Linx is a simple programming language that allow you create drawings on a canvas. The language is pretty minimal, without flow controls or statements, the only thing you can use is variables.
You can declare a variable using the defvar command
Usage : defvar <type> <name> <value> ...
;; this program defines a var and set the foreground color to the values of the var
defvar color testColor 255 255 255 255
setfg $testColor