main.cpp 范例文件

analogclock/main.cpp
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#include <QtGui> #include "rasterwindow.h" class AnalogClockWindow : public RasterWindow { public: AnalogClockWindow(); protected: void timerEvent(QTimerEvent *) override; void render(QPainter *p) override; private: int m_timerId; }; AnalogClockWindow::AnalogClockWindow() { setTitle("Analog Clock"); resize(200, 200); m_timerId = startTimer(1000); } void AnalogClockWindow::timerEvent(QTimerEvent *event) { if (event->timerId() == m_timerId) renderLater(); } void AnalogClockWindow::render(QPainter *p) { static const QPoint hourHand[3] = { QPoint(7, 8), QPoint(-7, 8), QPoint(0, -40) }; static const QPoint minuteHand[3] = { QPoint(7, 8), QPoint(-7, 8), QPoint(0, -70) }; QColor hourColor(127, 0, 127); QColor minuteColor(0, 127, 127, 191); p->setRenderHint(QPainter::Antialiasing); p->translate(width() / 2, height() / 2); int side = qMin(width(), height()); p->scale(side / 200.0, side / 200.0); p->setPen(Qt::NoPen); p->setBrush(hourColor); QTime time = QTime::currentTime(); p->save(); p->rotate(30.0 * ((time.hour() + time.minute() / 60.0))); p->drawConvexPolygon(hourHand, 3); p->restore(); p->setPen(hourColor); for (int i = 0; i < 12; ++i) { p->drawLine(88, 0, 96, 0); p->rotate(30.0); } p->setPen(Qt::NoPen); p->setBrush(minuteColor); p->save(); p->rotate(6.0 * (time.minute() + time.second() / 60.0)); p->drawConvexPolygon(minuteHand, 3); p->restore(); p->setPen(minuteColor); for (int j = 0; j < 60; ++j) { if ((j % 5) != 0) p->drawLine(92, 0, 96, 0); p->rotate(6.0); } } int main(int argc, char **argv) { QGuiApplication app(argc, argv); AnalogClockWindow clock; clock.show(); return app.exec(); }