.Net验证码实现基础--Draw
命名空间
using System.Draw;
using System.Draw.Drawing2D;
在form等控件的 事件中 添加 paint事件
///////画各种形状(空心)///////
e.Graphics.Clear(Color.AliceBlue);//清楚整个绘画面并以制定的颜色(这里是爱丽丝蓝--Color.AliceBlue)填充
e.Graphics.DrawArc();//画弧线
e.Graphics.DrawCurve();//不闭合曲线
e.Graphics.DrawClosedCurve();//闭合的曲线
e.Graphics.DrawEllipse(pen, 80, 80, 150, 150);//画一个椭圆--如果宽和高相等则是一个正圆
Image img = Image.FromFile("clumsy-smurf-icon.png");//通过图片名称获得图片
e.Graphics.DrawImage(img,20,20);//画图片
e.Graphics.DrawRectangle();//画矩形
//画文字
string s = "红鲤鱼与绿鲤鱼与驴";
Font font = new System.Drawing.Font("隶书",18);
SolidBrush brush = new SolidBrush(Color.Cyan);
e.Graphics.DrawString(s, font, brush,200,50);
//画渐变色文字
string s = "红鲤鱼与绿鲤鱼与驴";
Font font = new System.Drawing.Font("隶书",18);
SolidBrush brush1 = new SolidBrush(Color.Cyan);//常规颜色
Point point1 = new Point(0,0);//起始点1与点2之间距离越近变换的越频繁
Point point2 = new Point(20,40);
LinearGradientBrush brush2 = new LinearGradientBrush(point1, point2, Color.DarkCyan, Color.DeepPink);//渐变色
e.Graphics.DrawString(s, font, brush2,200,50);
实例:验证码
1 private void pictureBox1_Paint(object sender, PaintEventArgs e)//装验证码的picturebox 2 { 3 _IdentifyingCode = ""; 4 string str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQISTUVWXYZ0123456789"; 5 Random rand = new Random(); 6 for (int i = 0; i < 4; i++)//截取四位验证码 7 { 8 int start = rand.Next(str.Length); 9 string s = str.Substring(start, 1); 10 _IdentifyingCode += s; 11 } 12 //渐变色 13 Point startpoint = new Point(0, 0); 14 Point endpoint = new Point(80, 45); 15 LinearGradientBrush brush = new LinearGradientBrush(startpoint, endpoint, Color.LightGreen, Color.Yellow); 16 //SolidBrush brush = new System.Drawing.SolidBrush(Color.Chocolate);//实线 17 Font font = new System.Drawing.Font("Buxton Sketch",16); 18 e.Graphics.DrawString(_IdentifyingCode, font, brush, 5, 12); 19 }
////////画各种形状(实心)///////
同画空心图形把代码中的Draw改为Fill,如:e.Graphics.FillPie();//画一个实心扇形
