This is the job of a software internship program, the function is given three vertices, draw a triangle and its inscribed circle, circumscribed circle, and draw a coordinate system, the legend. And the view can drag, zoom. The graphics are displayed in different colors.

SchoolWork
..........\moc_mainwindow.cpp
..........\utility.h
..........\mainwindow.h
..........\paintview.cpp
..........\SchoolWork.pro.user
..........\SchoolWork
..........\moc_paintview.cpp
..........\main.o
..........\mainwindow.cpp
..........\mainwindow.o
..........\moc_mainwindow.o
..........\Makefile
..........\SchoolWork.pro
..........\main.cpp
..........\paintview.h
..........\paintview.o
..........\moc_node.cpp

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