[WorldWind学习]5.相机对象

　　首先查看WorldWindow的事件：OnMouseUp、OnMouseMove、HandleKeyDown，这几个方法中多次调用this.drawArgs.WorldCamera的各种属性实现了场景的控制，包括球的旋转、场景的放大缩小，上下移动。

　　1. 接下来查看CameraBase类RotationYawPitchRoll虚函数：

1 public virtual void RotationYawPitchRoll(Angle yaw, Angle pitch, Angle roll)
 2         {
 3         //    this._orientation *= MathEngine.EulerToQuaternion(yaw.Radians, pitch.Radians, roll.Radians);
 4         //    Vector3 v = MathEngine.QuaternionToEuler(this._orientation);
 5             
 6         //    if(!double.IsNaN(v.Y))
 7         //        this._latitude.Radians = v.Y;
 8         //    if(!double.IsNaN(v.X))
 9         //        this._longitude.Radians = v.X;
10         //    if(Math.Abs(roll.Radians)>Single.Epsilon)
11         //        this._heading.Radians = v.Z;
12 
13 
14             m_Orientation = Quaternion4d.EulerToQuaternion(yaw.Radians, pitch.Radians, roll.Radians) * m_Orientation;
15 
16             Point3d p = Quaternion4d.QuaternionToEuler(m_Orientation);
17             if(!double.IsNaN(p.Y))
18                 _latitude.Radians = p.Y;
19             if(!double.IsNaN(p.X))
20                 _longitude.Radians = p.X;
21             if(Math.Abs(roll.Radians) > double.Epsilon)
22                 _heading.Radians = p.Z;
23         }

RotationYawPitchRoll

　　WorldCamera类的RotationYawPitchRoll方法：

1 public override void RotationYawPitchRoll(Angle yaw, Angle pitch, Angle roll)
 2         {
 3             _targetOrientation = Quaternion4d.EulerToQuaternion(yaw.Radians, pitch.Radians, roll.Radians) * _targetOrientation;
 4             
 5             Point3d v = Quaternion4d.QuaternionToEuler(_targetOrientation);
 6             if(!double.IsNaN(v.Y))
 7                 this._targetLatitude.Radians = v.Y;
 8             if(!double.IsNaN(v.X))
 9                 this._targetLongitude.Radians = v.X;
10             if(Math.Abs(roll.Radians)>double.Epsilon)
11                 this._targetHeading.Radians = v.Z;
12         }

RotationYawPitchRoll

　　MomentumCamera类的RotationYawPitchRoll方法：

1 public override void RotationYawPitchRoll(Angle yaw, Angle pitch, Angle roll)
 2         {
 3             if(World.Settings.cameraHasMomentum)
 4             {
 5                 _latitudeMomentum += pitch/100;
 6                 _longitudeMomentum += yaw/100;
 7                 _headingMomentum += roll/100;
 8             }
 9 
10             this._targetOrientation = Quaternion4d.EulerToQuaternion( yaw.Radians, pitch.Radians, roll.Radians ) * _targetOrientation;
11             Point3d v = Quaternion4d.QuaternionToEuler(_targetOrientation);
12             if(!double.IsNaN(v.Y))
13             {
14                 this._targetLatitude.Radians = v.Y;
15                 this._targetLongitude.Radians = v.X;
16                 if(!World.Settings.cameraTwistLock)
17                     _targetHeading.Radians = v.Z;
18             }
19 
20             base.RotationYawPitchRoll(yaw,pitch,roll);
21         }

RotationYawPitchRoll

　　2. CameraBase类的Pan方法：

1 /// <summary>
 2         /// Pan the camera using delta values
 3         /// 平移相机，采用经纬度偏移量
 4         /// </summary>
 5         /// <param name="lat">Latitude offset</param>
 6         /// <param name="lon">Longitude offset</param>
 7         public virtual void Pan(Angle lat, Angle lon)
 8         {
 9             if(Angle.IsNaN(lat)) lat = this._latitude;
10             if(Angle.IsNaN(lon)) lon = this._longitude;
11             lat += _latitude;
12             lon += _longitude;
13 
14         //    this._orientation = MathEngine.EulerToQuaternion(
15         //        lon.Radians,
16         //        lat.Radians,
17         //        _heading.Radians);
18 
19             m_Orientation = Quaternion4d.EulerToQuaternion(
20                 lon.Radians, lat.Radians, _heading.Radians);
21 
22             Point3d p = Quaternion4d.QuaternionToEuler(m_Orientation);
23 
24         //    Vector3 v = MathEngine.QuaternionToEuler(this._orientation);
25         //    if(!double.IsNaN(v.Y))
26         //    {
27         //        this._latitude.Radians = v.Y;
28         //        this._longitude.Radians = v.X;
29         //    }
30 
31             if(!double.IsNaN(p.Y))
32             {
33                 _latitude.Radians = p.Y;
34                 _longitude.Radians = p.X;
35             }
36         }

Pan

　　MomentumCamera类的Pan方法：

1 public override void Pan(Angle lat, Angle lon)
 2         {
 3             if(World.Settings.cameraHasMomentum)
 4             {
 5                 _latitudeMomentum += lat/100;
 6                 _longitudeMomentum += lon/100;
 7             }
 8 
 9             if(Angle.IsNaN(lat)) lat = this._targetLatitude;
10             if(Angle.IsNaN(lon)) lon = this._targetLongitude;
11             lat += _targetLatitude;
12             lon += _targetLongitude;
13 
14             if(Math.Abs(lat.Radians)>Math.PI/2-1e-3)
15             {
16                 lat.Radians = Math.Sign(lat.Radians)*(Math.PI/2 - 1e-3);
17             }
18 
19             this._targetOrientation = Quaternion4d.EulerToQuaternion(
20                 lon.Radians,
21                 lat.Radians,
22                 _targetHeading.Radians);
23 
24             Point3d v = Quaternion4d.QuaternionToEuler(this._targetOrientation);
25             if(!double.IsNaN(v.Y))
26             {
27                 _targetLatitude.Radians = v.Y;
28                 _targetLongitude.Radians = v.X;
29                 _targetHeading.Radians = v.Z;
30 
31                 if(!World.Settings.cameraSmooth)
32                 {
33                     _latitude = _targetLatitude;
34                     _longitude = _targetLongitude;
35                     _heading = _targetHeading;
36                     m_Orientation = _targetOrientation;
37                 }
38             }
39         }

Pan

 

错误 1 无法注册程序集“F:\World_Wind_1.4.0_Source\HtmlEditor\bin\Debug\HtmlEditor.dll”- 拒绝访问。请确保您正在以管理员身份运行应用程序。对注册表项“HKEY_CLASSES_ROOT\onlyconnect.HtmlDialog”的访问被拒绝。 HtmlEditor

解决方法：HtmlEditor项目的属性，取消“生成（Build ）”选项卡的为COM互操作注册