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  • [WorldWind学习]2.WorldWindow控件

    首先查看WorldWindow 的构造函数,接着查看InitializeGraphics()函数。

     1 public WorldWindow()
     2         {
     3             this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
     4 
     5             // The m_Device3d can't be created unless the control is at least 1 x 1 pixels in size
     6             this.Size = new Size(1,1);
     7 
     8             try
     9             {
    10                 // Now perform the rendering m_Device3d initialization
    11                 // Skip DirectX initialization in design mode
    12                 if(!IsInDesignMode())
    13                     this.InitializeGraphics();//初始化设备Device
    14 
    15                 //Post m_Device3d creation initialization
    16                 this.drawArgs = new DrawArgs(m_Device3d, this );
    17                 this.m_RootWidget = new WorldWind.Widgets.RootWidget(this);
    18                 this.m_NewRootWidget = new WorldWind.NewWidgets.RootWidget(this);
    19 
    20                 //this.m_RootWidget.ChildWidgets.Add(layerManager);
    21                 DrawArgs.RootWidget = this.m_RootWidget;
    22                 DrawArgs.NewRootWidget = this.m_NewRootWidget;
    23 
    24                 m_FpsTimer.Elapsed += new System.Timers.ElapsedEventHandler(m_FpsTimer_Elapsed);
    25                 m_FpsTimer.Start();
    26 
    27                 TimeKeeper.Start();
    28             //    WorldWind.Widgets.LayerManager layerManager = new WorldWind.Widgets.LayerManager();
    29             //    m_RootWidget.ChildWidgets.Add(layerManager);
    30 
    31             }
    32             catch (InvalidCallException caught)
    33             {
    34                 throw new InvalidCallException(
    35                     "Unable to locate a compatible graphics adapter. Make sure you are running the latest version of DirectX.", caught );
    36             }
    37             catch (NotAvailableException caught)
    38             {
    39                 throw new NotAvailableException(
    40                     "Unable to locate a compatible graphics adapter. Make sure you are running the latest version of DirectX.", caught );
    41             }
    42         }
    View Code
     1 private void InitializeGraphics()
     2         {
     3             // Set up our presentation parameters
     4             m_presentParams = new PresentParameters();
     5 
     6             m_presentParams.Windowed = true;
     7             m_presentParams.SwapEffect = SwapEffect.Discard;
     8             m_presentParams.AutoDepthStencilFormat = DepthFormat.D16;
     9             m_presentParams.EnableAutoDepthStencil = true;
    10             
    11             if(!World.Settings.VSync)
    12                 // Disable wait for vertical retrace (higher frame rate at the expense of tearing)
    13                 m_presentParams.PresentationInterval = PresentInterval.Immediate;
    14 
    15             int adapterOrdinal = 0;
    16             try
    17             {
    18                 // Store the default adapter
    19                 adapterOrdinal = Manager.Adapters.Default.Adapter;
    20             }
    21             catch
    22             {
    23                 // User probably needs to upgrade DirectX or install a 3D capable graphics adapter
    24                 throw new NotAvailableException();
    25             }
    26 
    27             DeviceType dType = DeviceType.Hardware;
    28 
    29             foreach(AdapterInformation ai in Manager.Adapters)
    30             {
    31                 if(ai.Information.Description.IndexOf("NVPerfHUD") >= 0)
    32                 {
    33                     adapterOrdinal = ai.Adapter;
    34                     dType = DeviceType.Reference;
    35                 }
    36             }
    37             CreateFlags flags = CreateFlags.SoftwareVertexProcessing;
    38 
    39             // Check to see if we can use a pure hardware m_Device3d
    40             Caps caps = Manager.GetDeviceCaps(adapterOrdinal, DeviceType.Hardware);
    41 
    42             // Do we support hardware vertex processing?
    43             if(caps.DeviceCaps.SupportsHardwareTransformAndLight)
    44                 //    // Replace the software vertex processing
    45                 flags = CreateFlags.HardwareVertexProcessing;
    46 
    47             // Use multi-threading for now - TODO: See if the code can be changed such that this isn't necessary (Texture Loading for example)
    48             flags |= CreateFlags.MultiThreaded | CreateFlags.FpuPreserve;
    49 
    50             try
    51             {
    52                 // Create our m_Device3d
    53                 m_Device3d = new Device(adapterOrdinal, dType, this, flags, m_presentParams);
    54             }
    55             catch( Microsoft.DirectX.DirectXException    )
    56             {
    57                 throw new NotSupportedException("Unable to create the Direct3D m_Device3d.");
    58             }
    59 
    60             // Hook the m_Device3d reset event
    61             m_Device3d.DeviceReset += new EventHandler(OnDeviceReset);
    62             m_Device3d.DeviceResizing += new CancelEventHandler(m_Device3d_DeviceResizing);
    63             OnDeviceReset(m_Device3d, null);
    64         }

    控件重要的方法:

    OnApplicationIdle函数定义:
    public void OnApplicationIdle(object sender, EventArgs e)//The world render loop.实现世界的渲染循环
    OnPaint函数定义:
    protected override void OnPaint(PaintEventArgs e)    // Occurs when the control is redrawn and m_isRenderDisabled=true.
    protected override void OnMouseWheel(MouseEventArgs e)  //处理鼠标滚轮事件
    protected override void OnKeyDown(KeyEventArgs e)  //重载处理键盘按下的事件
    protected override void OnKeyUp(KeyEventArgs e)     //重载处理键盘弹起事件
    protected override void OnMouseDoubleClick(MouseEventArgs e)
    protected override void OnMouseUp(MouseEventArgs e)

    控件几个重要的属性和字段:

      private Device m_Device3d;
      private DrawArgs drawArgs;
      private World m_World;
      private Cache m_Cache;
      private Thread m_WorkerThread;

    文章未经说明均属原创,学习笔记可能有大段的引用,一般会注明参考文献。 欢迎大家留言交流,转载请注明出处。
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  • 原文地址:https://www.cnblogs.com/yhlx125/p/2986827.html
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