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C# 调用 Google Earth Com API开发(三)

来源:互联网 作者:佚名 时间:2022-06-10 15:18
好久没有更新《C#调用Google Earth Com API开发》系列文章了,今天带给大家的是第三篇,本篇相对于第二篇主要改进了三个方面。1) 实现GoogleEarth显示画面随窗口大小改变而改变2) 截获Goo
好久没有更新《C#调用Google Earth Com API开发》系列文章了,今天带给大家的是第三篇,本篇相对于第二篇主要改进了三个方面。 1) 实现GoogleEarth显示画面随窗口大小改变而改变 2) 截获GoogleEarth鼠标消息,实现单击、双击功能;鼠标滚轮缩放现在只能放大!O(∩_∩)O~ 3) 实现GoogleEarth彩色截图(测试环境:Windows 2003 Server ,Vista与Win7中不可用,XP未测)

好久没有更新《C#调用Google Earth Com API开发》系列文章了,今天带给大家的是第三篇,本篇相对于第二篇主要改进了三个方面。

1) 实现GoogleEarth显示画面随窗口大小改变而改变

2) 截获GoogleEarth鼠标消息,实现单击、双击功能;鼠标滚轮缩放现在只能放大!O(∩_∩)O~

3) 实现GoogleEarth彩色截图(测试环境:Windows 2003 Server ,Vista与Win7中不可用,XP未测)

下面还是继续看代码:

1、GoogleEarth动态改变大小

   1: /// <summary>
   2: /// 重新改变GoogleEarth视图的大小
   3: /// </summary>
   4: private void ResizeGoogleControl()
   5: {
   6:     NativeMethods.SendMessage(GEHWnd, (uint)NativeMethods.WM_COMMAND, NativeMethods.WM_PAINT, 0);
   7:     NativeMethods.PostMessage(GEHWnd, NativeMethods.WM_QT_PAINT, 0, 0);
   8:  
   9:     RECT mainRect = new RECT();
  10:     NativeMethods.GetWindowRect(GEHWnd, out mainRect);
  11:     clientRect = new RECT();
  12:     NativeMethods.GetClientRect(GEHrender, out clientRect);
  13:  
  14:     int offsetW = mainRect.Width - clientRect.Width;
  15:     int offsetH = mainRect.Height - clientRect.Height;
  16:  
  17:     int newWidth = this.Control.Width + (int)offsetW;
  18:     int newHeight = this.Control.Height + (int)offsetH;
  19:  
  20:     NativeMethods.SetWindowPos(GEHWnd, NativeMethods.HWND_TOP,
  21:         0, 0, newWidth, newHeight, 
  22:         NativeMethods.SWP_FRAMECHANGED);
  23:  
  24:     NativeMethods.SendMessage(GEHWnd, (uint)NativeMethods.WM_COMMAND, NativeMethods.WM_SIZE, 0);
  25: }

2、鼠标消息

此例子中对于鼠标消息到处理使用了钩子,调用HookAPI.dll实现。

   1:          /// <summary>
   2:          /// 鼠标钩子
   3:          /// </summary>
   4:          private MouseHook mouseHook;
   5:   
   6:          // 设置鼠标钩子
   7:          mouseHook = new MouseHook();
   8:          mouseHook.MouseClick += new MouseEventHandler(mouseHook_MouseClick);
   9:          mouseHook.MouseDbClick += new MouseEventHandler(mouseHook_MouseDbClick);
  10:          mouseHook.MouseWheel += new MouseEventHandler(mouseHook_MouseWheel);
  11:         // 启动鼠标钩子
  12:          mouseHook.StartHook(HookType.WH_MOUSE_LL, 0);

单击事件:

   1: /// <summary>
   2: /// 鼠标钩子。鼠标单击事件
   3: /// </summary>
   4: /// <param name="sender"></param>
   5: /// <param name="e"></param>
   6: void mouseHook_MouseClick(object sender, MouseEventArgs e)
   7: {
   8:     IntPtr hWnd = NativeMethods.WindowFromPoint(e.Location);
   9:     if (hWnd == this.GeRenderHWnd)
  10:     {
  11:         Point point = this.Control.PointToClient(e.Location);
  12:         // 如果鼠标击点位置在控件内部,则说明鼠标点击了GoogleEarth视图
  13:         if (this.Control.ClientRectangle.Contains(point))
  14:         {
  15:             Console.WriteLine("点击了GoogleEarth...");
  16:  
  17:             DoublePoint dp = ((GERenderPanel)Control).DetermineScreenCoordinates(point.X, point.Y);
  18:  
  19:             ParameterizedThreadStart pts = new ParameterizedThreadStart(ShowMouseClickPoint);
  20:  
  21:             Thread thread = new Thread(pts);
  22:             thread.Start(dp);
  23:  
  24:         }
  25:     }
  26: }
  27:  
  28: protected void ShowMouseClickPoint(object obj)
  29: {
  30:     //Thread.Sleep(20);
  31:     DoublePoint dp = (DoublePoint)obj;
  32:     PointOnTerrainGE pGe = GeApp.GetPointOnTerrainFromScreenCoords(dp.X, dp.Y);
  33:     Console.WriteLine("鼠标点击了:Lnt=" + pGe.Longitude.ToString() 
  34:         + ";Lat=" + pGe.Latitude.ToString());
  35: }

 

双击事件:

   1: /// <summary>
   2:  /// 鼠标钩子。鼠标双击事件
   3:  /// </summary>
   4:  /// <param name="sender"></param>
   5:  /// <param name="e"></param>
   6:  void mouseHook_MouseDbClick(object sender, MouseEventArgs e)
   7:  {
   8:      IntPtr hWnd = NativeMethods.WindowFromPoint(e.Location);
   9:      if (hWnd == this.GeRenderHWnd)
  10:      {
  11:          Point point = this.Control.PointToClient(e.Location);
  12:          // 如果鼠标击点位置在控件内部,则说明鼠标点击了GoogleEarth视图
  13:          if (this.Control.ClientRectangle.Contains(point))
  14:          {
  15:              Console.WriteLine("xx双击了GoogleEarth...");
  16:  
  17:              DoublePoint dp = ((GERenderPanel)Control).DetermineScreenCoordinates(point.X, point.Y);
  18:  
  19:              ParameterizedThreadStart pts = new ParameterizedThreadStart(ShowMouseDbClickPoint);
  20:  
  21:              Thread thread = new Thread(pts);
  22:              thread.Start(dp);
  23:  
  24:          }
  25:      }
  26:  }
  27:  
  28:  protected void ShowMouseDbClickPoint(object obj)
  29:  {
  30:      //Thread.Sleep(20);
  31:      DoublePoint dp = (DoublePoint)obj;
  32:      PointOnTerrainGE pGe = GeApp.GetPointOnTerrainFromScreenCoords(dp.X, dp.Y);
  33:      Console.WriteLine("xx鼠标双击了:Lnt=" + pGe.Longitude.ToString()
  34:          + ";Lat=" + pGe.Latitude.ToString());
  35:  
  36:      MessageBox.Show("我还是出来一下吧!省得你不知道你已经双击了鼠标!");
  37:  }

 

这两处代码还比较简陋,比如未添加主窗口焦点检测,相信读者可以自行添加。O(∩_∩)O~

3、截图

程序中有两种截图功能,一种是GoogleEarth自带的截图功能,只能截取黑白图片;另一种为彩色截图,但是Vista以上操作系统不支持,还未找到合适的方法实现Vista与Win7兼容。

1) GoogleEarth自带截图功能:

   1: GEViewContent view = GetGEView();
   2:  
   3: if (view != null)
   4: {
   5:     ApplicationGE ge = view.GeApplication;
   6:     if (ge != null && ge.IsInitialized() > 0)
   7:     {
   8:         using (SaveFileDialog sfd = new SaveFileDialog())
   9:         {
  10:             sfd.Filter = "jpg图片|*.jpg";
  11:             sfd.AddExtension = true;
  12:             sfd.CheckPathExists = true;
  13:             sfd.Title = "保存Google Earth截图";
  14:  
  15:             if (sfd.ShowDialog() == DialogResult.OK)
  16:             {
  17:                 ge.SaveScreenShot(sfd.FileName, 100);
  18:             }
  19:         }
  20:     }
  21: }

2) 彩色截图:

   1: GEViewContent view = GetGEView();
   2: if (view != null)
   3: {
   4:     int nWidth = view.Control.Width;
   5:     int nHeight = view.Control.Height;
   6:     Point pt = view.Control.PointToScreen(view.Control.Location);
   7:     int nXSrc = pt.X;
   8:     int nYSrc = pt.Y;
   9:  
  10:     IntPtr hRender = view.GeRenderHWnd;
  11:  
  12:     if (hRender != IntPtr.Zero)
  13:     {
  14:         // 取得Render DC
  15:         IntPtr hRenderDC = NativeMethods.GetWindowDC(hRender);
  16:         // 创建hBitmap
  17:         IntPtr hBitmap = NativeMethods.CreateCompatibleBitmap(hRenderDC, nWidth, nHeight);
  18:         // 创建MEM DC
  19:         IntPtr hMemDC = NativeMethods.CreateCompatibleDC(hRenderDC);
  20:         // 将Bitmap Select到MemDC
  21:         NativeMethods.SelectObject(hMemDC, hBitmap);
  22:         // 直接拷屏
  23:         NativeMethods.BitBlt(hMemDC, 0, 0, nWidth, nHeight,
  24:             hRenderDC, 0, 0, 13369376);
  25:  
  26:         using(Bitmap bmp = Bitmap.FromHbitmap(hBitmap))
  27:         {
  28:             using(SaveFileDialog sfd = new SaveFileDialog())
  29:             {
  30:                 sfd.Filter = "JPG图片|*.jpg|PNG图片|*.png";
  31:                 sfd.AddExtension = true;
  32:                 sfd.CheckPathExists = true;
  33:                 sfd.Title = "保存Google Earth截图";
  34:  
  35:                 if (sfd.ShowDialog() == DialogResult.OK)
  36:                 {
  37:                     ImageFormat imgFormat = null;
  38:                     // 默认选择JPG
  39:                     if (sfd.FilterIndex == 0)
  40:                     {
  41:                         imgFormat = ImageFormat.Jpeg;
  42:                     }
  43:                     // 选择PNG
  44:                     else
  45:                     {
  46:                         imgFormat = ImageFormat.Png;
  47:                     }
  48:                     bmp.Save(sfd.FileName, imgFormat);
  49:                 }
  50:             }
  51:             
  52:             //销毁资源
  53:             NativeMethods.DeleteDC(hRenderDC);
  54:             NativeMethods.DeleteDC(hMemDC);
  55:         }
  56:     }

 

OK,这篇GE开发到此为止,请读者继续等待后面的精彩文章…

不好意思,刚才忘记上传源程序了!

https://files.cnblogs.com/wpwen/GEDemo_2009-05-22.rar

GeDemo

GeDemo

【文章原创作者:美国服务器 http://www.558idc.com/mg.html提供,感恩】
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