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asp.net C#绘制太极图

2014-05-09 15:41 316 查看

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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