anchor: love.physics.newRopeJoint
  Creates a joint between two bodies. Its only function is enforcing a max distance between these bodies.
  joint = love.physics.newRopeJoint( body1, body2, x1, y1, x2, y2, maxLength, collideConnected )
  body1 Body The first body to attach to the joint.
  body2 Body The second body to attach to the joint.
  x1 number The x position of the first anchor point.
  y1 number The y position of the first anchor point.
  x2 number The x position of the second anchor point.
  y2 number The y position of the second anchor point.
  maxLength number The maximum distance for the bodies.
  collideConnected (false) boolean Specifies whether the two bodies should collide with each other.
  joint RopeJoint The new RopeJoint.