anchor: love.physics.newChainShape
  Creates a new ChainShape.
  shape = love.physics.newChainShape( loop, x1, y1, x2, y2, ... )
  loop boolean If the chain should loop back to the first point.
  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.
  ... number Additional point positions.
  shape ChainShape The new shape.
  shape = love.physics.newChainShape( loop, points )
  loop boolean If the chain should loop back to the first point.
  points table A list of points to construct the ChainShape, in the form of {x1, y1, x2, y2, ...}.
  shape ChainShape The new shape.