70 lines
1.7 KiB
C#
70 lines
1.7 KiB
C#
using UnityEngine;
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using UnityEngine.UI;
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using System.Collections.Generic;
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namespace DuloGames.UI
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{
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[AddComponentMenu("UI/Effects/Gradient")]
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#if UNITY_5_2 || UNITY_5_3_OR_NEWER
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public class Gradient : BaseMeshEffect
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#else
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public class Gradient : BaseVertexEffect
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#endif
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{
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[SerializeField] private Color topColor = Color.white;
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[SerializeField] private Color bottomColor = Color.black;
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#if UNITY_5_2 || UNITY_5_3_OR_NEWER
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public override void ModifyMesh(VertexHelper vertexHelper)
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{
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if (!this.IsActive())
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return;
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List<UIVertex> list = new List<UIVertex>();
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vertexHelper.GetUIVertexStream(list);
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ModifyVertices(list); // calls the old ModifyVertices which was used on pre 5.2
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vertexHelper.Clear();
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vertexHelper.AddUIVertexTriangleStream(list);
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}
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#endif
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#if UNITY_5_2 || UNITY_5_3_OR_NEWER
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public void ModifyVertices(List<UIVertex> vertexList)
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#else
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public override void ModifyVertices(List<UIVertex> vertexList)
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#endif
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{
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if (!this.IsActive() || vertexList.Count == 0)
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return;
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int count = vertexList.Count;
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float bottomY = vertexList[0].position.y;
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float topY = vertexList[0].position.y;
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for (int i = 1; i < count; i++)
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{
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float y = vertexList[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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}
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float uiElementHeight = topY - bottomY;
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for (int i = 0; i < count; i++)
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{
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UIVertex uiVertex = vertexList[i];
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uiVertex.color = uiVertex.color * Color.Lerp(bottomColor, topColor, (uiVertex.position.y - bottomY) / uiElementHeight);
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vertexList[i] = uiVertex;
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}
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}
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}
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}
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