?? 9_1.cpp
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#include <qapplication.h>#include <qwidget.h>#include <qpainter.h>class MyMainWindow:public QWidget{ public: MyMainWindow(); private: void paintEvent(QPaintEvent*); QPainter *paint;};void MyMainWindow::paintEvent(QPaintEvent*){ paint = new QPainter; paint->begin(this); paint->drawRect(20,20,160,160); paint->end();}MyMainWindow::MyMainWindow(){ setGeometry(100,100,200,200);}main(int argc,char **argv){ QApplication a(argc,argv); MyMainWindow w; a.setMainWidget(&w); w.show(); a.exec();}?? 快捷鍵說明
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