仿苹果AppStore 下载进度条

 1 using System.Drawing;
 2 using System.Windows.Forms;
 3 using System.ComponentModel;
 4 namespace test
 5 {
 6     public class CircleProgressBar : Control
 7     {
 8         float _progress = 0F;
 9         float _Wpen = 1;
10         float _Npen = 5;
11         float _Fwidth = 10;
12         [Description("进度条颜色")]
13         public Color CircleColor
14         {
15             get;
16             set;
17         }
18         [Description("外圈粗度")]
19         public float WpenThin
20         {
21             get { return _Wpen; }
22             set { _Wpen = value; }
23         }
24         [Description("内圈粗度")]
25         public float NpenThin
26         {
27             get { return _Npen; }
28             set { _Npen = value; }
29         }
30         [Description("内心方形边长")]
31         public float Fwitdh
32         {
33             get { return _Fwidth; }
34             set { _Fwidth = value; }
35         }
36         public void PaintProgress(PaintEventArgs e)
37         {
38             float x = this.Width / 2;
39             float y = this.Height / 2;//圆心坐标
40             float Wr = x - WpenThin / 2;//外圈半径
41             float Nr = x - NpenThin / 2;//内圈半径
42             int Wx = (int)(x - Wr);
43             int Wy = (int)(y - Wr);//外圈起始坐标
44             int Nx = (int)(x - Nr);
45             int Ny = (int)(y - Nr);//外圈起始坐标
46             int Fy = (int)(y - Fwitdh/2);
47             int Fx = (int)(x - Fwitdh/2);// 内心方形坐标
48             Graphics dc = this.CreateGraphics();
49             dc.Clear(this.BackColor);
50             Pen Wpen = new Pen(CircleColor, WpenThin);
51             Pen Npen = new Pen(CircleColor, NpenThin);
52             Brush Fbrush = new SolidBrush(CircleColor);
53             dc.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
54             float startAngle = -90;
55             float sweepAngle = Progress / 100 * 360;//起始角度
56             Rectangle Wrec = new Rectangle(Wx, Wy, 2 * (int)Wr, 2 * (int)Wr);
57             Rectangle Nrec = new Rectangle(Nx, Ny, 2 * (int)Nr, 2 * (int)Nr);
58             Rectangle Frec = new Rectangle(Fx, Fy, (int)Fwitdh, (int)Fwitdh);
59             dc.DrawEllipse(Wpen, Wrec);
60             dc.FillRectangle(Fbrush, Frec);
61             dc.DrawArc(Npen, Nrec, startAngle, sweepAngle);
62         }
63         public float Progress
64         {
65             get { return _progress; }
66             set
67             {
68                 if (_progress != value && value >= 0 && value <= 100)
69                 {
70                     _progress = value;
71                     OnProgressChanged();
72                 }
73             }
74         }
75         protected virtual void OnProgressChanged()
76         {
77             this.Invalidate();
78         }
79         protected override void OnPaint(PaintEventArgs e)
80         {
81             PaintProgress(e);
82             base.OnPaint(e);
83         }
84     }
85 }