Class: Mittsu::Color

Inherits:
Vector3 show all
Defined in:
lib/mittsu/math/color.rb

Constant Summary collapse

ELEMENTS = 
{ r: 0, g: 1, b: 2 }
DIMENSIONS = 
ELEMENTS.count

Instance Attribute Summary

Attributes inherited from Vector

#elements, #index, #uv

Instance Method Summary collapse

Methods inherited from Vector3

#apply_axis_angle, #apply_euler, #apply_matrix3, #apply_matrix4, #apply_projection, #apply_quaternion, #cross, #cross_vectors, #distance_to_squared, #dot, #from_attribute, #length_manhattan, #project, #set_from_matrix_column, #set_from_matrix_position, #set_from_matrix_scale, #transform_direction, #unproject, #x, #x=, #y, #y=, #z, #z=

Methods inherited from Vector

#==, #[], #[]=, #add, #add_scalar, #add_vectors, #angle_to, #ceil, #clamp, #clamp_scalar, #clone, #copy, #distance_to, #divide, #divide_scalar, #each_dimension, #floor, #from_array, #length, #length_sq, #lerp, #lerp_vectors, #max, #min, #multiply, #multiply_scalar, #multiply_vectors, #negate, #normalize, #project_on_plane, #project_on_vector, #reflect, #round, #round_to_zero, #set_length, #sub, #sub_scalar, #sub_vectors, #to_array, #to_s

Constructor Details

#initialize(*args) ⇒ Color

Returns a new instance of Color.



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# File 'lib/mittsu/math/color.rb', line 8

def initialize(*args)
  super(0, 0, 0)
  case args.length
  when 3 then self.set_rgb(*args)
  when 1 then self.set(args.first)
  when 0 then self.set_rgb(1.0, 1.0, 1.0)
  else raise ArgumentError, "Arguments must be (r, g, b), (color), or none"
  end
end

Instance Method Details

#convert_gamma_to_linear ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 114

def convert_gamma_to_linear
  rr, gg, bb = self.r, self.g, self.b
  self.r = rr * rr
  self.g = gg * gg
  self.b = bb * bb
  self
end

#convert_linear_to_gamma ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 122

def convert_linear_to_gamma
  self.r = ::Math.sqrt(self.r)
  self.g = ::Math.sqrt(self.g)
  self.b = ::Math.sqrt(self.b)
  self
end

#copy_gamma_to_linear(color, gamma_factor = 2.0) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 99

def copy_gamma_to_linear(color, gamma_factor = 2.0)
  self.r = color.r ** gamma_factor
  self.g = color.g ** gamma_factor
  self.b = color.b ** gamma_factor
  self
end

#copy_linear_to_gamma(color, gamma_factor = 2.0) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 106

def copy_linear_to_gamma(color, gamma_factor = 2.0)
  safe_inverse = (gamma_factor > 0) ? (1.0 / gamma_factor) : 1.0
  self.r = color.r ** safe_inverse
  self.g = color.g ** safe_inverse
  self.b = color.b ** safe_inverse
  self
end

#hex ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 129

def hex
  (self.r * 255).to_i << 16 ^ (self.g * 255).to_i << 8 ^ (self.b * 255).to_i << 0
end

#hex_string ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 133

def hex_string
  ('000000' + self.hex.to_s(16))[-6..-1]
end

#hsl(target = nil) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 137

def hsl(target = nil)
  # h,s,l ranges are in 0.0 - 1.0
  hsl = target || { h: 0.0, s: 0.0, l: 0.0 }
  rr, gg, bb = self.r, self.g, self.b
  max = [r, g, b].max
  min = [r, g, b].min
  hue, saturation = nil, nil
  lightness = (min + max) / 2.0
  if min == max
    hue = 0.0
    saturation = 0.0
  else
    delta = max - min
    saturation = lightness <= 0.5 ? delta / (max + min) : delta / (2.0 - max - min)
    case max
    when rr then hue = (gg - bb) / delta + (gg < bb ? 6.0 : 0.0)
    when gg then hue = (bb - rr) / delta + 2.0
    when bb then hue = (rr - gg) / delta + 4.0
    end
    hue /= 6.0
  end
  hsl[:h] = hue
  hsl[:s] = saturation
  hsl[:l] = lightness
  hsl
end

#offset_hsl(h, s, l) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 168

def offset_hsl(h, s, l)
  hsl = self.hsl
  hsl[:h] += h
  hsl[:s] += s
  hsl[:l] += l
  self.set_hsl(hsl[:h], hsl[:s], hsl[:l])
  self
end

#set(value) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 26

def set(value)
  case value
  when Color
    self.copy(value)
  when Integer
    self.set_hex(value)
  when String
    self.set_style(value)
  else
    raise ArgumentError, "Arguments must be Color, Integer or String"
  end
  self
end

#set_hex(hex) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 40

def set_hex(hex)
  hex = hex.floor
  self.r = (hex >> 16 & 255) / 255.0
  self.g = (hex >> 8 & 255) / 255.0
  self.b = (hex & 255) / 255.0
  self
end

#set_hsl(h, s, l) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 53

def set_hsl(h, s, l)
  # h,s,l ranges are in 0.0 - 1.0
  if s.zero?
    self.r = self.g = self.b = l
  else
    p = l <= 0.5 ? l * (1.0 + s) : l + s - (l * s)
    q = (2.0 * l) - p
    self.r = hue2rgb(q, p, h + 1.0 / 3.0)
    self.g = hue2rgb(q, p, h)
    self.b = hue2rgb(q, p, h - 1.0 / 3.0)
  end
  self
end

#set_rgb(r, g, b) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 48

def set_rgb(r, g, b)
  @elements = [r.to_f, g.to_f, b.to_f]
  self
end

#set_style(style) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 67

def set_style(style)
  # rgb(255,0,0)
  if /^rgb\((\d+), ?(\d+), ?(\d+)\)$/i =~ style
    self.r = [255.0, $1.to_f].min / 255.0
    self.g = [255.0, $2.to_f].min / 255.0
    self.b = [255.0, $3.to_f].min / 255.0
    return self
  end
  # rgb(100%,0%,0%)
  if /^rgb\((\d+)\%, ?(\d+)\%, ?(\d+)\%\)$/i =~ style
    self.r = [100.0, $1.to_f].min / 100.0
    self.g = [100.0, $2.to_f].min / 100.0
    self.b = [100.0, $3.to_f].min / 100.0
    return self
  end
  # #ff0000
  if /^\#([0-9a-f]{6})$/i =~ style
    self.set_hex($1.hex)
    return self
  end
  # #f00
  if /^\#([0-9a-f])([0-9a-f])([0-9a-f])$/i =~ style
    self.set_hex(($1 + $1 + $2 + $2 + $3 + $3).hex)
    return self
  end
  # red
  if /^(\w+)$/i =~ style
    self.set_hex(Mittsu::ColorKeywords[style])
    return self
  end
end

#style ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 164

def style
  "rgb(#{ (self.r * 255).to_i },#{ (self.g * 255).to_i },#{ (self.b * 255).to_i })"
end