--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/graphics/Region.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,683 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 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
+ *******************************************************************************/
+module dwt.graphics.Region;
+
+import dwt.dwthelper.utils;
+
+
+import dwt.DWT;
+import dwt.DWTError;
+import dwt.DWTException;
+import dwt.internal.Callback;
+import dwt.internal.cocoa.NSAffineTransform;
+import dwt.internal.cocoa.NSBezierPath;
+import dwt.internal.cocoa.NSPoint;
+import dwt.internal.cocoa.NSRect;
+import dwt.internal.cocoa.OS;
+
+/**
+ * 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 DWT
+     * public API. It is marked public only so that it can be shared
+     * within the packages provided by DWT. It is not available on all
+     * platforms and should never be accessed from application code.
+     * </p>
+     */
+    public int handle;
+
+/**
+ * Constructs a new empty region.
+ * 
+ * @exception DWTError <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 DWTError <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) {
+    super(device);
+    handle = OS.NewRgn();
+    if (handle is 0) DWT.error(DWT.ERROR_NO_HANDLES);
+    init();
+}
+
+Region(Device device, int handle) {
+    super(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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ *
+ * @since 3.0
+*
+ */
+public void add (int[] pointArray) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    add(pointArray, pointArray.length);
+}
+    
+void add(int[] pointArray, int count) {
+    if (count <= 2) return;
+    int polyRgn = OS.NewRgn();
+    OS.OpenRgn();
+    OS.MoveTo((short)pointArray[0], (short)pointArray[1]);
+    for (int i = 1; i < count / 2; i++) {
+        OS.LineTo((short)pointArray[2 * i], (short)pointArray[2 * i + 1]);
+    }
+    OS.LineTo((short)pointArray[0], (short)pointArray[1]);
+    OS.CloseRgn(polyRgn);
+    OS.UnionRgn(handle, polyRgn, handle);
+    OS.DisposeRgn(polyRgn);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void add(Rectangle rect) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (rect.width < 0 || rect.height < 0) DWT.error(DWT.ERROR_INVALID_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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    int rectRgn = OS.NewRgn();
+    short[] r = new short[4];
+    OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
+    OS.RectRgn(rectRgn, r);
+    OS.UnionRgn(handle, rectRgn, handle);
+    OS.DisposeRgn(rectRgn);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void add(Region region) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    OS.UnionRgn(handle, region.handle, handle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public bool contains(int x, int y) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    short[] point = new short[]{(short)x, (short)y};
+    return OS.PtInRgn(point, handle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public bool contains(Point pt) {
+    if (pt is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    return contains(pt.x, pt.y);
+}
+
+NSAffineTransform transform;
+void convertRgn(NSAffineTransform transform) {
+    int newRgn = OS.NewRgn();
+    Callback callback = new Callback(this, "convertRgn", 4);
+    int proc = callback.getAddress();
+    if (proc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
+    this.transform = transform;
+    OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, proc, newRgn);
+    this.transform = null;
+    callback.dispose();
+    OS.CopyRgn(newRgn, handle);
+    OS.DisposeRgn(newRgn);
+}
+
+int convertRgn(int message, int rgn, int r, int newRgn) {
+    if (message is OS.kQDRegionToRectsMsgParse) {
+        short[] rect = new short[4];
+        OS.memmove(rect, r, rect.length * 2);
+        NSPoint point = new NSPoint(); 
+        int polyRgn = OS.NewRgn();
+        OS.OpenRgn();
+        point.x = rect[1];
+        point.y = rect[0];
+        point = transform.transformPoint(point);
+        short startX, startY;
+        OS.MoveTo(startX = (short)point.x, startY = (short)point.y);
+        point.x = rect[3];
+        point.y = rect[0];
+        point = transform.transformPoint(point);
+        OS.LineTo((short)Math.round(point.x), (short)point.y);
+        point.x = rect[3];
+        point.y = rect[2];
+        point = transform.transformPoint(point);
+        OS.LineTo((short)Math.round(point.x), (short)Math.round(point.y));
+        point.x = rect[1];
+        point.y = rect[2];
+        point = transform.transformPoint(point);
+        OS.LineTo((short)point.x, (short)Math.round(point.y));
+        OS.LineTo(startX, startY);
+        OS.CloseRgn(polyRgn);
+        OS.UnionRgn(newRgn, polyRgn, newRgn);
+        OS.DisposeRgn(polyRgn);
+    }
+    return 0;
+}
+
+void destroy() {
+    OS.DisposeRgn(handle);
+    handle = 0;
+}
+
+/**
+ * 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 bool equals(Object object) {
+    if (this is object) return true;
+    if (!(object instanceof Region)) return false;
+    Region region = (Region)object;
+    return handle is 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ *
+ * @see Rectangle#union
+ */
+public Rectangle getBounds() {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    short[] bounds = new short[4];
+    OS.GetRegionBounds(handle, bounds);
+    int width = bounds[3] - bounds[1];
+    int height = bounds[2] - bounds[0];
+    return new Rectangle(bounds[1], bounds[0], width, height);
+}
+
+NSBezierPath getPath() {
+    Callback callback = new Callback(this, "regionToRects", 4);
+    if (callback.getAddress() is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS);
+    NSBezierPath path = NSBezierPath.bezierPath();
+    path.retain();
+    OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, callback.getAddress(), path.id);
+    callback.dispose();
+    if (path.isEmpty()) path.appendBezierPathWithRect(new NSRect());
+    return path;
+}
+
+NSPoint pt = new NSPoint();
+short[] rect = new short[4];
+int regionToRects(int message, int rgn, int r, int path) {
+    if (message is OS.kQDRegionToRectsMsgParse) {
+        OS.memmove(rect, r, rect.length * 2);
+        pt.x = rect[1];
+        pt.y = rect[0];
+        OS.objc_msgSend(path, OS.sel_moveToPoint_1, pt);
+        pt.x = rect[3];
+        OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt);
+        pt.x = rect[3];
+        pt.y = rect[2];
+        OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt);
+        pt.x = rect[1];
+        OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt);
+        OS.objc_msgSend(path, OS.sel_closePath);
+    }
+    return 0;
+}
+
+public static Region carbon_new(Device device, int handle) {
+    return new Region(device, handle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void intersect(Rectangle rect) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (rect is null) DWT.error(DWT.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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    int rectRgn = OS.NewRgn();
+    short[] r = new short[4];
+    OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
+    OS.RectRgn(rectRgn, r);
+    OS.SectRgn(handle, rectRgn, handle);
+    OS.DisposeRgn(rectRgn);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void intersect(Region region) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    OS.SectRgn(handle, region.handle, handle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ *
+ * @see Rectangle#intersects(Rectangle)
+ */
+public bool intersects (int x, int y, int width, int height) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    short[] r = new short[4];
+    OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
+    return OS.RectInRgn(rect, handle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ *
+ * @see Rectangle#intersects(Rectangle)
+ */
+public bool intersects(Rectangle rect) {
+    if (rect is null) DWT.error(DWT.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 bool isDisposed() {
+    return handle is 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public bool isEmpty() {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    return OS.EmptyRgn(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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void subtract (int[] pointArray) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (pointArray.length < 2) return;
+    int polyRgn = OS.NewRgn();
+    OS.OpenRgn();
+    OS.MoveTo((short)pointArray[0], (short)pointArray[1]);
+    for (int i = 1; i < pointArray.length / 2; i++) {
+        OS.LineTo((short)pointArray[2 * i], (short)pointArray[2 * i + 1]);
+    }
+    OS.LineTo((short)pointArray[0], (short)pointArray[1]);
+    OS.CloseRgn(polyRgn);
+    OS.DiffRgn(handle, polyRgn, handle);
+    OS.DisposeRgn(polyRgn);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void subtract(Rectangle rect) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (rect is null) DWT.error(DWT.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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    int rectRgn = OS.NewRgn();
+    short[] r = new short[4];
+    OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height));
+    OS.RectRgn(rectRgn, r);
+    OS.DiffRgn(handle, rectRgn, handle);
+    OS.DisposeRgn(rectRgn);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.0
+ */
+public void subtract(Region region) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    OS.DiffRgn(handle, region.handle, handle);
+}
+
+/**
+ * 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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    OS.OffsetRgn (handle, (short)x, (short)y);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public void translate (Point pt) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (pt is null) DWT.error(DWT.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 + "}";
+}
+}