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asp.net实现C#绘制太极图的方法

2015-03-27??来源:新网巢??我有话说??收藏本文

?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:

html页面:

注意设置:

ContentType="Image/Jpeg"
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TaiJiTu.aspx.cs" Inherits="TaiJiTu" ContentType="Image/Jpeg" %> 
  
  
  
  
  
  
  
    

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;  
    }  
}

成品图如下所示:

实现C#绘制太极图的方法

(责编:如斯)
关键词: 太极图
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