Class: CapeCod::Color

Inherits:
Object
  • Object
show all
Defined in:
lib/cape-cod/color.rb

Constant Summary collapse

CODES =

The ANSI color codes.

{
  black:    0,
  red:      1,
  green:    2,
  yellow:   3,
  blue:     4,
  magenta:  5,
  cyan:     6,
  white:    7,
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*color, ground) ⇒ Color

Initializes a the color.

color may be either a single Integer representation of a RGB color, a Symbol with the color name (valid color names are listed in the COLORS hash), or three integers representing the RGB channels. ground is either :background or :foreground.



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
 
# File 'lib/cape-cod/color.rb', line 38

def initialize(*color, ground)
  unless [:foreground, :background].include? ground
    raise ArgumentError, 'color must be either foreground or background.'
  end

  if color.empty? || color.size > 3 || color.size == 2
    raise ArgumentError,
                  "wrong number of arguments (#{color.size + 1} for 2|4)."
  elsif color.size == 3
    color = [(color[0] << 16) | (color[1] << 8) | color[2]]
  elsif color.first.is_a?(Integer) && color.first < 0
    raise ArgumentError, 'hex code must be positive.'
  elsif color.first.is_a?(Symbol) && !CODES.has_key?(color.first)
    raise ArgumentError, %(invalid color name "#{color.first}".)
  end

  @ground = ground
  @color  = color.first
end

Class Method Details

.hex_to_ansi(hex) ⇒ Object

Returns the ANSI domain code for the given RGB color packed into an Integer.



24
25
26
27
28
 
# File 'lib/cape-cod/color.rb', line 24

def self.hex_to_ansi(hex)
  (6 * ((hex >> 16 & 0xff) / 256.0)).to_i * 36 +
  (6 * ((hex >>  8 & 0xff) / 256.0)).to_i *  6 +
  (6 * ((hex       & 0xff) / 256.0)).to_i
end

Instance Method Details

#ansi_code ⇒ Object

Returns a string representing the ANSI escape code for this color.



61
62
63
64
65
66
 
# File 'lib/cape-cod/color.rb', line 61

def ansi_code
  case @color
  when Symbol  then code_from_name
  when Integer then code_from_hex
  end
end