source: josm/trunk/src/org/openstreetmap/josm/gui/MapViewState.java@ 10399

Last change on this file since 10399 was 10399, checked in by Don-vip, 10 years ago

gsoc-core - cleanup forgotten @since xxx
  • Property svn:eol-style set to native
File size: 12.5 KB
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1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.gui;
3
4import java.awt.Container;
5import java.awt.Point;
6import java.awt.geom.AffineTransform;
7import java.awt.geom.Point2D;
8import java.awt.geom.Point2D.Double;
9
10import javax.swing.JComponent;
11
12import org.openstreetmap.josm.Main;
13import org.openstreetmap.josm.data.Bounds;
14import org.openstreetmap.josm.data.ProjectionBounds;
15import org.openstreetmap.josm.data.coor.EastNorth;
16import org.openstreetmap.josm.data.coor.LatLon;
17import org.openstreetmap.josm.data.projection.Projection;
18import org.openstreetmap.josm.gui.download.DownloadDialog;
19
20/**
21 * This class represents a state of the {@link MapView}.
22 * @author Michael Zangl
23 * @since 10343
24 */
25public final class MapViewState {
26
27 private final Projection projection;
28
29 private final int viewWidth;
30 private final int viewHeight;
31
32 private final double scale;
33
34 /**
35 * Top left {@link EastNorth} coordinate of the view.
36 */
37 private final EastNorth topLeft;
38
39 private final Point topLeftOnScreen;
40 private final Point topLeftInWindow;
41
42 /**
43 * Create a new {@link MapViewState}
44 * @param projection The projection to use.
45 * @param viewWidth The view width
46 * @param viewHeight The view height
47 * @param scale The scale to use
48 * @param topLeft The top left corner in east/north space.
49 */
50 private MapViewState(Projection projection, int viewWidth, int viewHeight, double scale, EastNorth topLeft) {
51 this.projection = projection;
52 this.scale = scale;
53 this.topLeft = topLeft;
54
55 this.viewWidth = viewWidth;
56 this.viewHeight = viewHeight;
57 topLeftInWindow = new Point(0, 0);
58 topLeftOnScreen = new Point(0, 0);
59 }
60
61 private MapViewState(EastNorth topLeft, MapViewState mapViewState) {
62 this.projection = mapViewState.projection;
63 this.scale = mapViewState.scale;
64 this.topLeft = topLeft;
65
66 viewWidth = mapViewState.viewWidth;
67 viewHeight = mapViewState.viewHeight;
68 topLeftInWindow = mapViewState.topLeftInWindow;
69 topLeftOnScreen = mapViewState.topLeftOnScreen;
70 }
71
72 private MapViewState(double scale, MapViewState mapViewState) {
73 this.projection = mapViewState.projection;
74 this.scale = scale;
75 this.topLeft = mapViewState.topLeft;
76
77 viewWidth = mapViewState.viewWidth;
78 viewHeight = mapViewState.viewHeight;
79 topLeftInWindow = mapViewState.topLeftInWindow;
80 topLeftOnScreen = mapViewState.topLeftOnScreen;
81 }
82
83 private MapViewState(JComponent position, MapViewState mapViewState) {
84 this.projection = mapViewState.projection;
85 this.scale = mapViewState.scale;
86 this.topLeft = mapViewState.topLeft;
87
88 viewWidth = position.getWidth();
89 viewHeight = position.getHeight();
90 topLeftInWindow = new Point();
91 // better than using swing utils, since this allows us to use the mehtod if no screen is present.
92 Container component = position;
93 while (component != null) {
94 topLeftInWindow.x += component.getX();
95 topLeftInWindow.y += component.getY();
96 component = component.getParent();
97 }
98 topLeftOnScreen = position.getLocationOnScreen();
99 }
100
101 /**
102 * The scale in east/north units per pixel.
103 * @return The scale.
104 */
105 public double getScale() {
106 return scale;
107 }
108
109 /**
110 * Gets the MapViewPoint representation for a position in view coordinates.
111 * @param x The x coordinate inside the view.
112 * @param y The y coordinate inside the view.
113 * @return The MapViewPoint.
114 */
115 public MapViewPoint getForView(double x, double y) {
116 return new MapViewViewPoint(x, y);
117 }
118
119 /**
120 * Gets the {@link MapViewPoint} for the given {@link EastNorth} coordinate.
121 * @param eastNorth the position.
122 * @return The point for that position.
123 */
124 public MapViewPoint getPointFor(EastNorth eastNorth) {
125 return new MapViewEastNorthPoint(eastNorth);
126 }
127
128 /**
129 * Gets a rectangle representing the whole view area.
130 * @return The rectangle.
131 */
132 public MapViewRectangle getViewArea() {
133 return getForView(0, 0).rectTo(getForView(viewWidth, viewHeight));
134 }
135
136 /**
137 * Gets the center of the view.
138 * @return The center position.
139 */
140 public MapViewPoint getCenter() {
141 return getForView(viewWidth / 2.0, viewHeight / 2.0);
142 }
143
144 /**
145 * Gets the width of the view on the Screen;
146 * @return The width of the view component in screen pixel.
147 */
148 public double getViewWidth() {
149 return viewWidth;
150 }
151
152 /**
153 * Gets the height of the view on the Screen;
154 * @return The height of the view component in screen pixel.
155 */
156 public double getViewHeight() {
157 return viewHeight;
158 }
159
160 /**
161 * Gets the current projection used for the MapView.
162 * @return The projection.
163 */
164 public Projection getProjection() {
165 return projection;
166 }
167
168 /**
169 * Creates an affine transform that is used to convert the east/north coordinates to view coordinates.
170 * @return The affine transform. It should not be changed.
171 * @since 10375
172 */
173 public AffineTransform getAffineTransform() {
174 return new AffineTransform(1.0 / scale, 0.0, 0.0, -1.0 / scale, -topLeft.east() / scale,
175 topLeft.north() / scale);
176 }
177
178 /**
179 * Creates a new state that is the same as the current state except for that it is using a new center.
180 * @param newCenter The new center coordinate.
181 * @return The new state.
182 * @since 10375
183 */
184 public MapViewState usingCenter(EastNorth newCenter) {
185 return movedTo(getCenter(), newCenter);
186 }
187
188 /**
189 * @param mapViewPoint The reference point.
190 * @param newEastNorthThere The east/north coordinate that should be there.
191 * @return The new state.
192 * @since 10375
193 */
194 public MapViewState movedTo(MapViewPoint mapViewPoint, EastNorth newEastNorthThere) {
195 EastNorth delta = newEastNorthThere.subtract(mapViewPoint.getEastNorth());
196 if (delta.distanceSq(0, 0) < .000001) {
197 return this;
198 } else {
199 return new MapViewState(topLeft.add(delta), this);
200 }
201 }
202
203 /**
204 * Creates a new state that is the same as the current state except for that it is using a new scale.
205 * @param newScale The new scale to use.
206 * @return The new state.
207 * @since 10375
208 */
209 public MapViewState usingScale(double newScale) {
210 return new MapViewState(newScale, this);
211 }
212
213 /**
214 * Creates a new state that is the same as the current state except for that it is using the location of the given component.
215 * <p>
216 * The view is moved so that the center is the same as the old center.
217 * @param positon The new location to use.
218 * @return The new state.
219 * @since 10375
220 */
221 public MapViewState usingLocation(JComponent positon) {
222 EastNorth center = this.getCenter().getEastNorth();
223 return new MapViewState(positon, this).usingCenter(center);
224 }
225
226 /**
227 * Create the default {@link MapViewState} object for the given map view. The screen position won't be set so that this method can be used
228 * before the view was added to the hirarchy.
229 * @param width The view width
230 * @param height The view height
231 * @return The state
232 * @since 10375
233 */
234 public static MapViewState createDefaultState(int width, int height) {
235 Projection projection = Main.getProjection();
236 double scale = projection.getDefaultZoomInPPD();
237 MapViewState state = new MapViewState(projection, width, height, scale, new EastNorth(0, 0));
238 EastNorth center = calculateDefaultCenter();
239 return state.movedTo(state.getCenter(), center);
240 }
241
242 private static EastNorth calculateDefaultCenter() {
243 Bounds b = DownloadDialog.getSavedDownloadBounds();
244 if (b == null) {
245 b = Main.getProjection().getWorldBoundsLatLon();
246 }
247 return Main.getProjection().latlon2eastNorth(b.getCenter());
248 }
249
250 /**
251 * A class representing a point in the map view. It allows to convert between the different coordinate systems.
252 * @author Michael Zangl
253 */
254 public abstract class MapViewPoint {
255
256 /**
257 * Get this point in view coordinates.
258 * @return The point in view coordinates.
259 */
260 public Point2D getInView() {
261 return new Point2D.Double(getInViewX(), getInViewY());
262 }
263
264 protected abstract double getInViewX();
265
266 protected abstract double getInViewY();
267
268 /**
269 * Convert this point to window coordinates.
270 * @return The point in window coordinates.
271 */
272 public Point2D getInWindow() {
273 return getUsingCorner(topLeftInWindow);
274 }
275
276 /**
277 * Convert this point to screen coordinates.
278 * @return The point in screen coordinates.
279 */
280 public Point2D getOnScreen() {
281 return getUsingCorner(topLeftOnScreen);
282 }
283
284 private Double getUsingCorner(Point corner) {
285 return new Point2D.Double(corner.getX() + getInViewX(), corner.getY() + getInViewY());
286 }
287
288 /**
289 * Gets the {@link EastNorth} coordinate of this point.
290 * @return The east/north coordinate.
291 */
292 public EastNorth getEastNorth() {
293 return new EastNorth(topLeft.east() + getInViewX() * scale, topLeft.north() - getInViewY() * scale);
294 }
295
296 /**
297 * Create a rectangle from this to the other point.
298 * @param other The other point. Needs to be of the same {@link MapViewState}
299 * @return A rectangle.
300 */
301 public MapViewRectangle rectTo(MapViewPoint other) {
302 return new MapViewRectangle(this, other);
303 }
304
305 /**
306 * Gets the current position in LatLon coordinates according to the current projection.
307 * @return The positon as LatLon.
308 */
309 public LatLon getLatLon() {
310 return projection.eastNorth2latlon(getEastNorth());
311 }
312 }
313
314 private class MapViewViewPoint extends MapViewPoint {
315 private final double x;
316 private final double y;
317
318 MapViewViewPoint(double x, double y) {
319 this.x = x;
320 this.y = y;
321 }
322
323 @Override
324 protected double getInViewX() {
325 return x;
326 }
327
328 @Override
329 protected double getInViewY() {
330 return y;
331 }
332
333 @Override
334 public String toString() {
335 return "MapViewViewPoint [x=" + x + ", y=" + y + "]";
336 }
337 }
338
339 private class MapViewEastNorthPoint extends MapViewPoint {
340
341 private final EastNorth eastNorth;
342
343 MapViewEastNorthPoint(EastNorth eastNorth) {
344 this.eastNorth = eastNorth;
345 }
346
347 @Override
348 protected double getInViewX() {
349 return (eastNorth.east() - topLeft.east()) / scale;
350 }
351
352 @Override
353 protected double getInViewY() {
354 return (topLeft.north() - eastNorth.north()) / scale;
355 }
356
357 @Override
358 public EastNorth getEastNorth() {
359 return eastNorth;
360 }
361
362 @Override
363 public String toString() {
364 return "MapViewEastNorthPoint [eastNorth=" + eastNorth + "]";
365 }
366 }
367
368 /**
369 * A rectangle on the MapView. It is rectangular in screen / EastNorth space.
370 * @author Michael Zangl
371 */
372 public class MapViewRectangle {
373 private final MapViewPoint p1;
374 private final MapViewPoint p2;
375
376 /**
377 * Create a new MapViewRectangle
378 * @param p1 The first point to use
379 * @param p2 The second point to use.
380 */
381 MapViewRectangle(MapViewPoint p1, MapViewPoint p2) {
382 this.p1 = p1;
383 this.p2 = p2;
384 }
385
386 /**
387 * Gets the projection bounds for this rectangle.
388 * @return The projection bounds.
389 */
390 public ProjectionBounds getProjectionBounds() {
391 ProjectionBounds b = new ProjectionBounds(p1.getEastNorth());
392 b.extend(p2.getEastNorth());
393 return b;
394 }
395
396 /**
397 * Gets a rough estimate of the bounds by assuming lat/lon are parallel to x/y.
398 * @return The bounds computed by converting the corners of this rectangle.
399 */
400 public Bounds getCornerBounds() {
401 Bounds b = new Bounds(p1.getLatLon());
402 b.extend(p2.getLatLon());
403 return b;
404 }
405 }
406
407}
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