Android Open Source - aBusTripMK Geo Point

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License

The source code is released under:
GNU General Public License
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Java Source Code

// Created by plusminus on 21:28:12 - 25.09.2008
package org.andnav.osm.util;
/*  w  w w  .  ja  va  2s.c om*/
import org.andnav.osm.util.constants.GeoConstants;
import org.andnav.osm.views.util.constants.MathConstants;

import android.location.Location;

/**
 * 
 * @author Nicolas Gramlich
 *
 */
public class GeoPoint implements MathConstants, GeoConstants{
        // ===========================================================
        // Constants
        // ===========================================================

        // ===========================================================
        // Fields
        // ===========================================================
        
        private int mLongitudeE6;
        private int mLatitudeE6;

        // ===========================================================
        // Constructors
        // ===========================================================
        
        public GeoPoint(final int aLatitudeE6, final int aLongitudeE6) {
                this.mLatitudeE6 = aLatitudeE6;
                this.mLongitudeE6 = aLongitudeE6;
        }

        public GeoPoint(final double aLatitude, final double aLongitude) {
                this.mLatitudeE6 = (int)(aLatitude * 1E6);
                this.mLongitudeE6 = (int)(aLongitude * 1E6);
        }
        
        public GeoPoint(Location aLocation) {
                this(aLocation.getLatitude(), aLocation.getLongitude());
        }


        protected static GeoPoint fromDoubleString(final String s, final char spacer) {
                final int spacerPos = s.indexOf(spacer);
                return new GeoPoint((int) (Double.parseDouble(s.substring(0,
                                spacerPos - 1)) * 1E6), (int) (Double.parseDouble(s.substring(
                                spacerPos + 1, s.length())) * 1E6));
        }
        
        public static GeoPoint fromIntString(final String s){
                final int commaPos = s.indexOf(',');
                return new GeoPoint(Integer.parseInt(s.substring(0,commaPos-1)),
                                Integer.parseInt(s.substring(commaPos+1,s.length())));
        } 

        // ===========================================================
        // Getter & Setter
        // ===========================================================
        
        public int getLongitudeE6() {
                return this.mLongitudeE6;
        }

        public int getLatitudeE6() {
                return this.mLatitudeE6;
        }
        
        public void setLongitudeE6(final int aLongitudeE6) {
                this.mLongitudeE6 = aLongitudeE6;
        }

        public void setLatitudeE6(final int aLatitudeE6) {
                this.mLatitudeE6 = aLatitudeE6;
        }
        
        public void setCoordsE6(final int aLatitudeE6, final int aLongitudeE6) {
                this.mLatitudeE6 = aLatitudeE6;
                this.mLongitudeE6 = aLongitudeE6;
        }

        // ===========================================================
        // Methods from SuperClass/Interfaces
        // ===========================================================
        
        @Override
        public String toString(){
                return new StringBuilder().append(this.mLatitudeE6).append(",").append(this.mLongitudeE6).toString();
        }

        public String toDoubleString() {
                return new StringBuilder().append(this.mLatitudeE6 / 1E6).append(",").append(this.mLongitudeE6  / 1E6).toString();
        }
        
        @Override
        public boolean equals(Object obj) {
                if(!(obj instanceof GeoPoint))
                        return false;
                GeoPoint g = (GeoPoint)obj;
                return g.mLatitudeE6 == this.mLatitudeE6 && g.mLongitudeE6 == this.mLongitudeE6;
        }

        // ===========================================================
        // Methods
        // ===========================================================
        
        /**
         * @see Source@ http://www.geocities.com/DrChengalva/GPSDistance.html
         * @param gpA
         * @param gpB
         * @return distance in meters
         */
        public int distanceTo(final GeoPoint other) {           

                final double a1 = DEG2RAD * (this.mLatitudeE6 / 1E6);
                final double a2 = DEG2RAD * (this.mLongitudeE6 / 1E6);
                final double b1 = DEG2RAD * (other.mLatitudeE6 / 1E6);
                final double b2 = DEG2RAD * (other.mLongitudeE6 / 1E6);

                final double cosa1 = Math.cos(a1);
                final double cosb1 = Math.cos(b1);
                
                final double t1 = cosa1*Math.cos(a2)*cosb1*Math.cos(b2);
                
                final double t2 = cosa1*Math.sin(a2)*cosb1*Math.sin(b2);

                final double t3 = Math.sin(a1)*Math.sin(b1);

                final double tt = Math.acos( t1 + t2 + t3 );

                return (int)(RADIUS_EARTH_METERS*tt);
        }

        // ===========================================================
        // Inner and Anonymous Classes
        // ===========================================================
}
Java Source Code List
