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asp.net实现C#绘制太极图的方法

时间：2021-01-10 00:54 编辑：来源：阅读：
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摘要：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： [img]http://files.jb51.net/file_images/article/201502/2015216154404375.jpg?201511615524[/img] html页面：注意设置:

[u]复制代码[/u] 代码如下:

ContentType="Image/Jpeg"

[u]复制代码[/u] 代码如下:

<%@ 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：

[u]复制代码[/u] 代码如下:

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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