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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.graphics.Point;
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12
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.internal.SerializableCompatibility;
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16
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17 /**
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18 * Instances of this class represent places on the (x, y)
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19 * coordinate plane.
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20 * <p>
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21 * The coordinate space for rectangles and points is considered
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22 * to have increasing values downward and to the right from its
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23 * origin making this the normal, computer graphics oriented notion
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24 * of (x, y) coordinates rather than the strict mathematical one.
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25 * </p>
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26 * <p>
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27 * The hashCode() method in this class uses the values of the public
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28 * fields to compute the hash value. When storing instances of the
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29 * class in hashed collections, do not modify these fields after the
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30 * object has been inserted.
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31 * </p>
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32 * <p>
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33 * Application code does <em>not</em> need to explicitly release the
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34 * resources managed by each instance when those instances are no longer
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35 * required, and thus no <code>dispose()</code> method is provided.
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36 * </p>
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37 *
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38 * @see Rectangle
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39 */
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40
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41 public final class Point implements SerializableCompatibility {
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42
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43 /**
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44 * the x coordinate of the point
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45 */
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46 public int x;
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47
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48 /**
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49 * the y coordinate of the point
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50 */
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51 public int y;
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52
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53 static final long serialVersionUID = 3257002163938146354L;
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54
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55 /**
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56 * Constructs a new point with the given x and y coordinates.
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57 *
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58 * @param x the x coordinate of the new point
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59 * @param y the y coordinate of the new point
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60 */
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61 public Point (int x, int y) {
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62 this.x = x;
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63 this.y = y;
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64 }
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65
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66 /**
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67 * Compares the argument to the receiver, and returns true
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68 * if they represent the <em>same</em> object using a class
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69 * specific comparison.
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70 *
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71 * @param object the object to compare with this object
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72 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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73 *
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74 * @see #hashCode()
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75 */
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76 public bool equals (Object object) {
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77 if (object is this) return true;
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78 if (!(object instanceof Point)) return false;
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79 Point p = (Point)object;
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80 return (p.x is this.x) && (p.y is this.y);
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81 }
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82
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83 /**
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84 * Returns an integer hash code for the receiver. Any two
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85 * objects that return <code>true</code> when passed to
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86 * <code>equals</code> must return the same value for this
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87 * method.
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88 *
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89 * @return the receiver's hash
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90 *
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91 * @see #equals(Object)
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92 */
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93 public int hashCode () {
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94 return x ^ y;
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95 }
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96
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97 /**
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98 * Returns a string containing a concise, human-readable
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99 * description of the receiver.
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100 *
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101 * @return a string representation of the point
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102 */
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103 public String toString () {
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104 return "Point {" + x + ", " + y + "}"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
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105 }
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106
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107 }
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108