Asp.net implements the C # method for drawing a sequence chart,
The example in this article describes how to use asp.net to implement a C # plot. Share it with you for your reference. The details are as follows:
The finished diagram is as follows:
Html page:
Note settings:
Copy codeThe Code is as follows: ContentType = "Image/Jpeg"
Copy codeThe Code is as follows: <% @ 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>
Background code:
Copy codeThe Code is as follows: 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; // image size
Int eyeRadius = imgWidth/20; // fish eye radius
Int headDiameter = imgWidth/2; // fish head diameter
Bitmap image = new Bitmap (imgWidth, imgWidth );
Image. SetResolution (300,300 );
Graphics graphics = Graphics. FromImage (image );
// Set the image quality
Graphics. CompositingQuality = CompositingQuality. HighQuality;
Graphics. SmoothingMode = SmoothingMode. AntiAlias;
Graphics. InterpolationMode = InterpolationMode. HighQualityBicubic;
// The background color is white.
Brush white = new SolidBrush (Color. White );
Graphics. FillRectangle (white, new Rectangle (0, 0, imgWidth, imgWidth ));
Brush blue = new SolidBrush (Color. Blue); // defines the blue Brush.
Brush red = new SolidBrush (Color. Red); // defines the red Brush.
// Fill the entire circle in blue
Graphics. FillPie (blue, 0, 0, imgWidth, imgWidth, and 0,360 );
// Define the path on the right (in red)
GraphicsPath redPath = new GraphicsPath (); // initialization path
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 );
// Fill in the right part
Graphics. FillPath (red, redPath );
// Fill the red eye
Graphics. FillPie (red, new Rectangle (headDiameter/2-eyeRadius, headDiameter-eyeRadius, eyeRadius * 2, eyeRadius * 2), 0,360 );
// Fill the blue eyes
Graphics. FillPie (blue, new Rectangle (headDiameter + headDiameter/2-eyeRadius, headDiameter-eyeRadius, eyeRadius * 2, eyeRadius * 2), 0,360 );
Graphics. Dispose ();
// Write the data to the Response output stream, with normal quality
// Image. Save (Response. OutputStream, ImageFormat. Jpeg );
// Modify the Image Storage Quality
ImageCodecInfo myImageCodecInfo = GetEncoder (ImageFormat. Jpeg );
MyEncoder = Encoder. Quality;
MyEncoderParameters = new EncoderParameters (1 );
// Image Quality Grade
MyEncoderParameter = new EncoderParameter (myEncoder, 100L );
MyEncoderParameters. Param [0] = myEncoderParameter;
// Output with the specified parameter
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;
}
}
I hope this article will help you with C # programming.
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