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简单放大镜

Introduction 介绍

This is a fun little gadget for your desktop: a simple magnifier. 这是一个有趣的桌面小玩意:一个简单的放大镜。

Background 背景

I believe, many of you have already seen at least one magnifier application. I tried a few including the one which is built-in at the OS, however, I didn't like them one way or another. So, I decided to implement a simple one for my own usage.

我相信,你们中的许多人已经看过至少一个放大镜应用程序。我试过一些包括内置在操作系统的,然而,我不喜欢他们这样或那样的方式。所以,我决定实现一个简单属于我自己的用法。

Well, I've been using it quite sometime by now and it really works great. I thought you may find it interesting as well.

嗯,我到目前为止一直在使用它,它真的是一个伟大的工程。我想你会发现它有趣。

A Few Words About the Code 关于代码的几句话

As I mentioned earlier, the program in fact is a simple application. However, it still demonstrates a few interesting points: First of all, it shows how to capture a screen image, double buffering, moving a Windows form programmatically, and serializing/deserializing configuration information through XmlSerializer. Second of all, the little application is designed to be a fun application in my mind, so it doesn't follow conventional Windows programming steps. Instead, I've used a very small borderless window as the main form. It has only 3 buttons (actually, hot spots) to do all functionality it provides. The first one instantiates a magnifier form, the second one to do the configuration, and finally, the third one is to exit from application.

正如我之前提到的,这个程序实际上是一个简单的应用程序。然而,它还演示了一些有趣的观点:首先,它展示了如何捕捉屏幕图像,双缓冲技术,编程移动一个Windows窗体,并通过XmlSerializer配置信息进行序列化/反序列化。其次,这个小应用程序在我的印象中被设计成一个有趣的应用程序,所以它不遵循传统的Windows编程步骤。相反,我使用了一个非常小的无边界的窗口为主要形式。它只有三个按钮(实际上,热点)提供了所有功能。第一个实例化一个放大镜形式,第二个配置,最后,第三个是退出应用程序。

Here is a screenshot of the application: 这是一个应用程序的屏幕截图:

The configuration section provides quite a few things to play with: 配置部分提供了很多好玩的东西:

Some of the code snippets are also shown below: 一些代码片段如下所示:

// Make the window (the form) elliptical
          GraphicsPath gp = new GraphicsPath();
          gp.AddEllipse(ClientRectangle);
          Region = new Region(gp);
        //--- Double Buffering ---  
        protected override void OnPaintBackground(PaintEventArgs e)
          {
          if (mConfiguration.DoubleBuffered)
          {
          // Do not paint background (required for double buffering)!
          }
          else
          {
          base.OnPaintBackground(e);
          }
          }
          protected override void  OnPaint(PaintEventArgs e)
          {
          if (mBufferImage == null)
          {
          mBufferImage = new Bitmap(Width, Height);
          }
          Graphics bufferGrf = Graphics.FromImage(mBufferImage); 
           Graphics g;  
           if (mConfiguration.DoubleBuffered)
          {
          g = bufferGrf;
          }
          else
          {
          g = e.Graphics;
          }
           if (mScreenImage != null)
          {
          Rectangle dest = new Rectangle(0, 0, Width, Height);
          int w = (int)(Width / mConfiguration.ZoomFactor);
          int h = (int)(Height / mConfiguration.ZoomFactor);
          int x = Left - w / 2 + Width / 2;
          int y = Top - h / 2 + Height / 2; 
           g.DrawImage(
          mScreenImage,
          dest,
          x, y,
          w, h,
          GraphicsUnit.Pixel);
          }   
           if (mImageMagnifier != null)
          {
          g.DrawImage(mImageMagnifier, 0, 0, Width, Height);
          }  
           if (mConfiguration.DoubleBuffered)
          {
          e.Graphics.DrawImage(mBufferImage, 0, 0, Width, Height);
          } 
          } 
          //--- XML Serialization --- 
          public class XmlUtility
          {
          public static void Serialize(Object data, string fileName)
          {
          Type type = data.GetType();
          XmlSerializer xs = new XmlSerializer(type);
          XmlTextWriter xmlWriter = new XmlTextWriter(fileName, System.Text.Encoding.UTF8);
          xmlWriter.Formatting = Formatting.Indented;
          xs.Serialize(xmlWriter, data);
          xmlWriter.Close();
          }      
           public static Object Deserialize(Type type, string fileName)
         {
          XmlSerializer xs = new XmlSerializer(type);     
           XmlTextReader xmlReader = new XmlTextReader(fileName);
         Object data = xs.Deserialize(xmlReader);    
          xmlReader.Close();     
          return data;
          } 
          } 

Please take a look at the provided code to see the details in the implementation. 请看看所提供的代码实现的细节。

Conclusion 结论

It was really fun to code this application. I shared it with my friends and many really liked it. Hope you guys will like it as much as I did. Have a nice day!

这个应用程序代码真的很有趣。我和我的朋友分享它和许多朋友真的很喜欢它。希望你们能像我一样喜欢它。祝你有美好的一天!