74 lines
1.9 KiB
C#
74 lines
1.9 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UI;
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/// <summary>
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/// 多边形 顺时针 先添加中心点 (0,0), 在添加N个顶点就可以了
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/// [转] http://www.xshadow.org/index.php/archives/73
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/// </summary>
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public class UIPolygon : Graphic
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{
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public List<Vector2> m_VertexList = new List<Vector2>(); // 顶点坐标列表 数量必须大于2
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private VertexHelper m_VertexHelper;
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public void Refresh()
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{
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if (m_VertexHelper == null)
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{
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Debug.Log("m_VertexHelper == null");
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return;
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}
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m_VertexHelper.Clear();
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List<UIVertex> targetVertexList = new List<UIVertex>();
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int triangleCount = m_VertexList.Count - 1;
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for (int i = 0; i < triangleCount; i++)
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{
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// 组建三角形
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for (int j = 0; j < 3; j++)
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{
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UIVertex vertex = new UIVertex();
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if (j == 2)
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vertex.position = m_VertexList[0];
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else
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{
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int vertexIndex = i + j + 1;
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if (vertexIndex > triangleCount)
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vertex.position = m_VertexList[1];
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else
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vertex.position = m_VertexList[vertexIndex];
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}
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vertex.color = color;
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if (j == 2)
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//vertex.color = new Color(color.r, color.g, color.b, 0);
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vertex.color = new Color(0,0,0, 0);
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targetVertexList.Add(vertex);
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}
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}
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m_VertexHelper.AddUIVertexTriangleStream(targetVertexList);
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}
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protected override void OnPopulateMesh(VertexHelper vh)
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{
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base.OnPopulateMesh(vh);
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m_VertexHelper = vh;
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if (m_VertexList == null)
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return;
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if (m_VertexList.Count < 3)
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return;
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Refresh();
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}
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}
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