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comparison dwt/graphics/Point.d @ 0:380af2bdd8e5

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author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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-1:000000000000 0:380af2bdd8e5
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 module dwt.graphics.Point;
12
13 import dwt.dwthelper.utils;
14
15 import dwt.internal.SerializableCompatibility;
16
17 /**
18 * Instances of this class represent places on the (x, y)
19 * coordinate plane.
20 * <p>
21 * The coordinate space for rectangles and points is considered
22 * to have increasing values downward and to the right from its
23 * origin making this the normal, computer graphics oriented notion
24 * of (x, y) coordinates rather than the strict mathematical one.
25 * </p>
26 * <p>
27 * The hashCode() method in this class uses the values of the public
28 * fields to compute the hash value. When storing instances of the
29 * class in hashed collections, do not modify these fields after the
30 * object has been inserted.
31 * </p>
32 * <p>
33 * Application code does <em>not</em> need to explicitly release the
34 * resources managed by each instance when those instances are no longer
35 * required, and thus no <code>dispose()</code> method is provided.
36 * </p>
37 *
38 * @see Rectangle
39 */
40
41 public final class Point implements SerializableCompatibility {
42
43 /**
44 * the x coordinate of the point
45 */
46 public int x;
47
48 /**
49 * the y coordinate of the point
50 */
51 public int y;
52
53 static final long serialVersionUID = 3257002163938146354L;
54
55 /**
56 * Constructs a new point with the given x and y coordinates.
57 *
58 * @param x the x coordinate of the new point
59 * @param y the y coordinate of the new point
60 */
61 public Point (int x, int y) {
62 this.x = x;
63 this.y = y;
64 }
65
66 /**
67 * Compares the argument to the receiver, and returns true
68 * if they represent the <em>same</em> object using a class
69 * specific comparison.
70 *
71 * @param object the object to compare with this object
72 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
73 *
74 * @see #hashCode()
75 */
76 public bool equals (Object object) {
77 if (object is this) return true;
78 if (!(object instanceof Point)) return false;
79 Point p = (Point)object;
80 return (p.x is this.x) && (p.y is this.y);
81 }
82
83 /**
84 * Returns an integer hash code for the receiver. Any two
85 * objects that return <code>true</code> when passed to
86 * <code>equals</code> must return the same value for this
87 * method.
88 *
89 * @return the receiver's hash
90 *
91 * @see #equals(Object)
92 */
93 public int hashCode () {
94 return x ^ y;
95 }
96
97 /**
98 * Returns a string containing a concise, human-readable
99 * description of the receiver.
100 *
101 * @return a string representation of the point
102 */
103 public String toString () {
104 return "Point {" + x + ", " + y + "}"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
105 }
106
107 }
108