本文实例为大家分享了C#实现网页画图的具体代码，供大家参考，具体内容如下

代码贴着保存下

using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging; public partial class _Default : System.Web.UI.Page{ int h = 1000; int w = 1000; protected void Page_Load(object sender, EventArgs e) { Bitmap img = new Bitmap(h, w);//创建Bitmap对象 MemoryStream stream = draw(); img.Save(stream, ImageFormat.Jpeg); //保存绘制的图片 Response.Clear(); Response.ContentType = "image/jpeg"; Response.BinaryWrite(stream.ToArray()); } public MemoryStream draw() { string[] Words = {"壹","贰","叁","肆","伍","陆"}; Bitmap img = new Bitmap(h, w);//创建Bitmap对象 Graphics g = Graphics.FromImage(img);//创建Graphics对象 g.DrawRectangle(new Pen(Color.White, img.Height), 2, 2, img.Width - 2, img.Height - 2); //矩形 底色 ArrayList coordinate = getXY(Words.Length,img.Height,img.Width); ArrayList Radius = new ArrayList(); var R = new Random(); Color Mycolor = Color.FromArgb(R.Next(100, 150), R.Next(255), R.Next(255), R.Next(255)); Font font = new Font("Arial", 20);// 字体 LinearGradientBrush font_brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Black, Color.Black, 1.2F, true); int j = 0; //画圆 写字 foreach (Point p in coordinate) { int r = R.Next(20, 40); Radius.Add(r); SolidBrush bush = new SolidBrush(Mycolor); g.FillEllipse(bush, p.X - r, p.Y - r, 2*r, 2*r);//画填充椭圆的方法，x坐标、y坐标、宽、高： g.DrawString(Words[j++], font, font_brush, p); // 标记 } //连线 var penColor = Color.FromArgb(140, R.Next(255), R.Next(255), R.Next(255)); for (int i = 1; i < coordinate.Count; i++) { Pen pen = new Pen(penColor, 2); g.DrawLine(pen, (Point)coordinate[0], (Point)coordinate[i]); } MemoryStream stream = new MemoryStream(); //保存绘制的图片 img.Save(stream, ImageFormat.Jpeg); //保存绘制的图片 return stream; } private ArrayList getXY(int len, int h, int w) { ArrayList al = new ArrayList(); double d = 50.0; var R = new Random(); int h1 = (int)(0.1 * h); int h2 = (int)(0.9 * h); int w1 = (int)(0.1 * w); int w2 = (int)(0.9 * w); while (al.Count < len) { Point p = new Point(R.Next(h1,h2), R.Next(w1,w2)); bool Add = true; foreach (Point q in al) { if (Dist(p, q) < d) { Add = false; break; } } if (Add) al.Add(p); } return al; } private double Dist(Point p1,Point p2) { return Math.Sqrt(Math.Abs(p1.X - p2.X) * Math.Abs(p1.X - p2.X) + Math.Abs(p1.Y - p2.Y) * Math.Abs(p1.Y - p2.Y)); }}

效果如下

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。