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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2012 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.optaplanner.examples.vehiclerouting.domain.location;

import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.vehiclerouting.domain.VehicleRoutingSolution;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamInclude;

@XStreamAlias("VrpLocation")
@XStreamInclude({
        AirLocation.class,
        RoadLocation.class
})
public abstract class Location extends AbstractPersistable {

    protected String name = null;
    protected double latitude;
    protected double longitude;

    public Location() {
    }

    public Location(long id, double latitude, double longitude) {
        super(id);
        this.latitude = latitude;
        this.longitude = longitude;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getLatitude() {
        return latitude;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }

    public double getLongitude() {
        return longitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    // ************************************************************************
    // Complex methods
    // ************************************************************************

    /**
     * The distance's unit of measurement depends on the {@link VehicleRoutingSolution}'s {@link DistanceType}.
     * It can be in miles or km, but for most cases it's in the TSPLIB's unit of measurement.
     *
     * @param location never null
     * @return a positive number, the distance multiplied by 1000 to avoid floating point arithmetic rounding errors
     */
    public abstract long getDistanceTo(Location location);

    public double getAirDistanceDoubleTo(Location location) {
        // Implementation specified by TSPLIB http://www2.iwr.uni-heidelberg.de/groups/comopt/software/TSPLIB95/
        // Euclidean distance (Pythagorean theorem) - not correct when the surface is a sphere
        double latitudeDifference = location.latitude - latitude;
        double longitudeDifference = location.longitude - longitude;
        return Math.sqrt(
                (latitudeDifference * latitudeDifference) + (longitudeDifference * longitudeDifference));
    }

    /**
     * The angle relative to the direction EAST.
     *
     * @param location never null
     * @return in Cartesian coordinates
     */
    public double getAngle(Location location) {
        // Euclidean distance (Pythagorean theorem) - not correct when the surface is a sphere
        double latitudeDifference = location.latitude - latitude;
        double longitudeDifference = location.longitude - longitude;
        return Math.atan2(latitudeDifference, longitudeDifference);
    }

    @Override
    public String toString() {
        if (name == null) {
            return super.toString();
        }
        return name;
    }

}