public class ExpandingParticleRing : MonoBehaviour
{
	[Header("References"), SerializeField]
	protected ParticleSystem particleRing;

	[Header("Tweaks"), SerializeField]
	protected float radiusThickness = 0.1f;
	[SerializeField]
	protected float startRadius = 0.1f;
	[SerializeField]
	protected float radiusExpansionRate = 1.0f;
	[SerializeField]
	protected float startEmission = 50.0f;

	protected float emissionPerUnitCircumference = 0.0f;

	void OnEnable()
	{
		if (particleRing == null) { return; }

		ParticleSystem.ShapeModule particleShape = particleRing.shape;
		particleShape.radius = startRadius;
		particleShape.radiusThickness = radiusThickness;
		ParticleSystem.EmissionModule particleEmission = particleRing.emission;
		particleEmission.rateOverTime = startEmission;

		emissionPerUnitCircumference = startEmission / (Mathf.PI * startRadius * 2.0f);
	}

	void Update()
	{
		float deltaTime = PhysicsManager.GetDeltaTimeFor(gameObject);

		ParticleSystem.ShapeModule particleShape = particleRing.shape;
		particleShape.radius += radiusExpansionRate * deltaTime;
		particleShape.radiusThickness = radiusThickness; // (resets every time we set radius, I think?)


		ParticleSystem.EmissionModule particleEmission = particleRing.emission;
		particleEmission.rateOverTime = Mathf.PI * particleShape.radius * 2.0f * emissionPerUnitCircumference;
	}
}