On Mon, Jun 15, 2009 at 12:19:49PM -0700, Rob Beezer wrote:
>
> On Jun 15, 3:03 am, William Stein <[email protected]> wrote:
> > Just out of curiosity what computes the layout of the graph? Does
> > Sage give the vertex positions, then tikz takes care of the *text
> > labels* and edge positions? Or can tikz actually plot a layout?
>
> The tkz-graph package is really more about presentation ("looks") than
> about computation. It will do simple things like circular and grid
> layouts, paths on lines at 45-degree angles, etc. It will easily
> "bend" edges, which is useful for digraphs when there is an edge going
> both ways between two vertices. But on the whole, I think matters
> regarding layouts are best handled within Sage itself, and then just
> scaled linearly to fit bounding boxes, etc.
>
> The strengths of tkz-graph are the placements and styles of labels on
> vertices and edges, and the styles of the vertices and edges
> themselves. For example, edges can be of one color with thin black
> borders, and at crossings there is an obvious "under and over"
> appearance which helps the eye track an edge in a messy looking
> graph. Edge labels can appear in the middle of an edge (suitably
> rotated to align with the edge), included inside a rectangle with a
> colored border, with Latex math objects for contents, typeset
> properly.
>
> And finally, as Latex code they can be employed by all the support
> Sage has for Latex, and they can be employed in other documents
> without the whole business of including image files produced by some
> other mechanism.
Including fine tuning a posteriori the layout, inserting by hand some
extra features, adding some \uncover<3->{...} for inclusion in beamer
presentations, etc; all of which we use a lot!
For info: I'll try to give it a shot at making an optional dot2tex
spkg before FPSAC and integrating this with your graph -> latex export
(to handle the layout).
Best,
Nicolas
--
Nicolas M. Thiéry "Isil" <[email protected]>
http://Nicolas.Thiery.name/
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