/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.algorithm;
import com.vividsolutions.jts.geom.*;
/**
* Computes the centroid of a point geometry.
* <h2>Algorithm</h2>
* Compute the average of all points.
*
* @version 1.7
*/
public class CentroidPoint
{
private int ptCount = 0;
private Coordinate centSum = new Coordinate();
public CentroidPoint()
{
}
/**
* Adds the point(s) defined by a Geometry to the centroid total.
* If the geometry is not of dimension 0 it does not contribute to the centroid.
* @param geom the geometry to add
*/
public void add(Geometry geom)
{
if (geom instanceof Point) {
add(geom.getCoordinate());
}
else if (geom instanceof GeometryCollection) {
GeometryCollection gc = (GeometryCollection) geom;
for (int i = 0; i < gc.getNumGeometries(); i++) {
add(gc.getGeometryN(i));
}
}
}
/**
* Adds the length defined by an array of coordinates.
* @param pts an array of {@link Coordinate}s
*/
public void add(Coordinate pt)
{
ptCount += 1;
centSum.x += pt.x;
centSum.y += pt.y;
}
public Coordinate getCentroid()
{
Coordinate cent = new Coordinate();
cent.x = centSum.x / ptCount;
cent.y = centSum.y / ptCount;
return cent;
}
}