| 1 | /*
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| 2 | * The JTS Topology Suite is a collection of Java classes that
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| 3 | * implement the fundamental operations required to validate a given
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| 4 | * geo-spatial data set to a known topological specification.
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| 5 | *
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| 6 | * Copyright (C) 2001 Vivid Solutions
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| 7 | *
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| 8 | * This library is free software; you can redistribute it and/or
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| 9 | * modify it under the terms of the GNU Lesser General Public
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| 10 | * License as published by the Free Software Foundation; either
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| 11 | * version 2.1 of the License, or (at your option) any later version.
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| 12 | *
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| 13 | * This library is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 16 | * Lesser General Public License for more details.
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| 17 | *
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| 18 | * You should have received a copy of the GNU Lesser General Public
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| 19 | * License along with this library; if not, write to the Free Software
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| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 21 | *
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| 22 | * For more information, contact:
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| 23 | *
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| 24 | * Vivid Solutions
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| 25 | * Suite #1A
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| 26 | * 2328 Government Street
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| 27 | * Victoria BC V8T 5G5
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| 28 | * Canada
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| 29 | *
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| 30 | * (250)385-6040
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| 31 | * www.vividsolutions.com
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| 32 | */
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| 33 | package com.vividsolutions.jts.geom;
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| 34 |
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| 35 |
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| 36 | /**
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| 37 | * Utility functions for manipulating {@link CoordinateSequence}s
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| 38 | *
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| 39 | * @version 1.7
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| 40 | */
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| 41 | public class CoordinateSequences {
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| 42 |
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| 43 | /**
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| 44 | * Reverses the coordinates in a sequence in-place.
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| 45 | */
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| 46 | public static void reverse(CoordinateSequence seq)
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| 47 | {
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| 48 | int last = seq.size() - 1;
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| 49 | int mid = last / 2;
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| 50 | for (int i = 0; i <= mid; i++) {
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| 51 | swap(seq, i, last - i);
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| 52 | }
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| 53 | }
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| 54 |
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| 55 | /**
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| 56 | * Swaps two coordinates in a sequence.
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| 57 | *
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| 58 | * @param seq
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| 59 | * @param i
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| 60 | * @param j
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| 61 | */
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| 62 | public static void swap(CoordinateSequence seq, int i, int j)
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| 63 | {
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| 64 | if (i == j) return;
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| 65 | for (int dim = 0; dim < seq.getDimension(); dim++) {
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| 66 | double tmp = seq.getOrdinate(i, dim);
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| 67 | seq.setOrdinate(i, dim, seq.getOrdinate(j, dim));
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| 68 | seq.setOrdinate(j, dim, tmp);
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| 69 | }
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| 70 | }
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| 71 |
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| 72 |
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| 73 |
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| 74 | }
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