asp.net实现C#绘制太极图的方法

本文实例讲述了asp.net实现C#绘制太极图的方法。分享给大家供大家参考。具体如下：

成品图如下所示：

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;  

    }  

}

希望本文所述对大家的C#程序设计有所帮助。

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