source: josm/src/org/openstreetmap/josm/data/Bounds.java@ 23

package org.openstreetmap.josm.data;

/**
 * This is a simple data class for "rectangular" areas of the world, given in lat/lon/min/max
 * values.
 * 
 * Do not confuse this with "Area", which is an OSM-primitive for a vector of nodes, 
 * describing some area (like a sea).
 * 
 * @author imi
 */
public class Bounds {
        /**
         * The minimum and maximum coordinates.
         */
        public GeoPoint min, max;

        /**
         * Return the center point based on the lat/lon values.
         *
         * @return The center of these bounds.
         */
        public GeoPoint centerLatLon() {
                GeoPoint p = new GeoPoint((min.lat+max.lat) / 2, (min.lon+max.lon) / 2);
                return p;
        }

        /**
         * Return the center point based on the x/y values.
         *
         * @return The center of these bounds.
         */
        public GeoPoint centerXY() {
                GeoPoint p = new GeoPoint();
                p.x = (min.x+max.x) / 2;
                p.y = (min.y+max.y) / 2;
                return p;
        }
        
        /**
         * Construct bounds out of two geopoints
         */
        public Bounds(GeoPoint min, GeoPoint max) {
                this.min = min;
                this.max = max;
        }
        
        /**
         * @return The bounding rectangle that covers <code>this</code> and 
         *              the <code>other</code> bounds, regarding the x/y values.
         */
        public Bounds mergeXY(Bounds other) {
                GeoPoint nmin = new GeoPoint();
                nmin.x = Math.min(min.x, other.min.x);
                nmin.y = Math.min(min.y, other.min.y);
                GeoPoint nmax = new GeoPoint();
                nmax.x = Math.max(max.x, other.max.x);
                nmax.y = Math.max(max.y, other.max.y);
                return new Bounds(nmin, nmax);
        }
        
        /**
         * @return The bounding rectangle that covers <code>this</code> and 
         *              the <code>other</code> bounds, regarding the lat/lon values.
         */
        public Bounds mergeLatLon(Bounds other) {
                GeoPoint nmin = new GeoPoint(
                                Math.min(min.lat, other.min.lat),
                                Math.min(min.lon, other.min.lon));
                GeoPoint nmax = new GeoPoint(
                                Math.max(max.lat, other.max.lat),
                                Math.max(max.lon, other.max.lon));
                return new Bounds(nmin, nmax);
        }
}