15-03-16 GUID画验证码

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GDI+就是用来画图的;炒股软件，心电图等都是GDI画的，GDI不是.net的技术，他是一个单独的技术

  private void Form1_Load(object sender, EventArgs e)
        {
            //画图需要一根笔，颜色 一张纸，两点，绘制直线的对象
            //纸就是窗体，绘制直线的对象就是GDI对象
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //创建GDI对象;
            Graphics g = this.CreateGraphics();//通过this当前窗体创建对象//new Graphics();
            //创建画笔对象
            Pen pen = new Pen(Brushes.YellowGreen);
            //创建两个点
            Point p1 = new Point(30, 50);
            Point p2 = new Point(250, 250);
            g.DrawLine(pen, p1, p2);

            //当我们把窗体从一个地方移动到另外一个地方的时候,操作系统把原来那个擦掉了，重新画了一个新的;
            //当我们画了线的窗体拖出窗体的时候，窗体会被操作系统重新画一遍，但是直线不会被操作系重新画一遍，因此直线会消失
 
        }

        int i = 0;
        private void Form1_Paint(object sender, PaintEventArgs e) //重绘窗体的时候执行的事件;
        {
            i++;
            label1.Text = i.ToString(); //记录被重绘的次数；
            //创建GDI对象;
            Graphics g = this.CreateGraphics();//通过this当前窗体创建对象//new Graphics();
            //创建画笔对象
            Pen pen = new Pen(Brushes.YellowGreen);
            //创建两个点
            Point p1 = new Point(30, 50);
            Point p2 = new Point(250, 250);
            g.DrawLine(pen, p1, p2);

        }

//要看方法重载的参数，方法名后面打办个括号，按上下方向键;

  private void button2_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen pen = new Pen(Brushes.Red);
            Size size = new Size(80,80);
            Rectangle rec = new Rectangle(new Point(50,50),size);
            g.DrawRectangle(pen, rec);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen pen = new Pen(Brushes.Blue);
            Size size = new Size(180,180);
            Rectangle rec = new Rectangle(new Point(150,150),size);
            g.DrawPie(pen, rec, 60, 60);

        }

        private void button4_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            g.DrawString("美丽可爱的球球", new Font("宋体", 20, FontStyle.Underline), Brushes.Gold, new Point(300, 300));

        }

系统里面的图像默认是位图;

--------画验证码;
 private void pictureBox1_Click(object sender, EventArgs e)
        {
            Random r = new Random();
            string str = null;
            for (int i = 0; i < 5; i++)
            {
                int rnum = r.Next(0, 10);
                str += rnum;
            }
            //创建GDI对象;
            Bitmap bmp = new Bitmap(120,40);
            Graphics g = Graphics.FromImage(bmp); //在bmp上画

            for (int i = 0; i < 5; i++)
            {
                string[] font = {"微软雅黑","宋体","黑体","隶书","仿宋"};
                Color[] color = {Color.Red,Color.Yellow,Color.Blue,Color.Green,Color.Pink,Color.Purple,Color.Black,Color.Chocolate};
                //new SolidBrush单色画笔，参数传Color,最后一个参数点的坐标不能随机给，随机给会重叠
                Point p = new Point(i*15,0); //这个点坐标不是相对于窗体，而是bitmap;
                g.DrawString(str[i].ToString(),new Font(font[r.Next(0,5)],30,FontStyle.Bold),new SolidBrush(color[r.Next(0,8)]),p);
               
            }

            //给图像画上干扰线;
            for (int i = 0; i < 30; i++)
            {
                //直线的点的坐标必须在bmp里面
                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);
            }

            //画像素颗粒就不用GDI了，而是直接设置bmp像素的颜色;
            for (int i = 0; i < 1000; i++)
            {
                //点的坐标必须在bmp里面
                Point p = new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));
                //指定图片中像素颜色
                bmp.SetPixel(p.X, p.Y, Color.DarkOliveGreen);
            }
           
            //将图片镶嵌到picturebox中，
            pictureBox1.Image = bmp;

        }
        //第一步产生随机数;第二步画字符串，第三步画线，第四步画点;

15-03-16 GUID画验证码

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原文地址：http://www.cnblogs.com/hhsfrank/p/4342915.html