QT drawing is complete, detailed and easy to understand code, I hope to help novice,

paintExample
............\paint20100206
............\.............\images
............\.............\......\clear.png
............\.............\......\exit.png
............\.............\......\help.jpg
............\.............\......\new.png
............\.............\......\open.png
............\.............\......\print.png
............\.............\......\rotate.png
............\.............\......\save.png
............\.............\......\saveas.png
............\.............\......\shear.png
............\.............\......\tool.png
............\.............\......\zoom-1.png
............\.............\......\zoom-in.png
............\.............\......\zoom-out.png
............\.............\main.cpp
............\.............\mainwindow.cpp
............\.............\mainwindow.h
............\.............\mainwindow.ui
............\.............\myResource.qrc
............\.............\paint.pro
............\.............\paint.pro.user
............\.............\paintarea.cpp
............\.............\paintarea.h
............\.............\readme.txt
............\.............\ui_mainwindow.h
............\paint20100207
............\.............\donewdialog.cpp
............\.............\donewdialog.h
............\.............\donewdialog.ui
............\.............\images
............\.............\......\clear.png
............\.............\......\exit.png
............\.............\......\help.jpg
............\.............\......\new.png
............\.............\......\open.png
............\.............\......\print.png
............\.............\......\rotate.png
............\.............\......\save.png
............\.............\......\saveas.png
............\.............\......\shear.png
............\.............\......\tool.png
............\.............\......\zoom-1.png
............\.............\......\zoom-in.png
............\.............\......\zoom-out.png
............\.............\main.cpp
............\.............\mainwindow.cpp
............\.............\mainwindow.h
............\.............\mainwindow.ui
............\.............\myResource.qrc
............\.............\paint.pro
............\.............\paint.pro.user
............\.............\paintarea.cpp
............\.............\paintarea.h
............\.............\readme.txt
............\.............\ui_donewdialog.h
............\.............\ui_mainwindow.h
............\paint20100208
............\.............\donewdialog.cpp
............\.............\donewdialog.h
............\.............\donewdialog.ui
............\.............\images
............\.............\......\clear.png
............\.............\......\exit.png
............\.............\......\help.jpg
............\.............\......\new.png
............\.............\......\open.png
............\.............\......\print.png
............\.............\......\rotate.png
............\.............\......\save.png
............\.............\......\saveas.png
............\.............\......\shear.png
............\.............\......\tool.png
............\.............\......\zoom-1.png
............\.............\......\zoom-in.png
............\.............\......\zoom-out.png
............\.............\main.cpp
............\.............\mainwindow.cpp
............\.............\mainwindow.h
............\.............\mainwindow.ui
............\.............\myResource.qrc
............\.............\paint.pro
............\.............\paint.pro.user
............\.............\paintarea.cpp
............\.............\paintarea.h
............\.............\readme.txt
............\.............\ui_donewdialog.h
............\.............\ui_mainwindow.h
............\paint20100209Finish
............\...................\donewdialog.cpp
............\...................\donewdialog.h
............\...................\donewdialog.ui
............\...................\images
............\...................\......\clear.png
............\...................\......\exit.png
............\...................\......\help.jpg
............\....

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