Unity 简单游戏编程（1） 开始界面设计

转自：http://blog.csdn.net/qqmcy/article/details/9330405

 using UnityEngine;
 using System.Collections;

 public class Script_10_01 : MonoBehaviour
 {

     //游戏界面状态机

     //主菜单界面
     public const int STATE_MAINMENU = 0;
     //开始游戏界面
     public const int STATE_STARTGAME = 1;
     //游戏设置界面
     public const int STATE_OPTION = 2;
     //游戏帮助界面
     public const int STATE_HELP = 3;
     //游戏退出界面
     public const int STATE_EXIT = 4;

     //GUI皮肤
     public GUISkin mySkin;

     //游戏背景贴图
     public Texture textureBG;
     //开始菜单截图
     public Texture tex_startInfo;
     //帮助菜单贴图
     public Texture tex_helpInfo;

     //游戏音乐资源
     public AudioSource music;
     //当前游戏状态
     private int gameState;

     void Start ()
     {
         //初始化游戏状态为：主菜单界面
         gameState = STATE_MAINMENU;
     }

     void OnGUI()
     {

         switch(gameState)
         {
             case STATE_MAINMENU:
                 //绘制主菜单界面
                 RenderMainMenu();
             break;
             case STATE_STARTGAME:
                 //绘制游戏开始界面
                 RenderStart();
             break;
             case STATE_OPTION:
                 //绘制游戏设置界面
                 RenderOption();
             break;
             case STATE_HELP:
                 //绘制游戏帮助界面
                 RenderHelp();
             break;
             case STATE_EXIT:
                 //绘制游戏退出界面
                 //目前直接关闭退出游戏
             break;
         }


     }
     //绘制主菜单界面
     void RenderMainMenu()
     {
         //设置界面皮肤
         GUI.skin = mySkin;
         //绘制游戏背景图
         GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),textureBG);
         //开始游戏按钮
         if(GUI.Button(new Rect (0,30,623,153),"","start"))
         {
             //进入开始游戏状态
             //目前由于是测试阶段
             //后期会在这里重新载入新的游戏场景
             gameState = STATE_STARTGAME;
         }
         //游戏设置按钮
         if(GUI.Button(new Rect (0,180,623,153),"","option"))
         {
             //进入开始游戏状态
             gameState = STATE_OPTION;
         }
         //游戏帮助按钮
         if(GUI.Button(new Rect (0,320,623,153),"","help"))
         {
             //进入游戏帮助状态
             gameState = STATE_HELP;
         }
         //游戏退出按钮
         if(GUI.Button(new Rect (0,470,623,153),"","exit"))
         {
             //退出游戏
             Application.Quit();
         }
     }
     //绘制游戏开始界面
     void RenderStart()
     {
         GUI.skin = mySkin;
         GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),tex_startInfo);
         //绘制返回按钮
         if(GUI.Button(new Rect (0,500,403,78),"","back"))
         {
             //返回游戏主菜单
             gameState = STATE_MAINMENU;
         }
     }
     //绘制游戏帮助界面
     void RenderHelp()
     {
         GUI.skin = mySkin;
         GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),tex_helpInfo);
         if(GUI.Button(new Rect (0,500,403,78),"","back"))
         {
             gameState = STATE_MAINMENU;
         }
     }
     //绘制游戏设置界面
     void RenderOption()
     {
         GUI.skin = mySkin;
         GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),textureBG);

         //开启音乐按钮
         if(GUI.Button(new Rect (0,0,403,75),"","music_on"))
         {
             if (!music.isPlaying)
             {
                 //播放音乐
                 music.Play();
             }

         }
         //关闭音乐按钮
         if(GUI.Button(new Rect (0,200,403,75),"","music_off"))
         {
             //关闭音乐
             music.Stop();
         }
         //返回按钮
         if(GUI.Button(new Rect (0,500,403,78),"","back"))
         {
             //返回游戏主菜单
             gameState = STATE_MAINMENU;
         }
     }
 }