Unity3D实现渐变颜色效果

基于unity3D实现渐变颜⾊的简单脚本，代码很少，就不废话了，直接上代码和效果图。

效果图：

using System;

using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;

namespace ExtraFoundation.Components{

[AddComponentMenu(\"UI/Effects/Gradient\")] public class UIGradient : BaseMeshEffect {

#region Public Declarations public enum Type {

Vertical, Horizontal }

#endregion

#region Public Properties

public Type GradientType = Type.Vertical; [Range(-1f, 1f)]

public float Offset = 0f; public Gradient gradient; #endregion

#region Public Methods

public override void ModifyMesh(VertexHelper helper) {

if (!IsActive() || helper.currentVertCount == 0) {

return; }

vertexList.Clear();

helper.GetUIVertexStream(vertexList);

int nCount = vertexList.Count; switch (GradientType) {

case Type.Vertical: {

float fBottomY = vertexList[0].position.y; float fTopY = vertexList[0].position.y; float fYPos = 0f;

for (int i = nCount - 1; i >= 1; --i) {

fYPos = vertexList[i].position.y;

if (fYPos > fTopY) fTopY = fYPos;

else if (fYPos < fBottomY) fBottomY = fYPos; }

float fUIElementHeight = 1f / (fTopY - fBottomY); UIVertex v = new UIVertex();

for (int i = 0; i < helper.currentVertCount; i++) {

helper.PopulateUIVertex(ref v, i);

v.color = gradient.Evaluate((v.position.y - fBottomY) * fUIElementHeight - Offset); helper.SetUIVertex(v, i); } }

break;

case Type.Horizontal: {

float fLeftX = vertexList[0].position.x; float fRightX = vertexList[0].position.x; float fXPos = 0f;

for (int i = nCount - 1; i >= 1; --i) {

fXPos = vertexList[i].position.x; if (fXPos > fRightX) fRightX = fXPos;

else if (fXPos < fLeftX) fLeftX = fXPos; }

float fUIElementWidth = 1f / (fRightX - fLeftX); UIVertex v = new UIVertex();

for (int i = 0; i < helper.currentVertCount; i++) {

helper.PopulateUIVertex(ref v, i);

v.color = gradient.Evaluate((v.position.x - fLeftX) * fUIElementWidth - Offset); helper.SetUIVertex(v, i); } }

break; default: break; } }

#endregion

#region Internal Fields

private List vertexList = new List(); #endregion }}

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