INSTRUCTIONS.md

Instructions

@lindenmoji renders Lindenmayer systems. You may specify an L-system by specifying an initial condition, defining rules, and defining settings.

This is a valid L-system that draws a single line:

a; a=F

The initial condition is the rule a, which contains only the command F--the command to move the cursor forward and draw a line (which may also be invoked with ➡️ and →).

A more complex system looks like this:

aaaa; a=FO+; 📐=90

This defines an initial condition of aaaa ("do rule a four times") and defines a as "draw a line", "draw a circle", and "rotate by the rotation angle". 📐 is a setting that specifies the rotation angle, in this case 90 degrees. The output is a square with a circle drawn at each corner:

An even more complex system that draws a leaf looks like this:

F; F=F[++F[-F]]F[-FF[F]]; 📐=12; 〰️=0.8; 🍥=0.6

This system draws the Peano-Gosper curve, it's the first example to define more than one rule:

Fx; x=x+yF++yF-Fx--FxFx-yF+; y=-Fx+yFyF++yF+Fx--Fx-y; 📐=60

Commands

Symbol(s)	Description
➡️, →, F	Draw a line in the direction of the heading. Takes an optional length.
⤵️, M	Move the cursor in the direction of the heading. Takes an optional length.
↪️, ↪, -	Rotate the heading counter-clockwise by the rotation angle.
↩️, ↩, +	Rotate the heading clockwise by the rotation angle.
⬜️	Draw an empty square. Takes an optional size.
⬛️	Draw a filled square. Takes an optional size.
⭕️, O	Draw en empty circle. Takes an optional size.
🔴	Draw a filled circle. Takes an optional size.
📐	Rotate the heading by the specified positive or negative angle.
🎨	Set the line color. There are approximately 10 colors available.
[	Store the current state.
]	Restore the previous state.

Settings

Symbol	Description
📐	Set the global rotation angle.
🌇	Specify a gradient background. There are approximately 7 backgrounds available.
🍥	Set the variation in angle.
〰️	Set the variation in distance.
🎨	Set the default line color.
🌝	Set the default line opacity.
🌞	Set the default fill opacity.