Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/L1Comparator.java @ 1138:2c00570ab3bd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
merged doc
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:02 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
1 /*
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
2 * Copyright (c) 2010 by Intevation GmbH
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
3 *
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
4 * This program is free software under the LGPL (>=v2.1)
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
5 * Read the file LGPL.txt coming with the software for details
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
6 * or visit http://www.gnu.org/licenses/ if it does not exist.
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
7 */
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 807
diff changeset
8
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
9 package de.intevation.gnv.math;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
10
779
b1f5f2a8840f Ordered imports. Removed needless imports. Removed empty headers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 474
diff changeset
11 import com.vividsolutions.jts.geom.Coordinate;
b1f5f2a8840f Ordered imports. Removed needless imports. Removed empty headers.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 474
diff changeset
12
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
13 import java.util.Comparator;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
14
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
15 /**
807
a645bd23c1c8 Added more javadoc. Removed trailing whitespace.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 805
diff changeset
16 * Compares two coordinates a and b by their L1(Manhattan) distance
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
17 * relative to a reference point r.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
18 * da = L1(a, r)<br>
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
19 * db = L1(b, r)<br>
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
20 * -1 if da &lt; db, +1 if da &gt; db, 0 else.
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
21 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
22 */
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
23 public class L1Comparator
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
24 implements Comparator
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
25 {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
26 private Coordinate ref;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
27
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
28 /**
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
29 * Default constructor.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
30 */
474
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
31 public L1Comparator() {
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
32 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
33
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
34 /**
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
35 * Constructor to create a L1Comparator with a given reference point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
36 * @param ref The reference point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
37 */
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
38 public L1Comparator(Coordinate ref) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
39 this.ref = ref;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
40 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
41
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
42 /**
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
43 * Explicitly sets the reference point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
44 * @param ref The reference point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
45 */
474
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
46 public void setReference(Coordinate ref) {
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
47 this.ref = ref;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
48 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 361
diff changeset
49
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
50 /**
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
51 * Compares to coordinate by their L1 distance to the reference point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
52 * @param a The first coordinate.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
53 * @param b The second coordinate.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
54 * @return -1 if L1(a, ref) &lt; L1(b, ref),
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
55 * +1 if L1(a, ref) &gt; L1(b, ref), 0 else.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
56 */
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
57 public int compare(Object a, Object b) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
58 Coordinate pa = (Coordinate)a;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
59 Coordinate pb = (Coordinate)b;
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
60 double da = L1(ref, pa);
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
61 double db = L1(ref, pb);
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
62 if (da < db) return -1;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
63 if (da > db) return +1;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
64 return 0;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
65 }
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
66
805
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
67 /**
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
68 * Computes the L1 distance between two points a and b:<br>
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
69 * L1(a, b) = abs(a.x - b.x) + abs(a.y - b.y)
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
70 * @param a The first point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
71 * @param b The second point.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
72 * @return The L1 distance.
bb7afd783321 Removed trailing whitespace. Added more javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 798
diff changeset
73 */
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
74 public static double L1(Coordinate a, Coordinate b) {
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
75 return Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
76 }
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
77 }
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 779
diff changeset
78 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org