a background generator

gistfile1.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'RMagick'

Width = 960.0

TotalDivisions = 24
Divisions = [ 4 + 1, 16 - 1, 4 ]
Colors =  [ '#6c7174', '#c3c7cb', '#4b4d4e' ]
BorderThickness = 8
BorderColor = '#000000'
BlueprintGridWidth = (Width + BorderThickness) / TotalDivisions - BorderThickness
Lengths = Divisions.map { |d| BlueprintGridWidth * d + (BorderThickness * (d - 1)) }

exit "TotalDivisions != Divisions total" if Divisions.inject(0) { |r,x| x += r } != TotalDivisions

canvas = Magick::Image.new(Width, 1)
gc = Magick::Draw.new
gc.stroke_width(1)

Lengths.zip(Colors).inject(0) do |last, (len,color)|
  puts "drawing from #{last}, length=#{len}, color=#{color}"
  gc.stroke(color)
  gc.line(last, 0, last + len, 0)
  gc.stroke(BorderColor)
  gc.line(last + len, 0, last + len + BorderThickness, 0)
  last + len + BorderThickness
end

gc.draw(canvas)
canvas.write(File.join(ARGV[0], 'bg.png'))