now mouse function is all right, start to small map.
make it easy for preparing mapwidget.
i realize the map, but the ui is so ugly. i will make it better
changePoint() function add to speed up, QFile is used to system-crossed,
now a singal point can be display
now add point, but not run correct
now the add point module is correct, start to modify map.
now the map is more beautiful, and more easy to read.
the end of this project
fix a small bug