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/*******************************************************************************
* Copyright (c) 2000, 2008 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.wpf.*;
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>
*
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
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>
*
* @noreference This field is not intended to be referenced by clients.
*/
public int handle;
/**
* 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) {
super(device);
handle = OS.gcnew_GeometryGroup();
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
init();
}
/**
* Constructs a new region given a handle to the operating
* system resources that it should represent.
*
* @param handle the handle for the result
*/
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 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);
combine(pointArray, OS.GeometryCombineMode_Union);
}
/**
* 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);
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry1 = OS.gcnew_RectangleGeometry(rect);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) == 0) {
OS.GeometryCollection_Add(geometries, geometry1);
} else {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Union, geometry1, geometry2);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(rect);
OS.GCHandle_Free(geometry1);
OS.GCHandle_Free(geometries);
}
/**
* 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);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) == 0) {
OS.GeometryCollection_Add(geometries, region.handle);
} else {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Union, region.handle, geometry2);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(geometries);
}
void combine (int[] pointArray, int mode) {
if (pointArray.length < 4) return;
int list = OS.gcnew_PointCollection(pointArray.length / 2);
for (int i = 2; i < pointArray.length; i += 2) {
int point = OS.gcnew_Point(pointArray[i], pointArray[i + 1]);
OS.PointCollection_Add(list, point);
OS.GCHandle_Free(point);
}
int poly = OS.gcnew_PolyLineSegment(list, true);
OS.GCHandle_Free(list);
int figure = OS.gcnew_PathFigure();
int startPoint = OS.gcnew_Point(pointArray[0], pointArray[1]);
OS.PathFigure_StartPoint(figure, startPoint);
OS.PathFigure_IsClosed(figure, true);
int segments = OS.PathFigure_Segments(figure);
OS.PathSegmentCollection_Add(segments, poly);
int path = OS.gcnew_PathGeometry();
int figures = OS.PathGeometry_Figures(path);
OS.PathFigureCollection_Add(figures, figure);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) == 0) {
if (mode == OS.GeometryCombineMode_Union) OS.GeometryCollection_Add(geometries, path);
} else {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(mode, geometry2, path);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(geometries);
OS.GCHandle_Free(figures);
OS.GCHandle_Free(path);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(figure);
OS.GCHandle_Free(startPoint);
OS.GCHandle_Free(poly);
}
/**
* 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);
int point = OS.gcnew_Point(x, y);
boolean result = OS.Geometry_FillContains(handle, point);
OS.GCHandle_Free(point);
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 (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pt == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
return contains(pt.x, pt.y);
}
void destroy() {
OS.GCHandle_Free(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 boolean equals (Object object) {
if (this == object) return true;
if (!(object instanceof Region)) return false;
Region rgn = (Region)object;
return handle == rgn.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 (OS.Geometry_IsEmpty(handle)) return new Rectangle(0, 0, 0, 0);
int rect = OS.Geometry_Bounds(handle);
Rectangle result = new Rectangle((int)OS.Rect_X(rect), (int)OS.Rect_Y(rect), (int)OS.Rect_Width(rect), (int)OS.Rect_Height(rect));
OS.GCHandle_Free(rect);
return result;
}
/**
* 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);
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry1 = OS.gcnew_RectangleGeometry(rect);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) != 0) {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Intersect, geometry1, geometry2);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(rect);
OS.GCHandle_Free(geometry1);
OS.GCHandle_Free(geometries);
}
/**
* 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);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) != 0) {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Intersect, region.handle, geometry2);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(geometries);
}
/**
* 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);
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry = OS.gcnew_RectangleGeometry(rect);
int result = OS.Geometry_FillContainsWithDetail(handle, geometry);
OS.GCHandle_Free(geometry);
OS.GCHandle_Free(rect);
return result != OS.IntersectionDetail_Empty;
}
/**
* 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 (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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 (except {@link #dispose()}) 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 () {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return OS.Geometry_IsEmpty(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);
combine(pointArray, OS.GeometryCombineMode_Exclude);
}
/**
* 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);
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry1 = OS.gcnew_RectangleGeometry(rect);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) != 0) {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Exclude, geometry2, geometry1);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(rect);
OS.GCHandle_Free(geometry1);
OS.GCHandle_Free(geometries);
}
/**
* 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);
int geometries = OS.GeometryGroup_Children(handle);
if (OS.GeometryCollection_Count(geometries) != 0) {
int geometry2 = OS.GeometryGroup_Children(handle, 0);
int geometry3 = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Exclude, geometry2, region.handle);
OS.GeometryCollection_Remove(geometries, geometry2);
OS.GeometryCollection_Add(geometries, geometry3);
OS.GCHandle_Free(geometry2);
OS.GCHandle_Free(geometry3);
}
OS.GCHandle_Free(geometries);
}
/**
* 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);
int transform1 = OS.Geometry_Transform(handle);
int transform2 = OS.gcnew_TranslateTransform(x, y);
int transform = OS.gcnew_TransformGroup();
int transforms = OS.TransformGroup_Children(transform);
OS.TransformCollection_Add(transforms, transform1);
OS.TransformCollection_Add(transforms, transform2);
OS.Geometry_Transform(handle, transform);
OS.GCHandle_Free(transform1);
OS.GCHandle_Free(transform2);
OS.GCHandle_Free(transform);
OS.GCHandle_Free(transforms);
}
/**
* 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 + "}";
}
/**
* Invokes platform specific functionality to allocate a new region.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>Region</code>. 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 called from
* application code.
* </p>
*
* @param device the device on which to allocate the region
* @param handle the handle for the region
* @return a new region object containing the specified device and handle
*
* @noreference This method is not intended to be referenced by clients.
*/
public static Region wpf_new(Device device, int handle) {
return new Region(device, handle);
}
}
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