reactionForce method
Get the reaction force on body2 at the joint anchor in Newtons.
Implementation
@override
Vector2 reactionForce(double invDt) {
final temp = Vector2.zero();
temp
..setFrom(_ay)
..scale(_impulse);
final result = Vector2.copy(_ax)
..setFrom(_ax)
..scale(_springImpulse)
..add(temp)
..scale(invDt);
return result;
}