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- #!/usr/bin/ruby
- #
- ## https://rosettacode.org/wiki/Barnsley_fern
- #
- require('Imager')
- var w = 640
- var h = 640
- var img = %O<Imager>.new(xsize => w, ysize => h, channels => 3)
- var green = %O<Imager::Color>.new('#00FF00')
- var (x, y) = (float(0), float(0))
- for r in (^1e4 -> lazy.map { 100.irand }) {
- (x, y) = (
- if (r <= 1) { ( 0.00*x - 0.00*y, 0.00*x + 0.16*y + 0.00) }
- elsif (r <= 8) { ( 0.20*x - 0.26*y, 0.23*x + 0.22*y + 1.60) }
- elsif (r <= 15) { (-0.15*x + 0.28*y, 0.26*x + 0.24*y + 0.44) }
- else { ( 0.85*x + 0.04*y, -0.04*x + 0.85*y + 1.60) }
- )
- img.setpixel(x => w/2 + 60*x, y => 60*y, color => green)
- }
- img.flip(dir => 'v')
- img.write(file => 'barnsleyFern.png')
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