anchor: Body:getWorldPoints
  Transforms multiple points from local coordinates to world coordinates.
  x1, y1, x2, y2 = Body:getWorldPoints( x1, y1, x2, y2 )
  x1 number The x position of the first point.
  y1 number The y position of the first point.
  x2 number The x position of the second point.
  y2 number The y position of the second point.
  x1 number The transformed x position of the first point.
  y1 number The transformed y position of the first point.
  x2 number The transformed x position of the second point.
  y2 number The transformed y position of the second point.