MyApp
.....\line.cpp
.....\line.h
.....\line.png
.....\main.cpp
.....\mainwindow.cpp
.....\mainwindow.h
.....\MyApp.pro
.....\paintwidget.cpp
.....\paintwidget.h
.....\rect.cpp
.....\rect.h
.....\rect.png
.....\res.qrc
.....\shape.cpp
.....\shape.h