Method weldJoint

src/main/java/trace/physics/PhysicsSystem.kt:197–207

        val w = world.createJoint(d)
        return w
    }

    fun weldJoint(a: FLine, b: FLine, dampingRatio: Double, frequencyHz: Double): Joint {
        val pa = addPhysics(a)
        val pb = addPhysics(b)

        val d = WeldJointDef()
        d.initialize(pa.body, pb.body, convert(field.linalg.Vec2(0.0, 0.0)));
        d.dampingRatio = dampingRatio.toFloat()
        d.frequencyHz = frequencyHz.toFloat()
        val w = world.createJoint(d)
        return w
    }