750 lines
21 KiB
Java
750 lines
21 KiB
Java
/* Rectangle.java -- represents a graphics rectangle
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Copyright (C) 1999, 2000, 2001, 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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.Rectangle2D;
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import java.io.Serializable;
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/**
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* This class represents a rectangle and all the interesting things you
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* might want to do with it. Note that the coordinate system uses
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* the origin (0,0) as the top left of the screen, with the x and y
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* values increasing as they move to the right and down respectively.
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*
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* <p>It is valid for a rectangle to have negative width or height; but it
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* is considered to have no area or internal points. Therefore, the behavior
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* in methods like <code>contains</code> or <code>intersects</code> is
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* undefined unless the rectangle has positive width and height.
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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 NullPointerException,
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* ArrayIndexOutOfBoundsException, or invalid results. Also, this class is
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* not threadsafe.
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*
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* @author Warren Levy <warrenl@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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* @since 1.0
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* @status updated to 1.4
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*/
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public class Rectangle extends Rectangle2D implements Shape, 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 = -4345857070255674764L;
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/**
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* The X coordinate of the top-left corner of the rectangle.
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*
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* @see #setLocation(int, int)
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* @see #getLocation()
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* @serial the x coordinate
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*/
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public int x;
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/**
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* The Y coordinate of the top-left corner of the rectangle.
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*
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* @see #setLocation(int, int)
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* @see #getLocation()
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* @serial the y coordinate
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*/
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public int y;
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/**
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* The width of the rectangle.
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*
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* @see #setSize(int, int)
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* @see #getSize()
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* @serial
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*/
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public int width;
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/**
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* The height of the rectangle.
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*
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* @see #setSize(int, int)
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* @see #getSize()
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* @serial
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*/
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public int height;
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/**
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* Initializes a new instance of <code>Rectangle</code> with a top
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* left corner at (0,0) and a width and height of 0.
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*/
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public Rectangle()
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{
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}
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/**
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* Initializes a new instance of <code>Rectangle</code> from the
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* coordinates of the specified rectangle.
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*
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* @param r the rectangle to copy from
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* @throws NullPointerException if r is null
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* @since 1.1
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*/
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public Rectangle(Rectangle r)
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{
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x = r.x;
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y = r.y;
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width = r.width;
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height = r.height;
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}
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/**
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* Initializes a new instance of <code>Rectangle</code> from the specified
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* inputs.
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*
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* @param x the X coordinate of the top left corner
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* @param y the Y coordinate of the top left corner
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* @param width the width of the rectangle
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* @param height the height of the rectangle
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*/
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public Rectangle(int x, int y, int width, int height)
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{
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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/**
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* Initializes a new instance of <code>Rectangle</code> with the specified
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* width and height. The upper left corner of the rectangle will be at
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* the origin (0,0).
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*
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* @param width the width of the rectangle
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* @param height the height of the rectange
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*/
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public Rectangle(int width, int height)
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{
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this.width = width;
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this.height = height;
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}
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/**
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* Initializes a new instance of <code>Rectangle</code> with a top-left
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* corner represented by the specified point and the width and height
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* represented by the specified dimension.
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*
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* @param p the upper left corner of the rectangle
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* @param d the width and height of the rectangle
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* @throws NullPointerException if p or d is null
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*/
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public Rectangle(Point p, Dimension d)
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{
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x = p.x;
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y = p.y;
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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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* Initializes a new instance of <code>Rectangle</code> with a top left
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* corner at the specified point and a width and height of zero.
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*
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* @param p the upper left corner of the rectangle
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*/
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public Rectangle(Point p)
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{
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x = p.x;
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y = p.y;
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}
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/**
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* Initializes a new instance of <code>Rectangle</code> with an
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* upper left corner at the origin (0,0) and a width and height represented
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* by the specified dimension.
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*
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* @param d the width and height of the rectangle
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*/
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public Rectangle(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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* Get the X coordinate of the upper-left corner.
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*
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* @return the value of x, as a double
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*/
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public double getX()
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{
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return x;
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}
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/**
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* Get the Y coordinate of the upper-left corner.
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*
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* @return the value of y, as a double
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*/
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public double getY()
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{
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return y;
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}
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/**
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* Get the width of the rectangle.
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*
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* @return the value of 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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* Get the height of the rectangle.
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*
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* @return the value of 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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* Returns the bounds of this rectangle. A pretty useless method, as this
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* is already a rectangle; it is included to mimic the
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* <code>getBounds</code> method in Component.
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*
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* @return a copy of this rectangle
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* @see #setBounds(Rectangle)
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* @since 1.1
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*/
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public Rectangle getBounds()
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{
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return new Rectangle(this);
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}
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/**
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* Returns the high-precision bounds of this rectangle. A pretty useless
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* method, as this is already a rectangle.
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*
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* @return a copy of this rectangle
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* @see #setBounds(Rectangle)
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* @since 1.2
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*/
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public Rectangle2D getBounds2D()
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{
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return new Rectangle(x, y, width, height);
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}
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/**
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* Updates this rectangle to match the dimensions of the specified
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* rectangle.
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*
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* @param r the rectangle to update from
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* @throws NullPointerException if r is null
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* @see #setBounds(int, int, int, int)
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* @since 1.1
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*/
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public void setBounds(Rectangle r)
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{
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setBounds (r.x, r.y, r.width, r.height);
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}
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/**
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* Updates this rectangle to have the specified dimensions.
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*
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* @param x the new X coordinate of the upper left hand corner
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* @param y the new Y coordinate of the upper left hand corner
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* @param width the new width of this rectangle
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* @param height the new height of this rectangle
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* @since 1.1
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*/
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public void setBounds(int x, int y, int width, int height)
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{
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reshape (x, y, width, height);
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}
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/**
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* Updates this rectangle to have the specified dimensions, as rounded to
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* integers.
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*
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* @param x the new X coordinate of the upper left hand corner
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* @param y the new Y coordinate of the upper left hand corner
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* @param width the new width of this rectangle
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* @param height the new height of this rectangle
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* @since 1.2
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*/
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public void setRect(double x, double y, double width, double height)
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{
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this.x = (int) x;
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this.y = (int) y;
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this.width = (int) width;
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this.height = (int) height;
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}
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/**
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* Updates this rectangle to have the specified dimensions.
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*
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* @param x the new X coordinate of the upper left hand corner
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* @param y the new Y coordinate of the upper left hand corner
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* @param width the new width of this rectangle
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* @param height the new height of this rectangle
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* @deprecated use {@link #setBounds(int, int, int, int)} instead
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*/
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public void reshape(int x, int y, int width, int height)
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{
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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/**
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* Returns the location of this rectangle, which is the coordinates of
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* its upper left corner.
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*
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* @return the point where this rectangle is located
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* @see setLocation(Point)
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* @since 1.1
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*/
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public Point getLocation()
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{
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return new Point(x,y);
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}
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/**
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* Moves the location of this rectangle by setting its upper left
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* corner to the specified point.
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*
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* @param p the point to move the rectangle to
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* @throws NullPointerException if p is null
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* @see #getLocation()
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* @since 1.1
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*/
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public void setLocation(Point p)
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{
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setLocation (p.x, p.y);
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}
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/**
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* Moves the location of this rectangle by setting its upper left
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* corner to the specified coordinates.
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*
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* @param x the new X coordinate for this rectangle
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* @param y the new Y coordinate for this rectangle
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* @since 1.1
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*/
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public void setLocation(int x, int y)
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{
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move (x, y);
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}
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/**
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* Moves the location of this rectangle by setting its upper left
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* corner to the specified coordinates.
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*
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* @param x the new X coordinate for this rectangle
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* @param y the new Y coordinate for this rectangle
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* @deprecated use {@link #setLocation(int, int)} instead
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*/
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public void move(int x, int y)
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{
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this.x = x;
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this.y = y;
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}
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/**
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* Translate the location of this rectangle by the given amounts.
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*
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* @param dx the x distance to move by
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* @param dy the y distance to move by
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* @see #setLocation(int, int)
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*/
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public void translate(int dx, int dy)
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{
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x += dx;
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y += dy;
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}
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/**
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* Returns the size of this rectangle.
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*
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* @return the size of this rectangle
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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 size of this rectangle based on the specified dimensions.
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*
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* @param d the new dimensions of the rectangle
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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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setSize (d.width, d.height);
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}
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/**
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* Sets the size of this rectangle based on the specified dimensions.
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*
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* @param width the new width of the rectangle
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* @param height the new height of the rectangle
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* @since 1.1
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*/
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public void setSize(int width, int height)
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{
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resize (width, height);
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}
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/**
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* Sets the size of this rectangle based on the specified dimensions.
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*
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* @param width the new width of the rectangle
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* @param height the new height of the rectangle
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* @deprecated use {@link #setSize(int, int)} instead
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*/
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public void resize(int width, int height)
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{
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this.width = width;
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this.height = height;
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}
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/**
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* Tests whether or not the specified point is inside this rectangle.
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* According to the contract of Shape, a point on the border is in only if
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* it has an adjacent point inside the rectangle in either the increasing
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* x or y direction.
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*
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* @param p the point to test
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* @return true if the point is inside the rectangle
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* @throws NullPointerException if p is null
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* @see #contains(int, int)
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* @since 1.1
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*/
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public boolean contains(Point p)
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{
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return contains (p.x, p.y);
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}
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/**
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* Tests whether or not the specified point is inside this rectangle.
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* According to the contract of Shape, a point on the border is in only if
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* it has an adjacent point inside the rectangle in either the increasing
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* x or y direction.
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*
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* @param x the X coordinate of the point to test
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* @param y the Y coordinate of the point to test
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* @return true if the point is inside the rectangle
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* @since 1.1
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*/
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public boolean contains(int x, int y)
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{
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return inside (x, y);
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}
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/**
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* Checks whether all points in the given rectangle are contained in this
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* rectangle.
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*
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* @param r the rectangle to check
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* @return true if r is contained in this rectangle
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* @throws NullPointerException if r is null
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* @see #contains(int, int, int, int)
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* @since 1.1
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*/
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public boolean contains(Rectangle r)
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{
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return contains (r.x, r.y, r.width, r.height);
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}
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/**
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* Checks whether all points in the given rectangle are contained in this
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* rectangle.
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*
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* @param x the x coordinate of the rectangle to check
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* @param y the y coordinate of the rectangle to check
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* @param w the width of the rectangle to check
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* @param h the height of the rectangle to check
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* @return true if the parameters are contained in this rectangle
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* @since 1.1
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*/
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public boolean contains(int x, int y, int w, int h)
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{
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return width > 0 && height > 0 && w > 0 && h > 0
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&& x >= this.x && x + w <= this.x + this.width
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&& y >= this.y && y + h <= this.y + this.height;
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}
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/**
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* Tests whether or not the specified point is inside this rectangle.
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*
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* @param x the X coordinate of the point to test
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* @param y the Y coordinate of the point to test
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* @return true if the point is inside the rectangle
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* @deprecated use {@link #contains(int, int)} instead
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*/
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public boolean inside(int x, int y)
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{
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return width > 0 && height > 0
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&& x >= this.x && x < this.x + width
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&& y >= this.y && y < this.y + height;
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}
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/**
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* Tests whether or not the specified rectangle intersects this rectangle.
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* This means the two rectangles share at least one internal point.
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*
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* @param r the rectangle to test against
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* @return true if the specified rectangle intersects this one
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* @throws NullPointerException if r is null
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* @since 1.2
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*/
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public boolean intersects(Rectangle r)
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{
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return r.width > 0 && r.height > 0 && width > 0 && height > 0
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&& r.x < x + width && r.x + r.width > x
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&& r.y < y + height && r.y + r.height > y;
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}
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/**
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* Determines the rectangle which is formed by the intersection of this
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* rectangle with the specified rectangle. If the two do not intersect,
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* an empty rectangle will be returned (meaning the width and/or height
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* will be non-positive).
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*
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* @param r the rectange to calculate the intersection with
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* @return a new rectangle bounding the intersection
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* @throws NullPointerException if r is null
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*/
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public Rectangle intersection(Rectangle r)
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{
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Rectangle res = new Rectangle();
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intersect(this, r, res);
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return res;
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}
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/**
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* Returns the smallest rectangle that contains both this rectangle
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* and the specified rectangle.
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*
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* @param r the rectangle to compute the union with
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* @return the smallest rectangle containing both rectangles
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* @throws NullPointerException if r is null
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*/
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|
public Rectangle union(Rectangle r)
|
|
{
|
|
Rectangle res = new Rectangle();
|
|
union(this, r, res);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* Modifies this rectangle so that it represents the smallest rectangle
|
|
* that contains both the existing rectangle and the specified point.
|
|
* However, if the point falls on one of the two borders which are not
|
|
* inside the rectangle, a subsequent call to <code>contains</code> may
|
|
* return false.
|
|
*
|
|
* @param x the X coordinate of the point to add to this rectangle
|
|
* @param y the Y coordinate of the point to add to this rectangle
|
|
*/
|
|
public void add(int x, int y)
|
|
{
|
|
add((double) x, (double) y);
|
|
}
|
|
|
|
/**
|
|
* Modifies this rectangle so that it represents the smallest rectangle
|
|
* that contains both the existing rectangle and the specified point.
|
|
* However, if the point falls on one of the two borders which are not
|
|
* inside the rectangle, a subsequent call to <code>contains</code> may
|
|
* return false.
|
|
*
|
|
* @param p the point to add to this rectangle
|
|
* @throws NullPointerException if p is null
|
|
*/
|
|
public void add(Point p)
|
|
{
|
|
add((double) p.x, (double) p.y);
|
|
}
|
|
|
|
/**
|
|
* Modifies this rectangle so that it represents the smallest rectangle
|
|
* that contains both the existing rectangle and the specified rectangle.
|
|
*
|
|
* @param r the rectangle to add to this rectangle
|
|
* @throws NullPointerException if r is null
|
|
* @see #union(Rectangle)
|
|
*/
|
|
public void add(Rectangle r)
|
|
{
|
|
union(this, r, this);
|
|
}
|
|
|
|
/**
|
|
* Expands the rectangle by the specified amount. The horizontal
|
|
* and vertical expansion values are applied both to the X,Y coordinate
|
|
* of this rectangle, and its width and height. Thus the width and
|
|
* height will increase by 2h and 2v accordingly.
|
|
*
|
|
* @param h the horizontal expansion value
|
|
* @param v the vertical expansion value
|
|
*/
|
|
public void grow(int h, int v)
|
|
{
|
|
x -= h;
|
|
y -= v;
|
|
width += h + h;
|
|
height += v + v;
|
|
}
|
|
|
|
/**
|
|
* Tests whether or not this rectangle is empty. An empty rectangle
|
|
* has a non-positive width or height.
|
|
*
|
|
* @return true if the rectangle is empty
|
|
*/
|
|
public boolean isEmpty()
|
|
{
|
|
return width <= 0 || height <= 0;
|
|
}
|
|
|
|
/**
|
|
* Determine where the point lies with respect to this rectangle. The
|
|
* result will be the binary OR of the appropriate bit masks.
|
|
*
|
|
* @param x the x coordinate to check
|
|
* @param y the y coordinate to check
|
|
* @return the binary OR of the result
|
|
* @see #OUT_LEFT
|
|
* @see #OUT_TOP
|
|
* @see #OUT_RIGHT
|
|
* @see #OUT_BOTTOM
|
|
* @since 1.2
|
|
*/
|
|
public int outcode(double x, double y)
|
|
{
|
|
int result = 0;
|
|
if (width <= 0)
|
|
result |= OUT_LEFT | OUT_RIGHT;
|
|
else if (x < this.x)
|
|
result |= OUT_LEFT;
|
|
else if (x > this.x + width)
|
|
result |= OUT_RIGHT;
|
|
if (height <= 0)
|
|
result |= OUT_BOTTOM | OUT_TOP;
|
|
else if (y < this.y) // Remember that +y heads top-to-bottom.
|
|
result |= OUT_TOP;
|
|
else if (y > this.y + height)
|
|
result |= OUT_BOTTOM;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Determines the rectangle which is formed by the intersection of this
|
|
* rectangle with the specified rectangle. If the two do not intersect,
|
|
* an empty rectangle will be returned (meaning the width and/or height
|
|
* will be non-positive).
|
|
*
|
|
* @param r the rectange to calculate the intersection with
|
|
* @return a new rectangle bounding the intersection
|
|
* @throws NullPointerException if r is null
|
|
* @since 1.2
|
|
*/
|
|
public Rectangle2D createIntersection(Rectangle2D r)
|
|
{
|
|
// Favor runtime type of other rectangle.
|
|
Rectangle2D res = r.getBounds2D();
|
|
intersect(this, r, res);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* Returns the smallest rectangle that contains both this rectangle
|
|
* and the specified rectangle.
|
|
*
|
|
* @param r the rectangle to compute the union with
|
|
* @return the smallest rectangle containing both rectangles
|
|
* @throws NullPointerException if r is null
|
|
* @since 1.2
|
|
*/
|
|
public Rectangle2D createUnion(Rectangle2D r)
|
|
{
|
|
// Favor runtime type of other rectangle.
|
|
Rectangle2D res = r.getBounds2D();
|
|
union(this, r, res);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* Tests this rectangle for equality against the specified object. This
|
|
* will be true if an only if the specified object is an instance of
|
|
* Rectangle2D with the same coordinates and dimensions.
|
|
*
|
|
* @param obj the object to test against for equality
|
|
* @return true if the specified object is equal to this one
|
|
*/
|
|
public boolean equals(Object obj)
|
|
{
|
|
if (! (obj instanceof Rectangle2D))
|
|
return false;
|
|
Rectangle2D r = (Rectangle2D) obj;
|
|
return r.getX() == x && r.getY() == y
|
|
&& r.getWidth() == width && r.getHeight() == height;
|
|
}
|
|
|
|
/**
|
|
* Returns a string representation of this rectangle. This is in the form
|
|
* <code>getClass().getName() + "[x=" + x + ",y=" + y + ",width=" + width
|
|
* + ",height=" + height + ']'</code>.
|
|
*
|
|
* @return a string representation of this rectangle
|
|
*/
|
|
public String toString()
|
|
{
|
|
return getClass().getName() + "[x=" + x + ",y=" + y + ",width=" + width
|
|
+ ",height=" + height + ']';
|
|
}
|
|
} // class Rectangle
|