Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/StaticWKmsArtifact.java @ 3903:0623cdf32b38
Document issue880
flys-artifacts/trunk@5568 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
|---|---|
| date | Sat, 22 Sep 2012 09:55:01 +0000 |
| parents | afc7bfb4800b |
| children | fe70edde0897 |
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| 3902:da48e33f4241 | 3903:0623cdf32b38 |
|---|---|
| 301 * @param prev the previous available input km (-1 if unavailable). | 301 * @param prev the previous available input km (-1 if unavailable). |
| 302 * | 302 * |
| 303 * @return W in wkms that is closer to km than to next and prev, or Double.NaN. | 303 * @return W in wkms that is closer to km than to next and prev, or Double.NaN. |
| 304 */ | 304 */ |
| 305 public double getWAtCloseKm(WKms wkms, double km, double next, double prev) { | 305 public double getWAtCloseKm(WKms wkms, double km, double next, double prev) { |
| 306 // TODO symbolic "-1" pr next/prev is a bad idea (tm), as we compare | |
| 307 // distances to these values later. | |
| 308 // TODO issue888 | |
| 309 | |
| 306 int size = wkms.size(); | 310 int size = wkms.size(); |
| 307 for (int i = 0; i < size; i++) { | 311 for (int i = 0; i < size; i++) { |
| 308 double wkmsKm = wkms.getKm(i); | 312 double wkmsKm = wkms.getKm(i); |
| 309 double dist = Distance.distance(wkmsKm, km); | 313 double dist = Distance.distance(wkmsKm, km); |
| 310 if ((prev == -1d || dist <= Distance.distance(wkmsKm, prev)) | 314 if (dist == 0d) { |
| 311 && (next == -1d || dist <= Distance.distance(wkmsKm, next))) { | 315 return wkms.getW(i); |
| 316 } | |
| 317 | |
| 318 // Problematic Cases: | |
| 319 // X == km , | and | == prev and next, (?) == wkmsKm | |
| 320 // | |
| 321 // Standard case: | |
| 322 // ----------|----X-----|------- | |
| 323 // (1) (2) (3) (4) | |
| 324 // | |
| 325 // With prev==-1 | |
| 326 // -1 ------X-------|------ | |
| 327 // (5) (6) (7) | |
| 328 // | |
| 329 // With next==-1 | |
| 330 // | |
| 331 // ---|-----X----- -1 | |
| 332 // (8) (9) (10) | |
| 333 | |
| 334 if (dist <= Distance.distance(wkmsKm, prev) | |
| 335 && dist <= Distance.distance(wkmsKm, next)) { | |
| 312 return wkms.getW(i); | 336 return wkms.getW(i); |
| 313 } | 337 } |
| 314 } | 338 } |
| 315 | 339 |
| 316 return Double.NaN; | 340 return Double.NaN; |