ColorGradient.rb

class ColorGradient
 # initialize with three arrays of r,g,b values
 def initialize(c1, c2, c3)
 @c1 = c1
 @c2 = c2
 @c3 = c3
 end
 # ratio is fraction between 0 and 1
 def getColor(ratio)
 if (ratio < 0.5)
 ratio *= 2
 red = (@c1[0] * (1 - ratio) + @c2[0] * ratio).round
 green = (@c1[1] * (1 - ratio) + @c2[1] * ratio).round
 blue = (@c1[2] * (1 - ratio) + @c2[2] * ratio).round
 else
 ratio = (ratio - 0.5)*2
 red = (@c2[0] * (1 - ratio) + @c3[0] * ratio).round
 green = (@c2[1] * (1 - ratio) + @c3[1] * ratio).round
 blue = (@c2[2] * (1 - ratio) + @c3[2] * ratio).round
 end
 return [red, green, blue]
 end
end