WorldWind学习系列三：简单功能分析——主窗体的键盘监听处理及拷贝和粘贴位置坐标功能
原文转自：http://www.cnblogs.com/wuhenke/archive/2009/12/12/1622404.html
在分析功能时发现，各功能都有自己的快捷键相应，比如今天要分析的 Copy Coordinates (Ctrl+C)和Paste Coordinates (Ctrl+P)，以及主窗体的全屏功能也是通过快捷键（Alt+Enter）。这就使我需要彻底分析一下主窗体的键盘监听处理啦。
主窗体的键盘监听处理
与WorldWind学习系列三：功能分析——截屏功能和“关于”窗体分析 中AboutDialog.cs分析类似，WorldWind主窗体也是重载了OnKeyUp，使窗体接受键盘响应。
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->936行
protected override void OnKeyUp(KeyEventArgs e)
{
if (this.webBrowserPanel.IsTyping()) //如果是在“网页窗体”（稍后介绍）里输入地址，则主窗体处不相应键盘事件，将 e.Handled = true;表示已经处理事件啦。
e.Handled = true;
else e.Handled = HandleKeyUp(e); //此处HandleKeyUp（）是真正处理主窗口的键盘响应
base.OnKeyUp(e);
}
HandleKeyUp函数
真正处理键盘响应函数
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> ///
/// Handles key up events.
///
///
/// Returns true if the key is handled.
protected bool HandleKeyUp(KeyEventArgs e)
{
// keep keypresses inside browser url bar
if(e.Handled)
return true;
if (e.Alt) //处理Alt 组合键
{
// Alt key down
switch(e.KeyCode)
{
case Keys.A:
menuItemAlwaysOnTop_Click(this,e);
return true;
case Keys.Q:
using( PropertyBrowserForm worldWindSettings = new PropertyBrowserForm( Settings, "World Wind Settings" ) )
{
worldWindSettings.Icon = this.Icon;
worldWindSettings.ShowDialog();
}
return true;
case Keys.W:
menuItemOptions_Click(this, EventArgs.Empty);
return true;
case Keys.Enter: // 实现全屏功能，稍后看看如何实现？？
this.FullScreen = !this.FullScreen;
return true;
case Keys.F4:
Close();
return true;
}
}
else if (e.Control) //处理Ctrl组合键
{
// Control key down
switch(e.KeyCode)
{
case Keys.C:
case Keys.Insert: //调用拷贝坐标功能，即Copy Coordinates (Ctrl+C)
menuItemCoordsToClipboard_Click(this, e);
return true;
case Keys.F:
return true;
case Keys.H:
if (progressMonitor != null)
{
bool wasVisible = progressMonitor.Visible;
progressMonitor.Close();
progressMonitor.Dispose();
progressMonitor = null;
if (wasVisible)
return true;
}
progressMonitor = new ProgressMonitor();
progressMonitor.Icon = this.Icon;
progressMonitor.Show();
return true;
case Keys.I:
menuItemConfigWizard_Click(this,e);
return true;
case Keys.N:
menuItemOptions_Click(this,e);
return true;
case Keys.T: //控制工具栏的显示。
menuItemShowToolbar_Click(this,e);
return true;
case Keys.V: //粘贴坐标，并转向粘贴的坐标位置。今天分析
menuItemEditPaste_Click(this,e);
return true;
case Keys.S: //保存截屏，已经分析
menuItemSaveScreenShot_Click(this, e);
return true;
}
}
else if (e.Shift)
{
// Shift key down
switch(e.KeyCode)
{
case Keys.Insert:
menuItemEditPaste_Click(this,e);
return true;
case Keys.S:
menuItemSunShading_Click(this, e);
return true;
case Keys.A:
menuItemAtmosphericScattering_Click(this, e);
return true;
}
}
else
{
// Other or no modifier key
switch(e.KeyCode)
{
//case Keys.B:
// menuItemWMS_Click(this, e);
// return true;
case Keys.G:
return true;
case Keys.L:
menuItemLayerManager_Click(this, e);
return true;
case Keys.P:
if(this.pathMaker == null)
{
this.pathMaker = new PathMaker(this.worldWindow);
this.pathMaker.Icon = this.Icon;
}
this.pathMaker.Visible = !this.pathMaker.Visible;
return true;
case Keys.V:
if(this.placeBuilderDialog == null)
{
this.placeBuilderDialog = new PlaceBuilder( this.worldWindow );
this.placeBuilderDialog.Icon = this.Icon;
}
this.placeBuilderDialog.Visible = !this.placeBuilderDialog.Visible;
return true;
case Keys.Escape: //退出全屏快捷键 ESC
if (this.FullScreen)
{
this.FullScreen = false;
return true;
}
break;
case Keys.D1:
case Keys.NumPad1:
this.VerticalExaggeration = 1.0f;
return true;
case Keys.D2:
case Keys.NumPad2:
this.VerticalExaggeration = 2.0f;
return true;
case Keys.D3:
case Keys.NumPad3:
this.VerticalExaggeration = 3.0f;
return true;
case Keys.D4:
case Keys.NumPad4:
this.VerticalExaggeration = 4.0f;
return true;
case Keys.D5:
case Keys.NumPad5:
this.VerticalExaggeration = 5.0f;
return true;
case Keys.D6:
case Keys.NumPad6:
this.VerticalExaggeration = 6.0f;
return true;
case Keys.D7:
case Keys.NumPad7:
this.VerticalExaggeration = 7.0f;
return true;
case Keys.D8:
case Keys.NumPad8:
this.VerticalExaggeration = 8.0f;
return true;
case Keys.D9:
case Keys.NumPad9:
this.VerticalExaggeration = 9.0f;
return true;
case Keys.D0:
case Keys.NumPad0:
this.VerticalExaggeration = 0.0f;
return true;
case Keys.F1:
this.menuItemAnimatedEarth_Click(this,e);
return true;
case Keys.F2:
this.menuItemModisHotSpots_Click(this,e);
return true;
case Keys.F5:
this.menuItemRefreshCurrentView_Click(this,e);
return true;
case Keys.F6:
return true;
case Keys.F7:
this.menuItemShowLatLonLines_Click(this,e);
return true;
case Keys.F8:
this.menuItemPlanetAxis_Click(this,e);
return true;
case Keys.F9:
this.menuItemShowCrosshairs_Click(this,e);
return true;
case Keys.F10:
this.menuItemShowPosition_Click(this,e);
return true;
case Keys.F11:
this.menuItemConstantMotion_Click(this,e);
return true;
case Keys.F12:
this.menuItemPointGoTo_Click(this,e);
return true;
}
}
return false;
}
从上面，我们可以温故和强化窗体键盘响应功能如何实现的知识点。不再多说了。
我们看看如何实现全屏功能的，FullScreen属性控制的？注意不是函数，我想这是它值得我们学习的优点。
全屏属性
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> private bool FullScreen
{
get
{
return this.FormBorderStyle == FormBorderStyle.None;
}
set
{
if (value)
{
// Enter full-screen.
this.normalWindowState = this.WindowState;
this.WindowState = FormWindowState.Normal;
this.FormBorderStyle = FormBorderStyle.None;
this.Menu = null;
this.WindowState = FormWindowState.Maximized;
}
else
{
// Go back to normal
this.WindowState = normalWindowState;
this.FormBorderStyle = FormBorderStyle.Sizable;
this.Menu = mainMenu;
}
}
}
原来Fullscreen属性只是封装了Form原有的 FormBorderStyle和WindowState,同时在里面控制了主菜单Menu的显示与否。这里就是写好属性的妙用，可以学习一下，写出更好的属性控制，而不是简单的带参数的函数控制。
拷贝位置坐标功能
WorldWind.cs
1790
拷贝代码
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->private void menuItemCoordsToClipboard_Click(object sender, System.EventArgs e)
{
if (this.worldWindow.CurrentWorld == null)
return;
WorldWindUri uri = new WorldWindUri(worldWindow.CurrentWorld.Name,worldWindow.DrawArgs.WorldCamera); //构建保存当前状态的WorldWindUri对象
string uriString = uri.ToString();
Clipboard.SetDataObject(uriString, true);//调用Form类的Clipboard.SetDataObject()方法，将字符串拷贝到粘贴板上
}
WorldWindUri对象保存的字符串例如为：
worldwind://goto/world=Earth&lat=34.25320&lon=-101.57184&alt=48652548&dir=0.1
worldwind://goto/world=Earth&lat=-41.38362&lon=101.15747&alt=48652548&dir=0.2
worldwind://goto/world=Earth&lat=-89.89754&lon=136.64324&alt=48652548&dir=-7.2
我们应该学会使用Form类的Clipboard.SetDataObject()方法 实现自己的拷贝功能,如拷贝图片等复杂对象。
粘贴位置坐标功能
粘贴坐标信息，并重新定位
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->2150
void menuItemEditPaste_Click(object sender, System.EventArgs e)
{
//获取拷贝的对象
IDataObject iData = Clipboard.GetDataObject();
if(!iData.GetDataPresent(DataFormats.Text))
return;
//获取拷贝的字符串
string clipBoardString = (string)iData.GetData(DataFormats.Text);
try
{
//通过字符串，解析还原出对象。这原理很像对象XML序列化
worldWindUri = WorldWindUri.Parse(clipBoardString);
ProcessWorldWindUri();
}
catch (UriFormatException caught)
{
MessageBox.Show(caught.Message, "Unable to paste - you are not stupid!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
粘贴坐标信息，并重新定位
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->2150
void menuItemEditPaste_Click(object sender, System.EventArgs e)
{
//获取拷贝的对象
IDataObject iData = Clipboard.GetDataObject();
if(!iData.GetDataPresent(DataFormats.Text))
return;
//获取拷贝的字符串
string clipBoardString = (string)iData.GetData(DataFormats.Text);
try
{
//通过字符串，解析还原出对象。这原理很像对象XML序列化
worldWindUri = WorldWindUri.Parse(clipBoardString);
ProcessWorldWindUri();
}
catch (UriFormatException caught)
{
MessageBox.Show(caught.Message, "Unable to paste - you are not stupid!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
worldWindow.Goto实现最终是调用WorldWindow类的 GotoLatLon()。
转到特定的经纬度位置
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->WorldWindow类的 GotoLatLon()转到特定的位置
///
/// Moves to specified location.
///
/// Latitude in degrees of target position. (-90 - 90).
/// Longitude in degrees of target position. (-180 - 180).
/// Camera heading in degrees (0-360) or double.NaN for no change.
/// Camera altitude in meters or double.NaN for no change.
///
/// Camera tilt in degrees (-90 - 90) or double.NaN for no change.
public void GotoLatLon(double latitude, double longitude, double heading, double altitude, double perpendicularViewRange, double tilt)
{
if(!double.IsNaN(perpendicularViewRange))
altitude = m_World.EquatorialRadius * Math.Sin(MathEngine.DegreesToRadians(perpendicularViewRange * 0.5));
if (altitude<1)
altitude = 1;
this.drawArgs.WorldCamera.SetPosition(latitude, longitude, heading, altitude, tilt);
}
关键是:this.drawArgs.WorldCamera.SetPosition(latitude, longitude, heading, altitude, tilt)其中调用了Camera.cs中的SetPosition函数，其中主要代码
Point3d p = Quaternion4d.QuaternionToEuler(m_Orientation);
_latitude.Radians = p.Y;
_longitude.Radians = p.X;
_heading.Radians = p.Z;
此中用到Quaternion4d和Point3d类。