Physics spring joint type.

@:optionaloptionallength:Null<Float>

The natural length between the anchor points.

@:optionaloptionalfrequency:Null<Float>

The mass-spring-damper frequency in Hertz. A value of 0 disables softness.

@:optionaloptionaldamping:Null<Float>

The damping ratio. 0 = no damping, 1 = critical damping.

@:optionaloptionalcollide_connected:Null<Bool>

Set this flag to true if the attached bodies should collide.