81 lines
1.9 KiB
C#
81 lines
1.9 KiB
C#
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using UnityEngine;
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine.UI;
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/// <summary>
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/// 渐变效果 右上->左下的渐变
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/// </summary>
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[AddComponentMenu("UI/Effects/UIEfxGradient")]
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public class UIEfxGradient : BaseMeshEffect
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{
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public Color32 m_colorBottomLeft = Color.white;
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public Color32 m_colorTopRight = Color.black;
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public override void ModifyMesh(VertexHelper vh)
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{
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if (!IsActive())
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{
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return;
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}
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var count = vh.currentVertCount;
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if (count == 0)
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return;
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var vertexs = new List<UIVertex>();
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for (var i = 0; i < count; i++)
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{
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var vertex = new UIVertex();
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vh.PopulateUIVertex(ref vertex, i);
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vertexs.Add(vertex);
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}
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float posX = vertexs[0].position.x;
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float posY = vertexs[0].position.y;
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var topY = posY;
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var bottomY = posY;
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var leftX = posX;
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var rightX = posX;
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for (var i = 1; i < count; i++)
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{
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var y = vertexs[i].position.y;
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if (y > topY)
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{
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topY = y;
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}
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else if (y < bottomY)
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{
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bottomY = y;
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}
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var x = vertexs[i].position.x;
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if (x < leftX)
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leftX = x;
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else if (x > rightX)
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rightX = x;
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}
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var height = topY - bottomY;
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var weith = rightX - leftX;
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for (var i = 0; i < count; i++)
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{
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var vertex = vertexs[i];
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var color1 = Color32.Lerp(m_colorBottomLeft, m_colorTopRight, (vertex.position.y - bottomY) / height);
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var color2 = Color32.Lerp(m_colorBottomLeft, m_colorTopRight, (vertex.position.x - leftX) / weith);
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var color = Color32.Lerp(color1, color2, 0.5f);
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vertex.color = color;
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vh.SetUIVertex(vertex, i);
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}
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}
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}
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