RiverRat  - An MIT iCampus project

http://web.mit.edu/riverrat/

RaceObject.java

package riverrat;

import java.util.Vector;

public class RaceObject {
        static final boolean DEBUG = false;

        Fix thefix;
        Vector track;
        int id;
        int sn;
        int tracklength = 5000;
        
        public RaceObject() {
                id = -1;
                thefix = new Fix();
                track = new Vector();
        }
        
        public RaceObject(int newid) {
                id = newid;
                thefix = new Fix();
                track = new Vector();
        }
        
        public Vector getTrack() {
                return track;
        }
        
        public void setTrackLength(int length) {
                tracklength = length;
        }
        
        public float getHeading() {
                return thefix.getHeading();
        }
        
        public Fix getFix() {
                return thefix;
        }
        
        public float getLat() {
                return thefix.getLat();
        }
        
        public float getLon() {
                return thefix.getLon();
        }
        
        public int getID() {
                return id;
        }
        
        public int getSN() {
                return sn;
        }
        
        public void setSN(int newsn) {
                sn = newsn;
        }
        
        public void update(Fix newfix) {
                if (newfix.getHeading() == -1.0f) {
                        //use arctan function to convert from lat/lon differences to radian heading
                        float tempheading = (float) (Math.atan2(newfix.getLat()-thefix.getLat(),newfix.getLon()-thefix.getLon()));
                        //tempheading is in radians (plus or minus) from the x-axis, where the + direction is ccw
                        tempheading = (-tempheading) + (float) (Math.PI/2.0f);
                        //shifted, zero now corresponds to y-axis (north) but range is from -Pi/2 to +3Pi/2
                        if(tempheading < 0) {
                                tempheading = tempheading+(float) (2.0f*Math.PI);
                        } //range now goes from 0 to 2Pi, where zero corresponds to north
                        newfix.setHeading(tempheading);
                        if(DEBUG) System.out.println("update(): heading has been set to "+newfix.getHeading());
                }
                track.addElement(newfix); //add new value to the bottom of the vector
                if(track.size() > tracklength) {
                        track.removeElementAt(0); //remove oldest value from the top of the vector
                }
                thefix = newfix; //set the current position to the new value
                if(DEBUG) {
                        System.out.println("update(): track has been changed to");
                        for(int i = 0; i < track.size() ; i++) {
                                System.out.println("update(): rank "+i+" is "+((Fix)track.elementAt(i)).fixToString());
                        }
                }
        }
        
        public String objectToString() {
                return ("RaceObject "+id+": "+thefix.fixToString()+"  "+(int) (((360.0f*thefix.getHeading())/(2.0f*Math.PI)))+"¡");
        }
}

 

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