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50
51#include <QtGui>
52
53#include "rasterwindow.h"
54
55//! [5]
56class AnalogClockWindow : public RasterWindow
57{
58public:
59 AnalogClockWindow();
60
61protected:
62 void timerEvent(QTimerEvent *) override;
63 void render(QPainter *p) override;
64
65private:
66 int m_timerId;
67};
68//! [5]
69
70
71//! [6]
72AnalogClockWindow::AnalogClockWindow()
73{
74 setTitle("Analog Clock");
75 resize(w: 200, h: 200);
76
77 m_timerId = startTimer(interval: 1000);
78}
79//! [6]
80
81//! [7]
82void AnalogClockWindow::timerEvent(QTimerEvent *event)
83{
84 if (event->timerId() == m_timerId)
85 renderLater();
86}
87//! [7]
88
89//! [1] //! [14]
90void AnalogClockWindow::render(QPainter *p)
91{
92//! [14]
93//! [8]
94 static const QPoint hourHand[3] = {
95 QPoint(7, 8),
96 QPoint(-7, 8),
97 QPoint(0, -40)
98 };
99 static const QPoint minuteHand[3] = {
100 QPoint(7, 8),
101 QPoint(-7, 8),
102 QPoint(0, -70)
103 };
104
105 QColor hourColor(127, 0, 127);
106 QColor minuteColor(0, 127, 127, 191);
107//! [8]
108
109//! [9]
110 p->setRenderHint(hint: QPainter::Antialiasing);
111//! [9] //! [10]
112 p->translate(dx: width() / 2, dy: height() / 2);
113
114 int side = qMin(a: width(), b: height());
115 p->scale(sx: side / 200.0, sy: side / 200.0);
116//! [1] //! [10]
117
118//! [11]
119 p->setPen(Qt::NoPen);
120 p->setBrush(hourColor);
121//! [11]
122
123//! [2]
124 QTime time = QTime::currentTime();
125
126 p->save();
127 p->rotate(a: 30.0 * ((time.hour() + time.minute() / 60.0)));
128 p->drawConvexPolygon(points: hourHand, pointCount: 3);
129 p->restore();
130//! [2]
131
132//! [12]
133 p->setPen(hourColor);
134
135 for (int i = 0; i < 12; ++i) {
136 p->drawLine(x1: 88, y1: 0, x2: 96, y2: 0);
137 p->rotate(a: 30.0);
138 }
139//! [12] //! [13]
140 p->setPen(Qt::NoPen);
141 p->setBrush(minuteColor);
142//! [13]
143
144//! [3]
145 p->save();
146 p->rotate(a: 6.0 * (time.minute() + time.second() / 60.0));
147 p->drawConvexPolygon(points: minuteHand, pointCount: 3);
148 p->restore();
149//! [3]
150
151//! [4]
152 p->setPen(minuteColor);
153
154 for (int j = 0; j < 60; ++j) {
155 if ((j % 5) != 0)
156 p->drawLine(x1: 92, y1: 0, x2: 96, y2: 0);
157 p->rotate(a: 6.0);
158 }
159//! [4]
160}
161
162int main(int argc, char **argv)
163{
164 QGuiApplication app(argc, argv);
165
166 AnalogClockWindow clock;
167 clock.show();
168
169 return app.exec();
170}
171

source code of qtbase/examples/gui/analogclock/main.cpp