/*
* 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.geom;
import java.util.*;
/**
* Utility functions for manipulating {@link CoordinateSequence}s
*
* @version 1.7
*/
public class CoordinateSequences {
/**
* Reverses the coordinates in a sequence in-place.
*/
public static void reverse(CoordinateSequence seq) {
int last = seq.size() - 1;
int mid = last / 2;
for (int i = 0; i <= mid; i++) {
swap(seq, i, last - i);
}
}
/**
* Swaps two coordinates in a sequence.
*
* @param seq
* @param i
* @param j
*/
public static void swap(CoordinateSequence seq, int i, int j) {
if (i == j)
return;
for (int dim = 0; dim < seq.getDimension(); dim++) {
double tmp = seq.getOrdinate(i, dim);
seq.setOrdinate(i, dim, seq.getOrdinate(j, dim));
seq.setOrdinate(j, dim, tmp);
}
}
}