source: osm/applications/editors/josm/plugins/seachart/src/s57/S57map.java@ 31846

Last change on this file since 31846 was 31846, checked in by malcolmh, 9 years ago

[seachart] add jbasemap
File size: 21.1 KB
Line 
1/* Copyright 2014 Malcolm Herring
2 *
3 * This is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, version 3 of the License.
6 *
7 * For a copy of the GNU General Public License, see <http://www.gnu.org/licenses/>.
8 */
9
10package s57;
11
12import java.util.*;
13
14import s57.S57obj;
15import s57.S57obj.*;
16import s57.S57att;
17import s57.S57att.*;
18import s57.S57val;
19import s57.S57val.*;
20import s57.S57osm;
21import s57.S57osm.*;
22
23public class S57map { // S57/OSM map generation methods
24
25 public class MapBounds {
26 public double minlat;
27 public double minlon;
28 public double maxlat;
29 public double maxlon;
30 public MapBounds() {
31 minlat = Math.toRadians(90);
32 minlon = Math.toRadians(180);
33 maxlat = Math.toRadians(-90);
34 maxlon = Math.toRadians(-180);
35 }
36 }
37
38 public enum Nflag {
39 ANON, // Edge inner nodes
40 ISOL, // Node not part of Edge
41 CONN, // Edge first and last nodes
42 TRNK, // Edge truncated polygon nodes
43 DPTH // Sounding nodes
44 }
45
46 public class Snode { // All coordinates in map
47 public double lat; // Latitude in radians
48 public double lon; // Longitude in radians
49 public Nflag flg; // Role of node
50 public double val; // Optional value
51
52 public Snode() {
53 flg = Nflag.ANON;
54 lat = 0;
55 lon = 0;
56 val = 0;
57 }
58 public Snode(double ilat, double ilon) {
59 flg = Nflag.ANON;
60 lat = ilat;
61 lon = ilon;
62 val = 0;
63 }
64 public Snode(double ilat, double ilon, Nflag iflg) {
65 lat = ilat;
66 lon = ilon;
67 flg = iflg;
68 val = 0;
69 }
70 public Snode(double ilat, double ilon, double ival) {
71 flg = Nflag.DPTH;
72 lat = ilat;
73 lon = ilon;
74 val = ival;
75 }
76 }
77
78 public class Edge { // A polyline segment
79 public long first; // First CONN node
80 public long last; // Last CONN node
81 public ArrayList<Long> nodes; // Inner ANON nodes
82
83 public Edge() {
84 first = 0;
85 last = 0;
86 nodes = new ArrayList<Long>();
87 }
88 }
89
90 public enum Rflag {
91 UNKN, MASTER, SLAVE
92 }
93
94 public class Reln {
95 public long id;
96 public Rflag reln;
97 public Reln(long i, Rflag r) {
98 id = i;
99 reln = r;
100 }
101 }
102
103 public class RelTab extends ArrayList<Reln> {
104 public RelTab() {
105 super();
106 }
107 }
108
109 public class ObjTab extends HashMap<Integer, AttMap> {
110 public ObjTab() {
111 super();
112 }
113 }
114
115 public class ObjMap extends EnumMap<Obj, ObjTab> {
116 public ObjMap() {
117 super(Obj.class);
118 }
119 }
120
121 public class AttMap extends HashMap<Att, AttVal<?>> {
122 public AttMap() {
123 super();
124 }
125 }
126
127 public class NodeTab extends HashMap<Long, Snode> {
128 public NodeTab() {
129 super();
130 }
131 }
132
133 public class EdgeTab extends HashMap<Long, Edge> {
134 public EdgeTab() {
135 super();
136 }
137 }
138
139 public class FtrMap extends EnumMap<Obj, ArrayList<Feature>> {
140 public FtrMap() {
141 super(Obj.class);
142 }
143 }
144
145 public class FtrTab extends HashMap<Long, Feature> {
146 public FtrTab() {
147 super();
148 }
149 }
150
151 public class Prim { // Spatial element
152 public long id; // Snode ID for POINTs, Edge ID for LINEs & AREAs)
153 public boolean forward; // Direction of vector used (LINEs & AREAs)
154 public boolean outer; // Exterior/Interior boundary (AREAs)
155 public boolean trunc; // Cell limit truncation
156 public Prim() {
157 id = 0; forward = true; outer = true; trunc = false;
158 }
159 public Prim(long i) {
160 id = i; forward = true; outer = true; trunc = false;
161 }
162 public Prim(long i, boolean o) {
163 id = i; forward = true; outer = o; trunc = false;
164 }
165 public Prim(long i, boolean f, boolean o) {
166 id = i; forward = f; outer = o; trunc = false;
167 }
168 public Prim(long i, boolean f, boolean o, boolean t) {
169 id = i; forward = f; outer = o; trunc = t;
170 }
171 }
172
173 public class Comp { // Composite spatial element
174 public long ref; // ID of Comp
175 public int size; // Number of Prims in this Comp
176 public Comp(long r, int s) {
177 ref = r;
178 size = s;
179 }
180 }
181
182 public enum Pflag {
183 NOSP, POINT, LINE, AREA
184 }
185
186 public class Geom { // Geometric structure of feature
187 public Pflag prim; // Geometry type
188 public ArrayList<Prim> elems; // Ordered list of elements
189 public int outers; // Number of outers
190 public int inners; // Number of inners
191 public ArrayList<Comp> comps; // Ordered list of compounds
192 public double area; // Area of feature
193 public double length; // Length of feature
194 public Snode centre; // Centre of feature
195 public Geom(Pflag p) {
196 prim = p;
197 elems = new ArrayList<>();
198 outers = inners = 0;
199 comps = new ArrayList<>();
200 area = 0;
201 length = 0;
202 centre = new Snode();
203 }
204 }
205
206 public class Feature {
207 public long id; // Ref for this feature
208 public Rflag reln; // Relationship status
209 public Geom geom; // Geometry data
210 public Obj type; // Feature type
211 public AttMap atts; // Feature attributes
212 public RelTab rels; // Related objects
213 public ObjMap objs; // Slave object attributes
214
215 Feature() {
216 id = 0;
217 reln = Rflag.UNKN;
218 geom = new Geom(Pflag.NOSP);
219 type = Obj.UNKOBJ;
220 atts = new AttMap();
221 rels = new RelTab();
222 objs = new ObjMap();
223 }
224 }
225
226 public MapBounds bounds;
227 public NodeTab nodes;
228 public EdgeTab edges;
229 public FtrMap features;
230 public FtrTab index;
231 public long xref;
232
233 private long cref;
234 private Feature feature;
235 private Edge edge;
236 private KeyVal<?> osm = S57osm.OSMtag("", "");
237 private boolean sea;
238
239 public S57map(boolean s) {
240 sea = s;
241 nodes = new NodeTab(); // All nodes in map
242 edges = new EdgeTab(); // All edges in map
243 feature = new Feature(); // Current feature being built
244 features = new FtrMap(); // All features in map, grouped by type
245 index = new FtrTab(); // Feature look-up table
246 bounds = new MapBounds();
247 cref = 0x0000ffffffff0000L;// Compound reference generator
248 xref = 0x0fff000000000000L;// Extras reference generator
249 }
250
251 // S57 map building methods
252
253 public void newNode(long id, double lat, double lon, Nflag flag) {
254 nodes.put(id, new Snode(Math.toRadians(lat), Math.toRadians(lon), flag));
255 if (flag == Nflag.ANON) {
256 edge.nodes.add(id);
257 }
258 }
259
260 public void newNode(long id, double lat, double lon, double depth) {
261 nodes.put(id, new Snode(Math.toRadians(lat), Math.toRadians(lon), depth));
262 }
263
264 public void newFeature(long id, Pflag p, long objl) {
265 feature = new Feature();
266 Obj obj = S57obj.decodeType(objl);
267 feature.geom = new Geom(p);
268 feature.type = obj;
269 if (obj != Obj.UNKOBJ) {
270 index.put(id, feature);
271 feature.id = id;
272 }
273 }
274
275 public void newObj(long id, int rind) {
276 Rflag r = Rflag.UNKN;
277 switch (rind) {
278 case 1:
279 r = Rflag.MASTER;
280 break;
281 case 2:
282 r = Rflag.SLAVE;
283 break;
284 case 3:
285 r = Rflag.UNKN;
286 break;
287 }
288 feature.rels.add(new Reln(id, r));
289 }
290
291 public void endFeature() {
292
293 }
294
295 public void newAtt(long attl, String atvl) {
296 Att att = S57att.decodeAttribute(attl);
297 AttVal<?> val = S57val.decodeValue(atvl, att);
298 feature.atts.put(att, val);
299 }
300
301 public void newPrim(long id, long ornt, long usag) {
302 feature.geom.elems.add(new Prim(id, (ornt != 2), (usag != 2)));
303 }
304
305 public void addConn(long id, int topi) {
306 if (topi == 1) {
307 edge.first = id;
308 } else {
309 edge.last = id;
310 }
311 }
312
313 public void newEdge(long id) {
314 edge = new Edge();
315 edges.put(id, edge);
316 }
317
318 public void endFile() {
319 for (long id : index.keySet()) {
320 Feature feature = index.get(id);
321 sortGeom(feature);
322 for (Reln reln : feature.rels) {
323 Feature rel = index.get(reln.id);
324 if (cmpGeoms(feature.geom, rel.geom)) {
325 switch (reln.reln) {
326 case SLAVE:
327 feature.reln = Rflag.MASTER;
328 break;
329 default:
330 feature.reln = Rflag.UNKN;
331 break;
332 }
333 rel.reln = reln.reln;
334 } else {
335 reln.reln = Rflag.UNKN;
336 }
337 }
338 }
339 for (long id : index.keySet()) {
340 Feature feature = index.get(id);
341 if (feature.reln == Rflag.UNKN) {
342 feature.reln = Rflag.MASTER;
343 }
344 if ((feature.type != Obj.UNKOBJ) && (feature.reln == Rflag.MASTER)) {
345 if (features.get(feature.type) == null) {
346 features.put(feature.type, new ArrayList<Feature>());
347 }
348 features.get(feature.type).add(feature);
349 }
350 }
351 for (long id : index.keySet()) {
352 Feature feature = index.get(id);
353 for (Reln reln : feature.rels) {
354 Feature rel = index.get(reln.id);
355 if (rel.reln == Rflag.SLAVE) {
356 if (feature.objs.get(rel.type) == null) {
357 feature.objs.put(rel.type, new ObjTab());
358 }
359 ObjTab tab = feature.objs.get(rel.type);
360 int ix = tab.size();
361 tab.put(ix, rel.atts);
362 }
363 }
364 }
365 }
366
367 // OSM map building methods
368
369 public void addNode(long id, double lat, double lon) {
370 nodes.put(id, new Snode(Math.toRadians(lat), Math.toRadians(lon)));
371 feature = new Feature();
372 feature.id = id;
373 feature.reln = Rflag.UNKN;
374 feature.geom.prim = Pflag.POINT;
375 feature.geom.elems.add(new Prim(id));
376 edge = null;
377 osm = S57osm.OSMtag("", "");
378 }
379
380 public void addEdge(long id) {
381 feature = new Feature();
382 feature.id = id;
383 feature.reln = Rflag.UNKN;
384 feature.geom.prim = Pflag.LINE;
385 feature.geom.elems.add(new Prim(id));
386 edge = new Edge();
387 osm = S57osm.OSMtag("", "");
388 }
389
390 public void addToEdge(long node) {
391 if (edge.first == 0) {
392 edge.first = node;
393 nodes.get(node).flg = Nflag.CONN;
394 } else {
395 if (edge.last != 0) {
396 edge.nodes.add(edge.last);
397 }
398 edge.last = node;
399 }
400 }
401
402 public void addArea(long id) {
403 feature = new Feature();
404 feature.id = id;
405 feature.reln = Rflag.UNKN;
406 feature.geom.prim = Pflag.AREA;
407 edge = null;
408 osm = S57osm.OSMtag("", "");
409 }
410
411 public void addToArea(long id, boolean outer) {
412 feature.geom.elems.add(new Prim(id, outer));
413 }
414
415 public void addTag(String key, String val) {
416 feature.reln = Rflag.MASTER;
417 String subkeys[] = key.split(":");
418 if ((subkeys.length > 1) && subkeys[0].equals("seamark")) {
419 Obj obj = S57obj.enumType(subkeys[1]);
420 if ((subkeys.length > 2) && (obj != Obj.UNKOBJ)) {
421 int idx = 0;
422 Att att = Att.UNKATT;
423 try {
424 idx = Integer.parseInt(subkeys[2]);
425 if (subkeys.length == 4) {
426 att = s57.S57att.enumAttribute(subkeys[3], obj);
427 }
428 } catch (Exception e) {
429 att = S57att.enumAttribute(subkeys[2], obj);
430 }
431 ObjTab objs = feature.objs.get(obj);
432 if (objs == null) {
433 objs = new ObjTab();
434 feature.objs.put(obj, objs);
435 }
436 AttMap atts = objs.get(idx);
437 if (atts == null) {
438 atts = new AttMap();
439 objs.put(idx, atts);
440 }
441 AttVal<?> attval = S57val.convertValue(val, att);
442 if (attval.val != null) {
443 if (att == Att.VALSOU) {
444 Snode node = nodes.get(feature.geom.elems.get(0).id);
445 node.val = (Double) attval.val;
446 }
447 atts.put(att, attval);
448 }
449 } else {
450 if (subkeys[1].equals("type")) {
451 obj = S57obj.enumType(val);
452 feature.type = obj;
453 ObjTab objs = feature.objs.get(obj);
454 if (objs == null) {
455 objs = new ObjTab();
456 feature.objs.put(obj, objs);
457 }
458 AttMap atts = objs.get(0);
459 if (atts == null) {
460 atts = new AttMap();
461 objs.put(0, atts);
462 }
463 if ((obj == Obj.SOUNDG) && (feature.geom.prim == Pflag.POINT)) {
464 Snode node = nodes.get(feature.geom.elems.get(0).id);
465 node.flg = Nflag.DPTH;
466 }
467 } else {
468 Att att = S57att.enumAttribute(subkeys[1], Obj.UNKOBJ);
469 if (att != Att.UNKATT) {
470 AttVal<?> attval = S57val.convertValue(val, att);
471 if (attval.val != null)
472 feature.atts.put(att, attval);
473 }
474 }
475 }
476 } else if (!sea) {
477 KeyVal<?> kv = S57osm.OSMtag(key, val);
478 if (kv.obj != Obj.UNKOBJ) {
479 osm.obj = kv.obj;
480 if (kv.att != Att.UNKATT) {
481 osm = kv;
482 }
483 }
484 }
485 }
486
487 public void tagsDone(long id) {
488 switch (feature.geom.prim) {
489 case POINT:
490 Snode node = nodes.get(id);
491 if ((node.flg != Nflag.CONN) && (node.flg != Nflag.DPTH) && (!feature.objs.isEmpty() || (osm.obj != Obj.UNKOBJ))) {
492 node.flg = Nflag.ISOL;
493 }
494 break;
495 case LINE:
496 edges.put(id, edge);
497 nodes.get(edge.first).flg = Nflag.CONN;
498 nodes.get(edge.last).flg = Nflag.CONN;
499 if (edge.first == edge.last) {
500 feature.geom.prim = Pflag.AREA;
501 }
502 break;
503 case AREA:
504 break;
505 default:
506 break;
507 }
508 if (sortGeom(feature) && !((edge != null) && (edge.last == 0))) {
509 if (osm.obj != Obj.UNKOBJ) {
510 if (feature.type == Obj.UNKOBJ) {
511 feature.type = osm.obj;
512 ObjTab objs = feature.objs.get(osm.obj);
513 if (objs == null) {
514 objs = new ObjTab();
515 feature.objs.put(osm.obj, objs);
516 }
517 AttMap atts = objs.get(0);
518 if (atts == null) {
519 atts = new AttMap();
520 objs.put(0, atts);
521 }
522 if (osm.att != Att.UNKATT) {
523 atts.put(osm.att, new AttVal<>(osm.conv, osm.val));
524 }
525 } else {
526 Feature base = new Feature();
527 base.reln = Rflag.MASTER;
528 base.geom = feature.geom;
529 base.type = osm.obj;
530 ObjTab objs = new ObjTab();
531 base.objs.put(osm.obj, objs);
532 AttMap atts = new AttMap();
533 objs.put(0, atts);
534 if (osm.att != Att.UNKATT) {
535 atts.put(osm.att, new AttVal<>(osm.conv, osm.val));
536 }
537 index.put(++xref, base);
538 if (features.get(osm.obj) == null) {
539 features.put(osm.obj, new ArrayList<Feature>());
540 }
541 features.get(osm.obj).add(base);
542 }
543 }
544 if (feature.type != Obj.UNKOBJ) {
545 index.put(id, feature);
546 if (features.get(feature.type) == null) {
547 features.put(feature.type, new ArrayList<Feature>());
548 }
549 features.get(feature.type).add(feature);
550 }
551 }
552 }
553
554 public void mapDone() {
555 if (!sea) {
556 S57box.bBox(this);
557 }
558 }
559
560 // Utility methods
561
562 public boolean sortGeom(Feature feature) {
563 Geom sort = new Geom(feature.geom.prim);
564 long first = 0;
565 long last = 0;
566 Comp comp = null;
567 boolean next = true;
568 feature.geom.length = 0;
569 feature.geom.area = 0;
570 if (feature.geom.elems.isEmpty()) {
571 return false;
572 }
573 if (feature.geom.prim == Pflag.POINT) {
574 feature.geom.centre = nodes.get(feature.geom.elems.get(0).id);
575 return true;
576 } else {
577 int sweep = feature.geom.elems.size();
578 while (!feature.geom.elems.isEmpty()) {
579 Prim prim = feature.geom.elems.remove(0);
580 Edge edge = edges.get(prim.id);
581 if (edge == null) {
582 return false;
583 }
584 if (next == true) {
585 next = false;
586 first = edge.first;
587 last = edge.last;
588 prim.forward = true;
589 sort.elems.add(prim);
590 if (prim.outer) {
591 sort.outers++;
592 } else {
593 sort.inners++;
594 }
595 comp = new Comp(cref++, 1);
596 sort.comps.add(comp);
597 } else {
598 if (edge.first == last) {
599 sort.elems.add(prim);
600 last = edge.last;
601 prim.forward = true;
602 comp.size++;
603 } else if (edge.last == first) {
604 sort.elems.add(0, prim);
605 first = edge.first;
606 prim.forward = true;
607 comp.size++;
608 } else if (edge.last == last) {
609 sort.elems.add(prim);
610 last = edge.first;
611 prim.forward = false;
612 comp.size++;
613 } else if (edge.first == first) {
614 sort.elems.add(0, prim);
615 first = edge.last;
616 prim.forward = false;
617 comp.size++;
618 } else {
619 feature.geom.elems.add(prim);
620 }
621 }
622 if (--sweep == 0) {
623 next = true;
624 sweep = feature.geom.elems.size();
625 }
626 }
627 if ((sort.prim == Pflag.LINE) && (sort.outers == 1) && (sort.inners == 0) && (first == last)) {
628 sort.prim = Pflag.AREA;
629 }
630 feature.geom = sort;
631 }
632 if (feature.geom.prim == Pflag.AREA) {
633 int ie = 0;
634 int ic = 0;
635 while (ie < feature.geom.elems.size()) {
636 double area = calcArea(feature.geom, ic);
637 if (ie == 0) feature.geom.area = Math.abs(area) * 3444 * 3444;
638 if (((ie == 0) && (area < 0.0)) || ((ie > 0) && (area >= 0.0))) {
639 ArrayList<Prim> tmp = new ArrayList<>();
640 for (int i = 0; i < feature.geom.comps.get(ic).size; i++) {
641 Prim p = feature.geom.elems.remove(ie);
642 p.forward = !p.forward;
643 tmp.add(0, p);
644 }
645 feature.geom.elems.addAll(ie, tmp);
646 }
647 ie += feature.geom.comps.get(ic).size;
648 ic++;
649 }
650 }
651 feature.geom.length = calcLength(feature.geom);
652 feature.geom.centre = calcCentroid(feature);
653 return true;
654 }
655
656 public boolean cmpGeoms (Geom g1, Geom g2) {
657 return ((g1.prim == g2.prim) && (g1.outers == g2.outers) && (g1.inners == g2.inners) && (g1.elems.size() == g2.elems.size()));
658 }
659
660 public class EdgeIterator {
661 Edge edge;
662 boolean forward;
663 ListIterator<Long> it;
664
665 public EdgeIterator(Edge e, boolean dir) {
666 edge = e;
667 forward = dir;
668 it = null;
669 }
670
671 public boolean hasNext() {
672 return (edge != null);
673 }
674
675 public long nextRef() {
676 long ref = 0;
677 if (forward) {
678 if (it == null) {
679 ref = edge.first;
680 it = edge.nodes.listIterator();
681 } else {
682 if (it.hasNext()) {
683 ref = it.next();
684 } else {
685 ref = edge.last;
686 edge = null;
687 }
688 }
689 } else {
690 if (it == null) {
691 ref = edge.last;
692 it = edge.nodes.listIterator(edge.nodes.size());
693 } else {
694 if (it.hasPrevious()) {
695 ref = it.previous();
696 } else {
697 ref = edge.first;
698 edge = null;
699 }
700 }
701 }
702 return ref;
703 }
704
705 public Snode next() {
706 return nodes.get(nextRef());
707 }
708 }
709
710 public class GeomIterator {
711 Geom geom;
712 Prim prim;
713 EdgeIterator eit;
714 ListIterator<S57map.Prim> ite;
715 ListIterator<Comp> itc;
716 Comp comp;
717 int ec;
718 long lastref;
719
720 public GeomIterator(Geom g) {
721 geom = g;
722 lastref = 0;
723 ite = geom.elems.listIterator();
724 itc = geom.comps.listIterator();
725 }
726
727 public boolean hasComp() {
728 return (itc.hasNext());
729 }
730
731 public long nextComp() {
732 comp = itc.next();
733 ec = comp.size;
734 lastref = 0;
735 return comp.ref;
736 }
737
738 public boolean hasEdge() {
739 return (ec > 0) && ite.hasNext();
740 }
741
742 public long nextEdge() {
743 prim = ite.next();
744 eit = new EdgeIterator(edges.get(prim.id), prim.forward);
745 ec--;
746 return prim.id;
747 }
748
749 public boolean hasNode() {
750 return (eit.hasNext());
751 }
752
753 public long nextRef(boolean all) {
754 long ref = eit.nextRef();
755 if (!all && (ref == lastref)) {
756 ref = eit.nextRef();
757 }
758 lastref = ref;
759 return ref;
760 }
761
762 public long nextRef() {
763 return nextRef(false);
764 }
765
766 public Snode next() {
767 return nodes.get(nextRef());
768 }
769 }
770
771 double calcArea(Geom geom, int comp) {
772 Snode node;
773 double lat, lon, llon, llat;
774 lat = lon = llon = llat = 0;
775 double sigma = 0;
776 GeomIterator git = new GeomIterator(geom);
777 for (int i = 0; i <= comp; i++) {
778 if (git.hasComp()) {
779 git.nextComp();
780 while (git.hasEdge()) {
781 git.nextEdge();
782 while (git.hasNode()) {
783 node = git.next();
784 if (node == null)
785 continue;
786 llon = lon;
787 llat = lat;
788 lat = node.lat;
789 lon = node.lon;
790 sigma += (lon * Math.sin(llat)) - (llon * Math.sin(lat));
791 }
792 }
793 if (i != comp)
794 sigma = lat = lon = llon = llat = 0;
795 }
796 }
797 return sigma / 2.0;
798 }
799
800 double calcLength(Geom geom) {
801 Snode node;
802 double lat, lon, llon, llat;
803 lat = lon = llon = llat = 0;
804 double sigma = 0;
805 boolean first = true;
806 GeomIterator git = new GeomIterator(geom);
807 while (git.hasComp()) {
808 git.nextComp();
809 while (git.hasEdge()) {
810 git.nextEdge();
811 while (git.hasNode()) {
812 node = git.next();
813 if (first) {
814 first = false;
815 lat = node.lat;
816 lon = node.lon;
817 } else if (node != null) {
818 llat = lat;
819 llon = lon;
820 lat = node.lat;
821 lon = node.lon;
822 sigma += Math.acos(Math.sin(lat) * Math.sin(llat) + Math.cos(lat) * Math.cos(llat) * Math.cos(llon - lon));
823 }
824 }
825 }
826 }
827 return sigma * 3444;
828 }
829
830 Snode calcCentroid(Feature feature) {
831 double lat, lon, slat, slon, llat, llon;
832 llat = llon = lat = lon = slat = slon = 0;
833 double sarc = 0;
834 boolean first = true;
835 switch (feature.geom.prim) {
836 case POINT:
837 return nodes.get(feature.geom.elems.get(0).id);
838 case LINE:
839 GeomIterator git = new GeomIterator(feature.geom);
840 while (git.hasComp()) {
841 git.nextComp();
842 while (git.hasEdge()) {
843 git.nextEdge();
844 while (git.hasNode()) {
845 Snode node = git.next();
846 if (node == null) continue;
847 lat = node.lat;
848 lon = node.lon;
849 if (first) {
850 first = false;
851 } else {
852 sarc += (Math.acos(Math.cos(lon - llon) * Math.cos(lat - llat)));
853 }
854 llat = lat;
855 llon = lon;
856 }
857 }
858 }
859 double harc = sarc / 2;
860 sarc = 0;
861 first = true;
862 git = new GeomIterator(feature.geom);
863 while (git.hasComp()) {
864 git.nextComp();
865 while (git.hasEdge()) {
866 git.nextEdge();
867 while (git.hasNode()) {
868 Snode node = git.next();
869 if (node == null) continue;
870 lat = node.lat;
871 lon = node.lon;
872 if (first) {
873 first = false;
874 } else {
875 sarc = (Math.acos(Math.cos(lon - llon) * Math.cos(lat - llat)));
876 if (sarc > harc)
877 break;
878 }
879 harc -= sarc;
880 llat = lat;
881 llon = lon;
882 }
883 }
884 }
885 return new Snode(llat + ((lat - llat) * harc / sarc), llon + ((lon - llon) * harc / sarc));
886 case AREA:
887 git = new GeomIterator(feature.geom);
888 while (git.hasComp()) {
889 git.nextComp();
890 while (git.hasEdge()) {
891 git.nextEdge();
892 while (git.hasNode()) {
893 Snode node = git.next();
894 lat = node.lat;
895 lon = node.lon;
896 if (first) {
897 first = false;
898 } else {
899 double arc = (Math.acos(Math.cos(lon - llon) * Math.cos(lat - llat)));
900 slat += ((lat + llat) / 2 * arc);
901 slon += ((lon + llon) / 2 * arc);
902 sarc += arc;
903 }
904 llon = lon;
905 llat = lat;
906 }
907 }
908 }
909 return new Snode((sarc > 0.0 ? slat / sarc : 0.0), (sarc > 0.0 ? slon / sarc : 0.0));
910 default:
911 }
912 return null;
913 }
914
915}
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