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/*
 * structures
 */
//C++´úÂëÇó×¢ÊÍ,ºìÉ«²¿·Ö
/*
 * DBLNODE - a node in a generic doubly-linked list
 */
typedef struct _DBLNODE
{
  struct _DBLNODE FAR *next; // link to next node
  struct _DBLNODE FAR *prev; // link to previous node
  SHORT type; // type of object
  double posx, posy; // actual x and y position
  double velx, vely; // x and y velocity (pixels/millisecond)
  double frame; // current frame
  double delay; // frame/millisecond
  RECT src, dst; // source and destination rects
  LPDIRECTDRAWSURFACE surf; // surface containing bitmap
} DBLNODE;
typedef DBLNODE FAR *LPDBLNODE;

DBLNODE DL; // Display List

//ÏÂÃæµÄ´úÂëÎÒ²»ÊǺÜÀí½â£¬ÖصãÊÇnew²»Àí½â¡£Çë¸ßÈËÖ¸½Ì¡£
void linkObject( LPDBLNODE new )
{
new->next = DL.next;
new->prev = &DL;
DL.next->prev = new;
DL.next = new;
}

void linkLastObject( LPDBLNODE new )
{
new->prev = DL.prev;
new->next = &DL;
DL.prev->next = new;
DL.prev = new;
}

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