module Chroma::Color::Attributes
Attribute methods for {Color}.
Attributes
format[R]
Public Instance Methods
alpha()
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Returns the alpha channel value.
@example
'red'.paint.alpha #=> 1.0 'rgba(0, 0, 0, 0.5)'.paint.alpha #=> 0.5
@return [Float]
# File lib/chroma/color/attributes.rb, line 36 def alpha @rgb.a end
brightness()
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Calculates the brightness.
@example
'red'.paint.brightness #=> 76.245 'yellow'.paint.brightness #=> 225.93
@return [Float]
# File lib/chroma/color/attributes.rb, line 47 def brightness (@rgb.r * 299 + @rgb.g * 587 + @rgb.b * 114) / 1000.0 end
dark?()
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Determines if the color is dark.
@example
'red'.paint.dark? #=> true 'yellow'.paint.dark? #=> false
@return [true, false]
# File lib/chroma/color/attributes.rb, line 14 def dark? brightness < 128 end
light?()
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Determines if the color is light.
@example
'red'.paint.light? #=> false 'yellow'.paint.light? #=> true
@return [true, false]
# File lib/chroma/color/attributes.rb, line 25 def light? !dark? end
Private Instance Methods
rounded_alpha()
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# File lib/chroma/color/attributes.rb, line 53 def rounded_alpha @rounded_alpha ||= (alpha * 100).round / 100.0 end