chaos_game.sf

#!/usr/bin/ruby

#
## https://rosettacode.org/wiki/Chaos_game
#

require('Imager')

var width  = 600
var height = 600

var points = [
    [width//2,        0],
    [       0, height-1],
    [height-1, height-1],
]

var img = %O<Imager>.new(
                      xsize => width,
                      ysize => height,
                     )

var color = %O<Imager::Color>.new('#ff0000')
var r = [width.irand, height.irand]

30000.times {
    var p = points.rand

    r[] = (
        (p[0] + r[0]) // 2,
        (p[1] + r[1]) // 2,
    )

    img.setpixel(
        x     => r[0],
        y     => r[1],
        color => color,
    )
}

img.write(file => 'chaos_game.png')