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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