anchor: SpriteBatch:add
  Adds a sprite to the batch. Sprites are drawn in the order they are added.
  id = SpriteBatch:add( x, y, r, sx, sy, ox, oy, kx, ky )
  x number The position to draw the object (x-axis).
  y number The position to draw the object (y-axis).
  r (0) number Orientation (radians).
  sx (1) number Scale factor (x-axis).
  sy (sx) number Scale factor (y-axis).
  ox (0) number Origin offset (x-axis).
  oy (0) number Origin offset (y-axis).
  kx (0) number Shear factor (x-axis).
  ky (0) number Shear factor (y-axis).
  id number An identifier for the added sprite.
  id = SpriteBatch:add( quad, x, y, r, sx, sy, ox, oy, kx, ky )
  quad Quad The Quad to add.
  x number The position to draw the object (x-axis).
  y number The position to draw the object (y-axis).
  r (0) number Orientation (radians).
  sx (1) number Scale factor (x-axis).
  sy (sx) number Scale factor (y-axis).
  ox (0) number Origin offset (x-axis).
  oy (0) number Origin offset (y-axis).
  kx (0) number Shear factor (x-axis).
  ky (0) number Shear factor (y-axis).
  id number An identifier for the added sprite.