"line" - mkraska/meclib GitHub Wiki
[ "line", "color", [x1, x2,...], [y1, y2,...] ,dash, th ]
polyline with optional dash style and thickness
"color"color of the line, string. If empty (""),"black"is used.[x1, x2,...], [y1, y2,...]lists of x and y values. Must have same length.dash(optional, defaults to"-") line style. possible values:"-", "--", ".", "-."(self explaining)th(optional, default: 0.8) thickness in pixel
Example

[
[ "grid", "x","y", -5,5,-4,5, 50 ],
[ "line", "", [1, 2,3,4], [1,2,2,1] ],
[ "line", "red", [2,3], [1,1],"--", 3 ]
]