Design Mode: bridge mode; design mode: Bridge

Design Mode: bridge mode; design mode: Bridge

1. Class Diagram

Instance class diagram

2. Create a project

........................

3. Create a Matrix: pixel Matrix class, auxiliary class, and image files of various formats are eventually converted into pixel matrices. different operating systems provide different methods of real pixel matrices.

Namespace BridgeSample

{

Class Matrix

{

// Code omitted

}

} 

4. Create ImageImp: Abstract The operating system implementation class and act as the implementation class interface.

Namespace BridgeSample

{

Interface ImageImp

{

Void DoPaint (Matrix m); // displays the pixel Matrix.

}

}

5. Create WindowsImp: The Implementation class of the Windows operating system and act as the specific implementation class. 

Using System;

Namespace BridgeSample

{

Class WindowsImp: ImageImp

{

Public void DoPaint (Matrix m)

{

// Call the rendering function of Windows to draw the pixel matrix.

Console. Write ("display images in Windows :");

}

}

}

6. New LinuxImp: Linux implementation class, acting as a specific implementation class

// LinuxImp. cs

Using System;

Namespace BridgeSample

{

Class LinuxImp: ImageImp

{

Public void DoPaint (Matrix m)

{

// Call the rendering function of the Linux system to draw the pixel matrix.

Console. Write ("display images in Linux :");

}

}

}

7. Create a UnixImp: UNIX operating system implementation class, acting as a specific implementation class 

Using System;

Namespace BridgeSample

{

Class UnixImp: ImageImp

{

Public void DoPaint (Matrix m)

{

// Call the rendering function of the Unix system to draw the pixel matrix.

Console. Write ("display images in Unix operating systems :");

}

}

}

8. Image: Abstract Image class, acting as an abstract class

Namespace BridgeSample

{

Abstract class Image

{

Protected ImageImp imp;

// Inject implementation class interface object

Public void SetImageImp (ImageImp imp)

{

This. imp = imp;

}

/// <Summary>

/// Convert a file to a pixel matrix

/// </Summary>

/// <Param name = "fileName"> </param>

Public abstract void ParseFile (string fileName );

}

}

9. JPGImage: JPG Format Image class, acting as an extended abstract class 

Using System;

Namespace BridgeSample

{

Class JPGImage: Image

{

Public override void ParseFile (string fileName)

{

// Parse the JPG file and obtain a pixel matrix object m;

Matrix m = new Matrix ();

Imp. DoPaint (m); // call the pixel conversion method of the Operating System

 

Console. WriteLine ("{0}, in JPG format. ", FileName );

}

}

}

10. Create a PNGImage: PNG Image class to act as an extended abstract class.

Using System;

Namespace BridgeSample

{

Class PNGImage: Image

{

Public override void ParseFile (string fileName)

{

// Parse the PNG file and obtain a pixel matrix object m;

Matrix m = new Matrix ();

Imp. DoPaint (m); // call the pixel conversion method of the Operating System

 

Console. WriteLine ("{0}, in PNG format. ", FileName );

}

}

}

11. Create a New BMP image: BMP Format Image class, acting as an extended abstract class

Using System;

Namespace BridgeSample

{

Class BMP Image: Image

{

Public override void ParseFile (string fileName)

{

// Parse the PNG file and obtain a pixel matrix object m;

Matrix m = new Matrix ();

Imp. DoPaint (m); // call the pixel conversion method of the Operating System

 

Console. WriteLine ("{0}, in the format of BMP. ", FileName );

}

}

}

12. Create a New GIF image class to act as an extended abstract class.

Using System;

Namespace BridgeSample

{

Class GIFImage: Image

{

Public override void ParseFile (string fileName)

{

// Parse the PNG file and obtain a pixel matrix object m;

Matrix m = new Matrix ();

Imp. DoPaint (m); // call the pixel conversion method of the Operating System

Console. WriteLine ("{0}, in GIF format. ", FileName );

}

}

}

13. Create a configuration file App. config

<? Xml version = "1.0" encoding = "UTF-8"?>

<Configuration>

<Deleetask>

<! -- Refinedaskaction -->

<Add key = "image" value = "BridgeSample. PNGImage"/>

<! -- ConcreteImplementor -->

<Add key = "OS" value = "BridgeSample. WindowsImp"/>

</AppSettings>

</Configuration>

14. Edit Program: client test class

Using System;

Using System. Configuration;

Using System. Reflection;

Namespace BridgeSample

{

Class Program

{

Static void Main (string [] args)

{

Image image;

ImageImp imp;

// Read the configuration file

String imageType = ConfigurationManager. receivettings ["image"];

String osType = ConfigurationManager. receivettings ["OS"];

// Reflect the generated object

Image = (Image) Assembly. Load ("BridgeSample"). CreateInstance (imageType );

Imp = (ImageImp) Assembly. Load ("BridgeSample"). CreateInstance (osType );

Image. SetImageImp (imp );

Image. ParseFile ("map of China ");

Console. Read ();

}

}

}

15. run mode code:

 

16. To change the image file format or OS, you only need to modify the configuration file.

<? Xml version = "1.0" encoding = "UTF-8"?>

<Configuration>

<Deleetask>

<! -- Refinedaskaction -->

<Add key = "image" value = "BridgeSample. BMP image"/>

<! -- ConcreteImplementor -->

<Add key = "OS" value = "BridgeSample. LinuxImp"/>

</AppSettings>

</Configuration>