In the man-machine interactive QT draw polygons, you can dynamically add and delete individual vertices can also drag the vertex to the desired position.

Paint_2D
........\debug
........\.....\HCI_Paint_2D.exe
........\.....\main.o
........\.....\mainwindow.o
........\.....\moc_mainwindow.cpp
........\.....\moc_mainwindow.o
........\.....\paintarea.o
........\main.cpp
........\mainwindow.cpp
........\mainwindow.h
........\mainwindow.ui
........\Makefile
........\Makefile.Debug
........\Makefile.Release
........\paintarea.cpp
........\paintarea.h
........\Paint_2D.pro
........\Paint_2D.pro.user
........\release
........\rightitem.cpp
........\rightitem.h
........\ui_mainwindow.h

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