Description: A simple example, the use of QTcreator Circle, a fixed center, the radius of the circle, the center can be adjusted, and the display coordinate
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File list (Check if you may need any files):
circle
......\circle.cpp
......\circle.h
......\circle.pro
......\circle.pro.user
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
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