anchor: love.physics.newDistanceJoint
  Creates a DistanceJoint between two bodies.
  
  This joint constrains the distance between two points on two bodies to be constant. These two points are specified in world coordinates and the two bodies are assumed to be in place when this joint is created. The first anchor point is connected to the first body and the second to the second body, and the points define the length of the distance joint.
  joint = love.physics.newDistanceJoint( body1, body2, x1, y1, x2, y2, 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 (world space).
  y1 number The y position of the first anchor point (world space).
  x2 number The x position of the second anchor point (world space).
  y2 number The y position of the second anchor point (world space).
  collideConnected (false) boolean Specifies whether the two bodies should collide with each other.
  joint DistanceJoint The new distance joint.