Class: RGB

Inherits:
Object
  • Object
show all
Includes:
Colour
Defined in:
lib/rgb.rb

Overview

A representation of a colour in the RGB colour space

Stores the numbers internally as floats between 0 and 1

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Colour

#analogous, #complementary, #gradient_to, #rotate_hue, #split_complementary, #to_rgb, #to_s, #triadic

Constructor Details

#initialize(r = 0.0, g = 0.0, b = 0.0) ⇒ RGB

Returns a new instance of RGB.



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# File 'lib/rgb.rb', line 8

def initialize(r=0.0, g=0.0, b=0.0)
	@r = r.abs.to_f
	@g = g.abs.to_f
	@b = b.abs.to_f
end

Instance Attribute Details

#b ⇒ Object

Returns the value of attribute b.



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# File 'lib/rgb.rb', line 5

def b
  @b
end

#g ⇒ Object

Returns the value of attribute g.



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# File 'lib/rgb.rb', line 5

def g
  @g
end

#r ⇒ Object

Returns the value of attribute r.



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# File 'lib/rgb.rb', line 5

def r
  @r
end

Instance Method Details

#hex ⇒ Object 



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# File 'lib/rgb.rb', line 41

def hex
 eval(sprintf("0x%02X%02X%02X", r*255, g*255, b*255))
end

#to_hsv ⇒ Object 



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# File 'lib/rgb.rb', line 14

def to_hsv
	min = [@r, @g, @b].min
	max = [@r, @g, @b].max
	delta = max - min
	
	if(max == 0) then
		s = 0 #Techically if s = 0, then v is undefined
	else
		s = delta / max
	end
	if(@r == max) then #Yellow and Magenta
		h = (@g - @b) / delta             
	elsif (g == max) then #Cyan and Yellow
		h = 2 + (@b - @r) / delta 
	else #Magenta and Cyan
		h = 4 + (@r - @g) / delta
	end
  
	h *= 60
  
	HSV.new((h + 360) % 360,s,max)
end

#web_hex ⇒ Object 



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# File 'lib/rgb.rb', line 37

def web_hex
	sprintf("#%02X%02X%02X", r*255, g*255, b*255)
end

#web_safe(depth = 1) ⇒ Object 



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# File 'lib/rgb.rb', line 45

def web_safe(depth=1)
	"#" + 
	sprintf("%X", r*15) * depth +
	sprintf("%X", g*15) * depth +
	sprintf("%X", b*15) * depth
end