winform 显示时钟效果

1 usingSystem;
2 usingSystem.Drawing;
3 usingSystem.Windows.Forms;
4 usingSystem.Drawing.Drawing2D;
5 
6 namespaceVH_CriticalReport.userControl
7 {
8     public partial classClockControl : UserControl
9 {
10         const int screenWidth = 150; //屏幕宽度
11         const int screenHeight = 150; //屏幕高度
12 
13         publicClockControl()
14 {
15 InitializeComponent();
16 
17             this.Width = screenWidth + 1;
18             this.Height = screenHeight + 1;
19             this.DoubleBuffered = true; //控件缓冲，避免闪烁
20             this.SetStyle(ControlStyles.ResizeRedraw, true);
21 clockTimer.Start();
22 
23 }
24 
25         private void clockTimer_Tick(objectsender, EventArgs e)
26 {
27 Invalidate();
28 }
29 
30         protected override voidOnPaint(PaintEventArgs e)
31 {
32             DateTime dtNow =DateTime.Now;
33             string dayOfWeek = dtNow.ToString("dddd", new System.Globalization.CultureInfo("zh-cn"));//星期几
34             Brush brush = new SolidBrush(Color.Black); //填充图形
35             Pen pen = new Pen(Color.Black); //画笔
36             Font hourFont = new Font("Arial", 10, FontStyle.Bold);//时钟数字的字体
37             Font dateFont = new Font("Arial", 6); //日期的字体
38             int dialRadius = Math.Min(screenWidth, screenHeight) / 2; //圆的半径
39 
40             Graphics g =e.Graphics;
41             g.SmoothingMode =SmoothingMode.HighQuality;
42 
43             //默认坐标系统原点是左上角，现在把原点移到屏幕中心, 右下左上对应的轴：x,y,-x,-y
44 g.TranslateTransform(dialRadius, dialRadius);
45 
46             //画时钟最外层的圆线(pen,x,y,width,height)
47             //圆的中心点坐标计算：(width/2+x,height/2+y),据此可得出要使圆在坐标原点(0,0)的x,y坐标值           
48             g.DrawEllipse(pen, -screenWidth / 2, -dialRadius, screenWidth, screenHeight);
49 
50             GraphicsState state =g.Save();
51             //画矩形、日期、星期几       
52             int rectWidth = 70;
53             int rectHeight = 30;
54             g.DrawRectangle(pen, -rectWidth / 2, rectHeight, rectWidth, rectHeight);
55             g.DrawString(dtNow.ToString("yyyy-MM-dd"), dateFont, brush, -rectWidth / 2, rectHeight + 2);
56             g.DrawString(dayOfWeek.PadLeft(8, ' '), dateFont, brush, -rectWidth / 2, rectHeight + 15);
57 g.Restore(state);
58 
59             //画时钟的60个圆点
60             //Save(),Restore(state)配合使用，使得平移、缩放、旋转等操作只对它们作用域之间的代码有效，
61             //save开始到restore之间这绘画，就像有绘制了一个图层，restore之后将两个图层放到一起
62             state =g.Save();
63             for (int i = 0; i < 60; i++)
64 {
65                 int w = i % 5 == 0 ? 5 : 3;
66                 g.FillEllipse(brush, 0, -dialRadius, w, w);
67                 //围绕指定点按照顺时针方向旋转角度360 / 60 = 6度
68                 g.RotateTransform(6);
69 }
70 g.Restore(state);
71 
72             //画时钟的12个数字，如果用上面RotateTransform方法则数字会倾斜、倒立，故不用
73             state =g.Save();
74             for (int i = 0; i < 12; i++)
75 {
76                 //已知圆中心占坐标(x0,y0),半径r，角度a0,则圆上任一点坐标（x,y）计算：
77                 //x = x0 + r * cos(ao * 3.14 /180) 
78                 //y = y0 + r * sin(ao * 3.14 /180) 
79                 Point point = new Point(-6, -6); //当为(0,0)时全部数字偏右下移，故手动调整
80                 double dd = Math.PI / 180 * i * (360 / 12); //每次转360/12度
81                 float x = point.X + (float)((dialRadius - 12) *Math.Cos(dd));
82                 float y = point.Y + (float)((dialRadius - 12) *Math.Sin(dd));
83 
84                 //因为是从顺时钟3点钟开始画，所以索引i需要加上3
85                 int j = i + 3;
86                 if (j > 12)
87                     j = j - 12;
88 g.DrawString(j.ToString(), hourFont, brush, x, y);
89 }
90 g.Restore(state);
91 
92             //画时钟的图形
93             state =g.Save();
94             g.RotateTransform((dtNow.Hour - 12 + dtNow.Minute / 60f) * 360f /12f);
95             //时钟指针默认指向12点钟方向,分钟指针也一样
96             g.DrawPolygon(new Pen(brush), newPoint[]
97 {
98                 new Point(0,  20), new Point( 10, 0),
99                 new Point(0, -60), new Point(-10, 0)
100                 
101 });
102 g.Restore(state);
103 
104             //画分钟的图形
105             state =g.Save();
106             g.RotateTransform((dtNow.Minute + dtNow.Second / 60f) * 360f /60f);
107             g.DrawPolygon(new Pen(brush), newPoint[]
108 {
109                 new Point(0,  20), new Point( 6, 0),
110                 new Point(0, -80), new Point(-6, 0)
111                
112 });
113 g.Restore(state);
114 
115             //画秒钟的图形
116             state =g.Save();
117             g.RotateTransform(dtNow.Second * 360f /60f);
118             g.FillRectangle(brush, -1, -dialRadius + 10, 2, dialRadius);
119 g.Restore(state);
120 }
121 
122 
123 
124 }
125 }