贪吃蛇源程序

贪吃蛇源程序(18) /* function:judge if the sanke can eat food.the method like */
/*    this:provided that the snake move a step based  */
/*   on its next move direction,and if this place    */
/*   have food,then the snake can eat food.   */
int willeatfood()
{
 /* 1 means will eat food ,and 0 means won't eat food */

 int tempx,tempy;

 switch(snake_head.next_move)
 {
  case MOVE_UP:
   tempx = snake_head.posx;
   tempy = snake_head.posy - SCALE;
   break;
  case MOVE_LEFT:
   tempx = snake_head.posx - SCALE;
   tempy = snake_head.posy;
   break;
  case MOVE_DOWN:
   tempx = snake_head.posx;
   tempy = snake_head.posy + SCALE;
   break;
  case MOVE_RIGHT:
   tempx = snake_head.posx + SCALE;
   tempy = snake_head.posy;
   break;
  default:
   break;
 }

 if(getpixel(tempx,tempy) == FOOD_COLOR)
  return 1;

 return 0;

}

/* sub function: addonefood()       */
/* function: this function will lengthen the snake body */
/*    this function is important because it will */
/*    not only locate memory for new snake body, */
/*    but also handle the relationship of pointer*/
/*    between the new snake body and its previous*/
/*    snake body.        

*/
void addonefood()
{
 FOOD_INFOR_PTR traceon;

 snake_head.eatenC ++ ;
 traceon = snake_head.next;

 if(snake_head.next == NULL)  /* haven't eaten any food */