Ruby: Playing with Colour

Had an idea for a new twitter background.

I wrote it in ruby, using the rmagick API wrapper for ImageMagick.

Pretty straight forward:

• make a big black background,


• create a lot of random coloured squares and write the colour on them while you're at it,


• write to jpeg file

Here's the code.

require 'rubygems'
require 'RMagick' 
include Magick

buffer = Magick::Image.new(1700,1040) { self.background_color = "#000000" }

x = 10
y = 10
tone = [ '0', '1', '2', '3', '4', '5', '6', '7', 
         '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ]

srand 1234
1118.times do
  puts '* '+x.to_s+' '+y.to_s
  red = rand(16)
  green = rand(16)
  blue = rand(16)
  ligthness = red+green+blue
  co = '#'+tone[red]+tone[green]+tone[blue]
  patchObj = Magick::Draw.new
  patchObj.fill = co
  patchObj.polygon(x,y,x,y+30,x+30,y+30,x+30,y)
  patchObj.matte(3,3,PaintMethod::ReplaceMethod)
  patchObj.draw(buffer)
  textObj = Magick::Draw.new
  textObj.font = './fonts/Ghoul.ttf'
  textObj.pointsize=12
  if ligthness > 25 || green > 11 
    textObj.fill = '#000'
  else
    textObj.fill = '#fff'
  end
  textObj.text(x, y+12, co)
  textObj.draw(buffer)
  x = x+40
  if x > 1690
    x = 10
    y = y+40
  end
end 

buffer.display
buffer.write("random_colour.jpg")

exit

Enjoy.

#ToDo: use a resource pool so don't have the cost of creating over 2K Draw objects.