int game_is_lost()
{
if (can_move_left(&grid) || can_move_right(&grid) ||
can_move_up(&grid) || can_move_down(&grid)) {
return 0;
} else {
return 1;
}
}
int how_far_left(OBJp objp,int n)
{
register int i;
register int temp;
temp = objp->x; /* save the current position */
/* increment the position until you can't move left any further */
for (i = 0; i < n; i++)
{
objp->x--;
if (!can_move_left(objp))
{
objp->x = temp;
return(i);
}
}
objp->x = temp; /* restore the current position */
return(n); /* return how far left */
}
void play_game()
{
board *b = &grid;
do {
switch (os_wait_for_key()) {
case ESC_KEY:
return;
case UP_KEY:
if (can_move_up(b)) {
shift_up(b);
merge_up(b);
shift_up(b);
add_big_int(&score, &merge_score);
break;
} else {
continue;
}
case DOWN_KEY:
if (can_move_down(b)) {
shift_down(b);
merge_down(b);
shift_down(b);
add_big_int(&score, &merge_score);
break;
} else {
continue;
}
case LEFT_KEY:
if (can_move_left(b)) {
shift_left(b);
merge_left(b);
shift_left(b);
add_big_int(&score, &merge_score);
break;
} else {
continue;
}
case RIGHT_KEY:
if (can_move_right(b)) {
shift_right(b);
merge_right(b);
shift_right(b);
add_big_int(&score, &merge_score);
break;
} else {
continue;
}
default:
continue;
}
add_tile(b);
display_board(b);
} while (!game_is_lost());
}
