[WorldWind学习]4.DrawArgs对象
WorldWind的WorldWindow控件包含只读属性DrawArgs
public DrawArgs DrawArgs { get { return this.drawArgs; } }
DrawArgs渲染参数对象,负责记录当前渲染的各个参数
WorldWindow的CurrentWorld属性赋值时也给drawArgs的CurrentWorld赋值。
View Code
1 public World CurrentWorld 2 { 3 get 4 { 5 return m_World; 6 } 7 set 8 { 9 m_World = value; 10 if(m_World != null) 11 { 12 MomentumCamera camera = new MomentumCamera(m_World.Position, m_World.EquatorialRadius ); 13 if(!World.Settings.CameraResetsAtStartup) 14 { 15 camera.SetPosition( 16 World.Settings.CameraLatitude.Degrees, 17 World.Settings.CameraLongitude.Degrees, 18 World.Settings.CameraHeading.Degrees, 19 World.Settings.CameraAltitude, 20 World.Settings.CameraTilt.Degrees, 21 0 22 ); 23 } 24 this.drawArgs.WorldCamera = camera; 25 26 this.drawArgs.CurrentWorld = value; 27 this.layerManagerButton = new LayerManagerButton( 28 Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), @"Data\Icons\Interface\layer-manager2.png"), 29 m_World); 30 31 this._menuBar.AddToolsMenuButton( this.layerManagerButton, 0 ); 32 this._menuBar.AddToolsMenuButton( new PositionMenuButton( Path.GetDirectoryName(Application.ExecutablePath) + "\\Data\\Icons\\Interface\\coordinates.png"), 1); 33 this._menuBar.AddToolsMenuButton( new LatLonMenuButton( Path.GetDirectoryName(Application.ExecutablePath) + "\\Data\\Icons\\Interface\\lat-long.png", m_World), 2); 34 this.layerManagerButton.SetPushed(World.Settings.ShowLayerManager); 35 36 // TODO: Decide how to load grids 37 m_World.RenderableObjects.Add(new Renderable.LatLongGrid(m_World)); 38 } 39 } 40 }
drawArgs的WorldCamera属性,注意DrawArgs类的public static CameraBase Camera = null;Camera是一个静态对象,具有缓存相机的作用。
作者:太一吾鱼水
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