asp.net C#绘制太极图

成品图：

html页面：

注意设置

 ContentType="Image/Jpeg"

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TaiJiTu.aspx.cs" Inherits="TaiJiTu" ContentType="Image/Jpeg" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title>
</head>
<body><form id="form1" runat="server"><div></div></form>
</body>
</html>

后台代码：

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;public partial class TaiJiTu : System.Web.UI.Page
{private Encoder myEncoder;private EncoderParameter myEncoderParameter;private EncoderParameters myEncoderParameters;protected void Page_Load(object sender, EventArgs e){int imgWidth = 400;                 //图象尺寸int eyeRadius = imgWidth / 20;      //鱼眼半径int headDiameter = imgWidth / 2;    //鱼头直径Bitmap image = new Bitmap(imgWidth, imgWidth);image.SetResolution(300, 300);Graphics graphics = Graphics.FromImage(image);//设置图像质量graphics.CompositingQuality = CompositingQuality.HighQuality;graphics.SmoothingMode = SmoothingMode.AntiAlias;graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;//底色填充为白色Brush white = new SolidBrush(Color.White);graphics.FillRectangle(white, new Rectangle(0, 0, imgWidth, imgWidth));Brush blue = new SolidBrush(Color.Blue);//定义蓝色笔刷Brush red = new SolidBrush(Color.Red);//定义红色笔刷//整个圆形填充蓝色graphics.FillPie(blue, 0, 0, imgWidth, imgWidth, 0, 360);//定义右边的路径（红色部分）GraphicsPath redPath = new GraphicsPath();//初始化路径redPath.AddArc(0, 0, imgWidth, imgWidth, 0, -180);redPath.AddArc(0, headDiameter / 2, headDiameter, headDiameter, 0, -180);redPath.AddArc(headDiameter, headDiameter / 2, headDiameter, headDiameter, 0, 180);//填充右边部分graphics.FillPath(red, redPath);//填充红色眼睛graphics.FillPie(red, new Rectangle(headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360);//填充蓝色眼睛graphics.FillPie(blue, new Rectangle(headDiameter + headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360);graphics.Dispose();//写入到Response输出流中去，普通质量//image.Save(Response.OutputStream, ImageFormat.Jpeg);//修改图片保存质量ImageCodecInfo myImageCodecInfo = GetEncoder(ImageFormat.Jpeg);myEncoder = Encoder.Quality;myEncoderParameters = new EncoderParameters(1);//图片质量等级myEncoderParameter = new EncoderParameter(myEncoder, 100L);myEncoderParameters.Param[0] = myEncoderParameter;//使用指定参数输出image.Save(Response.OutputStream, myImageCodecInfo, myEncoderParameters);}private static ImageCodecInfo GetEncoder(ImageFormat format){ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();foreach (ImageCodecInfo codec in codecs){if (codec.FormatID == format.Guid){return codec;}}return null;}
}

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