On December 9, 2005 4:06 PM C Y wrote: > > --- Bill Page wrote: > > > I have just been waiting for the little extra time I would > > need to key in the GraphViz specification for the graphs in > > the endpaper.pamphlet file to see what kind of layout it will > > produce automatically. > > Drool... >
Here is an example of the Axiom "EndPaper" graphic produced by GraphViz: http://wiki.axiom-developer.org/SandBoxEndPaper You should also take a look at the actual coding of this page at http://wiki.axiom-developer.org/SandBoxEndPaper/editform You will see that it consists of only a list of the nodes and edges of the graph like this: {AbelianSemiGroup, SemiGroup, OrderedSet, Finite} -> SetCategory; AbelianMonoid -> AbelianSemiGroup; Rng -> {AbelianGroup, SemiGroup}; Monoid -> SemiGroup; OrderedAbelianSemiGroup -> {OrderedSet, AbelianMonoid}; ... GraphViz does all the work of laying out the graph in a reasonable form for the reader. The result is not so different from the actual graphic in the Axiom book. At the present time GraphViz on MathAction is rendered as postscript and processed by LaTeX as a figure. This allows GraphViz output to appear in pamphlet files. But I think that as a result of the rescaling done by LaTeX and the conversion to png, the quality of the image may not be as good as it could be. This also makes it impossible at present to include hyperlinks in the graph. There are probably a few more tweaks that I could make to the specification of the graph to improve the readability of the node labels. But it seems to me that this is about as large a graph as might be possible to display on a web page. GraphViz can also be used to produce a png file directly. This should produce a better quality image and would permit the use of an image map for clickable hyperlinks on nodes and edges. To do this will require another extension of MathAction to allow a new pseudo-enviroment something like this: \begin{graphviz} GraphViz commands including hyperlinks \end{graphviz} When clicking 'Save' this would be processed directly by GraphViz to a png graphic with an associated image map for display on the web page. I said earlier that I wanted to stop doing web application development and work more on Axiom, but if there is some interest in using GraphViz this way on MathAction, I would be willing to add this functionality. Regards, Bill Page. _______________________________________________ Axiom-developer mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/axiom-developer
