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Tom Tromey
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libjava/classpath/java/awt/Dimension.java
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libjava/classpath/java/awt/Dimension.java
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/* Dimension.java -- represents a 2-dimensional span
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Copyright (C) 1999, 2000, 2002 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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import java.awt.geom.Dimension2D;
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import java.io.Serializable;
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/**
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* This class holds a width and height value pair. This is used in plenty
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* of windowing classes, but also has geometric meaning.
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*
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* <p>It is valid for a dimension to have negative width or height; but it
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* is considered to have no area. Therefore, the behavior in various methods
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* is undefined in such a case.
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*
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* <p>There are some public fields; if you mess with them in an inconsistent
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* manner, it is your own fault when you get invalid results. Also, this
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* class is not threadsafe.
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*
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* @author Per Bothner (bothner@cygnus.com)
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see Component
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* @see LayoutManager
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* @since 1.0
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* @status updated to 1.14
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*/
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public class Dimension extends Dimension2D implements Serializable
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{
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/**
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* Compatible with JDK 1.0+.
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*/
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private static final long serialVersionUID = 4723952579491349524L;
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/**
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* The width of this object.
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*
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* @see #getSize()
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* @see #setSize(double, double)
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* @serial the width
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*/
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public int width;
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/**
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* The height of this object.
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*
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* @see #getSize()
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* @see #setSize(double, double)
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* @serial the height
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*/
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public int height;
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/**
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* Create a new Dimension with a width and height of zero.
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*/
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public Dimension()
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{
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}
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/**
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* Create a new Dimension with width and height identical to that of the
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* specified dimension.
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*
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* @param d the Dimension to copy
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* @throws NullPointerException if d is null
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*/
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public Dimension(Dimension d)
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{
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width = d.width;
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height = d.height;
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}
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/**
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* Create a new Dimension with the specified width and height.
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*
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* @param w the width of this object
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* @param h the height of this object
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*/
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public Dimension(int w, int h)
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{
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width = w;
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height = h;
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}
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/**
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* Gets the width of this dimension.
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*
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* @return the width, as a double
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*/
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public double getWidth()
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{
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return width;
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}
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/**
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* Gets the height of this dimension.
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*
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* @return the height, as a double
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*/
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public double getHeight()
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{
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return height;
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}
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/**
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* Sets the size of this dimension. The values are rounded to int.
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*
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* @param w the new width
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* @param h the new height
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* @since 1.2
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*/
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public void setSize(double w, double h)
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{
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width = (int) w;
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height = (int) h;
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}
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/**
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* Returns the size of this dimension. A pretty useless method, as this is
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* already a dimension.
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*
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* @return a copy of this dimension
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* @see #setSize(Dimension)
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* @since 1.1
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*/
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public Dimension getSize()
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{
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return new Dimension(width, height);
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}
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/**
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* Sets the width and height of this object to match that of the
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* specified object.
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*
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* @param d the Dimension to get the new width and height from
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* @throws NullPointerException if d is null
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* @see #getSize()
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* @since 1.1
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*/
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public void setSize(Dimension d)
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{
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width = d.width;
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height = d.height;
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}
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/**
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* Sets the width and height of this object to the specified values.
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*
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* @param w the new width value
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* @param h the new height value
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*/
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public void setSize(int w, int h)
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{
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width = w;
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height = h;
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}
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/**
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* Tests this object for equality against the specified object. This will
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* be true if and only if the specified object is an instance of
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* Dimension2D, and has the same width and height.
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*
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* @param obj the object to test against
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* @return true if the object is equal to this
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*/
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public boolean equals(Object obj)
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{
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if (! (obj instanceof Dimension))
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return false;
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Dimension dim = (Dimension) obj;
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return height == dim.height && width == dim.width;
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}
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/**
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* Return the hashcode for this object. It is not documented, but appears
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* to be <code>((width + height) * (width + height + 1) / 2) + width</code>.
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*
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* @return the hashcode
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*/
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public int hashCode()
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{
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// Reverse engineering this was fun!
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return (width + height) * (width + height + 1) / 2 + width;
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}
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/**
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* Returns a string representation of this object. The format is:
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* <code>getClass().getName() + "[width=" + width + ",height=" + height
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* + ']'</code>.
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*
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* @return a string representation of this object
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*/
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public String toString()
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{
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return getClass().getName()
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+ "[width=" + width + ",height=" + height + ']';
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}
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} // class Dimension
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