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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [awt/] [geom/] [Point2D.java] - Blame information for rev 771

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1 771 jeremybenn 
/* Point2D.java -- generic point in 2-D space
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   Copyright (C) 1999, 2000, 2002, 2004, 2006,  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.geom;
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/**
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 * This class implements a generic point in 2D Cartesian space. The storage
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 * representation is left up to the subclass. Point includes two useful
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 * nested classes, for float and double storage respectively.
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 *
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 * @author Per Bothner (bothner@cygnus.com)
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 * @author Eric Blake (ebb9@email.byu.edu)
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 * @since 1.2
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 * @status updated to 1.4
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 */
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public abstract class Point2D implements Cloneable
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{
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  /**
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   * The default constructor.
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   *
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   * @see java.awt.Point
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   * @see Point2D.Float
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   * @see Point2D.Double
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   */
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  protected Point2D()
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  {
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  }
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  /**
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   * Get the X coordinate, in double precision.
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   *
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   * @return the x coordinate
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   */
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  public abstract double getX();
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  /**
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   * Get the Y coordinate, in double precision.
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   *
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   * @return the y coordinate
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   */
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  public abstract double getY();
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  /**
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   * Set the location of this point to the new coordinates. There may be a
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   * loss of precision.
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   *
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   * @param x the new x coordinate
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   * @param y the new y coordinate
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   */
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  public abstract void setLocation(double x, double y);
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  /**
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   * Set the location of this point to the new coordinates. There may be a
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   * loss of precision.
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   *
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   * @param p the point to copy
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   * @throws NullPointerException if p is null
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   */
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  public void setLocation(Point2D p)
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  {
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    setLocation(p.getX(), p.getY());
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  }
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  /**
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   * Return the square of the distance between two points.
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   *
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   * @param x1 the x coordinate of point 1
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   * @param y1 the y coordinate of point 1
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   * @param x2 the x coordinate of point 2
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   * @param y2 the y coordinate of point 2
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   * @return (x2 - x1)^2 + (y2 - y1)^2
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   */
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  public static double distanceSq(double x1, double y1, double x2, double y2)
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  {
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    x2 -= x1;
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    y2 -= y1;
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    return x2 * x2 + y2 * y2;
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  }
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  /**
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   * Return the distance between two points.
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   *
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   * @param x1 the x coordinate of point 1
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   * @param y1 the y coordinate of point 1
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   * @param x2 the x coordinate of point 2
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   * @param y2 the y coordinate of point 2
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   * @return the distance from (x1,y1) to (x2,y2)
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   */
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  public static double distance(double x1, double y1, double x2, double y2)
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  {
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    return Math.sqrt(distanceSq(x1, y1, x2, y2));
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  }
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  /**
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   * Return the square of the distance from this point to the given one.
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   *
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   * @param x the x coordinate of the other point
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   * @param y the y coordinate of the other point
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   * @return the square of the distance
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   */
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  public double distanceSq(double x, double y)
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  {
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    return distanceSq(getX(), getY(), x, y);
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  }
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  /**
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   * Return the square of the distance from this point to the given one.
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   *
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   * @param p the other point
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   * @return the square of the distance
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   * @throws NullPointerException if p is null
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   */
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  public double distanceSq(Point2D p)
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  {
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    return distanceSq(getX(), getY(), p.getX(), p.getY());
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  }
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  /**
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   * Return the distance from this point to the given one.
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   *
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   * @param x the x coordinate of the other point
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   * @param y the y coordinate of the other point
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   * @return the distance
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   */
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  public double distance(double x, double y)
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  {
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    return distance(getX(), getY(), x, y);
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  }
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  /**
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   * Return the distance from this point to the given one.
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   *
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   * @param p the other point
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   * @return the distance
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   * @throws NullPointerException if p is null
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   */
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  public double distance(Point2D p)
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  {
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    return distance(getX(), getY(), p.getX(), p.getY());
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  }
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  /**
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   * Create a new point of the same run-time type with the same contents as
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   * this one.
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   *
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   * @return the clone
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   */
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  public Object clone()
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  {
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    try
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      {
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        return super.clone();
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      }
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    catch (CloneNotSupportedException e)
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      {
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        throw (Error) new InternalError().initCause(e); // Impossible
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      }
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  }
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  /**
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   * Return the hashcode for this point. The formula is not documented, but
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   * appears to be the same as:
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   * <pre>
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   * long l = Double.doubleToLongBits(getY());
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   * l = l * 31 ^ Double.doubleToLongBits(getX());
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   * return (int) ((l >> 32) ^ l);
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   * </pre>
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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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    // Talk about a fun time reverse engineering this one!
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    long l = java.lang.Double.doubleToLongBits(getY());
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    l = l * 31 ^ java.lang.Double.doubleToLongBits(getX());
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    return (int) ((l >> 32) ^ l);
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  }
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  /**
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   * Compares two points for equality. This returns true if they have the
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   * same coordinates.
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   *
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   * @param o the point to compare
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   * @return true if it is equal
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   */
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  public boolean equals(Object o)
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  {
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    if (! (o instanceof Point2D))
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      return false;
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    Point2D p = (Point2D) o;
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    return getX() == p.getX() && getY() == p.getY();
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  }
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  /**
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   * This class defines a point in <code>double</code> precision.
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   *
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   * @author Eric Blake (ebb9@email.byu.edu)
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   * @since 1.2
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   * @status updated to 1.4
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   */
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  public static class Double extends Point2D
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  {
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    /** The X coordinate. */
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    public double x;
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    /** The Y coordinate. */
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    public double y;
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    /**
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     * Create a new point at (0,0).
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     */
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    public Double()
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    {
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    }
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    /**
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     * Create a new point at (x,y).
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     *
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     * @param x the x coordinate
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     * @param y the y coordinate
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     */
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    public Double(double x, double 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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     * Return the x coordinate.
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     *
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     * @return the x coordinate
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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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     * Return the y coordinate.
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     *
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     * @return the y coordinate
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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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     * Sets the location of this point.
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     *
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     * @param x the new x coordinate
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     * @param y the new y coordinate
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     */
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    public void setLocation(double x, double 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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     * Returns a string representation of this object. The format is:
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     * <code>"Point2D.Double[" + x + ", " + y + ']'</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 "Point2D.Double[" + x + ", " + y + ']';
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    }
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  } // class Double
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  /**
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   * This class defines a point in <code>float</code> precision.
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   *
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   * @author Eric Blake (ebb9@email.byu.edu)
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   * @since 1.2
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   * @status updated to 1.4
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   */
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  public static class Float extends Point2D
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  {
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    /** The X coordinate. */
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    public float x;
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319 
    /** The Y coordinate. */
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    public float y;
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322 
    /**
323 
     * Create a new point at (0,0).
324 
     */
325 
    public Float()
326 
    {
327 
    }
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329 
    /**
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     * Create a new point at (x,y).
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     *
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     * @param x the x coordinate
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     * @param y the y coordinate
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     */
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    public Float(float x, float y)
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    {
337 
      this.x = x;
338 
      this.y = y;
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    }
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341 
    /**
342 
     * Return the x coordinate.
343 
     *
344 
     * @return the x coordinate
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     */
346 
    public double getX()
347 
    {
348 
      return x;
349 
    }
350 
 
351 
    /**
352 
     * Return the y coordinate.
353 
     *
354 
     * @return the y coordinate
355 
     */
356 
    public double getY()
357 
    {
358 
      return y;
359 
    }
360 
 
361 
    /**
362 
     * Sets the location of this point.
363 
     *
364 
     * @param x the new x coordinate
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     * @param y the new y coordinate
366 
     */
367 
    public void setLocation(double x, double y)
368 
    {
369 
      this.x = (float) x;
370 
      this.y = (float) y;
371 
    }
372 
 
373 
    /**
374 
     * Sets the location of this point.
375 
     *
376 
     * @param x the new x coordinate
377 
     * @param y the new y coordinate
378 
     */
379 
    public void setLocation(float x, float y)
380 
    {
381 
      this.x = x;
382 
      this.y = y;
383 
    }
384 
 
385 
    /**
386 
     * Returns a string representation of this object. The format is:
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     * <code>"Point2D.Float[" + x + ", " + y + ']'</code>.
388 
     *
389 
     * @return a string representation of this object
390 
     */
391 
    public String toString()
392 
    {
393 
      return "Point2D.Float[" + x + ", " + y + ']';
394 
    }
395 
  } // class Float
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} // class Point2D

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