UGUI文本颜色渐变

一、效果展示

二、挂载脚本

三、脚本代码

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;/*Text顶点索引顺序5-0 ---- 1| \    ||  \   ||   \  ||    \ |4-----3-2
*/
/// <summary>
/// 渐变
/// </summary>
[DisallowMultipleComponent]
[AddComponentMenu("LFramework/UI/Effects/GradientText", 1)]
public class GradientText : BaseMeshEffect
{protected GradientText(){}/// <summary>/// 渐变方向/// </summary>public enum EGradientDir{TopToBottom,BottomToTop,LeftToRight,RightToLeft,}/// <summary>/// 渐变方向/// </summary>[SerializeField]EGradientDir m_GradientDir = EGradientDir.TopToBottom;public EGradientDir GradientDir{get{return m_GradientDir;}set{m_GradientDir = value;graphic.SetVerticesDirty();}}//颜色数组[SerializeField]Color32[] m_ColorArray = new Color32[2] { Color.black, Color.white };public Color32[] ColorArray{get{return m_ColorArray;}set{m_ColorArray = value;graphic.SetVerticesDirty();}}//顶点缓存List<UIVertex> m_VertexCache = new List<UIVertex>();//绘制使用的顶点列表List<UIVertex> m_VertexList = new List<UIVertex>();public override void ModifyMesh(VertexHelper vh){if (!IsActive()){return;}vh.GetUIVertexStream(m_VertexCache);switch (m_GradientDir){case EGradientDir.TopToBottom:ApplyGradient_TopToBottom(m_VertexCache);break;case EGradientDir.BottomToTop:ApplyGradient_BottomToTop(m_VertexCache);break;case EGradientDir.LeftToRight:ApplyGradient_LeftToRight(m_VertexCache);break;case EGradientDir.RightToLeft:ApplyGradient_RightToLeft(m_VertexCache);break;default:break;}vh.Clear();vh.AddUIVertexTriangleStream(m_VertexList);m_VertexCache.Clear();m_VertexList.Clear();}void ApplyGradient_TopToBottom(List<UIVertex> vertexCache){if (vertexCache.Count == 0){return;}if (m_ColorArray.Length < 2){return;}int vertexCountPer = 6;//每一个文字的顶点数int vertexCount = vertexCache.Count;int colorCount = m_ColorArray.Length;for (int n = 0; n < vertexCount / 6; n++){UIVertex lastVertexLB = new UIVertex();UIVertex lastVertexRB = new UIVertex();for (int i = 0; i < colorCount - 1; i++){UIVertex vertexRT;UIVertex vertexLT;UIVertex vertexRB;UIVertex vertexLB;//左上角和右上角if (i == 0){vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], m_ColorArray[i]);vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], m_ColorArray[i]);}else{vertexLT = lastVertexLB;vertexRT = lastVertexRB;}//左下角和右下角if (i == colorCount - 2){vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], m_ColorArray[i + 1]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], m_ColorArray[i + 1]);}else{vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], vertexCache[n * vertexCountPer + 0],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], vertexCache[n * vertexCountPer + 1],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);}lastVertexLB = vertexLB;lastVertexRB = vertexRB;m_VertexList.Add(vertexLT);m_VertexList.Add(vertexRT);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexLB);m_VertexList.Add(vertexLT);}}}void ApplyGradient_BottomToTop(List<UIVertex> vertexCache){if (vertexCache.Count == 0){return;}if (m_ColorArray.Length < 2){return;}int vertexCountPer = 6;//每一个文字的顶点数int vertexCount = vertexCache.Count;int colorCount = m_ColorArray.Length;for (int n = 0; n < vertexCount / 6; n++){UIVertex lastVertexLT = new UIVertex();UIVertex lastVertexRT = new UIVertex();for (int i = 0; i < colorCount - 1; i++){UIVertex vertexRT;UIVertex vertexLT;UIVertex vertexRB;UIVertex vertexLB;//左下角和右下角if (i == 0){vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], m_ColorArray[i]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], m_ColorArray[i]);}else{vertexLB = lastVertexLT;vertexRB = lastVertexRT;}//左上角和右上角if (i == colorCount - 2){vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], m_ColorArray[i + 1]);vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], m_ColorArray[i + 1]);}else{vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], vertexCache[n * vertexCountPer + 4],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], vertexCache[n * vertexCountPer + 2],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);}lastVertexLT = vertexLT;lastVertexRT = vertexRT;m_VertexList.Add(vertexLT);m_VertexList.Add(vertexRT);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexLB);m_VertexList.Add(vertexLT);}}}void ApplyGradient_LeftToRight(List<UIVertex> vertexCache){if (vertexCache.Count == 0){return;}if (m_ColorArray.Length < 2){return;}int vertexCountPer = 6;//每一个文字的顶点数int vertexCount = vertexCache.Count;int colorCount = m_ColorArray.Length;for (int n = 0; n < vertexCount / 6; n++){UIVertex lastVertexRT = new UIVertex();UIVertex lastVertexRB = new UIVertex();for (int i = 0; i < colorCount - 1; i++){UIVertex vertexRT;UIVertex vertexLT;UIVertex vertexRB;UIVertex vertexLB;//左上角和左下角if (i == 0){vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], m_ColorArray[i]);vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], m_ColorArray[i]);}else{vertexLT = lastVertexRT;vertexLB = lastVertexRB;}//右上角和右下角if (i == colorCount - 2){vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], m_ColorArray[i + 1]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], m_ColorArray[i + 1]);}else{vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], vertexCache[n * vertexCountPer + 0],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], vertexCache[n * vertexCountPer + 4],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);}lastVertexRT = vertexRT;lastVertexRB = vertexRB;m_VertexList.Add(vertexLT);m_VertexList.Add(vertexRT);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexLB);m_VertexList.Add(vertexLT);}}}void ApplyGradient_RightToLeft(List<UIVertex> vertexCache){if (vertexCache.Count == 0){return;}if (m_ColorArray.Length < 2){return;}int vertexCountPer = 6;//每一个文字的顶点数int vertexCount = vertexCache.Count;int colorCount = m_ColorArray.Length;for (int n = 0; n < vertexCount / 6; n++){UIVertex lastVertexLT = new UIVertex();UIVertex lastVertexLB = new UIVertex();for (int i = 0; i < colorCount - 1; i++){UIVertex vertexRT;UIVertex vertexLT;UIVertex vertexRB;UIVertex vertexLB;//右上角和右下角if (i == 0){vertexRT = CalcVertex(vertexCache[n * vertexCountPer + 1], m_ColorArray[i]);vertexRB = CalcVertex(vertexCache[n * vertexCountPer + 2], m_ColorArray[i]);}else{vertexRT = lastVertexLT;vertexRB = lastVertexLB;}//左上角和左下角if (i == colorCount - 2){vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], m_ColorArray[i + 1]);vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], m_ColorArray[i + 1]);}else{vertexLT = CalcVertex(vertexCache[n * vertexCountPer + 0], vertexCache[n * vertexCountPer + 1],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);vertexLB = CalcVertex(vertexCache[n * vertexCountPer + 4], vertexCache[n * vertexCountPer + 2],(colorCount - i - 2) * 1f / (colorCount - 1), m_ColorArray[i + 1]);}lastVertexLT = vertexLT;lastVertexLB = vertexLB;m_VertexList.Add(vertexLT);m_VertexList.Add(vertexRT);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexRB);m_VertexList.Add(vertexLB);m_VertexList.Add(vertexLT);}}}/// <summary>/// 计算顶点数据(只计算颜色)/// </summary>UIVertex CalcVertex(UIVertex vertex, Color32 color){vertex.color = color;return vertex;}/// <summary>/// 计算顶点数据/// </summary>UIVertex CalcVertex(UIVertex vertexA, UIVertex vertexB, float ratio, Color32 color){UIVertex vertexTemp = new UIVertex();vertexTemp.position = (vertexB.position - vertexA.position) * ratio + vertexA.position;vertexTemp.color = color;vertexTemp.normal = (vertexB.normal - vertexA.normal) * ratio + vertexA.normal;vertexTemp.tangent = (vertexB.tangent - vertexA.tangent) * ratio + vertexA.tangent;vertexTemp.uv0 = (vertexB.uv0 - vertexA.uv0) * ratio + vertexA.uv0;vertexTemp.uv1 = (vertexB.uv1 - vertexA.uv1) * ratio + vertexA.uv1;return vertexTemp;}
}

四、推荐参考

51CTO博客：Unity中实现UI渐变_mb60e5417d375b8的技术博客_51CTO博客

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