? ?????? ???? ????? ?????????? ?? ?????????? ??? ??????????? ?????????? ???? ??? ????? ?? ???????????? ???? ??????? ????.?????????? ??????? ?????????? (?????? ??????, ????????? ??? ???????????? ??????, ????????? ?????, ????????? ?????????? ?????, ???????????? ?.?.)Supplemental functions – we allow for users to change cursor colour and measurement