慢慢長大的程式 – 彈跳球 V1.2

還記得之前曾發文討論過的NXC彈跳球程式嗎？現在功能越加越多了！在 V1.2中加入了球拍可以打球，並且用NXT上的左右鍵控制球拍的位置。

（其實我的目標是寫出在NXT上跑的敲磚塊遊戲…）

以下是程式碼，歡迎大家自己試玩看看：

void DrawRacket(int p1);
void ClearRacket(int p2);
void Initialize(void);

int ball_x = 49;
int ball_y = 15;

task main()
{
       int del_x = 1;
       int del_y = 1;
       int p = 0;
       int counter = 0;
       bool leftkey;
       bool rightkey;
       Initialize();
       while(true)
       {
             leftkey = ButtonPressed(BTNLEFT,false);
             rightkey = ButtonPressed(BTNRIGHT,false);
             if( counter%3 == 0 )
             {
                     ClearScreen();
             }
             DrawRacket(41+p);
             ball_x = ball_x + del_x;
             ball_y = ball_y + del_y;
             CircleOut(ball_x,ball_y,1);
             if( ball_x <= 2 || ball_x>=96)                  // 偵測球是否打到左/右邊的牆
             {
                     del_x = del_x*-1;
                     PlayTone(440,1);
             }
              if( ball_y >= 61)                                          // 偵測球是否打到上/下邊的牆
              {
                     del_y = del_y*-1;
                    PlayTone(440,1);
              }
              if(leftkey == true)                                       // 偵測方向鍵是否壓下
              {
                     if( 41+p > 2 )
                     {
                             ClearRacket(41+p);
                             p = p-3;
                             DrawRacket(41+p);
                     }
              }
              if(rightkey == true)
             {
                     if( 41+p <= 80)
                     {
                             ClearRacket(41+p);
                             p = p+3;
                             DrawRacket(41+p);
                     }
             }
             if( ball_y == 13 )                                   // 偵測球是否打到球拍
             {
                      if( (40+p) <= ball_x && ball_x <= (57+p) )
                      {
                             del_y = del_y*-1;
                             PlayTone(440,1);
                      }
             }
            if( ball_y == 3 )                                    // 偵測球是否碰到底部
            {
                     PlayTone(330,1000);
                     Wait(2000);
                     break;
            }
        &
nbsp;   counter++;
            Wait(30);
      }
      TextOut(23,35,"Game Over!");
      Wait(3000);
      ClearScreen();
}
void Initialize(void)
{
     bool centerkey = false;
     DrawRacket(41);
     CircleOut(49,15,1);
     until( centerkey == true )
     {
           centerkey = ButtonPressed(BTNCENTER,true);
           TextOut(5,45,"Press ORNG btn");
           TextOut(5,30,"to start!");
     }
     TextOut(5,45,"                 ");
     TextOut(5,30,"                 ");
}
void DrawRacket(int p1)
{
         int y = 10;
         int w = 15;
         RectOut(p1,y,w,2);
}
void ClearRacket(int p2)
{
        for(int y=10; y>7; y–)
       {
          TextOut(p2,y,"                 ");
       }
}

實測影片：

接下來就是加磚塊了！