Unity:Animation:Scale

Scale.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// Scales proportionally a gameobject over  the X and Z axis
/// </summary>
public class Scale : MonoBehaviour {

	/// <summary>
	/// The expected final scale (1.0f is the current scale)
	/// </summary>
	public float finalScale =0.0f; // X-Z

	/// <summary>
	/// Total time the gameobject will spend to scale
	/// </summary>
	public float animationTime = 1.0f;

	/// <summary>
	/// If reverse is selected, the gameobject will start at the final scale and it will change until it achieves its current scale
	/// </summary>
	public bool reverse;

	private float diff ;
	private float startTime;
	private Vector3 startVec;
	private Vector3 finalVec;

	/// <summary>
	/// Initialization when enabled
	/// </summary>
	void OnEnable () {
		startTime = Time.time;
		startVec = gameObject.transform.localScale;
		finalVec = gameObject.transform.localScale * finalScale;
		finalVec.y = gameObject.transform.localScale.y;

		if (reverse) {
			Vector3 temp = startVec;
			startVec = finalVec;
			finalVec = temp;
			transform.localScale = finalVec;
		}
	}


	// Update is called once per frame
	void Update () {
		float timeCovered = (Time.time - startTime);
		float fracTime = timeCovered / animationTime;
		transform.localScale = Vector3.Lerp(startVec, finalVec, fracTime);
	}
}