111 lines
3.3 KiB
C#
111 lines
3.3 KiB
C#
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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/********************************************************************************
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*Create By CG
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*Function 渐变图片
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*********************************************************************************/
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namespace ZXK.UTility
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{
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[AddComponentMenu("UI/Effects/Gradient")]
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public class UiGradient : BaseMeshEffect
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{
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[SerializeField]
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private DirType _dir = DirType.Vertical;
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[SerializeField]
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private BlendType _blend = BlendType.Override;
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[SerializeField, Range(-1, 1)]
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private float _offset = 0f;
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[SerializeField]
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private Gradient _gradient = new Gradient() { colorKeys = new GradientColorKey[] { new GradientColorKey(Color.black, 0), new GradientColorKey(Color.white, 1) } };
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public override void ModifyMesh(VertexHelper vh)
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{
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if (!IsActive() || vh.currentVertCount == 0)
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{
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return;
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}
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var vertexs = new List<UIVertex>();
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vh.GetUIVertexStream(vertexs);
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bool isX = true;
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switch (_dir)
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{
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case DirType.Horizontal:
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isX = true;
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break;
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case DirType.Vertical:
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isX = false;
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break;
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default:
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break;
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}
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var inverseLength = GetInverseLength(vertexs, isX, out float min, out float max);
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var vertex = new UIVertex();
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for (int i = 0; i < vh.currentVertCount; i++)
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{
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vh.PopulateUIVertex(ref vertex, i);
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vertex.color = BlendColor(vertex.color, _gradient.Evaluate((isX ? (vertex.position.x - min) : (vertex.position.y - min)) * inverseLength - _offset), _blend);
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vh.SetUIVertex(vertex, i);
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}
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}
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// 若isX是false，则认为是y
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private float GetInverseLength(List<UIVertex> vertexs, bool isX, out float min, out float max)
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{
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float inverseLength = 0;
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min = isX ? vertexs[0].position.x : vertexs[0].position.y;
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max = min;
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for (int i = 1; i < vertexs.Count; i++)
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{
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var temp = isX ? vertexs[i].position.x : vertexs[i].position.y;
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if (temp > max)
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{
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max = temp;
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}
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else if (temp < min)
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{
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min = temp;
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}
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}
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inverseLength = 1 / (max - min);
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return inverseLength;
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}
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private Color BlendColor(Color originalColor, Color newColor, BlendType blendType)
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{
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var ret = newColor;
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switch (blendType)
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{
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case BlendType.Override: ret = newColor; break;
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case BlendType.Add: ret = originalColor + newColor; break;
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case BlendType.Multiply: ret = originalColor * newColor; break;
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default: break;
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}
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return ret;
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}
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private enum DirType
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{
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None,
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Horizontal,
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Vertical,
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}
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private enum BlendType
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{
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None,
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Override,
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Add,
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Multiply
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}
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}
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} |