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Visify is an assembly-like esolang by User:PythonshellDebugwindow that can be used to draw graphics.


Visify code is made up of newline-separated commands grouped into blocks by headers. Code under a specific header executes at certain times. Headers start with an = equals sign, and commands use the syntax name arg1 arg2.


Header Called
=setup At the start of the program
=click When the mouse is clicked
=update Every tick


arg1 denotes the first argument, and arg2 denotes the second one.

Command Meaning
f Fill the pixel at (X,Y) = (arg1,arg2) (set it to black)
f Empty the pixel at (X,Y) = (arg1,arg2) (set it to white)
ve Set the variable arg1 to arg2
jf If arg1 doesn't evaluate to 0, then jump to the 1-indexed arg2th line


Command arguments can take any of the following forms:

  • Integer: a base-10 integer
  • Variable: the first character is a $ dollars sign, and the rest of the argument is the variable to get (set with ve)
    • Special variable: if the variable to get is x, return the mouse X, and if the variable to get is y return the mouse Y
  • Negation: the first character is a ! exclamation mark, and the rest of the argument is parsed as usual and then negated (e.g., set to 1 if equal to 0 else set to 0)
  • Addition: the argument is split around the + plus sign, and all the split sections are parsed as usual and then added together


Comments last until end-of-line and are denoted by #, e.g. f $x $y #Fill the pixel under the mouse



Instead of waiting for input from the keyboard, this Truth-machine waits for the mouse to be clicked and uses its X position as input, drawing an infinite line across the screen buffer if the X position is nonzero.

ve cx 0
jf !$x 7
f $cx 0
ve cx $cx+1

Basic painter

Whenever the mouse is clicked, the pixel at the mouse's position gets filled in (but not erased after).

f $x $y

Computational class

Visify is able to simulate a Minsky machine, as variables can be incremented and decremented and jumps are conditional.

External resources