Text 그라데이션

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
 
[AddComponentMenu("UI/Effects/Gradient")]
public class Gradient : BaseVertexEffect {
    [SerializeField]
    private Color32 topColor = Color.white;
    [SerializeField]
    private Color32 bottomColor = Color.black;
 
    public override void ModifyVertices(List<UIVertex> vertexList) {
        if (!IsActive()) {
            return;
        }
 
        int count = vertexList.Count;
        float bottomY = vertexList[0].position.y;
        float topY = vertexList[0].position.y;
 
        for (int i = 1; i < count; i++) {
            float y = vertexList[i].position.y;
            if (y > topY) {
                topY = y;
            }
            else if (y < bottomY) {
                bottomY = y;
            }
        }
 
        float uiElementHeight = topY - bottomY;
 
        for (int i = 0; i < count; i++) {
            UIVertex uiVertex = vertexList[i];
            uiVertex.color = Color32.Lerp(bottomColor, topColor, (uiVertex.position.y - bottomY) / uiElementHeight);
            vertexList[i] = uiVertex;
        }
    }
}