Class: Mittsu::Color

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Color

Returns a new instance of Color.



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# File 'lib/mittsu/math/color.rb', line 7

def initialize(*args)
  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 Attribute Details

#b ⇒ Object

Returns the value of attribute b.



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# File 'lib/mittsu/math/color.rb', line 5

def b
  @b
end

#g ⇒ Object

Returns the value of attribute g.



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# File 'lib/mittsu/math/color.rb', line 5

def g
  @g
end

#r ⇒ Object

Returns the value of attribute r.



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# File 'lib/mittsu/math/color.rb', line 5

def r
  @r
end

Instance Method Details

#add(color) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 176

def add(color)
  @r += color.r
  @g += color.g
  @b += color.b
  self
end

#add_colors(color1, color2) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 183

def add_colors(color1, color2)
  @r = color1.r + color2.r
  @g = color1.g + color2.g
  @b = color1.b + color2.b
  self
end

#add_scalar(s) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 190

def add_scalar(s)
  @r += s
  @g += s
  @b += s
  self
end

#clone ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 236

def clone
  Mittsu::Color.new(@r, @g, @b)
end

#convert_gamma_to_linear ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 113

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

#convert_linear_to_gamma ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 121

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

#copy(color) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 91

def copy(color)
  @r = color.r
  @g = color.g
  @b = color.b
  self
end

#copy_gamma_to_linear(color, gamma_factor = 2.0) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 98

def copy_gamma_to_linear(color, gamma_factor = 2.0)
  @r = color.r ** gamma_factor
  @g = color.g ** gamma_factor
  @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 105

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

#equals(c) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 218

def equals(c)
  (c.r == @r) && (c.g == @g) && (c.b == @b)
end

#from_array(array) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 222

def from_array(array)
  @r = array[0]
  @g = array[1]
  @b = array[2]
  self
end

#hex ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 128

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

#hex_string ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 132

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 136

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 = @r, @g, @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

#lerp(color, alpha) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 211

def lerp(color, alpha)
  @r += (color.r - @r) * alpha
  @g += (color.g - @g) * alpha
  @b += (color.b - @b) * alpha
  self
end

#multiply(color) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 197

def multiply(color)
  @r *= color.r
  @g *= color.g
  @b *= color.b
  self
end

#multiply_scalar(s) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 204

def multiply_scalar(s)
  @r *= s
  @g *= s
  @b *= s
  self
end

#offset_hsl(h, s, l) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 167

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 16

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

#set_hex(hex) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 30

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

#set_hsl(h, s, l) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 45

def set_hsl(h, s, l)
  # h,s,l ranges are in 0.0 - 1.0
  if s.zero?
    @r = @g = @b = l
  else
    p = l <= 0.5 ? l * (1.0 + s) : l + s - (l * s)
    q = (2.0 * l) - p
    @r = hue2rgb(q, p, h + 1.0 / 3.0)
    @g = hue2rgb(q, p, h)
    @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 38

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

#set_style(style) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 59

def set_style(style)
  # rgb(255,0,0)
  if /^rgb\((\d+), ?(\d+), ?(\d+)\)$/i =~ style
    @r = [255.0, $1.to_f].min / 255.0
    @g = [255.0, $2.to_f].min / 255.0
    @b = [255.0, $3.to_f].min / 255.0
    return self
  end
  # rgb(100%,0%,0%)
  if /^rgb\((\d+)\%, ?(\d+)\%, ?(\d+)\%\)$/i =~ style
    @r = [100.0, $1.to_f].min / 100.0
    @g = [100.0, $2.to_f].min / 100.0
    @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 163

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

#to_array(array = [], offset = 0) ⇒ Object 



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# File 'lib/mittsu/math/color.rb', line 229

def to_array(array = [], offset = 0)
  array[offset] = @r
  array[offset + 1] = @g
  array[offset + 2] = @b
  array
end