Curve.cs

using UnityEngine;

public class Wave : MonoBehaviour {
	
	public float stayLow = 2f;
	public float stayHigh = 2f;
	
	private void OnDrawGizmos() {
		var p0 = Vector2.zero;
		for (var i = 0; i < 400; i++) {
			var p1 = new Vector2(i / 20f, Curve(i / 20f, stayLow, stayHigh));
			Gizmos.DrawLine(p0, p1);
			Gizmos.DrawSphere(p1, .1f);
			p0 = p1;
		}
	}

	static float Curve(float t, float stayLow, float stayHigh) {
		var zeroToOne = Mathf.Clamp01(Mathf.PingPong(t, 1 + stayHigh + stayLow) - stayLow);
		// replace with any easing function that accepts 0-1 as input
		return easeOutQuad(zeroToOne);
	}
	
	public static float easeInOutQuad(float t) {
		if (t < 0.5f) return 2 * t * t;
		return (-2 * t * t) + (4 * t) - 1;
	}

	public static float easeInQuad(float t) {
		return t * t;
	}

	public static float easeOutQuad(float t) {
		return -(t * (t - 2));
	}
}