文字颜色渐变

using UnityEngine;
using System.Collections.Generic;
using UnityEngine.UI;
 
[AddComponentMenu("UI/Effects/Text Vertical Gradient Color")]
[RequireComponent(typeof(Text))]
public class TextVerticalGradientThreeColor : BaseMeshEffect
{
    public Color colorTop = Color.red;
    public Color colorCenter = Color.blue;
    public Color colorBottom = Color.green;
 
    public bool MultiplyTextColor = false;
 
    protected TextVerticalGradientThreeColor()
    {
    }
 
    public static Color32 Multiply(Color32 a, Color32 b)
    {
        a.r = (byte) ((a.r * b.r) >> 8);
        a.g = (byte) ((a.g * b.g) >> 8);
        a.b = (byte) ((a.b * b.b) >> 8);
        a.a = (byte) ((a.a * b.a) >> 8);
        return a;
    }
 
    private void ModifyVertices(VertexHelper vh)
    {
        List<UIVertex> verts = new List<UIVertex>(vh.currentVertCount);
        vh.GetUIVertexStream(verts);
        vh.Clear();
 
        int step = 6;
 
        for (int i = 0; i < verts.Count; i += step)
        {
            //6 point
            var tl = multiplyColor(verts[i + 0], colorTop);
            var tr = multiplyColor(verts[i + 1], colorTop);
            var bl = multiplyColor(verts[i + 4], colorBottom);
            var br = multiplyColor(verts[i + 3], colorBottom);
            var cl = calcCenterVertex(verts[i + 0], verts[i + 4]);
            var cr = calcCenterVertex(verts[i + 1], verts[i + 2]);
 
            vh.AddVert(tl);
            vh.AddVert(tr);
            vh.AddVert(cr);
            vh.AddVert(cr);
            vh.AddVert(cl);
            vh.AddVert(tl);
 
            vh.AddVert(cl);
            vh.AddVert(cr);
            vh.AddVert(br);
            vh.AddVert(br);
            vh.AddVert(bl);
            vh.AddVert(cl);
        }
 
        for (int i = 0; i < vh.currentVertCount; i += 12)
        {
            vh.AddTriangle(i + 0, i + 1, i + 2);
            vh.AddTriangle(i + 3, i + 4, i + 5);
            vh.AddTriangle(i + 6, i + 7, i + 8);
            vh.AddTriangle(i + 9, i + 10, i + 11);
        }
    }
 
    private UIVertex multiplyColor(UIVertex vertex, Color color)
    {
        if (MultiplyTextColor)
            vertex.color = Multiply(vertex.color, color);
        else
            vertex.color = color;
        return vertex;
    }
 
    private UIVertex calcCenterVertex(UIVertex top, UIVertex bottom)
    {
        UIVertex center=new UIVertex();
        center.normal = (top.normal + bottom.normal) / 2;
        center.position = (top.position + bottom.position) / 2;
        center.tangent = (top.tangent + bottom.tangent) / 2;
        center.uv0 = (top.uv0 + bottom.uv0) / 2;
        center.uv1 = (top.uv1 + bottom.uv1) / 2;
 
        if (MultiplyTextColor)
        {
            //multiply color
            var color = Color.Lerp(top.color, bottom.color, 0.5f);
            center.color = Multiply(color, colorCenter);
        }
        else
        {
            center.color = colorCenter;
        }
 
        return center;
    }
 
    #region implemented abstract members of BaseMeshEffect
 
    public override void ModifyMesh(VertexHelper vh)
    {
        if (!this.IsActive())
        {
            return;
        }
 
 
        ModifyVertices(vh);
    }
 
    #endregion
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;
  
[RequireComponent(typeof(Text))]
public class TextVerticalGradientTwoColor : BaseMeshEffect
{
  
     
    public Color colorTop = Color.red;
    public Color colorBottom = Color.green;
  
    protected TextVerticalGradientTwoColor()
    {
  
    }
  
    private static void setColor(List<UIVertex> verts, int index, Color32 c)
    {
        UIVertex vertex = verts[index];
        vertex.color = c;
        verts[index] = vertex;
    }
  
    private void ModifyVertices(List<UIVertex> verts)
    {
        for (int i = 0; i < verts.Count; i += 6)
        {
            setColor(verts, i + 0, colorTop);
            setColor(verts, i + 1, colorTop);
            setColor(verts, i + 2, colorBottom);
            setColor(verts, i + 3, colorBottom);
  
            setColor(verts, i + 4, colorBottom);
            setColor(verts, i + 5, colorTop);
        }
    }
  
    #region implemented abstract members of BaseMeshEffect
  
    public override void ModifyMesh(VertexHelper vh)
    {
        if (!this.IsActive())
        {
            return;
        }
        List<UIVertex> verts = new List<UIVertex>(vh.currentVertCount);
        vh.GetUIVertexStream(verts);
  
        ModifyVertices(verts);
  
        vh.Clear();
        vh.AddUIVertexTriangleStream(verts);
    }
  
    #endregion
}