Module: PaletteCreator

Defined in:
lib/palette_creator.rb

Overview

Author

Sean McCarthy

Copyright

Copyright © 2012 Sean McCarthy

License

GPL3

Based on krazydad.com/tutorials/makecolors.php

Class Method Summary collapse

Class Method Details

.create(options = {}) ⇒ Object

Create a colour palette

options can have the following keys:

  • count: number of colours to generate

  • frequency: frequency of the sine wave

  • phases:



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/palette_creator.rb', line 16

def self.create(options={})
  opts = OpenStruct.new(options)
  count     = opts.count || 32
  frequency = opts.frequency || 0.3
  phases    = opts.phases || [0, 2, 4]
  amplitude = 127 # ~ 255/2
  center    = 128 # ~ 255/2

  palette = []
  count.times do |i|
    red   = Math.sin(frequency*i + phases[0]) * amplitude + center;
    green = Math.sin(frequency*i + phases[1]) * amplitude + center;
    blue  = Math.sin(frequency*i + phases[2]) * amplitude + center;
    palette << [red.to_i, green.to_i, blue.to_i]
  end
  palette
end

.rgb_as_hex(rgb_array) ⇒ Object 



34
35
36
 
# File 'lib/palette_creator.rb', line 34

def self.rgb_as_hex(rgb_array)
  rgb_array.map{|val| "%02x" % val}.join('').upcase
end