public Node CreateWheel(Sprite2D sprite, Vector2 relativePosition, float radius, int suspensionFrequency, float suspensionDamping,
ParticleEffect2D particles, float distanceToEmitParticles)
{
Node wheelNode = Racer2D.CreateSpriteNode(sprite);
wheelNode.SetPosition2D(relativePosition);
// CreateSpriteNode adds a RigidBody for us, so we get it here
RigidBody2D wheelRigidBody = wheelNode.GetComponent <RigidBody2D>();
// We activate CCD
wheelRigidBody.SetBullet(true);
Racer2D.AddCollider <CollisionCircle2D>(wheelNode).SetRadius(radius);
// The Box2D wheel joint provides spring for simulating suspension
ConstraintWheel2D wheelJoint = Node.CreateComponent <ConstraintWheel2D>();
wheelJoint.SetOtherBody(wheelRigidBody);
wheelJoint.SetAnchor(relativePosition);
wheelJoint.SetAxis(Vector2.UnitY);
wheelJoint.SetFrequencyHz(suspensionFrequency);
wheelJoint.SetDampingRatio(suspensionDamping);
// Each wheel has a particle emitter to emit particles when it's in contact with the surface
Node particlesNode = Node.Scene.CreateChild();
particlesNode.SetPosition(new Vector3(relativePosition.X, relativePosition.Y, 14));
ParticleEmitter2D particleEmitter = particlesNode.CreateComponent <ParticleEmitter2D>();
particleEmitter.SetEffect(particles);
// We create a new Wheel struct and add to the _wheels list
_wheels.Add(new Wheel(wheelRigidBody, wheelJoint, particleEmitter, distanceToEmitParticles));
return(wheelNode);
}
