Class: WDD::Utils::RGBColor

Inherits:
Object show all
Defined in:
lib/wdd-ruby-ext/utils/rgb_color.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ RGBColor

Returns a new instance of RGBColor.



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 13

def initialize( *args )
  if args.length == 0
    raise "Must supply initializer arguments"
  elsif args.length ==1
    raise "Single argument must be a string" if !args[0].is_a?( String )
    hex_color_string = args[0]

    if matches = hex_color_string.match( /#?([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})/ )
      @red = ("%02d" % "0x#{matches[1]}").to_i
      @green = ("%02d" % "0x#{matches[2]}").to_i
      @blue = ("%02d" % "0x#{matches[3]}").to_i
    elsif  matches = hex_color_string.match( /#?([0-9a-fA-F]{1})([0-9a-fA-F]{1})([0-9a-fA-F]{1})/ )
      @red = ("%02d" % "0x#{matches[1]}#{matches[1]}").to_i
      @green = ("%02d" % "0x#{matches[2]}#{matches[2]}").to_i
      @blue = ("%02d" % "0x#{matches[3]}#{matches[3]}").to_i
    else
      raise "Invalid RGB hex color code #{hex_color_string}" if !matches
    end
  elsif args.length == 3
    args.each do |arg|
      arg = arg.to_i
      raise "Invalid color value #{arg}" if !arg.is_a?( Fixnum ) || arg<0 || arg > 255
    end
    @red = args[0]
    @green = args[1]
    @blue = args[2]
  end
end

Instance Attribute Details

#blue ⇒ Object

Returns the value of attribute blue.



11
12
13
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 11

def blue
  @blue
end

#green ⇒ Object

Returns the value of attribute green.



10
11
12
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 10

def green
  @green
end

#red ⇒ Object

Returns the value of attribute red.



9
10
11
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 9

def red
  @red
end

Class Method Details

.color_cycle(start, arc_step_in_degrees, iterations, desaturation = 0, darken = 0) ⇒ Object 



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 112

def self.color_cycle start, arc_step_in_degrees, iterations, desaturation=0, darken=0
  angle = 0
  two_thirds_PI = 2.0 * Math::PI / 3
  four_thirds_PI = 4.0 * Math::PI / 3
  half_PI = Math::PI / 2
  colors = []
  iterations.times do |i|
    angle = ((start + i*arc_step_in_degrees) * Math::PI * 2) / 360
    red = (Math.cos(angle) + 1) / 2 * 255
    green = (Math.cos(angle + two_thirds_PI) + 1) / 2 * 255
    blue = (Math.cos(angle + four_thirds_PI) +1) / 2 * 255
    desat = (Math.cos(i)+1) / 2 * 60
    dark = (Math.cos(i*2)+1) / 2 * 20
    color = RGBColor.new(red, green, blue).saturate(desat).darken(dark).desaturate(desaturation).darken(darken)
    colors << color
    yield color if block_given?
  end
  colors
end

Instance Method Details

#darken(percentage) ⇒ Object

Darkens the color by percentage



61
62
63
64
65
66
67
68
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 61

def darken percentage
  raise "Invalid multiplier #{multiplier}.  Should be >= 0 and <= 100." if percentage < 0 || percentage > 100
  multiplier = percentage.to_f / 100
  new_red = (@red-multiplier*@red).min(255).to_i
  new_green = (@green-multiplier*@green).min(255).to_i
  new_blue = (@blue-multiplier*@blue).min(255).to_i
  return RGBColor.new( new_red, new_green, new_blue )
end

#desaturate(percentage) ⇒ Object 



97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 97

def desaturate percentage
  multiplier = (100.0 - percentage.to_f) / 100
  most_val = @red.max(@green).max(@blue)
  least_val = @red.min(@green).min(@blue)
  range = most_val
  red_ratio = 1.0 - @red.to_f / most_val
  green_ratio = 1.0 - @green.to_f / most_val
  blue_ratio = 1.0 - @blue.to_f / most_val
  highest_ratio = red_ratio.max(green_ratio).max(blue_ratio)
  new_red = most_val - red_ratio * range * multiplier
  new_green = most_val - green_ratio * range * multiplier
  new_blue = most_val - blue_ratio * range * multiplier
  return RGBColor.new( new_red.to_i, new_green.to_i, new_blue.to_i )
end

#lighten(percentage) ⇒ Object

Lightens the color by percentage



51
52
53
54
55
56
57
58
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 51

def lighten percentage
  raise "Invalid percentage #{percentage}.  Should be >= 0 and <= 100." if percentage < 0 || percentage > 100
  multiplier = percentage.to_f / 100
  new_red = (@red+(multiplier*(255-@red))).min(255).to_i
  new_green = (@green+(multiplier*(255-@green))).min(255).to_i
  new_blue = (@blue+(multiplier*(255-@blue))).min(255).to_i
  return RGBColor.new( new_red, new_green, new_blue )
end

#saturate(percentage) ⇒ Object 



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 76

def saturate percentage
  min_val = 0
  multiplier = percentage.to_f / 100
  most_val = @red.max(@green).max(@blue)
  return self.dup if most_val <= min_val
  least_val = @red.min(@green).min(@blue)
  red_ratio = 1.0 - @red.to_f / most_val
  green_ratio = 1.0 - @green.to_f / most_val
  blue_ratio = 1.0 - @blue.to_f / most_val
  new_red = @red - red_ratio * (@red - min_val) * multiplier
  new_green = @green - green_ratio * (@green - min_val) * multiplier
  new_blue = @blue - blue_ratio * (@blue - min_val) * multiplier
  # puts "@red: #{@red}"
  # puts "@green: #{@green}"
  # puts "@blue: #{@blue}"
  # puts "new_red: #{new_red}"
  # puts "new_green: #{new_green}"
  # puts "new_blue: #{new_blue}"
  return RGBColor.new( new_red.to_i, new_green.to_i, new_blue.to_i )
end

#saturation ⇒ Object 



70
71
72
73
74
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 70

def saturation
  least_val = @red.min(@green).min(@blue)
  most_val = @red.max(@green).max(@blue)
  saturation_level = (most_val - least_val).to_f / most_val * 100
end

#to_hex ⇒ Object 



42
43
44
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 42

def to_hex
  ("%02x" % @red) + ("%02x" % @green) + ("%02x" % @blue)
end

#to_hex! ⇒ Object 



46
47
48
 
# File 'lib/wdd-ruby-ext/utils/rgb_color.rb', line 46

def to_hex!
  '#' + to_hex
end