CurvedText.cs

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

[RequireComponent( typeof( Text ), typeof( RectTransform ) )]
public class CurvedText : BaseMeshEffect
{
    public AnimationCurve curveForText = AnimationCurve.Linear( 0, 0, 1, 10 );
    public float curveMultiplier = 1;
    public 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 ModifyMesh( VertexHelper vh )
    {
        if ( !IsActive() )
            return;

        var verts = new List<UIVertex>();
        vh.GetUIVertexStream( verts );

        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;
        }

        vh.Clear();
        vh.AddUIVertexTriangleStream( verts );
    }
    protected override void OnRectTransformDimensionsChange()
    {
        var tmpRect = curveForText[ curveForText.length - 1 ];
        tmpRect.time = rectTrans.rect.width;
        curveForText.MoveKey( curveForText.length - 1, tmpRect );
    }
}