Unity简单实现老虎机抽奖效果

一、演示效果

二、使用工具

Unity：2019.4.36
VS：2017

三、场景搭建

1、右键—>UI—>RawImage
（自己摆好位置并设置好大小，然后选择图片，挂载RawImageTest脚本。本案例需要创建6个RawImage，分别是一个背景图片、三列水果和两块遮板，背景图片必须放在最上面）

2、右键—>UI—>Button
（同样自己摆好位置并修改大小，然后修改一下自己需要显示的字。这两个按钮是用来控制游戏的开始和暂停的，具体逻辑是当没有按下开始按钮时，暂停按钮不允许被点击；当按下开始按钮后，暂停按钮就被激活，同时开始按钮就不允许被点击了；当按下暂停按钮，暂停按钮立即不允许被点击，开始按钮必须等老虎机停止才被激活）

3、创建一个空物体，用来挂载游戏控制脚本
4、总体预览

四、代码

1、RawImageTest.cs

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

public class RawImageTest : MonoBehaviour
{
    static int totalNum;  // 场景里该脚本的总数
    static int stopNum;  // 当前已经停止的数量
    bool selfIsStop = true;  // 自己是否停止

    RawImage raw;
    Rect r;
    public float speed;
    float[] a = new float[] { 0, 0.2f, 0.4f, 0.6f, 0.8f };  //每个图片的位置
    int n;
    float m;

    public GameControl gameControl;

    // Start is called before the first frame update
    void Start()
    {
        totalNum++;
        raw = GetComponent<RawImage>();
        r = raw.uvRect;
        n = Random.Range(0, 5);
        r.y = a[n];
        raw.uvRect = r;
        gameControl = GameObject.Find("GameObject").GetComponent<GameControl>();
        speed = Random.Range(0.5f, 2f);
        m = Random.Range(0.001f, 0.004f);
    }

    // Update is called once per frame
    void Update()
    {
        if (gameControl.state == GameState.Start)  //当按下开始键
        {
            stopNum = 0;  //重置停止的脚本数量
            selfIsStop = false;
            r.y += Time.deltaTime * speed;
            raw.uvRect = r;
        }
        else if (gameControl.state == GameState.Pause)
        {
            if (!selfIsStop)
            {
                if (speed > 0)
                {
                    speed -= m;
                    r.y += Time.deltaTime * speed;
                    raw.uvRect = r;
                }
                else
                {
                    selfIsStop = true;
                    speed = Random.Range(0.5f, 2f);
                    m = Random.Range(0.001f, 0.004f);
                    r.y = a[GetPos(r.y)];
                    raw.uvRect = r;
                    stopNum++;
                    if (stopNum >= totalNum)
                    {
                        gameControl.state = GameState.Stop;
                    }
                }
            }
        }
    }

    //获取将要停止的位置
    private int GetPos(float num)
    {
        float t = num - Mathf.Floor(num);  //获取小数部分
        for (int i = 0; i < 4; i++)
        {
            if (t >= a[i] && t <= a[i + 1])
            {
                return i + 1;
            }
        }
        return 0;
    }
}

2、GameControl.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;  //引入命名空间

public enum GameState  //用来记录三种状态
{
    Start,
    Pause,
    Stop
}

public class GameControl : MonoBehaviour
{
    public Button StartBtn;  //通过Unity中拖拽获得
    public Button PauseBtn;
    public GameState state;
    bool isStart = false;

    // Start is called before the first frame update
    void Start()
    {
        StartBtn.interactable = true;
        PauseBtn.interactable = false;
        StartBtn.onClick.AddListener(StartGame);  //给按钮添加事件
        PauseBtn.onClick.AddListener(PauseGame);

        state = GameState.Stop;
    }

    // Update is called once per frame
    void Update()
    {
        if (isStart && state == GameState.Stop)
        {
            StartBtn.interactable = true;
        }
    }

    public void StartGame()
    {
        isStart = false;
        StartBtn.interactable = false;
        PauseBtn.interactable = true;

        state = GameState.Start;
    }

    public void PauseGame()
    {
        isStart = true;
        PauseBtn.interactable = false;

        state = GameState.Pause;
    }
}

五、项目链接

链接：https://pan.baidu.com/s/1tDwAbKd4zHEO0ySXXTY7_w
提取码：pjqm