PSTARTY
PSTARTY(pan), PSTARTX(pan));
PSTARTY(pan1) > PENDY(pan2) || PENDY(pan1) < PSTARTY(pan2) ||\
iy1 = (PSTARTY(pan1) < PSTARTY(pan2)) ? PSTARTY(pan2) : PSTARTY(pan1);\
if (is_linetouched(pan->win,y - PSTARTY(pan))) {\
struct ldat* line = &(pan2->win->_line[y - PSTARTY(pan2)]);\