C++ 混合对象数组

Question

我正在通过 http://www.tonypa.pri.ee/tbw/tut02.html 阅读 tile 引擎教程但是当我将 Flash 代码翻译成 C++ 时我被卡住了。到目前为止我理解并翻译了这部分:

unsigned int MAPDATA[6][8] = {
    { 1, 1, 1, 1, 1, 1, 1, 1 },
    { 1, 0, 0, 0, 0, 0, 0, 1 },
    { 1, 0, 1, 0, 0, 0, 0, 1 },
    { 1, 0, 0, 0, 0, 1, 0, 1 },
    { 1, 0, 0, 0, 0, 0, 0, 1 },
    { 1, 1, 1, 1, 1, 1, 1, 1 }
};

class Tile0 {
    public:
        Tile0();
        bool walkable = true;
        unsigned int frame = 0;
};

class Tile1 {
    public:
        Tile1();
        bool walkable = false;
        unsigned int frame = 1;
};

但是在这条线上，它说，

"First line game.Tile0= function () {} declares new object prototype. When we get 0 from map array, we will use Tile0 as template to make new tile object on that position."

是不是说把数组MAPDATA转换成对象数组？

unsigned int MAPOBJS[6][8] = {
    { Tile1, Tile1, Tile1, Tile1, Tile1, Tile1, Tile1, Tile1 },
    { Tile1, Tile0, Tile0, Tile0, Tile0, Tile0, Tile0, Tile1 },
    { Tile1, Tile0, Tile1, Tile0, Tile0, Tile0, Tile0, Tile1 },
    { Tile1, Tile0, Tile0, Tile0, Tile0, Tile1, Tile0, Tile1 },
    { Tile1, Tile0, Tile0, Tile0, Tile0, Tile0, Tile0, Tile1 },
    { Tile1, Tile1, Tile1, Tile1, Tile1, Tile1, Tile1, Tile1 }
};

还是说用Tile0间接引用0？你如何在 C++ 上做到这一点，以便以后你可以......

if ( MAPOBJS[1][5].walkable )
    player.moveLeft();

用于合谋检测？

Answer 1

必须先阅读原始文章。嗯，我认为那里提出的建议可以用类似的东西代替(不要假装优化或其他任何东西)，但我希望它能给你一个大概的想法。

class Tile {
   public:
     enum {
        TILE0,
        TILE1
     };

     Tile(int type) : m_type(type) {};
   protected:
     int m_type;   
};

class Tile1 : public Tile {
     Tile1( Tile::TILE0 );
};

class Tile2 : public Tile {
     Tile2( Tile::TILE1 );
};

int mapData[6][8] = {
     { Tile::TILE0, Tile::TILE1, ... }, 
     { ... }
};

Tile * mapObject[6][8];


initMap() {
   for (int i=0;i<6;i++) 
     for (int j=0;j<8;j++) {
       switch (mapData[i][j]) {
           case Tile::TILE0:
              mapObect[i][j] = new Tile1();
           break;
           case Tile::TILE1:
              mapObject[i][j] = new Tile2();
           break;
           default:
              mapObject = NULL;
           break;
       }
   }
}