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the original code is from https://toytheater.com/geoboard/ I'm coming for protractor next...
KeyDescription
cChange current color
bChange background color to current color
xChange dots color to current color
 
nNew line start dot
vDraw line from start to current dot in current color
mUse for multiple connecting lines.
Shortcut for pressing v, then n on the same dot
 
uUndo last line as far back as you want
sSave current pattern