new Box2dRopeJoint(objectA, objectB, anchorA, anchorB, extraLength, collide)box2d.js:1564Create a rope joint
objectABox2dObjectobjectBBox2dObjectanchorAVector2 optionalWorld position, objectA's position if not given
anchorBVector2 optionalWorld position, objectB's position if not given
extraLengthnumber optional, default 0collideboolean optional, default false