BOX_L
(void) move(BOX_T, BOX_L);
(void) move(BOX_B, BOX_L);
(void) mvaddch(n, BOX_L, '|');
(void) mvaddch(BOX_T, BOX_L, '+');
(void) mvaddch(BOX_B, BOX_L, '+');
#define BOX_R (BOX_L+BOX_X-1)
#define TURN_L ((BOX_L+BOX_R-TURN_X)/2)
#define VIEW_L (BOX_L+1)