source: josm/src/org/openstreetmap/josm/data/GeoPoint.java@ 17

package org.openstreetmap.josm.data;



/**
 * An point holding latitude/longitude and their corresponding north/east values, 
 * which may not be initialized.
 *
 * if x or y is "NaN", these are not initialized yet.
 *
 * @author imi
 */
public class GeoPoint implements Cloneable {

        /**
         * Latitude/Longitude coordinates.
         */
        public double lat = Double.NaN, lon = Double.NaN;

        /**
         * East/North coordinates;
         */
        public double x = Double.NaN, y = Double.NaN;

        /**
         * Construct the point with latitude / longitude values.
         * The x/y values are left uninitialized.
         * 
         * @param lat Latitude of the point.
         * @param lon Longitude of the point.
         */
        public GeoPoint(double lat, double lon) {
                this.lat = lat;
                this.lon = lon;
        }

        /**
         * Construct the point with all values unset (set to NaN)
         */
        public GeoPoint() {
        }

        @Override
        public GeoPoint clone() {
                try {return (GeoPoint)super.clone();} catch (CloneNotSupportedException e) {}
                return null;
        }

        /**
         * Return the squared distance of the northing/easting values between 
         * this and the argument.
         *
         * @param other The other point to calculate the distance to.
         * @return The square of the distance between this and the other point,
         *              regarding to the x/y values.
         */
        public double distanceXY(GeoPoint other) {
                return (x-other.x)*(x-other.x)+(y-other.y)*(y-other.y);
        }
        
        /**
         * @return <code>true</code>, if the other GeoPoint has the same lat/lon values.
         */
        public boolean equalsLatLon(GeoPoint other) {
                return lat == other.lat && lon == other.lon;
        }
}