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asp.net實現C#繪制太極圖的方法

編輯：關於ASP.NET

這篇文章主要介紹了asp.net實現C#繪制太極圖的方法,實例分析了asp.net繪制圖形的技巧,具有一定參考借鑒價值,需要的朋友可以參考下

本文實例講述了asp.net實現C#繪制太極圖的方法。分享給大家供大家參考。具體如下：

成品圖如下所示：

asp.net實現C#繪制太極圖的方法三聯

html頁面：

注意設置:

代碼如下: ContentType="Image/Jpeg"

代碼如下: <%@ 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>

後台代碼：

代碼如下: 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; //圖象尺寸
int eyeRadius = imgWidth / 20; //魚眼半徑
int headDiameter = imgWidth / 2; //魚頭直徑

Bitmap image = new Bitmap(imgWidth, imgWidth);
image.SetResolution(300, 300);

Graphics graphics = Graphics.FromImage(image);

//設置圖像質量
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

//底色填充為白色
Brush white = new SolidBrush(Color.White);
graphics.FillRectangle(white, new Rectangle(0, 0, imgWidth, imgWidth));

Brush blue = new SolidBrush(Color.Blue);//定義藍色筆刷
Brush red = new SolidBrush(Color.Red);//定義紅色筆刷

//整個圓形填充藍色
graphics.FillPie(blue, 0, 0, imgWidth, imgWidth, 0, 360);

//定義右邊的路徑（紅色部分）
GraphicsPath redPath = new GraphicsPath();//初始化路徑
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);
//填充右邊部分
graphics.FillPath(red, redPath);
//填充紅色眼睛
graphics.FillPie(red, new Rectangle(headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360);
//填充藍色眼睛
graphics.FillPie(blue, new Rectangle(headDiameter + headDiameter / 2 - eyeRadius, headDiameter - eyeRadius, eyeRadius * 2, eyeRadius * 2), 0, 360);

graphics.Dispose();

//寫入到Response輸出流中去，普通質量
//image.Save(Response.OutputStream, ImageFormat.Jpeg);

//修改圖片保存質量
ImageCodecInfo myImageCodecInfo = GetEncoder(ImageFormat.Jpeg);
myEncoder = Encoder.Quality;
myEncoderParameters = new EncoderParameters(1);
//圖片質量等級
myEncoderParameter = new EncoderParameter(myEncoder, 100L);
myEncoderParameters.Param[0] = myEncoderParameter;

//使用指定參數輸出
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;
}
}