/// <summary>
/// 验证码
/// </summary>
/// <param name="width">图片宽度</param>
/// <param name="height">图片高度</param>
/// <param name="top">内容距离顶部边框距离</param>
/// <param name="left">内容距离左边框距离</param>
/// <param name="length">验证码字符个数</param>
/// <param name="rank">糙级</param>
/// <param name="size">字体大小</param>
/// <param name="code">验证码类型</param>
/// <param name="cookieName">存入cookie</param>
public static void DrawImage(int width, int height, int top, int left, int length, int rank, int size, SetOut code, string cookieName)
{
var img = new Bitmap(width, height);
var g = Graphics.FromImage(img);
g.Clear(Color.White);
Color[] color = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.LightSlateGray };
string[] fontFamily = { "Verdana", "Microsoft Sans Serif", "Arial", "宋体", "Geneva", "sans-serif Georgia", "Times New Roman", "Times", "serif", "Book Antiqua", "Palatino" };
FontStyle[] fontStyle = { FontStyle.Bold, FontStyle.Italic, FontStyle.Regular };//, FontStyle.Strikeout, FontStyle.Underline
var r = new Random();
for (var i = 0; i < rank; i++)//画随机线条
{
var x1 = r.Next(img.Width);
var x2 = r.Next(img.Width);
var y1 = r.Next(img.Height);
var y2 = r.Next(img.Height);
g.DrawLine(new Pen(color[r.Next(color.Length)], 1), x1, y1, x2, y2);
}
var character = string.Empty;
switch (code)
{
case SetOut.Number:
character = RandomCode.Number(length);
break;
case SetOut.Character:
character = RandomCode.Character(length);
break;
case SetOut.CharacterAndNumber:
character = RandomCode.CharacterAndNumber(length);
break;
default:
break;
}
if (character.Length > 0)
{
//var cookie = new HttpCookie(cookieName) { Value = character };
//HttpContext.Current.Response.Cookies.Add(cookie);
HttpContext.Current.Session["ValidateCode"] = character;
}
for (var j = 0; j < length; j++)//画验证码
{
try
{
var f = new Font(fontFamily[r.Next(fontFamily.Length)], size, fontStyle[r.Next(fontStyle.Length)]);
Brush b = new SolidBrush(color[r.Next(color.Length)]);
g.DrawString(character.Substring(j, 1), f, b, new PointF(size * j + left, top - 2));
}
catch (Exception ex)
{
HttpContext.Current.Response.Write(ex.Message);
FileObj.WriteFile(HttpContext.Current.Server.MapPath("~/log/log.txt"), ex.Message);
}
}
g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, img.Width - 1, img.Height - 1);//画验证码边框
img.Save(HttpContext.Current.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}