unity实现刮刮乐效果，网上一大堆使用ugui实现的，但没有一篇解释使用fgui的，本篇文章基于fgui实现刮刮乐效果。
核心代码来源于这个篇博客，这篇博客基于ugui实现的，我把它换成了fgui的方式
https://blog.csdn.net/qq_39108767/article/details/103412395
using System;using UnityEngine;using FairyGUI;public class FguiErasePoint : MonoBehaviour{ //遮罩 要操作的对象 private GLoader maskLoader; //要操作的纹理 新建出来的 private Texture2D eraseTexture; //图片大小 private float textureLength; //擦除部分图片大小 private float eraseLength; //纹理宽度 private int textureWidth; //纹理高度 private int textureHeight; //擦除完成调用事件 public Action eraseFinishEvent; //擦除比例，擦除比例高于该值，是为擦除完成，自动擦除剩余部分 private float finishPercent = 0.9f; //当前进度 private float currentPercent; //擦除的半径 public int radius = 10; //遍历时候 上下左右的值 private int startX, endX, startY, endY, pixelY; //鼠标的坐标 private Vector3 tmpLocalPos; //是否以擦除完成 private bool isFinish; private void Start() { GComponent component = this.GetComponent<UIPanel>().ui; maskLoader = component.GetChild("n3").asLoader; //加载出文理 Texture2D tmp = Resources.Load<Texture2D>("testTexture"); //创建一个新的文理 后续操作这个文理 eraseTexture = new Texture2D(tmp.width, tmp.height, TextureFormat.ARGB32, false); eraseTexture.SetPixels(tmp.GetPixels()); eraseTexture.Apply(); //将创建的新文理 传给GLoader NTexture nTexture = new NTexture(eraseTexture); maskLoader.texture = nTexture; textureWidth = eraseTexture.width; textureHeight = eraseTexture.height; textureLength = eraseTexture.GetPixels().Length; //添加事件 component.onTouchBegin.Add(OnTouchBegin); component.onTouchMove.Add(OnTouchMove); component.onTouchEnd.Add(OnTouchEnd); } private void OnTouchBegin(EventContext context) { if (isFinish) return; ErasePoint(context.inputEvent.position); context.CaptureTouch(); } private void OnTouchMove(EventContext context) { if (isFinish) return; ErasePoint(context.inputEvent.position); } private void OnTouchEnd(EventContext context) { if (isFinish) return; ErasePoint(context.inputEvent.position); } private void ErasePoint(Vector3 pScreenPos) { //屏幕坐标——>本地坐标 tmpLocalPos = maskLoader.GlobalToLocal(pScreenPos); //点击位置是否在图片范围内 if (tmpLocalPos.x < 0 || tmpLocalPos.x >= textureWidth || tmpLocalPos.y < 0 || tmpLocalPos.y > textureHeight) { return; } //最大最小值 已鼠标点为中心 startX = (int)tmpLocalPos.x - radius; endX = (int)tmpLocalPos.x + radius; startY = (int)tmpLocalPos.y - radius; endY = (int)tmpLocalPos.y + radius; for (int i = startX - 1; i < endX; i++) { //超左/右边界 if (i < 0 || i >= textureWidth) continue; for (int j = startY - 1; j < endY; j++) { //fgui坐标是左上角开始的 y坐标需要做个减法 才能对应到像素坐标 pixelY = textureHeight - j; //超上/下边界 if (pixelY < 0 || pixelY >= textureHeight) { continue; } //是否在圆形范围内 if (Vector3.Distance(new Vector3(i, j), tmpLocalPos) > radius) { continue; } //像素点色值 Color col = eraseTexture.GetPixel(i, pixelY); //判断透明度,是否已擦除 if (Mathf.Approximately(col.a, 0)) continue; //修改像素点透明度 col.a = 0.0f; eraseTexture.SetPixel(i, pixelY, col); //擦除数量统计 eraseLength++; } } eraseTexture.Apply(); //判断擦除进度 RefreshErasePercent(); } private void RefreshErasePercent() { if (isFinish) return; currentPercent = eraseLength / textureLength; currentPercent = (float)Math.Round(currentPercent, 2); Debug.Log("擦除百分比 : " + currentPercent); if (currentPercent >= finishPercent) { isFinish = true; //触发结束事件 eraseFinishEvent?.Invoke(); } }}