anchor: SpriteBatch:getColor
  Gets the color that will be used for the next add and set operations.
  
  If no color has been set with SpriteBatch:setColor or the current SpriteBatch color has been cleared, this method will return nil.
  
  In versions prior to 11.0, color component values were within the range of 0 to 255 instead of 0 to 1.
  r, g, b, a = SpriteBatch:getColor()
  r number The red component (0-1).
  g number The green component (0-1).
  b number The blue component (0-1).
  a number The alpha component (0-1).