File	Doc	Category	Size	Date	Package
Aircraft.java	API Doc	Example	8955	Sun Feb 13 17:12:30 GMT 2000	gui2000

Aircraft

• java.lang.Object
  • java.util.Observable

Fields Summary
private String	callSign
int	east
int	north
private int	heading
int	height
private int	speed
private int	climbRate
private int	turnRate
private int	secToIncident
private String	newCallSign
private int	targetHeading
private int	targetHeight
private int	climbing
private int	turning
private boolean	running

Constructors Summary

Aircraft(String callSign, int east, int north, int heading, int height, int speed, int climbRate, int turnRate, int secToIncident, String newCallSign) Create a new Aircraft object representing one particular aircraft in the simulated airspace. In general, these objects will be loaded from a datafile. param callSign the call sign for this aircraft that can be used to identify it over a radio link param east the east/west distance (metres) from centre of the airspace param north the north/south (metres) distance from centre of the airspace param heading the heading in degrees - 0 is NORTH and angles are measured clockwise so EAST is 90 param height the height in feet above sea level of the aircraft param speed the speed in kilometres per hour of the aircraft. param climbRate in metres/sec represents how fast this aircraft may may climb (or dive) in order to change altitude param turnRate in degrees/sec indicates the rate at which this aircraft can change heading this.callSign = callSign; this.east = east; this.heading = heading; this.north = north; this.height = height; this.speed = speed; this.climbRate = climbRate; this.turnRate = turnRate; this.secToIncident = secToIncident; this.newCallSign = newCallSign;

Methods Summary
private void	changeHeading() heading += turning * turnRate; if( heading < 0 ) { heading += 360; } if( heading > 359 ) { heading -= 360; } if( Math.abs( heading - targetHeading ) < turnRate ) { heading = targetHeading; turning = 0; radio( "Turn completed - heading is " + heading + " degrees" ); }
private void	changeHeight() height += climbing * climbRate; if( Math.abs( height - targetHeight ) < climbRate ) { height = targetHeight; climbing = 0; radio( "At new altitude of " + height + " feet" ); }
public AircraftData	getData() // 1 = turn right, -1 = turn left AircraftData d = new AircraftData(); d.callSign = callSign; d.east = east; d.north = north; d.heading = heading; d.flightLevel = height/100; d.speed = speed; return d;
void	order(java.lang.String command) Parse, acknowledge and implement the command from air traffic control param command the String to obey The command string should begin with one of the following four instructions: RIGHT to turn clockwise LEFT to turn anticlockwise CLIMB to increase altitude DESCEND to decrease altitude The single instruction string should be followed by an integer specifying a new flight level (100's of feet) or heading. A pilot may query an order if it seems to be odd or impossible. if( callSign.equals( "7600" ) ) return; if( command.length() == 0 ) { radio( "Missed your message" ); return; } StringTokenizer st = new StringTokenizer( command ); String replyString = null; String theCommand = null; String theValue = null; int value = 0; try { theCommand = st.nextToken(); theValue = st.nextToken(); value = Integer.parseInt(theValue.trim()); } catch( Exception e ) { radio( "Do not understand - please repeat" ); return; } if( theCommand.equals( "RIGHT" ) ) { if( (value < 0) || (value > 359) ) { radio( "Please repeat target bearing" ); return; } targetHeading = value; turning = +1; replyString = "Turning right to " + value + " degrees"; } else if( theCommand.equals( "LEFT" ) ) { if( (value < 0) || (value > 359) ) { radio( "Please repeat target bearing" ); return; } targetHeading = value; turning = -1; replyString = "Turning left to " + value + " degrees"; } else if( theCommand.equals( "CLIMB" ) ) { if( value > 350 ) { radio( "Sorry - I'm not a rocket can't get that high" + "\n\tPlease re-send flight level" ); return; } if( value*100 < height ) { radio( "Cannot comply, am currently at flight level " + height/100 ); return; } targetHeight = value*100; climbing = +1; replyString = "Climbing to flight level " + value; } else if( theCommand.equals( "DESCEND" ) ) { if( value < 10 ) { radio( "Isn't that rather low?" + "\n\tPlease resend flight level" ); return; } if( value*100 > height ) { radio( "Cannot comply, am currently at flight level " + height/100 ); return; } targetHeight = value*100; climbing = -1; replyString = "Descending to flight level " + value; } else { radio( "Do not understand - please repeat" ); return; } radio( "Wilco : " + replyString );
void	radio(java.lang.String message) if( callSign.equals( "7600" ) ) return; setChanged(); notifyObservers( message );
public void	run() int sec = 0; while( running ) { if( sec == secToIncident ) { callSign = newCallSign; } if( turning != 0 ) { changeHeading(); } if( climbing != 0 ) { changeHeight(); } north += Math.round((10 * speed*1000/3600 * Math.cos( heading * Math.PI / 180 ))) / 10; east += Math.round((10 * speed*1000/3600 * Math.sin( heading * Math.PI / 180 ))) / 10; try { Thread.sleep(1000); sec++; } catch( InterruptedException ie ) {} }
public java.lang.String	toString() Provided for debugging purposes return "Aircraft: " + callSign + "\tPosition: " + east + "E " + north + "N" + "\tHeading: " + heading + "\tHeight: " + height + "\tSpeed: " + speed;