1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.data.projection;
|
---|
3 |
|
---|
4 | import java.util.Collections;
|
---|
5 | import java.util.HashMap;
|
---|
6 | import java.util.Map;
|
---|
7 | import java.util.function.DoubleUnaryOperator;
|
---|
8 |
|
---|
9 | import org.openstreetmap.josm.data.Bounds;
|
---|
10 | import org.openstreetmap.josm.data.ProjectionBounds;
|
---|
11 | import org.openstreetmap.josm.data.coor.EastNorth;
|
---|
12 | import org.openstreetmap.josm.data.coor.LatLon;
|
---|
13 | import org.openstreetmap.josm.data.projection.datum.Datum;
|
---|
14 | import org.openstreetmap.josm.data.projection.proj.Proj;
|
---|
15 | import org.openstreetmap.josm.tools.Utils;
|
---|
16 |
|
---|
17 | /**
|
---|
18 | * Implementation of the Projection interface that represents a coordinate reference system and delegates
|
---|
19 | * the real projection and datum conversion to other classes.
|
---|
20 | *
|
---|
21 | * It handles false easting and northing, central meridian and general scale factor before calling the
|
---|
22 | * delegate projection.
|
---|
23 | *
|
---|
24 | * Forwards lat/lon values to the real projection in units of radians.
|
---|
25 | *
|
---|
26 | * The fields are named after Proj.4 parameters.
|
---|
27 | *
|
---|
28 | * Subclasses of AbstractProjection must set ellps and proj to a non-null value.
|
---|
29 | * In addition, either datum or nadgrid has to be initialized to some value.
|
---|
30 | */
|
---|
31 | public abstract class AbstractProjection implements Projection {
|
---|
32 |
|
---|
33 | protected Ellipsoid ellps;
|
---|
34 | protected Datum datum;
|
---|
35 | protected Proj proj;
|
---|
36 | protected double x0; /* false easting (in meters) */
|
---|
37 | protected double y0; /* false northing (in meters) */
|
---|
38 | protected double lon0; /* central meridian */
|
---|
39 | protected double pm; /* prime meridian */
|
---|
40 | protected double k0 = 1.0; /* general scale factor */
|
---|
41 | protected double toMeter = 1.0; /* switch from meters to east/north coordinate units */
|
---|
42 |
|
---|
43 | private volatile ProjectionBounds projectionBoundsBox;
|
---|
44 |
|
---|
45 | /**
|
---|
46 | * Get the base ellipsoid that this projection uses.
|
---|
47 | * @return The {@link Ellipsoid}
|
---|
48 | */
|
---|
49 | public final Ellipsoid getEllipsoid() {
|
---|
50 | return ellps;
|
---|
51 | }
|
---|
52 |
|
---|
53 | /**
|
---|
54 | * Gets the datum this projection is based on.
|
---|
55 | * @return The datum
|
---|
56 | */
|
---|
57 | public final Datum getDatum() {
|
---|
58 | return datum;
|
---|
59 | }
|
---|
60 |
|
---|
61 | /**
|
---|
62 | * Replies the projection (in the narrow sense)
|
---|
63 | * @return The projection object
|
---|
64 | */
|
---|
65 | public final Proj getProj() {
|
---|
66 | return proj;
|
---|
67 | }
|
---|
68 |
|
---|
69 | /**
|
---|
70 | * Gets an east offset that gets applied when converting the coordinate
|
---|
71 | * @return The offset to apply in meter
|
---|
72 | */
|
---|
73 | public final double getFalseEasting() {
|
---|
74 | return x0;
|
---|
75 | }
|
---|
76 |
|
---|
77 | /**
|
---|
78 | * Gets an north offset that gets applied when converting the coordinate
|
---|
79 | * @return The offset to apply in meter
|
---|
80 | */
|
---|
81 | public final double getFalseNorthing() {
|
---|
82 | return y0;
|
---|
83 | }
|
---|
84 |
|
---|
85 | /**
|
---|
86 | * Gets the meridian that this projection is centered on.
|
---|
87 | * @return The longitude of the meridian.
|
---|
88 | */
|
---|
89 | public final double getCentralMeridian() {
|
---|
90 | return lon0;
|
---|
91 | }
|
---|
92 |
|
---|
93 | public final double getScaleFactor() {
|
---|
94 | return k0;
|
---|
95 | }
|
---|
96 |
|
---|
97 | /**
|
---|
98 | * Get the factor that converts meters to intended units of east/north coordinates.
|
---|
99 | *
|
---|
100 | * For projected coordinate systems, the semi-major axis of the ellipsoid is
|
---|
101 | * always given in meters, which means the preliminary projection result will
|
---|
102 | * be in meters as well. This factor is used to convert to the intended units
|
---|
103 | * of east/north coordinates (e.g. feet in the US).
|
---|
104 | *
|
---|
105 | * For geographic coordinate systems, the preliminary "projection" result will
|
---|
106 | * be in degrees, so there is no reason to convert anything and this factor
|
---|
107 | * will by 1 by default.
|
---|
108 | *
|
---|
109 | * @return factor that converts meters to intended units of east/north coordinates
|
---|
110 | */
|
---|
111 | public final double getToMeter() {
|
---|
112 | return toMeter;
|
---|
113 | }
|
---|
114 |
|
---|
115 | @Override
|
---|
116 | public EastNorth latlon2eastNorth(LatLon ll) {
|
---|
117 | ll = datum.fromWGS84(ll);
|
---|
118 | double[] en = proj.project(Utils.toRadians(ll.lat()), Utils.toRadians(LatLon.normalizeLon(ll.lon() - lon0 - pm)));
|
---|
119 | return new EastNorth((ellps.a * k0 * en[0] + x0) / toMeter, (ellps.a * k0 * en[1] + y0) / toMeter);
|
---|
120 | }
|
---|
121 |
|
---|
122 | @Override
|
---|
123 | public LatLon eastNorth2latlon(EastNorth en) {
|
---|
124 | return eastNorth2latlon(en, LatLon::normalizeLon);
|
---|
125 | }
|
---|
126 |
|
---|
127 | @Override
|
---|
128 | public LatLon eastNorth2latlonClamped(EastNorth en) {
|
---|
129 | LatLon ll = eastNorth2latlon(en, lon -> Utils.clamp(lon, -180, 180));
|
---|
130 | Bounds bounds = getWorldBoundsLatLon();
|
---|
131 | return new LatLon(Utils.clamp(ll.lat(), bounds.getMinLat(), bounds.getMaxLat()),
|
---|
132 | Utils.clamp(ll.lon(), bounds.getMinLon(), bounds.getMaxLon()));
|
---|
133 | }
|
---|
134 |
|
---|
135 | private LatLon eastNorth2latlon(EastNorth en, DoubleUnaryOperator normalizeLon) {
|
---|
136 | double[] latlonRad = proj.invproject((en.east() * toMeter - x0) / ellps.a / k0, (en.north() * toMeter - y0) / ellps.a / k0);
|
---|
137 | double lon = Utils.toDegrees(latlonRad[1]) + lon0 + pm;
|
---|
138 | LatLon ll = new LatLon(Utils.toDegrees(latlonRad[0]), normalizeLon.applyAsDouble(lon));
|
---|
139 | return datum.toWGS84(ll);
|
---|
140 | }
|
---|
141 |
|
---|
142 | @Override
|
---|
143 | public Map<ProjectionBounds, Projecting> getProjectingsForArea(ProjectionBounds area) {
|
---|
144 | if (proj.lonIsLinearToEast()) {
|
---|
145 | //FIXME: Respect datum?
|
---|
146 | // wrap the wrold around
|
---|
147 | Bounds bounds = getWorldBoundsLatLon();
|
---|
148 | double minEast = latlon2eastNorth(bounds.getMin()).east();
|
---|
149 | double maxEast = latlon2eastNorth(bounds.getMax()).east();
|
---|
150 | double dEast = maxEast - minEast;
|
---|
151 | if ((area.minEast < minEast || area.maxEast > maxEast) && dEast > 0) {
|
---|
152 | // We could handle the dEast < 0 case but we don't need it atm.
|
---|
153 | int minChunk = (int) Math.floor((area.minEast - minEast) / dEast);
|
---|
154 | int maxChunk = (int) Math.floor((area.maxEast - minEast) / dEast);
|
---|
155 | HashMap<ProjectionBounds, Projecting> ret = new HashMap<>();
|
---|
156 | for (int chunk = minChunk; chunk <= maxChunk; chunk++) {
|
---|
157 | ret.put(new ProjectionBounds(Math.max(area.minEast, minEast + chunk * dEast), area.minNorth,
|
---|
158 | Math.min(area.maxEast, maxEast + chunk * dEast), area.maxNorth),
|
---|
159 | new ShiftedProjecting(this, new EastNorth(-chunk * dEast, 0)));
|
---|
160 | }
|
---|
161 | return ret;
|
---|
162 | }
|
---|
163 | }
|
---|
164 |
|
---|
165 | return Collections.singletonMap(area, this);
|
---|
166 | }
|
---|
167 |
|
---|
168 | @Override
|
---|
169 | public double getDefaultZoomInPPD() {
|
---|
170 | // this will set the map scaler to about 1000 m
|
---|
171 | return 10 / getMetersPerUnit();
|
---|
172 | }
|
---|
173 |
|
---|
174 | /**
|
---|
175 | * @return The EPSG Code of this CRS, null if it doesn't have one.
|
---|
176 | */
|
---|
177 | public abstract Integer getEpsgCode();
|
---|
178 |
|
---|
179 | /**
|
---|
180 | * Default implementation of toCode().
|
---|
181 | * Should be overridden, if there is no EPSG code for this CRS.
|
---|
182 | */
|
---|
183 | @Override
|
---|
184 | public String toCode() {
|
---|
185 | return "EPSG:" + getEpsgCode();
|
---|
186 | }
|
---|
187 |
|
---|
188 | protected static final double convertMinuteSecond(double minute, double second) {
|
---|
189 | return (minute/60.0) + (second/3600.0);
|
---|
190 | }
|
---|
191 |
|
---|
192 | protected static final double convertDegreeMinuteSecond(double degree, double minute, double second) {
|
---|
193 | return degree + (minute/60.0) + (second/3600.0);
|
---|
194 | }
|
---|
195 |
|
---|
196 | @Override
|
---|
197 | public final ProjectionBounds getWorldBoundsBoxEastNorth() {
|
---|
198 | ProjectionBounds result = projectionBoundsBox;
|
---|
199 | if (result == null) {
|
---|
200 | synchronized (this) {
|
---|
201 | result = projectionBoundsBox;
|
---|
202 | if (result == null) {
|
---|
203 | Bounds b = getWorldBoundsLatLon();
|
---|
204 | // add 4 corners
|
---|
205 | result = new ProjectionBounds(latlon2eastNorth(b.getMin()));
|
---|
206 | result.extend(latlon2eastNorth(b.getMax()));
|
---|
207 | result.extend(latlon2eastNorth(new LatLon(b.getMinLat(), b.getMaxLon())));
|
---|
208 | result.extend(latlon2eastNorth(new LatLon(b.getMaxLat(), b.getMinLon())));
|
---|
209 | // and trace along the outline
|
---|
210 | double dLon = (b.getMaxLon() - b.getMinLon()) / 1000;
|
---|
211 | double dLat = (b.getMaxLat() - b.getMinLat()) / 1000;
|
---|
212 | for (double lon = b.getMinLon(); lon < b.getMaxLon(); lon += dLon) {
|
---|
213 | result.extend(latlon2eastNorth(new LatLon(b.getMinLat(), lon)));
|
---|
214 | result.extend(latlon2eastNorth(new LatLon(b.getMaxLat(), lon)));
|
---|
215 | }
|
---|
216 | for (double lat = b.getMinLat(); lat < b.getMaxLat(); lat += dLat) {
|
---|
217 | result.extend(latlon2eastNorth(new LatLon(lat, b.getMinLon())));
|
---|
218 | result.extend(latlon2eastNorth(new LatLon(lat, b.getMaxLon())));
|
---|
219 | }
|
---|
220 | projectionBoundsBox = result;
|
---|
221 | }
|
---|
222 | }
|
---|
223 | }
|
---|
224 | return projectionBoundsBox;
|
---|
225 | }
|
---|
226 |
|
---|
227 | @Override
|
---|
228 | public Projection getBaseProjection() {
|
---|
229 | return this;
|
---|
230 | }
|
---|
231 | }
|
---|