[UGUI]修改顶点

2022-12-13 21:49:30

参考链接：

https://blog.csdn.net/jk823394954/article/details/53870779

说明：unity版本5.3，新建一个Image，挂上以下的脚本

一.图形绘制

1.绘制三角形

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         vh.AddVert(new Vector3(, ), Color.red, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.green, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.black, Vector2.zero);

         vh.AddTriangle(, , );

     }

 }

2.绘制正方形(绘制两个三角形)

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         vh.AddVert(new Vector3(, ), Color.red, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.green, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.black, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.blue, Vector2.zero);

         vh.AddTriangle(, , );

         vh.AddTriangle(, , );

     }

 }

3.绘制正方形(绘制一个正方形)

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         UIVertex[] verts = new UIVertex[];

         verts[].position = new Vector3(, );

         verts[].color = Color.red;

         verts[].uv0 = Vector2.zero;

         verts[].position = new Vector3(, );

         verts[].color = Color.green;

         verts[].uv0 = Vector2.zero;

         verts[].position = new Vector3(, );

         verts[].color = Color.black;

         verts[].uv0 = Vector2.zero;

         verts[].position = new Vector3(, );

         verts[].color = Color.blue;

         verts[].uv0 = Vector2.zero;

         vh.AddUIVertexQuad(verts);

     }

 }

二.相关api

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         vh.AddVert(new Vector3(, ), Color.red, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.green, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.black, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.blue, Vector2.zero);

         vh.AddTriangle(, , );

         vh.AddTriangle(, , );

         //顶点有4个，索引有6个

         Debug.Log(vh.currentIndexCount);

         Debug.Log(vh.currentVertCount);

         //PopulateUIVertex，返回顶点数据。当前取值范围：0-3

         UIVertex vertex = new UIVertex();

         vh.PopulateUIVertex(ref vertex, );

         Debug.Log(vertex.color);

         vh.PopulateUIVertex(ref vertex, );

         Debug.Log(vertex.color);

         //SetUIVertex，设置顶点数据

         vertex.color = Color.yellow;

         vh.SetUIVertex(vertex, );

     }

 }

输出：

Stream流批量操作：

1.AddUIVertexStream，批量添加顶点

 using System.Collections.Generic;

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         List<UIVertex> verts = new List<UIVertex>();

         UIVertex vert0 = new UIVertex();

         vert0.position = new Vector3(, );

         vert0.color = Color.red;

         vert0.uv0 = Vector2.zero;

         verts.Add(vert0);

         UIVertex vert1 = new UIVertex();

         vert1.position = new Vector3(, );

         vert1.color = Color.green;

         vert1.uv0 = Vector2.zero;

         verts.Add(vert1);

         UIVertex vert2 = new UIVertex();

         vert2.position = new Vector3(, );

         vert2.color = Color.black;

         vert2.uv0 = Vector2.zero;

         verts.Add(vert2);

         UIVertex vert3 = new UIVertex();

         vert3.position = new Vector3(, );

         vert3.color = Color.blue;

         vert3.uv0 = Vector2.zero;

         verts.Add(vert3);

         List<int> indices = new List<int>() { , , , , ,  };

         vh.AddUIVertexStream(verts, indices);

     }

 }

2.AddUIVertexTriangleStream，批量添加三角形顶点，长度必须是3的倍数

 using System.Collections.Generic;

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         List<UIVertex> verts = new List<UIVertex>();

         UIVertex vert0 = new UIVertex();

         vert0.position = new Vector3(, );

         vert0.color = Color.red;

         vert0.uv0 = Vector2.zero;

         verts.Add(vert0);

         UIVertex vert1 = new UIVertex();

         vert1.position = new Vector3(, );

         vert1.color = Color.green;

         vert1.uv0 = Vector2.zero;

         verts.Add(vert1);

         UIVertex vert2 = new UIVertex();

         vert2.position = new Vector3(, );

         vert2.color = Color.black;

         vert2.uv0 = Vector2.zero;

         verts.Add(vert2);

         vh.AddUIVertexTriangleStream(verts);

     }

 }

3.GetUIVertexStream，获取所有顶点数据

 using System.Collections.Generic;

 using UnityEngine;

 using UnityEngine.UI;

 public class TestMesh : BaseMeshEffect {

     public override void ModifyMesh(VertexHelper vh)

     {

         vh.Clear();

         vh.AddVert(new Vector3(, ), Color.red, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.green, Vector2.zero);

         vh.AddVert(new Vector3(, ), Color.black, Vector2.zero);

         vh.AddTriangle(, , );

         List<UIVertex> stream = new List<UIVertex>();

         vh.GetUIVertexStream(stream);

         foreach (UIVertex v in stream)

         {

             Debug.Log(v.color);

         }

     }

 }

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