1 /// <summary>
2 /// 单击更换验证码
3 /// </summary>
4 /// <param name="sender"></param>
5 /// <param name="e"></param>
6 private void pictureBox1_Click(object sender, EventArgs e)
7 {
8 //1,生产随机对象Random,生成随机数和验证码
9 Random r = new Random();
10 //随机产生验证码字符
11 string str = null;
12 for (int i = 0; i < 5; i++)
13 {
14 str += r.Next(0, 10).ToString();
15 }
16 //MessageBox.Show(str);
17
18 //创建GDI对象
19 Bitmap bmp = new Bitmap(120, 40); //创建位图
20 Graphics g = Graphics.FromImage(bmp); //创建GDI
21 //颜色
22 Color[] cs = { Color.Red, Color.Blue, Color.Black, Color.BlueViolet, Color.Green, Color.DarkRed };
23
24 //绘制验证码文本字符串
25 for (int i = 0; i < 5; i++)
26 {
27 //绘制字体
28 string[] typeface = { "微软雅黑", "黑体", "宋体", "仿宋", "隶书", "楷书" };
29 Font font = new Font(typeface[r.Next(0, 6)], 20, FontStyle.Bold);
30 //颜色
31 //Color[] cs = { Color.Red, Color.Blue,Color.LightGray,Color.Gray,Color.Green,Color.GhostWhite };
32 g.DrawString(str[i].ToString(), font, new SolidBrush(cs[r.Next(0, 6)]), new Point(i * 20, 0));
33 }
34
35 //绘制干扰线 ,画直线
36 for (int i = 0; i < 30; i++)
37 {
38
39 Pen pen = new Pen(cs[r.Next(0, 3)], 1);//画笔
40 Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
41 Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
42 g.DrawLine(pen, p1, p2);
43
44 }
45
46 //设置像素点颜色
47 for (int i = 0; i < 500; i++)
48 {
49 bmp.SetPixel(r.Next(0, bmp.Width), r.Next(0, bmp.Height),Color.Black);
50 }
51
52 //将绘制图片嵌入pictureBox中
53 pictureBox1.Image = bmp;
54
55
56 }
