unity3d：text描边

最新推荐文章于 2024-02-06 15:21:08 发布

原创最新推荐文章于 2024-02-06 15:21:08 发布 · 1.2k 阅读

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#unity3d #text #描边

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这篇博客详细介绍了Unity中实现UI元素Bold Outline效果的代码实现，通过使用`ModifyMesh`方法和`Shadow`类扩展，实现了四个方向的描边阴影。代码中还包含了一个经济模式（Eco Mode），在帧率有限的情况下只应用两个方向的阴影以节省性能。

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

namespace Effects
{
    [RequireComponent(typeof(Text))]
    [AddComponentMenu("UI/Effects/BoldOutline")]
    public class BoldOutline : Shadow
    {
        public bool IsEcoMode = true;
        public static List<UIVertex> verts = new List<UIVertex>();
        const int OUTLINE_BUDGET = 50;
        static int frameNo = 0;
        static int iBudgetUsed = 0;


        public override void ModifyMesh(VertexHelper vh)
        {
            bool bIsBudgetEnough = true;
            if(Time.frameCount ==frameNo)
            {
                if (iBudgetUsed >= OUTLINE_BUDGET)
                {
                    bIsBudgetEnough = false;
                }
                else
                {
                    iBudgetUsed++;
                }
            }
            else
            {
                frameNo = Time.frameCount;
                iBudgetUsed = 0;
            }
            
            if (!IsActive())
                return;

            verts.Clear();
            vh.GetUIVertexStream(verts);

            var neededCpacity = verts.Count * 5;
            if (verts.Capacity < neededCpacity)
                verts.Capacity = neededCpacity;

            var start = 0;
            var end = verts.Count;
            ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, effectDistance.x, effectDistance.y);

            start = end;
            end = verts.Count;
            ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, -effectDistance.x, -effectDistance.y);

            if(bIsBudgetEnough)
            {
                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, effectDistance.x, -effectDistance.y);

                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, -effectDistance.x, effectDistance.y);
            }
           
            if(!IsEcoMode)
            {
                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, effectDistance.x, 0);

                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, -effectDistance.x, 0);

                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, 0, effectDistance.y);

                start = end;
                end = verts.Count;
                ApplyShadowZeroAlloc(verts, effectColor, start, verts.Count, 0, -effectDistance.y);
            }
            vh.Clear();
            vh.AddUIVertexTriangleStream(verts);
            verts.Clear();
        }
    }
}