qt 实现钟表图标

1. #include "clock.h"
2. CLOCK::CLOCK(QWidget *parent)
3. : QWidget(parent)
4. {
5. QTimer *timer = new QTimer(this);
6. timer->start(1000);//一秒钟
7. connect(timer,SIGNAL(timeout()),this,SLOT(update()));
8. QFont font;
9. font.setPointSize(10);//字体大小设置为10
10. setFont(font);
11. }
12. CLOCK::~CLOCK()
13. {
14. }
15. void CLOCK::paintEvent(QPaintEvent * /* event */)
16. {
17. QPainter painter(this);
18. painter.setRenderHint(QPainter::Antialiasing, true);
19. int side = qMin(width(), height());
20. painter.setViewport((width() - side) / 2, (height() - side) / 2,
21. side, side);
22. painter.setWindow(0, 0, 200, 200);/*设置(0，0)为新的坐标原点*/
23. draw(&painter);
24. }
25. void CLOCK::draw(QPainter *painter)
26. {
27. QPen thickPen(palette().foreground(), 1.5);//设置刻度线为粗黑
28. QPen thinPen(palette().foreground(), 0.5);//设置刻度线为灰
29. QTime time = QTime::currentTime();
30. painter->translate(100,100);//重新设定坐标原点
31. painter->setRenderHint(QPainter::Antialiasing);//消锯齿
32. painter->setBrush(Qt::red);
33. painter->setPen(Qt::red);
34. painter->save();//保存坐标系，防止坐标系跑偏了
35. painter->rotate(6.0*time.second());//注意是6.0，不是6
36. painter->drawConvexPolygon(sed,4);
37. painter->restore();//复位之前的坐标系
38. painter->setBrush(Qt::blue);
39. painter->setPen(Qt::blue);
40. painter->save();
41. painter->rotate(6.0*(time.minute()+time.second()/60.0));
42. painter->drawConvexPolygon(min,4);
43. painter->restore();
44. painter->setBrush(Qt::black);
45. painter->setPen(Qt::black);
46. painter->save();
47. painter->rotate(30.0*(time.hour()+time.minute()/60.0));
48. painter->drawConvexPolygon(hour,4);
49. painter->restore();
50. // //painter->drawLine(0,-98,0,-88);
51. // for(int i=0;i<12;i++)
52. // {
53. // painter->rotate(30);//坐标轴旋转30度
54. // painter->drawLine(0,-98,0,-88);
55. // }
56. /*画刻度还有数字*/
57. for (int i = 1; i <=60; ++i) {
58. painter->save();
59. painter->rotate(6*i);//坐标轴旋转6度
60. if (i % 5 == 0) {
61. painter->setPen(thickPen);
62. painter->drawLine(0, -98, 0, -82);
63. painter->drawText(-20, -82, 40, 40,
64. Qt::AlignHCenter | Qt::AlignTop,
65. QString::number(i/5));
66. } else {
67. painter->setPen(thinPen);
68. painter->drawLine(0, -98, 0, -88);
69. }
70. //painter->rotate(-DegreesPerMinute);
71. painter->restore();
72. }
73. }