Hi,
Tiddlymap has a "raster" feature: https://www.youtube.com/watch?v=gT-3rfrwNgE
Apart from this, you can also change the edge style to "curved" edges or another style if desired
Hope this helps.
P.S. the Université de Genève uses a background image on the canvas and uses tiddlymap to link to tiddlers.
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http://atlas-disciplines.unige.ch/ is certainly an impressive tiddlywiki. We should drop them a line to see if they are willing to share tips and tricks.. Not least how to password protect the edit settings!
I would like to know this to.. tiddlymap is powerful, but also hard to make structured. I would wish that there was a way to auto align nodes.I don know how to do it with tiddlymap but, you could use tidgraph. If you have a tree hierarchy it produce very nice tree mind maps and is lightweight (but still configurable). but it can't handle many to many relations like tiddlymap.
So I used a quite powerful desktop software called VYM (https://sourceforge.net/projects/vym/) to create my disciplinary maps, and I exported them as png background images for tiddlymap. Then, I superimposed separate nodes that can be hovered for the definitions. Additionally, I created two invisible transparent empty nodes at the corners of each maps for the purpose of centering the view. I know it is kind of a makeshift job, but it looks the way I wanted. Of course, it would be great if tiddlymap could auto-align nodes, but I do not think is it possible at the moment, at least in the version I used.