1 /*******************************************************************************
2 * Copyright (c) 2000, 2017 IBM Corporation and others.
3 *
4 * This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License 2.0
6 * which accompanies this distribution, and is available at
7 * https://www.eclipse.org/legal/epl-2.0/
8 *
9 * SPDX-License-Identifier: EPL-2.0
10 *
11 * Contributors:
12 * IBM Corporation - initial API and implementation
13 *******************************************************************************/
14 package org.eclipse.swt.graphics;
15
16
17 import org.eclipse.swt.*;
18 import org.eclipse.swt.internal.*;
19 import org.eclipse.swt.internal.cocoa.*;
20
21 /**
22 * Instances of this class represent areas of an x-y coordinate
23 * system that are aggregates of the areas covered by a number
24 * of polygons.
25 * <p>
26 * Application code must explicitly invoke the <code>Region.dispose()</code>
27 * method to release the operating system resources managed by each instance
28 * when those instances are no longer required.
29 * </p>
30 *
31 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
32 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
33 */
34 public final class Region extends Resource {
35 /**
36 * the OS resource for the region
37 * (Warning: This field is platform dependent)
38 * <p>
39 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
40 * public API. It is marked public only so that it can be shared
41 * within the packages provided by SWT. It is not available on all
42 * platforms and should never be accessed from application code.
43 * </p>
44 *
45 * @noreference This field is not intended to be referenced by clients.
46 */
47 public long handle;
48
49 /**
50 * Constructs a new empty region.
51 * <p>
52 * You must dispose the region when it is no longer required.
53 * </p>
54 *
55 * @exception SWTError <ul>
56 * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li>
57 * </ul>
58 *
59 * @see #dispose()
60 */
Region()61 public Region() {
62 this(null);
63 }
64
65 /**
66 * Constructs a new empty region.
67 * <p>
68 * You must dispose the region when it is no longer required.
69 * </p>
70 *
71 * @param device the device on which to allocate the region
72 *
73 * @exception IllegalArgumentException <ul>
74 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
75 * </ul>
76 * @exception SWTError <ul>
77 * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li>
78 * </ul>
79 *
80 * @see #dispose()
81 *
82 * @since 3.0
83 */
Region(Device device)84 public Region(Device device) {
85 super(device);
86 NSAutoreleasePool pool = null;
87 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
88 try {
89 handle = OS.NewRgn();
90 if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
91 init();
92 } finally {
93 if (pool != null) pool.release();
94 }
95 }
96
Region(Device device, long handle)97 Region(Device device, long handle) {
98 super(device);
99 this.handle = handle;
100 }
101
102 /**
103 * Invokes platform specific functionality to allocate a new region.
104 * <p>
105 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
106 * API for <code>Region</code>. It is marked public only so that it
107 * can be shared within the packages provided by SWT. It is not
108 * available on all platforms, and should never be called from
109 * application code.
110 * </p>
111 *
112 * @param device the device on which to allocate the region
113 * @param handle the handle for the region
114 * @return a new region object containing the specified device and handle
115 *
116 * @noreference This method is not intended to be referenced by clients.
117 */
cocoa_new(Device device, long handle)118 public static Region cocoa_new(Device device, long handle) {
119 return new Region(device, handle);
120 }
121
polyToRgn(int[] poly, int length)122 static long polyToRgn(int[] poly, int length) {
123 short[] r = new short[4];
124 long polyRgn = OS.NewRgn(), rectRgn = OS.NewRgn();
125 int minY = poly[1], maxY = poly[1];
126 for (int y = 3; y < length; y += 2) {
127 if (poly[y] < minY) minY = poly[y];
128 if (poly[y] > maxY) maxY = poly[y];
129 }
130 int[] inter = new int[length + 1];
131 for (int y = minY; y <= maxY; y++) {
132 int count = 0;
133 int x1 = poly[0], y1 = poly[1];
134 for (int p = 2; p < length; p += 2) {
135 int x2 = poly[p], y2 = poly[p + 1];
136 if (y1 != y2 && ((y1 <= y && y < y2) || (y2 <= y && y < y1))) {
137 inter[count++] = (int)((((y - y1) / (float)(y2 - y1)) * (x2 - x1)) + x1 + 0.5f);
138 }
139 x1 = x2;
140 y1 = y2;
141 }
142 int x2 = poly[0], y2 = poly[1];
143 if (y1 != y2 && ((y1 <= y && y < y2) || (y2 <= y && y < y1))) {
144 inter[count++] = (int)((((y - y1) / (float)(y2 - y1)) * (x2 - x1)) + x1 + 0.5f);
145 }
146 for (int gap=count/2; gap>0; gap/=2) {
147 for (int i=gap; i<count; i++) {
148 for (int j=i-gap; j>=0; j-=gap) {
149 if ((inter[j] - inter[j + gap]) <= 0)
150 break;
151 int temp = inter[j];
152 inter[j] = inter[j + gap];
153 inter[j + gap] = temp;
154 }
155 }
156 }
157 for (int i = 0; i < count; i += 2) {
158 OS.SetRect(r, (short)inter[i], (short)y, (short)(inter[i + 1]),(short)(y + 1));
159 OS.RectRgn(rectRgn, r);
160 OS.UnionRgn(polyRgn, rectRgn, polyRgn);
161 }
162 }
163 OS.DisposeRgn(rectRgn);
164 return polyRgn;
165 }
166
polyRgn(int[] pointArray, int count)167 static long polyRgn(int[] pointArray, int count) {
168 NSAutoreleasePool pool = null;
169 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
170 try {
171 long polyRgn;
172 if (C.PTR_SIZEOF == 4) {
173 polyRgn = OS.NewRgn();
174 OS.OpenRgn();
175 OS.MoveTo((short)pointArray[0], (short)pointArray[1]);
176 for (int i = 1; i < count / 2; i++) {
177 OS.LineTo((short)pointArray[2 * i], (short)pointArray[2 * i + 1]);
178 }
179 OS.LineTo((short)pointArray[0], (short)pointArray[1]);
180 OS.CloseRgn(polyRgn);
181 } else {
182 polyRgn = polyToRgn(pointArray, count);
183 }
184 return polyRgn;
185 } finally {
186 if (pool != null) pool.release();
187 }
188 }
189
190 /**
191 * Adds the given polygon to the collection of polygons
192 * the receiver maintains to describe its area.
193 *
194 * @param pointArray points that describe the polygon to merge with the receiver
195 *
196 * @exception IllegalArgumentException <ul>
197 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
198 * </ul>
199 * @exception SWTException <ul>
200 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
201 * </ul>
202 *
203 * @since 3.0
204 *
205 */
add(int[] pointArray)206 public void add (int[] pointArray) {
207 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
208 if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
209 NSAutoreleasePool pool = null;
210 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
211 try {
212 add(pointArray, pointArray.length);
213 } finally {
214 if (pool != null) pool.release();
215 }
216 }
217
add(int[] pointArray, int count)218 void add(int[] pointArray, int count) {
219 count = count / 2 * 2;
220 if (count <= 2) return;
221 NSAutoreleasePool pool = null;
222 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
223 try {
224 long polyRgn = polyRgn(pointArray, count);
225 OS.UnionRgn(handle, polyRgn, handle);
226 OS.DisposeRgn(polyRgn);
227 } finally {
228 if (pool != null) pool.release();
229 }
230 }
231
232 /**
233 * Adds the given rectangle to the collection of polygons
234 * the receiver maintains to describe its area.
235 *
236 * @param rect the rectangle to merge with the receiver
237 *
238 * @exception IllegalArgumentException <ul>
239 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
240 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
241 * </ul>
242 * @exception SWTException <ul>
243 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
244 * </ul>
245 */
add(Rectangle rect)246 public void add(Rectangle rect) {
247 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
248 if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
249 if (rect.width < 0 || rect.height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
250 NSAutoreleasePool pool = null;
251 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
252 try {
253 add (rect.x, rect.y, rect.width, rect.height);
254 } finally {
255 if (pool != null) pool.release();
256 }
257 }
258
259 /**
260 * Adds the given rectangle to the collection of polygons
261 * the receiver maintains to describe its area.
262 *
263 * @param x the x coordinate of the rectangle
264 * @param y the y coordinate of the rectangle
265 * @param width the width coordinate of the rectangle
266 * @param height the height coordinate of the rectangle
267 *
268 * @exception IllegalArgumentException <ul>
269 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
270 * </ul>
271 * @exception SWTException <ul>
272 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
273 * </ul>
274 *
275 * @since 3.1
276 */
add(int x, int y, int width, int height)277 public void add(int x, int y, int width, int height) {
278 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
279 if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
280 NSAutoreleasePool pool = null;
281 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
282 try {
283 long rectRgn = OS.NewRgn();
284 short[] r = new short[4];
285 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
286 OS.RectRgn(rectRgn, r);
287 OS.UnionRgn(handle, rectRgn, handle);
288 OS.DisposeRgn(rectRgn);
289 } finally {
290 if (pool != null) pool.release();
291 }
292 }
293
294 /**
295 * Adds all of the polygons which make up the area covered
296 * by the argument to the collection of polygons the receiver
297 * maintains to describe its area.
298 *
299 * @param region the region to merge
300 *
301 * @exception IllegalArgumentException <ul>
302 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
303 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
304 * </ul>
305 * @exception SWTException <ul>
306 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
307 * </ul>
308 */
add(Region region)309 public void add(Region region) {
310 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
311 if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
312 if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
313 NSAutoreleasePool pool = null;
314 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
315 try {
316 OS.UnionRgn(handle, region.handle, handle);
317 } finally {
318 if (pool != null) pool.release();
319 }
320 }
321
322 /**
323 * Returns <code>true</code> if the point specified by the
324 * arguments is inside the area specified by the receiver,
325 * and <code>false</code> otherwise.
326 *
327 * @param x the x coordinate of the point to test for containment
328 * @param y the y coordinate of the point to test for containment
329 * @return <code>true</code> if the region contains the point and <code>false</code> otherwise
330 *
331 * @exception SWTException <ul>
332 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
333 * </ul>
334 */
contains(int x, int y)335 public boolean contains(int x, int y) {
336 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
337 NSAutoreleasePool pool = null;
338 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
339 try {
340 short[] point = new short[]{(short)y, (short)x};
341 return OS.PtInRgn(point, handle);
342 } finally {
343 if (pool != null) pool.release();
344 }
345 }
346
347 /**
348 * Returns <code>true</code> if the given point is inside the
349 * area specified by the receiver, and <code>false</code>
350 * otherwise.
351 *
352 * @param pt the point to test for containment
353 * @return <code>true</code> if the region contains the point and <code>false</code> otherwise
354 *
355 * @exception IllegalArgumentException <ul>
356 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
357 * </ul>
358 * @exception SWTException <ul>
359 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
360 * </ul>
361 */
contains(Point pt)362 public boolean contains(Point pt) {
363 if (pt == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
364 return contains(pt.x, pt.y);
365 }
366
367 NSAffineTransform transform;
convertRgn(NSAffineTransform transform)368 void convertRgn(NSAffineTransform transform) {
369 long newRgn = OS.NewRgn();
370 Callback callback = new Callback(this, "convertRgn", 4);
371 this.transform = transform;
372 OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, callback.getAddress(), newRgn);
373 this.transform = null;
374 callback.dispose();
375 OS.CopyRgn(newRgn, handle);
376 OS.DisposeRgn(newRgn);
377 }
378
convertRgn(long message, long rgn, long r, long newRgn)379 long convertRgn(long message, long rgn, long r, long newRgn) {
380 if (message == OS.kQDRegionToRectsMsgParse) {
381 short[] rect = new short[4];
382 C.memmove(rect, r, rect.length * 2);
383 int i = 0;
384 NSPoint point = new NSPoint();
385 int[] points = new int[10];
386 point.x = rect[1];
387 point.y = rect[0];
388 point = transform.transformPoint(point);
389 short startX, startY;
390 points[i++] = startX = (short)point.x;
391 points[i++] = startY = (short)point.y;
392 point.x = rect[3];
393 point.y = rect[0];
394 point = transform.transformPoint(point);
395 points[i++] = (short)Math.round(point.x);
396 points[i++] = (short)point.y;
397 point.x = rect[3];
398 point.y = rect[2];
399 point = transform.transformPoint(point);
400 points[i++] = (short)Math.round(point.x);
401 points[i++] = (short)Math.round(point.y);
402 point.x = rect[1];
403 point.y = rect[2];
404 point = transform.transformPoint(point);
405 points[i++] = (short)point.x;
406 points[i++] = (short)Math.round(point.y);
407 points[i++] = startX;
408 points[i++] = startY;
409 long polyRgn = polyRgn(points, points.length);
410 OS.UnionRgn(newRgn, polyRgn, newRgn);
411 OS.DisposeRgn(polyRgn);
412 }
413 return 0;
414 }
415
416 @Override
destroy()417 void destroy() {
418 OS.DisposeRgn(handle);
419 handle = 0;
420 }
421
422 /**
423 * Compares the argument to the receiver, and returns true
424 * if they represent the <em>same</em> object using a class
425 * specific comparison.
426 *
427 * @param object the object to compare with this object
428 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
429 *
430 * @see #hashCode
431 */
432 @Override
equals(Object object)433 public boolean equals(Object object) {
434 if (this == object) return true;
435 if (!(object instanceof Region)) return false;
436 Region region = (Region)object;
437 return handle == region.handle;
438 }
439
440 /**
441 * Returns a rectangle which represents the rectangular
442 * union of the collection of polygons the receiver
443 * maintains to describe its area.
444 *
445 * @return a bounding rectangle for the region
446 *
447 * @exception SWTException <ul>
448 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
449 * </ul>
450 *
451 * @see Rectangle#union
452 */
getBounds()453 public Rectangle getBounds() {
454 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
455 NSAutoreleasePool pool = null;
456 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
457 try {
458 short[] bounds = new short[4];
459 OS.GetRegionBounds(handle, bounds);
460 int width = bounds[3] - bounds[1];
461 int height = bounds[2] - bounds[0];
462 return new Rectangle(bounds[1], bounds[0], width, height);
463 } finally {
464 if (pool != null) pool.release();
465 }
466 }
467
getPath()468 NSBezierPath getPath() {
469 Callback callback = new Callback(this, "regionToRects", 4);
470 NSBezierPath path = NSBezierPath.bezierPath();
471 path.retain();
472 OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, callback.getAddress(), path.id);
473 callback.dispose();
474 if (path.isEmpty()) path.appendBezierPathWithRect(new NSRect());
475 return path;
476 }
477
478 NSPoint pt = new NSPoint();
479 short[] rect = new short[4];
regionToRects(long message, long rgn, long r, long path)480 long regionToRects(long message, long rgn, long r, long path) {
481 if (message == OS.kQDRegionToRectsMsgParse) {
482 C.memmove(rect, r, rect.length * 2);
483 pt.x = rect[1];
484 pt.y = rect[0];
485 OS.objc_msgSend(path, OS.sel_moveToPoint_, pt);
486 pt.x = rect[3];
487 OS.objc_msgSend(path, OS.sel_lineToPoint_, pt);
488 pt.x = rect[3];
489 pt.y = rect[2];
490 OS.objc_msgSend(path, OS.sel_lineToPoint_, pt);
491 pt.x = rect[1];
492 OS.objc_msgSend(path, OS.sel_lineToPoint_, pt);
493 OS.objc_msgSend(path, OS.sel_closePath);
494 }
495 return 0;
496 }
497
498 /**
499 * Returns an integer hash code for the receiver. Any two
500 * objects that return <code>true</code> when passed to
501 * <code>equals</code> must return the same value for this
502 * method.
503 *
504 * @return the receiver's hash
505 *
506 * @see #equals
507 */
508 @Override
hashCode()509 public int hashCode() {
510 return (int)handle;
511 }
512
513 /**
514 * Intersects the given rectangle to the collection of polygons
515 * the receiver maintains to describe its area.
516 *
517 * @param rect the rectangle to intersect with the receiver
518 *
519 * @exception IllegalArgumentException <ul>
520 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
521 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
522 * </ul>
523 * @exception SWTException <ul>
524 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
525 * </ul>
526 *
527 * @since 3.0
528 */
intersect(Rectangle rect)529 public void intersect(Rectangle rect) {
530 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
531 if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
532 intersect (rect.x, rect.y, rect.width, rect.height);
533 }
534
535 /**
536 * Intersects the given rectangle to the collection of polygons
537 * the receiver maintains to describe its area.
538 *
539 * @param x the x coordinate of the rectangle
540 * @param y the y coordinate of the rectangle
541 * @param width the width coordinate of the rectangle
542 * @param height the height coordinate of the rectangle
543 *
544 * @exception IllegalArgumentException <ul>
545 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
546 * </ul>
547 * @exception SWTException <ul>
548 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
549 * </ul>
550 *
551 * @since 3.1
552 */
intersect(int x, int y, int width, int height)553 public void intersect(int x, int y, int width, int height) {
554 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
555 if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
556 NSAutoreleasePool pool = null;
557 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
558 try {
559 long rectRgn = OS.NewRgn();
560 short[] r = new short[4];
561 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
562 OS.RectRgn(rectRgn, r);
563 OS.SectRgn(handle, rectRgn, handle);
564 OS.DisposeRgn(rectRgn);
565 } finally {
566 if (pool != null) pool.release();
567 }
568 }
569
570 /**
571 * Intersects all of the polygons which make up the area covered
572 * by the argument to the collection of polygons the receiver
573 * maintains to describe its area.
574 *
575 * @param region the region to intersect
576 *
577 * @exception IllegalArgumentException <ul>
578 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
579 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
580 * </ul>
581 * @exception SWTException <ul>
582 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
583 * </ul>
584 *
585 * @since 3.0
586 */
intersect(Region region)587 public void intersect(Region region) {
588 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
589 if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
590 if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
591 NSAutoreleasePool pool = null;
592 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
593 try {
594 OS.SectRgn(handle, region.handle, handle);
595 } finally {
596 if (pool != null) pool.release();
597 }
598 }
599
600 /**
601 * Returns <code>true</code> if the rectangle described by the
602 * arguments intersects with any of the polygons the receiver
603 * maintains to describe its area, and <code>false</code> otherwise.
604 *
605 * @param x the x coordinate of the origin of the rectangle
606 * @param y the y coordinate of the origin of the rectangle
607 * @param width the width of the rectangle
608 * @param height the height of the rectangle
609 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise
610 *
611 * @exception SWTException <ul>
612 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
613 * </ul>
614 *
615 * @see Rectangle#intersects(Rectangle)
616 */
intersects(int x, int y, int width, int height)617 public boolean intersects (int x, int y, int width, int height) {
618 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
619 NSAutoreleasePool pool = null;
620 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
621 try {
622 short[] r = new short[4];
623 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
624 return OS.RectInRgn(r, handle);
625 } finally {
626 if (pool != null) pool.release();
627 }
628 }
629
630 /**
631 * Returns <code>true</code> if the given rectangle intersects
632 * with any of the polygons the receiver maintains to describe
633 * its area and <code>false</code> otherwise.
634 *
635 * @param rect the rectangle to test for intersection
636 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise
637 *
638 * @exception IllegalArgumentException <ul>
639 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
640 * </ul>
641 * @exception SWTException <ul>
642 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
643 * </ul>
644 *
645 * @see Rectangle#intersects(Rectangle)
646 */
intersects(Rectangle rect)647 public boolean intersects(Rectangle rect) {
648 if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
649 return intersects(rect.x, rect.y, rect.width, rect.height);
650 }
651
652 /**
653 * Returns <code>true</code> if the region has been disposed,
654 * and <code>false</code> otherwise.
655 * <p>
656 * This method gets the dispose state for the region.
657 * When a region has been disposed, it is an error to
658 * invoke any other method (except {@link #dispose()}) using the region.
659 *
660 * @return <code>true</code> when the region is disposed, and <code>false</code> otherwise
661 */
662 @Override
isDisposed()663 public boolean isDisposed() {
664 return handle == 0;
665 }
666
667 /**
668 * Returns <code>true</code> if the receiver does not cover any
669 * area in the (x, y) coordinate plane, and <code>false</code> if
670 * the receiver does cover some area in the plane.
671 *
672 * @return <code>true</code> if the receiver is empty, and <code>false</code> otherwise
673 *
674 * @exception SWTException <ul>
675 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
676 * </ul>
677 */
isEmpty()678 public boolean isEmpty() {
679 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
680 NSAutoreleasePool pool = null;
681 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
682 try {
683 return OS.EmptyRgn(handle);
684 } finally {
685 if (pool != null) pool.release();
686 }
687 }
688
689 /**
690 * Subtracts the given polygon from the collection of polygons
691 * the receiver maintains to describe its area.
692 *
693 * @param pointArray points that describe the polygon to merge with the receiver
694 *
695 * @exception IllegalArgumentException <ul>
696 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
697 * </ul>
698 * @exception SWTException <ul>
699 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
700 * </ul>
701 *
702 * @since 3.0
703 */
subtract(int[] pointArray)704 public void subtract (int[] pointArray) {
705 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
706 if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
707 if (pointArray.length < 2) return;
708 NSAutoreleasePool pool = null;
709 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
710 try {
711 long polyRgn = polyRgn(pointArray, pointArray.length);
712 OS.DiffRgn(handle, polyRgn, handle);
713 OS.DisposeRgn(polyRgn);
714 } finally {
715 if (pool != null) pool.release();
716 }
717 }
718
719 /**
720 * Subtracts the given rectangle from the collection of polygons
721 * the receiver maintains to describe its area.
722 *
723 * @param rect the rectangle to subtract from the receiver
724 *
725 * @exception IllegalArgumentException <ul>
726 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
727 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
728 * </ul>
729 * @exception SWTException <ul>
730 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
731 * </ul>
732 *
733 * @since 3.0
734 */
subtract(Rectangle rect)735 public void subtract(Rectangle rect) {
736 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
737 if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
738 subtract (rect.x, rect.y, rect.width, rect.height);
739 }
740
741 /**
742 * Subtracts the given rectangle from the collection of polygons
743 * the receiver maintains to describe its area.
744 *
745 * @param x the x coordinate of the rectangle
746 * @param y the y coordinate of the rectangle
747 * @param width the width coordinate of the rectangle
748 * @param height the height coordinate of the rectangle
749 *
750 * @exception IllegalArgumentException <ul>
751 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li>
752 * </ul>
753 * @exception SWTException <ul>
754 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
755 * </ul>
756 *
757 * @since 3.1
758 */
subtract(int x, int y, int width, int height)759 public void subtract(int x, int y, int width, int height) {
760 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
761 if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
762 NSAutoreleasePool pool = null;
763 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
764 try {
765 long rectRgn = OS.NewRgn();
766 short[] r = new short[4];
767 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
768 OS.RectRgn(rectRgn, r);
769 OS.DiffRgn(handle, rectRgn, handle);
770 OS.DisposeRgn(rectRgn);
771 } finally {
772 if (pool != null) pool.release();
773 }
774 }
775
776 /**
777 * Subtracts all of the polygons which make up the area covered
778 * by the argument from the collection of polygons the receiver
779 * maintains to describe its area.
780 *
781 * @param region the region to subtract
782 *
783 * @exception IllegalArgumentException <ul>
784 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
785 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
786 * </ul>
787 * @exception SWTException <ul>
788 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
789 * </ul>
790 *
791 * @since 3.0
792 */
subtract(Region region)793 public void subtract(Region region) {
794 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
795 if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
796 if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
797 NSAutoreleasePool pool = null;
798 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
799 try {
800 OS.DiffRgn(handle, region.handle, handle);
801 } finally {
802 if (pool != null) pool.release();
803 }
804 }
805
806 /**
807 * Translate all of the polygons the receiver maintains to describe
808 * its area by the specified point.
809 *
810 * @param x the x coordinate of the point to translate
811 * @param y the y coordinate of the point to translate
812 *
813 * @exception SWTException <ul>
814 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
815 * </ul>
816 *
817 * @since 3.1
818 */
translate(int x, int y)819 public void translate (int x, int y) {
820 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
821 NSAutoreleasePool pool = null;
822 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
823 try {
824 OS.OffsetRgn (handle, (short)x, (short)y);
825 } finally {
826 if (pool != null) pool.release();
827 }
828 }
829
830 /**
831 * Translate all of the polygons the receiver maintains to describe
832 * its area by the specified point.
833 *
834 * @param pt the point to translate
835 *
836 * @exception IllegalArgumentException <ul>
837 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
838 * </ul>
839 * @exception SWTException <ul>
840 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
841 * </ul>
842 *
843 * @since 3.1
844 */
translate(Point pt)845 public void translate (Point pt) {
846 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
847 if (pt == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
848 NSAutoreleasePool pool = null;
849 if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
850 try {
851 translate (pt.x, pt.y);
852 } finally {
853 if (pool != null) pool.release();
854 }
855 }
856
857 /**
858 * Returns a string containing a concise, human-readable
859 * description of the receiver.
860 *
861 * @return a string representation of the receiver
862 */
863 @Override
toString()864 public String toString () {
865 if (isDisposed()) return "Region {*DISPOSED*}";
866 return "Region {" + handle + "}";
867 }
868 }
869