"node" - mkraska/meclib GitHub Wiki
[ "node", "name", [x,y], off, color ]
Node (small white circle, typically indicates hinge point) with label.
"name"
label text, typeset in MathJax math mode.[x,y]
center pointoff
(optional, default: 10 pixel) offset of label text anchor from center pointcolor
(optional, default: fillcolor white, labelcolor black) set the color for label and fill
Example
[
[ "grid", "x","y", -5,5,-4,5, 50, [10,10], [0,0] ],
[ "node", "name", [2,2] ],
[ "node", "S_2", [3,2], 1, "red"]
]