TrainSign.Common/JsStringCommon/CreateImage.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Drawing;

namespace Common
{

    public class CreateImage
    {
        public CreateImage()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        public static void DrawImage()
        {
            CreateImage img = new CreateImage();
            HttpContext.Current.Session["CheckCode"] = img.RndNum(4);
            img.CreateImages(HttpContext.Current.Session["CheckCode"].ToString());
        }
        /// <summary>
        /// 生成验证图片
        /// </summary>
        /// <param name="checkCode">验证字符</param>
        private void CreateImages(string checkCode)
        {
            int iwidth = (int)(checkCode.Length * 13);
            int ihidth = (int)(checkCode.Length);
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22);
            Graphics g = Graphics.FromImage(image);
            g.Clear(Color.White);
            //定义颜色
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            //定义字体 
            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "黑体", "Arial", "宋体" };
            Random rand = new Random();
            //随机输出噪点
            for (int i = 0; i < 50; i++)
            {
                int x = rand.Next(image.Width);
                int y = rand.Next(image.Height);
                g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
            }

            //输出不同字体和颜色的验证码字符
            for (int i = 0; i < checkCode.Length; i++)
            {
                int cindex = rand.Next(7);
                int findex = rand.Next(5);

                Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold);
                Brush b = new System.Drawing.SolidBrush(c[cindex]);
                int ii = 4;
                if ((i + 1) % 2 == 0)
                {
                    ii = 2;
                }