Color Format in the README about lua-fenster

[pauladam94]

Ok I figured it out.

local function rgb(r, g, b)
	return r * 256 * 256 + g * 256 + b
end

[jonasgeiler]

This library uses 24-bit colors. If you ever used hexadecimal colors in CSS or a graphics program like Photoshop, they work pretty similarly.
For example #ff0000 (Red) would look like 0xff0000 in Lua, which is just the number 16711680 in a nicer format.
So basically the colors go from 0x000000 (Black, 0) to 0xffffff (White, 16777215).
Just play around with the window:set() function and try different colors, I'm sure you'll figure it out.

For using RGB there is a utility called fenster.rgb() which you can use to convert from and to RGB:

-- RGB to 24-bit color
fenster.rgb(255, 0, 0) -- returns 0xff0000

-- 24-bit color to RGB
fenster.rgb(0xff0000) -- returns 255, 0, 0

[jonasgeiler]

Similar to #8 I will turn this into a discussion as well in case someone has a similar question in the future.