#l-system

A really easy (rainbow!) colour gradient is Red > Yellow > Green > Cyan > Blue > Purple > Red In Python (with the mode idea) it'd look something like:

Notice that the final `elif` statement sets the mode back to 0 so the process can repeat.

The issue with this idea is that extending it to more colours is really tedious (ask me how I know) and you don't get the best transitions. For example, a transition from black (#000000) to white (#ffffff) would happen in 256 steps (#000000 > #010101 > #020202 > ...) which just isn't gradual enough. A better transition would only change one of R, G, and B at a time (#000000 > #010000 > #010100 > ...). We can implement that with a counter (`f`) and a modulo (`%`)!

The updated version is:

(Don't look too hard; I wrote this while sleep deprived. )

Where `ln` and `l` is how many times longer than tall the drawn pixel should be `c` is just what character I'm on (the curve is constructed using an L-system) `dw` and `dh` are the actual width and height of a pixel `cR`, `cG`, and `cB` are how much the RGB values should change (0 or 1, unless you want an even more gradual or even more extreme transition) `x` and `y` are where to put the pixel `fx` and `fy` just set the next position (-1, 0, or 1) `f` is a counter `s` is how big a sample should be, that is, how many pixels we change per frame `loops` is how many times the entire image should be filled (1 loop will draw the image and then erase itself; 2 loops will draw the image, draw over itself again, and then erase itself) `o` is the order of the curve

The goal here is to pick a random colour from a list of colours (colours = [(25, 25, 25), (255, 255, 255), (255,0,0), (0,255,0), (0,0,255), (255,255,0), (255,0,255), (0,255,255), (255,127,127), (127,255,127), (127,127,255), (255,255,127), (255,127,255), (127,255,255)]) and then alternate (using `f%...`) which of `R`, `G`, and `B` you increment until you hit that colour.

Now let's have some fun!

colours = [(25, 25, 25), (255, 255, 255), (255,0,0), (255, 127, 127)] dw = 4 dh = 4 l = 1 s = 5 o = 5 loops = 2

colours = [(25, 25, 25), (255, 255, 255), (255,0,0), (255, 127, 127)] dw = 4 dh = 4 l = 2 s = 5 o = 5 loops = 2

colours = [(255, 0, 0), (0, 255, 0), (0, 0, 255)] dw = 4 dh = 3 l = 2 s = 5 o = 5 loops = 2

colours = [(255, 0, 0), (0, 255, 0), (0, 0, 255), (255, 255, 0), (255, 0, 255), (0, 255, 255)] dw = 4 dh = 3 l = 3 s = 5 o = 5 loops = 2

colours = [(25, 25, 25), (127, 127, 127), (255, 255, 255)] dw = 1 dh = 2 l = 2 s = 5 o = 6 loops = 2

colours = [(25, 25, 25), (127, 127, 127), (255, 255, 255), (0,0,255), (0,0,127)] dw = 1 dh = 1 l = 1 s = 140 o = 9 loops = 2

dw = 1 dh = 1 l = 1 s = 255 o = 9 loops = 1

This .gif has 450,537 different colours! A far cry from the 256 we typically see