-path%' or `dc%'.
The implementation of `region%' uses `cairo_clip_extents', so if you'd like to try the change (it will be a while before I could get to it), that might be useful code to look at. At Mon, 5 Aug 2013 18:37:33 +0200, Jens Axel Søgaard wrote: > Hi All, > > The dc-path% method get-bounding-box computes the bounding box not only for > the points on the path, but also for the control points defining the path. > This implies > that a bounding box can be much larger than the actual path. > > Cairo supports computation of tighter bounding boxes. Some take the > pen in consideration and some do not: > > cairo-path-extents cairo-stroke-extents cairo-fill-extents > > Am I so lucky that there already exists bindings to these? > > /Jens Axel > > Links to Cairo documentation: > > > http://www.cairographics.org/manual/cairo-Paths.html#cairo-path-extents > Computes a bounding box in user-space coordinates covering the points on > the current path. If the current path is empty, returns an empty rectangle > ((0,0), (0,0)). Stroke parameters, fill rule, surface dimensions and > clipping are not taken into account. > > http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-stroke-extents > Computes a bounding box in user coordinates covering the area that would be > affected, (the "inked" area), by a > cairo_stroke()<http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-stro > ke> > operation > given the current path and stroke parameters. > > http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-fill-extents > Computes a bounding box in user coordinates covering the area that would be > affected, (the "inked" area), by a > cairo_fill()<http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-fill> > operation > given the current path and fill parameters. > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
