File:Learning-taxonomy-sfdp-3.1.svg

/*
Conole, Conele & Fill Learning and pedagogy taxonomy
Reloaded by Daniel K. Schneider, TECFA, University of Geneva, i.e. I put this together
from a variety of resources (papers, PPTs, Cloudworks, and DialogPlus + a bit of my own
http://edutechwiki.unige.ch/en/Conole_and_Fill_learning_taxonomy

ftp/sfdp layout models

Optimized for the following kinds of dot commands:
dot -s72 -Kfdp -Tsvg learning-taxonomy-fdp-2.map > learning-taxonomy-fdp-2.svg
dot -s72 -Ksfdp -Tsvg learning-taxonomy-fdp-2.map > learning-taxonomy-sfdp-3.svg
dot -s72 -Kfdp -Tdot learning-taxonomy-fdp-2.map > learning-taxonomy-fdp.dot
dot -Kneato -Tsvg learning-taxonomy-fdp-2.map > learning-taxonomy-neato-7.svg

Remarks:
* some attributes and even links (edges) needs to be ajusted for different layout models. E.g. sftp works best with a strictly hierarchical graph.
* some attributes are ignored, i.e. sfdp does not look at clusters or pos
* ''pos'' (positions) do not seem to work with sdfp 
* A neato model takes a long time to compute (15 minutes or more, others are fast)

*/ 

// -- start of the graph definition

digraph learning_taxonomy {

// -- -- graph attributes (all models)

// A0 landscape page size - should print fine as poster, either A0 or A1
// Size in inches of an A0 page is 48.8x33.1
// Size in points would be "3355,2383" points (1 inch = 72 points);

// A0 landscape
size="46.8,33.1";
// A0 portrait page size
// size="33.1,46.8";
// A0 square
// size="33.1,33.1";

// -- ratio is CRUCIAL (all models)
// either fill or expand will extend the graph to the size defined above, else you will get a thrown together mess. fill expands in two directions, expand stops when the first is filled.
ratio="fill";
// ratio="expand";

// -- -- fdp and sfdp
// uncomment for other models !!

// -- Smoothing - spreads, but may create large overlaps
// smoothing="spring";

// --- other global attributes to play with (some not working/useful)
// some are ignored or overridden by various models/attributes

// -- quadType
quadtree ="none";

// -- width/height ratio
// aspect=0.7;

// -- spring constant (see also smoothing)
// K=3;

// len=1;

// rankdir=LR;

// -- packMode (seems to have little or no influence
//    pts around a pack
// pack = 50;
// -- pack method
// packMode = "node";
// packMode = "clust";

// Splines (instead of straight lines)
// splines (takes a looonng time to compute, used with neato for example)
splines=true;

// -- -- SFDP specific
// repulsive force - to spread out nodes (between 2 and 5). 
// If high most whitespace will be filled, if low you'll get more packed clusters
repulsiveforce = 2;

// -- -- rather Neato model specific

// Mode is a layout optimization technique, mostly used with neato
mode = "ipsep";

// -- Removes overlap but stretches a lot, always also define scaling
//    stretches out the clusters quite a lot, see the trees but not the forrest
// See also repulsive force.
// for a neato model make it really big (e.g. 10)
overlap_scaling=1.5;

// Overlap -- determines if and how node overlaps should be removed.
// overlap=ipsep;
// used with neato,FDP  and SFDP
overlap="prism1000";

// --- node and edge params

// nodesep and fontsize have a big impact for dot, nodesp only works with dot
node [fontsize=14,fontname="Arial",shape=none,nodesep=2];
edge [arrowhead=normal,arrowsize=0.3]
// distance between head and tail label
// labeldistance = 5;