1, Qt draw sine curve 2, achieve drag effect 3, achieve amplification and contraction 4, the realization of cross-border rendering problems

PaintSignal\debug
PaintSignal\debug\main.obj
PaintSignal\debug\mainwindow.obj
PaintSignal\debug\moc_mainwindow.cpp
PaintSignal\debug\moc_mainwindow.obj
PaintSignal\debug\PaintSignal.exe
PaintSignal\debug\PaintSignal.ilk
PaintSignal\debug\paintsignal.pdb
PaintSignal\main.cpp
PaintSignal\mainwindow.cpp
PaintSignal\mainwindow.h
PaintSignal\mainwindow.ui
PaintSignal\Makefile
PaintSignal\Makefile.Debug
PaintSignal\Makefile.Release
PaintSignal\PaintSignal.pro
PaintSignal\PaintSignal.pro.user
PaintSignal\PaintSignal.pro.user.3.2-pre1
PaintSignal\release
PaintSignal\ui_mainwindow.h

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