/// Credit Breyer
/// Sourced from - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/#post-1777407

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;

[RequireComponent(typeof(Text),typeof(RectTransform))]
public class CurvedText : BaseVertexEffect
{
		public AnimationCurve curveForText = AnimationCurve.Linear (0, 0, 1, 10);
		public float curveMultiplier = 1;
		private RectTransform rectTrans;


#if UNITY_EDITOR
		protected override void OnValidate ()
		{
				base.OnValidate ();
				if (curveForText [0].time != 0) {
						var tmpRect = curveForText [0];
						tmpRect.time = 0;
						curveForText.MoveKey (0, tmpRect);
				}
				if (rectTrans == null)
						rectTrans = GetComponent<RectTransform> ();
				if (curveForText [curveForText.length - 1].time != rectTrans.rect.width)
						OnRectTransformDimensionsChange ();
		}
#endif
		protected override void Awake ()
		{
				base.Awake ();
				rectTrans = GetComponent<RectTransform> ();
				OnRectTransformDimensionsChange ();
		}
		protected override void OnEnable ()
		{
				base.OnEnable ();
				rectTrans = GetComponent<RectTransform> ();
				OnRectTransformDimensionsChange ();
		}
		public override void ModifyVertices (System.Collections.Generic.List<UIVertex> verts)
		{
				if (!IsActive ())
						return;
		
				for (int index = 0; index < verts.Count; index++) {
						var uiVertex = verts [index];
						//Debug.Log ();
						uiVertex.position.y += curveForText.Evaluate (rectTrans.rect.width * rectTrans.pivot.x + uiVertex.position.x) * curveMultiplier;
						verts [index] = uiVertex;
				}
		}
		protected override void OnRectTransformDimensionsChange ()
		{
				var tmpRect = curveForText [curveForText.length - 1];
				tmpRect.time = rectTrans.rect.width;
				curveForText.MoveKey (curveForText.length - 1, tmpRect);
		}
}