Create Random Code Image - CSharp System

CSharp examples for System:Random

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Description

Create Random Code Image

Demo Code


using System.Web;
using System.Linq;
using System.Drawing;
using System.Collections.Generic;
using System;/*from  www .  ja va 2s .  com*/

public class Main{
        public static byte[] CreateRandomCodeImage(string randomcode)
        {
            int randAngle = 45;
            int mapwidth = (int)(randomcode.Length * 23);
            Bitmap map = new Bitmap(mapwidth, 32);
            Graphics graph = Graphics.FromImage(map);
            graph.Clear(Color.AliceBlue);
            graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - 1, map.Height - 1);
            Random rand = new Random();
            Pen blackPen = new Pen(Color.LightGray, 0);
            for (int i = 0; i < 50; i++)
            {
                int x = rand.Next(0, map.Width);
                int y = rand.Next(0, map.Height);
                graph.DrawRectangle(blackPen, x, y, 1, 1);
            }
            char[] chars = randomcode.ToCharArray();
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            format.Alignment = StringAlignment.Center;
            format.LineAlignment = StringAlignment.Center;
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "??" };
            for (int i = 0; i < chars.Length; i++)
            {
                int cindex = rand.Next(7);
                int findex = rand.Next(5);
                Font f = new System.Drawing.Font(font[findex], 16, System.Drawing.FontStyle.Bold);
                Brush b = new System.Drawing.SolidBrush(c[cindex]);
                Point dot = new Point(16, 16);
                float angle = rand.Next(-randAngle, randAngle); 
                graph.TranslateTransform(dot.X, dot.Y);
                graph.RotateTransform(angle);
                graph.DrawString(chars[i].ToString(), f, b, 1, 1, format);
                graph.RotateTransform(-angle);
                graph.TranslateTransform(2, -dot.Y);
            }
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            graph.Dispose();
            map.Dispose();
            return ms.ToArray();
        }
}

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