| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.graphics; |
| |
| |
| import org.eclipse.swt.internal.photon.*; |
| import org.eclipse.swt.*; |
| |
| /** |
| * Instances of this class represent areas of an x-y coordinate |
| * system that are aggregates of the areas covered by a number |
| * of polygons. |
| * <p> |
| * Application code must explicitly invoke the <code>Region.dispose()</code> |
| * method to release the operating system resources managed by each instance |
| * when those instances are no longer required. |
| * </p> |
| */ |
| public final class Region extends Resource { |
| |
| /** |
| * the OS resource for the region |
| * (Warning: This field is platform dependent) |
| * <p> |
| * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT |
| * public API. It is marked public only so that it can be shared |
| * within the packages provided by SWT. It is not available on all |
| * platforms and should never be accessed from application code. |
| * </p> |
| */ |
| public int handle; |
| |
| static int EMPTY_REGION = -1; |
| |
| /** |
| * Constructs a new empty region. |
| * |
| * @exception SWTError <ul> |
| * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li> |
| * </ul> |
| */ |
| public Region () { |
| this(null); |
| } |
| /** |
| * Constructs a new empty region. |
| * <p> |
| * You must dispose the region when it is no longer required. |
| * </p> |
| * |
| * @param device the device on which to allocate the region |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> |
| * </ul> |
| * @exception SWTError <ul> |
| * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li> |
| * </ul> |
| * |
| * @see #dispose |
| * |
| * @since 3.0 |
| */ |
| public Region (Device device) { |
| if (device == null) device = Device.getDevice(); |
| if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| this.device = device; |
| handle = EMPTY_REGION; |
| if (device.tracking) device.new_Object(this); |
| } |
| |
| Region(Device device, int handle) { |
| this.device = device; |
| this.handle = handle; |
| } |
| |
| /** |
| * Adds the given polygon to the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param pointArray points that describe the polygon to merge with the receiver |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| * |
| */ |
| public void add (int[] pointArray) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| // TODO |
| } |
| |
| /** |
| * Adds the given rectangle to the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param rect the rectangle to merge with the receiver |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void add (Rectangle rect) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| add (rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Adds the given rectangle to the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param x the x coordinate of the rectangle |
| * @param y the y coordinate of the rectangle |
| * @param width the width coordinate of the rectangle |
| * @param height the height coordinate of the rectangle |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.1 |
| */ |
| public void add (int x, int y, int width, int height) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0) return; |
| int tile_ptr = OS.PhGetTile(); |
| PhTile_t tile = new PhTile_t(); |
| tile.rect_ul_x = (short)x; |
| tile.rect_ul_y = (short)y; |
| tile.rect_lr_x = (short)(x + width - 1); |
| tile.rect_lr_y = (short)(y + height - 1); |
| OS.memmove(tile_ptr, tile, PhTile_t.sizeof); |
| if (handle == EMPTY_REGION) handle = tile_ptr; |
| else handle = OS.PhAddMergeTiles (handle, tile_ptr, null); |
| } |
| |
| /** |
| * Adds all of the polygons which make up the area covered |
| * by the argument to the collection of polygons the receiver |
| * maintains to describe its area. |
| * |
| * @param region the region to merge |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public void add (Region region) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0) return; |
| if (region.handle == EMPTY_REGION) return; |
| int copy = OS.PhCopyTiles(region.handle); |
| if (handle == EMPTY_REGION) handle = copy; |
| else handle = OS.PhAddMergeTiles (handle, copy, null); |
| } |
| |
| /** |
| * Returns <code>true</code> if the point specified by the |
| * arguments is inside the area specified by the receiver, |
| * and <code>false</code> otherwise. |
| * |
| * @param x the x coordinate of the point to test for containment |
| * @param y the y coordinate of the point to test for containment |
| * @return <code>true</code> if the region contains the point and <code>false</code> otherwise |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public boolean contains (int x, int y) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (handle == 0 || handle == EMPTY_REGION) return false; |
| int tile_ptr = OS.PhGetTile(); |
| PhTile_t tile = new PhTile_t(); |
| tile.rect_ul_x = tile.rect_lr_x = (short)x; |
| tile.rect_ul_y = tile.rect_lr_y = (short)y; |
| OS.memmove(tile_ptr, tile, PhTile_t.sizeof); |
| int intersection = OS.PhIntersectTilings (tile_ptr, handle, null); |
| boolean result = intersection != 0; |
| OS.PhFreeTiles(tile_ptr); |
| OS.PhFreeTiles(intersection); |
| return result; |
| } |
| |
| /** |
| * Returns <code>true</code> if the given point is inside the |
| * area specified by the receiver, and <code>false</code> |
| * otherwise. |
| * |
| * @param pt the point to test for containment |
| * @return <code>true</code> if the region contains the point and <code>false</code> otherwise |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public boolean contains (Point pt) { |
| if (pt == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| return contains(pt.x, pt.y); |
| } |
| |
| /** |
| * Disposes of the operating system resources associated with |
| * the region. Applications must dispose of all regions which |
| * they allocate. |
| */ |
| public void dispose () { |
| if (handle == 0) return; |
| if (device.isDisposed()) return; |
| if (handle != EMPTY_REGION) OS.PhFreeTiles (handle); |
| handle = 0; |
| if (device.tracking) device.dispose_Object(this); |
| device = null; |
| } |
| |
| /** |
| * Compares the argument to the receiver, and returns true |
| * if they represent the <em>same</em> object using a class |
| * specific comparison. |
| * |
| * @param object the object to compare with this object |
| * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise |
| * |
| * @see #hashCode |
| */ |
| public boolean equals (Object object) { |
| if (this == object) return true; |
| if (!(object instanceof Region)) return false; |
| Region region = (Region)object; |
| return handle == region.handle; |
| } |
| |
| /** |
| * Returns a rectangle which represents the rectangular |
| * union of the collection of polygons the receiver |
| * maintains to describe its area. |
| * |
| * @return a bounding rectangle for the region |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see Rectangle#union |
| */ |
| public Rectangle getBounds() { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (handle == 0 || handle == EMPTY_REGION) return new Rectangle(0, 0, 0, 0); |
| PhTile_t tile = new PhTile_t(); |
| int temp_tile; |
| int rect_ptr = OS.malloc(PhRect_t.sizeof); |
| OS.memmove(rect_ptr, handle, PhRect_t.sizeof); |
| OS.memmove(tile, handle, PhTile_t.sizeof); |
| while ((temp_tile = tile.next) != 0) { |
| OS.PhRectUnion (rect_ptr, temp_tile); |
| OS.memmove(tile, temp_tile, PhTile_t.sizeof); |
| } |
| PhRect_t rect = new PhRect_t(); |
| OS.memmove(rect, rect_ptr, PhRect_t.sizeof); |
| OS.free(rect_ptr); |
| int width = rect.lr_x - rect.ul_x + 1; |
| int height = rect.lr_y - rect.ul_y + 1; |
| return new Rectangle(rect.ul_x, rect.ul_y, width, height); |
| } |
| |
| /** |
| * Returns an integer hash code for the receiver. Any two |
| * objects that return <code>true</code> when passed to |
| * <code>equals</code> must return the same value for this |
| * method. |
| * |
| * @return the receiver's hash |
| * |
| * @see #equals |
| */ |
| public int hashCode () { |
| return handle; |
| } |
| |
| /** |
| * Intersects the given rectangle to the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param rect the rectangle to intersect with the receiver |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| */ |
| public void intersect (Rectangle rect) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| intersect (rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Intersects the given rectangle to the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param x the x coordinate of the rectangle |
| * @param y the y coordinate of the rectangle |
| * @param width the width coordinate of the rectangle |
| * @param height the height coordinate of the rectangle |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.1 |
| */ |
| public void intersect (int x, int y, int width, int height) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0 || handle == EMPTY_REGION) return; |
| int tile_ptr = OS.PhGetTile(); |
| PhTile_t tile = new PhTile_t(); |
| tile.rect_ul_x = (short)x; |
| tile.rect_ul_y = (short)y; |
| tile.rect_lr_x = (short)(x + width - 1); |
| tile.rect_lr_y = (short)(y + height - 1); |
| OS.memmove(tile_ptr, tile, PhTile_t.sizeof); |
| int intersection = OS.PhIntersectTilings(handle, tile_ptr, null); |
| OS.PhFreeTiles(tile_ptr); |
| OS.PhFreeTiles(handle); |
| handle = intersection; |
| if (handle == 0) handle = EMPTY_REGION; |
| } |
| |
| /** |
| * Intersects all of the polygons which make up the area covered |
| * by the argument to the collection of polygons the receiver |
| * maintains to describe its area. |
| * |
| * @param region the region to intersect |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| */ |
| public void intersect (Region region) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0 || handle == EMPTY_REGION) return; |
| int intersection = 0; |
| if (region.handle != EMPTY_REGION) intersection = OS.PhIntersectTilings(handle, region.handle, null); |
| OS.PhFreeTiles(handle); |
| handle = intersection; |
| if (handle == 0) handle = EMPTY_REGION; |
| } |
| |
| /** |
| * Returns <code>true</code> if the rectangle described by the |
| * arguments intersects with any of the polygons the receiver |
| * maintains to describe its area, and <code>false</code> otherwise. |
| * |
| * @param x the x coordinate of the origin of the rectangle |
| * @param y the y coordinate of the origin of the rectangle |
| * @param width the width of the rectangle |
| * @param height the height of the rectangle |
| * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see Rectangle#intersects(Rectangle) |
| */ |
| public boolean intersects (int x, int y, int width, int height) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (handle == 0 || handle == EMPTY_REGION) return false; |
| int tile_ptr = OS.PhGetTile(); |
| PhTile_t tile = new PhTile_t(); |
| tile.rect_ul_x = (short)x; |
| tile.rect_ul_y = (short)y; |
| tile.rect_lr_x = (short)(x + width - 1); |
| tile.rect_lr_y = (short)(y + height - 1); |
| OS.memmove(tile_ptr, tile, PhTile_t.sizeof); |
| int intersection = OS.PhIntersectTilings (tile_ptr, handle, null); |
| boolean result = intersection != 0; |
| OS.PhFreeTiles(tile_ptr); |
| OS.PhFreeTiles(intersection); |
| return result; |
| } |
| |
| /** |
| * Returns <code>true</code> if the given rectangle intersects |
| * with any of the polygons the receiver maintains to describe |
| * its area and <code>false</code> otherwise. |
| * |
| * @param rect the rectangle to test for intersection |
| * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @see Rectangle#intersects(Rectangle) |
| */ |
| public boolean intersects (Rectangle rect) { |
| if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| return intersects(rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Returns <code>true</code> if the region has been disposed, |
| * and <code>false</code> otherwise. |
| * <p> |
| * This method gets the dispose state for the region. |
| * When a region has been disposed, it is an error to |
| * invoke any other method using the region. |
| * |
| * @return <code>true</code> when the region is disposed, and <code>false</code> otherwise |
| */ |
| public boolean isDisposed() { |
| return handle == 0; |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver does not cover any |
| * area in the (x, y) coordinate plane, and <code>false</code> if |
| * the receiver does cover some area in the plane. |
| * |
| * @return <code>true</code> if the receiver is empty, and <code>false</code> otherwise |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| */ |
| public boolean isEmpty () { |
| return getBounds().isEmpty(); |
| |
| } |
| |
| public static Region photon_new(Device device, int handle) { |
| return new Region(device, handle); |
| } |
| |
| /** |
| * Subtracts the given polygon from the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param pointArray points that describe the polygon to merge with the receiver |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| */ |
| public void subtract (int[] pointArray) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| // TODO |
| } |
| |
| /** |
| * Subtracts the given rectangle from the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param rect the rectangle to subtract from the receiver |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| */ |
| public void subtract (Rectangle rect) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| subtract (rect.x, rect.y, rect.width, rect.height); |
| } |
| |
| /** |
| * Subtracts the given rectangle from the collection of polygons |
| * the receiver maintains to describe its area. |
| * |
| * @param x the x coordinate of the rectangle |
| * @param y the y coordinate of the rectangle |
| * @param width the width coordinate of the rectangle |
| * @param height the height coordinate of the rectangle |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.1 |
| */ |
| public void subtract (int x, int y, int width, int height) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (width < 0 || height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0 || handle == EMPTY_REGION) return; |
| int tile_ptr = OS.PhGetTile(); |
| PhTile_t tile = new PhTile_t(); |
| tile.rect_ul_x = (short)x; |
| tile.rect_ul_y = (short)y; |
| tile.rect_lr_x = (short)(x + width - 1); |
| tile.rect_lr_y = (short)(y + height - 1); |
| OS.memmove(tile_ptr, tile, PhTile_t.sizeof); |
| handle = OS.PhClipTilings(handle, tile_ptr, null); |
| OS.PhFreeTiles(tile_ptr); |
| if (handle == 0) handle = EMPTY_REGION; |
| } |
| |
| /** |
| * Subtracts all of the polygons which make up the area covered |
| * by the argument from the collection of polygons the receiver |
| * maintains to describe its area. |
| * |
| * @param region the region to subtract |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.0 |
| */ |
| public void subtract (Region region) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| if (handle == 0 || handle == EMPTY_REGION) return; |
| if (region.handle == EMPTY_REGION) return; |
| handle = OS.PhClipTilings(handle, region.handle, null); |
| if (handle == 0) handle = EMPTY_REGION; |
| } |
| |
| /** |
| * Translate all of the polygons the receiver maintains to describe |
| * its area by the specified point. |
| * |
| * @param x the x coordinate of the point to translate |
| * @param y the y coordinate of the point to translate |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.1 |
| */ |
| public void translate (int x, int y) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (handle == 0 || handle == EMPTY_REGION) return; |
| PhPoint_t pt = new PhPoint_t(); |
| pt.x = (short)x; |
| pt.y = (short)y; |
| OS.PhTranslateTiles (handle, pt); |
| } |
| |
| /** |
| * Translate all of the polygons the receiver maintains to describe |
| * its area by the specified point. |
| * |
| * @param pt the point to translate |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
| * </ul> |
| * |
| * @since 3.1 |
| */ |
| public void translate (Point pt) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| if (pt == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| translate (pt.x, pt.y); |
| } |
| |
| /** |
| * Returns a string containing a concise, human-readable |
| * description of the receiver. |
| * |
| * @return a string representation of the receiver |
| */ |
| public String toString () { |
| if (isDisposed()) return "Region {*DISPOSED*}"; |
| return "Region {" + handle + "}"; |
| } |
| } |