使用GDI繪製驗證碼

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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 使用GDI繪製驗證碼B{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        /// <summary>        /// 點擊更換驗證碼        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void pictureBox1_Click(object sender, EventArgs e)        {            Random r = new Random();            string str = null;//隨機數字串            for (int i = 0; i < 5; i++)            {                int rNumber = r.Next(0, 10);                str += rNumber;            }                       //建立GDI對象            Bitmap bmp = new Bitmap(150,40);            Graphics g = Graphics.FromImage(bmp);            for (int i = 0; i < 5; i++)            {                Point p = new Point(i*20,0); //每個數字橫座標要有間隔                string[] fonts = {"微軟雅黑","宋體","黑體","仿宋","新宋體"};                Color[] colors = {Color.Black,Color.Blue,Color.Pink,Color.Red,Color.Yellow};                g.DrawString(str[i].ToString(),new Font(fonts[r.Next(0,5)],20,FontStyle.Bold),new SolidBrush(colors[r.Next(0,5)]),p);            }            for (int i = 0; i < 20; i++)             {                Point p1 = new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));                Point p2 = new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));                g.DrawLine(new Pen(Brushes.Green),p1,p2);            }            for (int i = 0; i < 500; i++)            {                Point p = new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));                bmp.SetPixel(p.X, p.Y, Color.Black);            }            //將圖片鑲嵌到PictureBox中            pictureBox1.Image = bmp;        }    }}

 

使用GDI繪製驗證碼