程式師世界 >> 編程語言 >> .NET網頁編程 >> ASP.NET >> ASP.NET基礎 >> asp.net實現C#繪制太極圖的方法

asp.net實現C#繪制太極圖的方法

編輯：ASP.NET基礎

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：

html頁面：

注意設置:

復制代碼代碼如下:ContentType="Image/Jpeg"

復制代碼代碼如下:<%@ 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：

復制代碼代碼如下: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;
    }
}