[Lib2geom-devel] lib2geom basics: define pathvector, define ellipse, define intersection

[mathog <ma...@ca...>]

Is there any documentation for lib2geom?  I hunted all over and could 
only find the source code, but not a scrap of other documentation or a 
complete example program.  The only examples so far are in Inkscape, 
which isn't so good for the purpose of learning what lib2geom does.  (I 
did find in inkscape examples of how to copy a path with multiple 
segments, just not how to create one!)

So I'm asking here for some help.  Hope that is appropriate for this 
mailing list.

I need to do the following using lib2geom (I think) within inkscape.  
Starting with pathA (a Geom::PathVector
passed in from the caller, which in general is drawn both filled and 
stroked):

1.  generate a second PathVector "pathB".  In one case this is a 
rectangle (with corners known), and in the the other it is an elliptical 
ring (center, inner/outer radii, minor, major unit axis vectors all 
known).

2.  generate a third PathVector "pathC" = INTERSECTION(pathA,pathB).  
Just like the Intersection option on the Paths menu.

3.  delete pathB and pathC.
Presumably something like:
    delete pathB;
    delete [] pathB;

If lib2geom does what I think it does then this should be 
straightforward and just be a couple of lines of code.  For which I have 
absolutely no idea what the syntax might be.

Thank you,

David Mathog
ma...@ca...
Manager, Sequence Analysis Facility, Biology Division, Caltech