earthproj

Class TrajectoryObjects

java.lang.Object

earthproj.TrajectoryObjects

public class TrajectoryObjects
extends java.lang.Object

This class contains all of the properties and behavior (methods) of a trajectory object - one which moves on the surface of the Earth, through the atmosphere, or in space.

Constructor Summary

Constructors

Constructor and Description
TrajectoryObjects() The ArrayList and RenderableLayer objects are constructed.

Method Summary

Modifier and Type	Method and Description
double[]	getGEOCoord() The purpose is obtain the current coordinates of the trajectory object.
void	loadWorldWindModel(gov.nasa.worldwind.awt.WorldWindowGLCanvas wwd) The purpose is to access the Earth model, then to load the trajectory object into a renderable layer and load that into the Earth model.
boolean	propagateTrajectory() The purpose is to propagate the trajectory through one time step.
void	setGeoInit(double lat, double lon, double alt) The purpose is to set the initial conditions (starting location) of the trajectory object.
void	setPathObject(java.awt.Color color, double lineWidth) The purpose is to use the Path class to build the trajectory curve / line generator - and set its properties.
void	setPolylineObject(java.awt.Color color, double lineWidth) The purpose is to use the Polyline class to build the trajectory curve / line generator - and set its properties.
void	setTrajResolution(double resDial) The purpose to set the trajectory step resolution.
void	setTrajTypeOne() The purpose to set a 1st trajectory type with specific characteristics - for demo purposes.
void	setTrajTypeTwo() The purpose to set a 2nd trajectory type with specific characteristics - for demo purposes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TrajectoryObjects

public TrajectoryObjects()

The ArrayList and RenderableLayer objects are constructed. The counters ict and tct are initialized and the boolean trajRun is set to true.

Method Detail

propagateTrajectory

public boolean propagateTrajectory()

The purpose is to propagate the trajectory through one time step. The previous and current positions are loaded into the ArrayList and then into either the Polyline or Path object. Then the Earth model rendering is updated.

Returns:

The status of the trajectory: 1) true = still active - trajectory is not complete, or 2) false = inactive - trajectory is complete.

getGEOCoord

public double[] getGEOCoord()

The purpose is obtain the current coordinates of the trajectory object. This method is called by the radar object when performing a track update.

Returns:

The coordinates (latitude, longitude, altitude) of the object at this point in time.

setTrajResolution

public void setTrajResolution(double resDial)

The purpose to set the trajectory step resolution. A high number, such as 10.0, will make the trajectory increments very small, whereas a low number, such as 1.0, will make the steps large.

Parameters:

resDial - The trajectory resolution value.

setTrajTypeOne

public void setTrajTypeOne()

The purpose to set a 1st trajectory type with specific characteristics - for demo purposes.

setTrajTypeTwo

public void setTrajTypeTwo()

The purpose to set a 2nd trajectory type with specific characteristics - for demo purposes.

setPathObject

public void setPathObject(java.awt.Color color,
                          double lineWidth)

The purpose is to use the Path class to build the trajectory curve / line generator - and set its properties.

Parameters:

color - The color of the trajectory curve / line.

lineWidth - The width of the trajectory curve / line.

setPolylineObject

public void setPolylineObject(java.awt.Color color,
                              double lineWidth)

The purpose is to use the Polyline class to build the trajectory curve / line generator - and set its properties.

Parameters:

color - The color of the trajectory curve / line.

lineWidth - The width of the trajectory curve / line.

setGeoInit

public void setGeoInit(double lat,
                       double lon,
                       double alt)

The purpose is to set the initial conditions (starting location) of the trajectory object.

Parameters:

lat - The initial latitude coordinate.

lon - The initial longitude coordinate.

alt - The initial altitude coordinate.

loadWorldWindModel

public void loadWorldWindModel(gov.nasa.worldwind.awt.WorldWindowGLCanvas wwd)

The purpose is to access the Earth model, then to load the trajectory object into a renderable layer and load that into the Earth model.

Parameters:

wwd - The World Wind Earth model.