Is there any current data visualization or 2-d plot package for smalltalk (squeak or pharo) platform?
something similar to d3js or processing.org, or maybe sdl support to draw lines/dots on the screen?
Have a look at roassal. While it is not exactly similar to d3js or procressing.org it is an interactive visualization engine with a nice DSL called Mondrian to script visualizations.
For further information look at:
Graph-ET might be what you are looking for: http://www.youtube.com/watch?v=PkKNALQHa88
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