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authorTom Tromey <tromey@gcc.gnu.org>2005-07-16 00:30:23 +0000
committerTom Tromey <tromey@gcc.gnu.org>2005-07-16 00:30:23 +0000
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treea0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/awt/Dimension.java
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+/* Dimension.java -- represents a 2-dimensional span
+ Copyright (C) 1999, 2000, 2002 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt;
+
+import java.awt.geom.Dimension2D;
+import java.io.Serializable;
+
+/**
+ * This class holds a width and height value pair. This is used in plenty
+ * of windowing classes, but also has geometric meaning.
+ *
+ * <p>It is valid for a dimension to have negative width or height; but it
+ * is considered to have no area. Therefore, the behavior in various methods
+ * is undefined in such a case.
+ *
+ * <p>There are some public fields; if you mess with them in an inconsistent
+ * manner, it is your own fault when you get invalid results. Also, this
+ * class is not threadsafe.
+ *
+ * @author Per Bothner (bothner@cygnus.com)
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @see Component
+ * @see LayoutManager
+ * @since 1.0
+ * @status updated to 1.14
+ */
+public class Dimension extends Dimension2D implements Serializable
+{
+ /**
+ * Compatible with JDK 1.0+.
+ */
+ private static final long serialVersionUID = 4723952579491349524L;
+
+ /**
+ * The width of this object.
+ *
+ * @see #getSize()
+ * @see #setSize(double, double)
+ * @serial the width
+ */
+ public int width;
+
+ /**
+ * The height of this object.
+ *
+ * @see #getSize()
+ * @see #setSize(double, double)
+ * @serial the height
+ */
+ public int height;
+
+ /**
+ * Create a new Dimension with a width and height of zero.
+ */
+ public Dimension()
+ {
+ }
+
+ /**
+ * Create a new Dimension with width and height identical to that of the
+ * specified dimension.
+ *
+ * @param d the Dimension to copy
+ * @throws NullPointerException if d is null
+ */
+ public Dimension(Dimension d)
+ {
+ width = d.width;
+ height = d.height;
+ }
+
+ /**
+ * Create a new Dimension with the specified width and height.
+ *
+ * @param w the width of this object
+ * @param h the height of this object
+ */
+ public Dimension(int w, int h)
+ {
+ width = w;
+ height = h;
+ }
+
+ /**
+ * Gets the width of this dimension.
+ *
+ * @return the width, as a double
+ */
+ public double getWidth()
+ {
+ return width;
+ }
+
+ /**
+ * Gets the height of this dimension.
+ *
+ * @return the height, as a double
+ */
+ public double getHeight()
+ {
+ return height;
+ }
+
+ /**
+ * Sets the size of this dimension. The values are rounded to int.
+ *
+ * @param w the new width
+ * @param h the new height
+ * @since 1.2
+ */
+ public void setSize(double w, double h)
+ {
+ width = (int) w;
+ height = (int) h;
+ }
+
+ /**
+ * Returns the size of this dimension. A pretty useless method, as this is
+ * already a dimension.
+ *
+ * @return a copy of this dimension
+ * @see #setSize(Dimension)
+ * @since 1.1
+ */
+ public Dimension getSize()
+ {
+ return new Dimension(width, height);
+ }
+
+ /**
+ * Sets the width and height of this object to match that of the
+ * specified object.
+ *
+ * @param d the Dimension to get the new width and height from
+ * @throws NullPointerException if d is null
+ * @see #getSize()
+ * @since 1.1
+ */
+ public void setSize(Dimension d)
+ {
+ width = d.width;
+ height = d.height;
+ }
+
+ /**
+ * Sets the width and height of this object to the specified values.
+ *
+ * @param w the new width value
+ * @param h the new height value
+ */
+ public void setSize(int w, int h)
+ {
+ width = w;
+ height = h;
+ }
+
+ /**
+ * Tests this object for equality against the specified object. This will
+ * be true if and only if the specified object is an instance of
+ * Dimension2D, and has the same width and height.
+ *
+ * @param obj the object to test against
+ * @return true if the object is equal to this
+ */
+ public boolean equals(Object obj)
+ {
+ if (! (obj instanceof Dimension))
+ return false;
+ Dimension dim = (Dimension) obj;
+ return height == dim.height && width == dim.width;
+ }
+
+ /**
+ * Return the hashcode for this object. It is not documented, but appears
+ * to be <code>((width + height) * (width + height + 1) / 2) + width</code>.
+ *
+ * @return the hashcode
+ */
+ public int hashCode()
+ {
+ // Reverse engineering this was fun!
+ return (width + height) * (width + height + 1) / 2 + width;
+ }
+
+ /**
+ * Returns a string representation of this object. The format is:
+ * <code>getClass().getName() + "[width=" + width + ",height=" + height
+ * + ']'</code>.
+ *
+ * @return a string representation of this object
+ */
+ public String toString()
+ {
+ return getClass().getName()
+ + "[width=" + width + ",height=" + height + ']';
+ }
+} // class Dimension