| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.graphics; |
| |
| |
| import org.eclipse.swt.internal.gtk.*; |
| 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 rectangles. |
| * <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 { |
| /** |
| * the OS resource for the region |
| * (Warning: This field is platform dependent) |
| */ |
| public int /*long*/ handle; |
| |
| /** |
| * The device where this region was created. |
| */ |
| Device device; |
| |
| /** |
| * 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 SWTError <ul> |
| * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li> |
| * </ul> |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</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 = OS.gdk_region_new(); |
| if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| if (device.tracking) device.new_Object(this); |
| } |
| |
| Region(Device device, int /*long*/ handle) { |
| this.device = device; |
| this.handle = handle; |
| } |
| |
| /** |
| * Adds the given polygon to the collection of rectangles |
| * 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); |
| int /*long*/ polyRgn = OS.gdk_region_polygon(pointArray, pointArray.length / 2, OS.GDK_EVEN_ODD_RULE); |
| OS.gdk_region_union(handle, polyRgn); |
| OS.gdk_region_destroy(polyRgn); |
| } |
| |
| /** |
| * Adds the given rectangle to the collection of rectangles |
| * 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); |
| if (rect.width < 0 || rect.height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| GdkRectangle gdkRect = new GdkRectangle(); |
| gdkRect.x = rect.x; |
| gdkRect.y = rect.y; |
| gdkRect.width = rect.width; |
| gdkRect.height = rect.height; |
| OS.gdk_region_union_with_rect(handle, gdkRect); |
| } |
| |
| /** |
| * Adds all of the rectangles which make up the area covered |
| * by the argument to the collection of rectangles 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); |
| OS.gdk_region_union(handle, region.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 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); |
| return OS.gdk_region_point_in(handle, x, y); |
| } |
| |
| /** |
| * 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; |
| OS.gdk_region_destroy(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 rectangles 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); |
| GdkRectangle gdkRect = new GdkRectangle(); |
| OS.gdk_region_get_clipbox(handle, gdkRect); |
| return new Rectangle(gdkRect.x, gdkRect.y, gdkRect.width, gdkRect.height); |
| } |
| |
| public static Region gtk_new(Device device, int /*long*/ handle) { |
| return new Region(device, handle); |
| } |
| |
| /** |
| * Returns an integer hash code for the receiver. Any two |
| * objects which 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 (int)/*64*/handle; |
| } |
| |
| /** |
| * Intersects the given rectangle to the collection of rectangles |
| * 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); |
| if (rect.width < 0 || rect.height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| GdkRectangle gdkRect = new GdkRectangle(); |
| gdkRect.x = rect.x; |
| gdkRect.y = rect.y; |
| gdkRect.width = rect.width; |
| gdkRect.height = rect.height; |
| int /*long*/ rectRgn = OS.gdk_region_rectangle(gdkRect); |
| OS.gdk_region_intersect(handle, rectRgn); |
| OS.gdk_region_destroy(rectRgn); |
| } |
| |
| /** |
| * Intersects all of the rectangles which make up the area covered |
| * by the argument to the collection of rectangles 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); |
| OS.gdk_region_intersect(handle, region.handle); |
| } |
| |
| /** |
| * Returns <code>true</code> if the rectangle described by the |
| * arguments intersects with any of the rectangles the receiver |
| * mainains 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 |
| */ |
| public boolean intersects (int x, int y, int width, int height) { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| GdkRectangle gdkRect = new GdkRectangle(); |
| gdkRect.x = x; |
| gdkRect.y = y; |
| gdkRect.width = width; |
| gdkRect.height = height; |
| return OS.gdk_region_rect_in(handle, gdkRect) != OS.GDK_OVERLAP_RECTANGLE_OUT; |
| } |
| /** |
| * Returns <code>true</code> if the given rectangle intersects |
| * with any of the rectangles the receiver mainains 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 |
| */ |
| 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() { |
| if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); |
| return OS.gdk_region_empty(handle); |
| } |
| |
| /** |
| * Subtracts the given polygon from the collection of rectangles |
| * 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); |
| int /*long*/ polyRgn = OS.gdk_region_polygon(pointArray, pointArray.length / 2, OS.GDK_EVEN_ODD_RULE); |
| OS.gdk_region_subtract(handle, polyRgn); |
| OS.gdk_region_destroy(polyRgn); |
| } |
| |
| /** |
| * Subtracts the given rectangle from the collection of rectangles |
| * 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); |
| if (rect.width < 0 || rect.height < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| GdkRectangle gdkRect = new GdkRectangle(); |
| gdkRect.x = rect.x; |
| gdkRect.y = rect.y; |
| gdkRect.width = rect.width; |
| gdkRect.height = rect.height; |
| int /*long*/ rectRgn = OS.gdk_region_rectangle(gdkRect); |
| OS.gdk_region_subtract(handle, rectRgn); |
| OS.gdk_region_destroy(rectRgn); |
| } |
| |
| /** |
| * Subtracts all of the rectangles which make up the area covered |
| * by the argument from the collection of rectangles 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); |
| OS.gdk_region_subtract(handle, region.handle); |
| } |
| |
| /** |
| * 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 + "}"; |
| } |
| } |