67 lines
2.7 KiB
C#
67 lines
2.7 KiB
C#
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using UnityEngine;
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using UnityEngine.UI;
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using System.Collections.Generic;
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/// <summary>
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/// 特殊3段变色，上段和下段为纯色，中段有渐变效果
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/// </summary>
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public class UIGradient3Slice : BaseMeshEffect
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{
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public Color topColor = Color.white;
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public Color bottomColor = Color.black;
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public float topHeight = 0.225f;
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public float bottomHeight = 0.225f;
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public override void ModifyMesh(VertexHelper vh)
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{
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if (!IsActive())
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return;
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List<UIVertex> vertList = new List<UIVertex>(vh.currentVertCount);
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vh.GetUIVertexStream(vertList);
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vh.Clear();
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// 按每四个顶点为一个四边形
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for (int i = 0; i < vertList.Count; i += 6)
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{
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// 分解为8个顶点
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UIVertex top_0 = vertList[i];
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UIVertex top_1 = vertList[i + 1];
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UIVertex bottom_0 = vertList[i + 4];
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UIVertex bottom_1 = vertList[i + 2];
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UIVertex midUp_0 = LerpVertex(bottom_0, top_0, 1f - topHeight);
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UIVertex midUp_1 = LerpVertex(bottom_1, top_1, 1f - topHeight);
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UIVertex midDown_0 = LerpVertex(bottom_0, top_0, bottomHeight);
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UIVertex midDown_1 = LerpVertex(bottom_1, top_1, bottomHeight);
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top_0.color = topColor;
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top_1.color = topColor;
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midUp_0.color = topColor;
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midUp_1.color = topColor;
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midDown_0.color = bottomColor;
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midDown_1.color = bottomColor;
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bottom_0.color = bottomColor;
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bottom_1.color = bottomColor;
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// 重新组装为3个四边形
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WriteQuad(vh, top_0, top_1, midUp_0, midUp_1);
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WriteQuad(vh, midUp_0, midUp_1, midDown_0, midDown_1);
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WriteQuad(vh, midDown_0, midDown_1, bottom_0, bottom_1);
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}
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}
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public UIVertex LerpVertex(UIVertex a, UIVertex b, float ratio)
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{
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UIVertex result = new UIVertex();
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result.position = Vector3.Lerp(a.position, b.position, ratio);
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result.uv0 = Vector3.Lerp(a.uv0, b.uv0, ratio);
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result.uv1 = Vector3.Lerp(a.uv1, b.uv1, ratio);
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result.normal = Vector3.Lerp(a.normal, b.normal, ratio);
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result.tangent = Vector3.Lerp(a.tangent, b.tangent, ratio);
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return result;
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}
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public void WriteQuad(VertexHelper vh, UIVertex top_0, UIVertex top_1, UIVertex bottom_0, UIVertex bottom_1)
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{
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int startIndex = vh.currentVertCount;
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vh.AddVert(top_0);
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vh.AddVert(top_1);
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vh.AddVert(bottom_1);
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vh.AddVert(bottom_0);
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vh.AddTriangle(startIndex, startIndex + 1, startIndex + 2);
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vh.AddTriangle(startIndex, startIndex + 3, startIndex + 2);
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}
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}
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