Cluster.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * ActivityCluster.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2009 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.core.network.algorithms.intersectionSimplifier.containers;

import java.util.ArrayList;
import java.util.List;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.Point;
import org.matsim.api.core.v01.Coord;
import org.matsim.api.core.v01.Id;
import org.matsim.api.core.v01.Identifiable;

public class Cluster implements Identifiable<Cluster>{
    private final Logger log = LogManager.getLogger(Cluster.class);

    private Id<Cluster> clusterId;
    private Coord centerOfGravity;
    private final List<ClusterActivity> activities;
    private Geometry concaveHull;

    public Cluster(Id<Cluster> clusterId){
        this.clusterId = clusterId;
        this.activities = new ArrayList<>();
    }

    public void setCenterOfGravity(){
        if(this.concaveHull == null){
            if(!activities.isEmpty()){
                double xTotal = 0;
                double yTotal = 0;
                for (ClusterActivity p : activities) {
                    xTotal += p.getCoord().getX();
                    yTotal += p.getCoord().getY();
                }
                double xCenter = xTotal / (double) activities.size();
                double yCenter = yTotal / (double) activities.size();

                centerOfGravity = new Coord(xCenter, yCenter);
            } else{
                throw new IllegalArgumentException("Not enough points in cluster " + clusterId + " to calculate a center of gravity!");
            }
        } else{
            /* Use the centroid of the hull.
             * FIXME There is a chance that the hull is an empty geometry. */
            Point centroid = this.concaveHull.getCentroid();
            if(!centroid.isEmpty()){
                centerOfGravity = new Coord(centroid.getX(), centroid.getY());
            } else{
                log.warn("Cannot set centre of gravity for an empty point!!");
                log.debug("   --> Unique facility identifier: " + this.getId().toString());
                log.debug("   --> No centre of gravity set.");
            }
        }
    }

    public Coord getCenterOfGravity() {
        return centerOfGravity;
    }

    public void setClusterId(Id<Cluster> id){
        this.clusterId = id;
    }

    public List<ClusterActivity> getPoints() {
        return activities;
    }

    @Override
    public Id<Cluster> getId() {
        return this.clusterId;
    }

    public void setConcaveHull(Geometry geometry){
        this.concaveHull = geometry;
    }

    public Geometry getConcaveHull(Geometry geometry){
        return this.concaveHull;
    }
}