Spiral Turing test

Renders spirals plus text over them.

Methods
Public Instance methods
generate(img, word)

contract method - generate the challenge

    # File lib/turing/image_plugins/spiral.rb, line 17
17:         def generate(img, word) # {{{
18:                 fg = GD2::Color[185, 140, 140]
19:                 sfg = GD2::Color[225, 190, 190]
20: 
21:                 spiral(img, (img.width/3) + rand(img.width/3), rand(img.height), sfg)
22: 
23:                 write_string(img, 'cour.ttf', fg, word)
24: 
25:                 spiral(img, rand(img.width / 3), rand(img.height), sfg)
26:                 spiral(img, 2*(img.width/3) + rand(img.width/3), rand(img.height), sfg)
27:         end