Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearMetrics.java @ 657:af3f56758f59
merged gnv-artifacts/0.5
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:53 +0200 |
| parents | aec85d00d82c |
| children | 6cff63d0c434 |
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| 590:5f5f273c8566 | 657:af3f56758f59 |
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| 1 package de.intevation.gnv.math; | |
| 2 | |
| 3 import com.vividsolutions.jts.geom.Coordinate; | |
| 4 | |
| 5 /** | |
| 6 * @author Sascha L. Teichmann | |
| 7 */ | |
| 8 public final class LinearMetrics | |
| 9 implements Metrics | |
| 10 { | |
| 11 public static final Metrics INSTANCE = | |
| 12 new LinearMetrics(); | |
| 13 | |
| 14 public static final class LinearInterpolator | |
| 15 implements Interpolator | |
| 16 { | |
| 17 private double mx; | |
| 18 private double bx; | |
| 19 private double my; | |
| 20 private double by; | |
| 21 | |
| 22 public LinearInterpolator(Coordinate p1, Coordinate p2) { | |
| 23 | |
| 24 /* | |
| 25 I) p1.x = 0*m + bx | |
| 26 II) p2.x = 1*m + bx | |
| 27 | |
| 28 bx = p1.x | |
| 29 | |
| 30 p2.x = m + p1.x | |
| 31 | |
| 32 mx = p2.x - p1.x | |
| 33 */ | |
| 34 | |
| 35 bx = p1.x; | |
| 36 mx = p2.x - bx; | |
| 37 | |
| 38 by = p1.y; | |
| 39 my = p2.y - by; | |
| 40 } | |
| 41 | |
| 42 public void interpolate(double t, Coordinate v) { | |
| 43 v.x = t*mx + bx; | |
| 44 v.y = t*my + by; | |
| 45 } | |
| 46 } // class LinearInterpolator | |
| 47 | |
| 48 private LinearMetrics() { | |
| 49 } | |
| 50 | |
| 51 public double distance(Coordinate p1, Coordinate p2) { | |
| 52 return p1.distance(p2); | |
| 53 } | |
| 54 | |
| 55 public Interpolator getInterpolator(Coordinate p1, Coordinate p2) { | |
| 56 return new LinearInterpolator(p1, p2); | |
| 57 } | |
| 58 } | |
| 59 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |