source: josm/trunk/src/org/openstreetmap/josm/data/projection/Projections.java@ 8638

Last change on this file since 8638 was 8533, checked in by Don-vip, 9 years ago

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1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.data.projection;
3
4import java.io.BufferedReader;
5import java.io.IOException;
6import java.io.InputStream;
7import java.io.InputStreamReader;
8import java.nio.charset.StandardCharsets;
9import java.util.ArrayList;
10import java.util.Collection;
11import java.util.Collections;
12import java.util.HashMap;
13import java.util.HashSet;
14import java.util.List;
15import java.util.Locale;
16import java.util.Map;
17import java.util.Set;
18import java.util.regex.Matcher;
19import java.util.regex.Pattern;
20
21import org.openstreetmap.josm.Main;
22import org.openstreetmap.josm.data.coor.EastNorth;
23import org.openstreetmap.josm.data.coor.LatLon;
24import org.openstreetmap.josm.data.projection.datum.Datum;
25import org.openstreetmap.josm.data.projection.datum.GRS80Datum;
26import org.openstreetmap.josm.data.projection.datum.NTV2GridShiftFileWrapper;
27import org.openstreetmap.josm.data.projection.datum.WGS84Datum;
28import org.openstreetmap.josm.data.projection.proj.ClassProjFactory;
29import org.openstreetmap.josm.data.projection.proj.LambertConformalConic;
30import org.openstreetmap.josm.data.projection.proj.LonLat;
31import org.openstreetmap.josm.data.projection.proj.Mercator;
32import org.openstreetmap.josm.data.projection.proj.Proj;
33import org.openstreetmap.josm.data.projection.proj.ProjFactory;
34import org.openstreetmap.josm.data.projection.proj.SwissObliqueMercator;
35import org.openstreetmap.josm.data.projection.proj.TransverseMercator;
36import org.openstreetmap.josm.gui.preferences.projection.ProjectionChoice;
37import org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference;
38import org.openstreetmap.josm.io.CachedFile;
39import org.openstreetmap.josm.tools.Pair;
40import org.openstreetmap.josm.tools.Utils;
41
42/**
43 * Class to handle projections
44 *
45 */
46public final class Projections {
47
48 private Projections() {
49 // Hide default constructor for utils classes
50 }
51
52 public static EastNorth project(LatLon ll) {
53 if (ll == null) return null;
54 return Main.getProjection().latlon2eastNorth(ll);
55 }
56
57 public static LatLon inverseProject(EastNorth en) {
58 if (en == null) return null;
59 return Main.getProjection().eastNorth2latlon(en);
60 }
61
62 /*********************************
63 * Registry for custom projection
64 *
65 * should be compatible to PROJ.4
66 */
67 static final Map<String, ProjFactory> projs = new HashMap<>();
68 static final Map<String, Ellipsoid> ellipsoids = new HashMap<>();
69 static final Map<String, Datum> datums = new HashMap<>();
70 static final Map<String, NTV2GridShiftFileWrapper> nadgrids = new HashMap<>();
71 static final Map<String, Pair<String, String>> inits = new HashMap<>();
72
73 static {
74 registerBaseProjection("lonlat", LonLat.class, "core");
75 registerBaseProjection("josm:smerc", Mercator.class, "core");
76 registerBaseProjection("lcc", LambertConformalConic.class, "core");
77 registerBaseProjection("somerc", SwissObliqueMercator.class, "core");
78 registerBaseProjection("tmerc", TransverseMercator.class, "core");
79
80 ellipsoids.put("airy", Ellipsoid.Airy);
81 ellipsoids.put("mod_airy", Ellipsoid.AiryMod);
82 ellipsoids.put("aust_SA", Ellipsoid.AustSA);
83 ellipsoids.put("bessel", Ellipsoid.Bessel1841);
84 ellipsoids.put("clrk66", Ellipsoid.Clarke1866);
85 ellipsoids.put("clarkeIGN", Ellipsoid.ClarkeIGN);
86 ellipsoids.put("intl", Ellipsoid.Hayford);
87 ellipsoids.put("helmert", Ellipsoid.Helmert);
88 ellipsoids.put("krass", Ellipsoid.Krassowsky);
89 ellipsoids.put("GRS67", Ellipsoid.GRS67);
90 ellipsoids.put("GRS80", Ellipsoid.GRS80);
91 ellipsoids.put("WGS72", Ellipsoid.WGS72);
92 ellipsoids.put("WGS84", Ellipsoid.WGS84);
93
94 datums.put("WGS84", WGS84Datum.INSTANCE);
95 datums.put("GRS80", GRS80Datum.INSTANCE);
96
97 nadgrids.put("BETA2007.gsb", NTV2GridShiftFileWrapper.BETA2007);
98 nadgrids.put("ntf_r93_b.gsb", NTV2GridShiftFileWrapper.ntf_rgf93);
99
100 loadInits();
101 }
102
103 /**
104 * Plugins can register additional base projections.
105 *
106 * @param id The "official" PROJ.4 id. In case the projection is not supported
107 * by PROJ.4, use some prefix, e.g. josm:myproj or gdal:otherproj.
108 * @param fac The base projection factory.
109 * @param origin Multiple plugins may implement the same base projection.
110 * Provide plugin name or similar string, so it be differentiated.
111 */
112 public static void registerBaseProjection(String id, ProjFactory fac, String origin) {
113 projs.put(id, fac);
114 }
115
116 public static void registerBaseProjection(String id, Class<? extends Proj> projClass, String origin) {
117 registerBaseProjection(id, new ClassProjFactory(projClass), origin);
118 }
119
120 public static Proj getBaseProjection(String id) {
121 ProjFactory fac = projs.get(id);
122 if (fac == null) return null;
123 return fac.createInstance();
124 }
125
126 public static Ellipsoid getEllipsoid(String id) {
127 return ellipsoids.get(id);
128 }
129
130 public static Datum getDatum(String id) {
131 return datums.get(id);
132 }
133
134 public static NTV2GridShiftFileWrapper getNTV2Grid(String id) {
135 return nadgrids.get(id);
136 }
137
138 /**
139 * Get the projection definition string for the given id.
140 * @param id the id
141 * @return the string that can be processed by #{link CustomProjection}.
142 * Null, if the id isn't supported.
143 */
144 public static String getInit(String id) {
145 Pair<String, String> r = inits.get(id.toUpperCase(Locale.ENGLISH));
146 if (r == null) return null;
147 return r.b;
148 }
149
150 /**
151 * Load +init "presets" from file
152 */
153 private static void loadInits() {
154 Pattern epsgPattern = Pattern.compile("<(\\d+)>(.*)<>");
155 try (
156 InputStream in = new CachedFile("resource://data/projection/epsg").getInputStream();
157 BufferedReader r = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8));
158 ) {
159 String line, lastline = "";
160 while ((line = r.readLine()) != null) {
161 line = line.trim();
162 if (!line.startsWith("#") && !line.isEmpty()) {
163 if (!lastline.startsWith("#")) throw new AssertionError("EPSG file seems corrupted");
164 String name = lastline.substring(1).trim();
165 Matcher m = epsgPattern.matcher(line);
166 if (m.matches()) {
167 inits.put("EPSG:" + m.group(1), Pair.create(name, m.group(2).trim()));
168 } else {
169 Main.warn("Failed to parse line from the EPSG projection definition: "+line);
170 }
171 }
172 lastline = line;
173 }
174 } catch (IOException ex) {
175 throw new RuntimeException(ex);
176 }
177 }
178
179 private static final Set<String> allCodes = new HashSet<>();
180 private static final Map<String, ProjectionChoice> allProjectionChoicesByCode = new HashMap<>();
181 private static final Map<String, Projection> projectionsByCode_cache = new HashMap<>();
182
183 static {
184 for (ProjectionChoice pc : ProjectionPreference.getProjectionChoices()) {
185 for (String code : pc.allCodes()) {
186 allProjectionChoicesByCode.put(code, pc);
187 }
188 }
189 allCodes.addAll(inits.keySet());
190 allCodes.addAll(allProjectionChoicesByCode.keySet());
191 }
192
193 public static Projection getProjectionByCode(String code) {
194 Projection proj = projectionsByCode_cache.get(code);
195 if (proj != null) return proj;
196 ProjectionChoice pc = allProjectionChoicesByCode.get(code);
197 if (pc != null) {
198 Collection<String> pref = pc.getPreferencesFromCode(code);
199 pc.setPreferences(pref);
200 try {
201 proj = pc.getProjection();
202 } catch (Exception e) {
203 String cause = e.getMessage();
204 Main.warn("Unable to get projection "+code+" with "+pc + (cause != null ? ". "+cause : ""));
205 }
206 }
207 if (proj == null) {
208 Pair<String, String> pair = inits.get(code);
209 if (pair == null) return null;
210 String name = pair.a;
211 String init = pair.b;
212 proj = new CustomProjection(name, code, init, null);
213 }
214 projectionsByCode_cache.put(code, proj);
215 return proj;
216 }
217
218 public static Collection<String> getAllProjectionCodes() {
219 return Collections.unmodifiableCollection(allCodes);
220 }
221
222 private static String listKeys(Map<String, ?> map) {
223 List<String> keys = new ArrayList<>(map.keySet());
224 Collections.sort(keys);
225 return Utils.join(", ", keys);
226 }
227
228 /**
229 * Replies the list of projections as string (comma separated).
230 * @return the list of projections as string (comma separated)
231 * @since 8533
232 */
233 public static String listProjs() {
234 return listKeys(projs);
235 }
236
237 /**
238 * Replies the list of ellipsoids as string (comma separated).
239 * @return the list of ellipsoids as string (comma separated)
240 * @since 8533
241 */
242 public static String listEllipsoids() {
243 return listKeys(ellipsoids);
244 }
245
246 /**
247 * Replies the list of datums as string (comma separated).
248 * @return the list of datums as string (comma separated)
249 * @since 8533
250 */
251 public static String listDatums() {
252 return listKeys(datums);
253 }
254
255 /**
256 * Replies the list of nadgrids as string (comma separated).
257 * @return the list of nadgrids as string (comma separated)
258 * @since 8533
259 */
260 public static String listNadgrids() {
261 return listKeys(nadgrids);
262 }
263}
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