Start of a tween system

TweenUtils.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public delegate float TweenFunc(float t);

public static class TweenUtils {


	public static float LinearTween(float t){
		return t;
	}
	public static float QuadTween(float t){
		return t*t;
	}


	public static void Linear(float start, float end, float time, Action<float> callback) {
		GameObject obj = new GameObject();
   		obj.AddComponent<TweenBehaviour>().StartCoroutine(DoTween(start, end, time, callback, LinearTween));
	}
	public static void Quad(float start, float end, float time, Action<float> callback) {
		GameObject obj = new GameObject();
   		obj.AddComponent<TweenBehaviour>().StartCoroutine(DoTween(start, end, time, callback, QuadTween));
	}
	public static void Free(float start, float end, float time, Action<float> callback, TweenFunc func) {
		GameObject obj = new GameObject();
   		obj.AddComponent<TweenBehaviour>().StartCoroutine(DoTween(start, end, time, callback, func));
	}
	

	static IEnumerator DoTween(float start, float end, float time, Action<float> callback, TweenFunc func){
		float t = 0;
		do {
			callback(Mathf.Lerp(start, end, func(t / time)));
			t += Time.deltaTime;
			yield return new WaitForEndOfFrame();
		} while (t < time);
		callback(Mathf.Lerp(start, end, 1));
	}

}

public class TweenBehaviour : MonoBehaviour {

}