1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 : * ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Mozilla Corporation code.
16 : *
17 : * The Initial Developer of the Original Code is Mozilla Foundation.
18 : * Portions created by the Initial Developer are Copyright (C) 2011
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : * Robert O'Callahan <robert@ocallahan.org>
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
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33 : * the provisions above, a recipient may use your version of this file under
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35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #ifndef MOZILLA_GFX_BASEPOINT_H_
39 : #define MOZILLA_GFX_BASEPOINT_H_
40 :
41 : namespace mozilla {
42 : namespace gfx {
43 :
44 : /**
45 : * Do not use this class directly. Subclass it, pass that subclass as the
46 : * Sub parameter, and only use that subclass. This allows methods to safely
47 : * cast 'this' to 'Sub*'.
48 : */
49 : template <class T, class Sub>
50 : struct BasePoint {
51 : T x, y;
52 :
53 : // Constructors
54 19 : BasePoint() : x(0), y(0) {}
55 18952 : BasePoint(T aX, T aY) : x(aX), y(aY) {}
56 :
57 19 : void MoveTo(T aX, T aY) { x = aX; y = aY; }
58 0 : void MoveBy(T aDx, T aDy) { x += aDx; y += aDy; }
59 :
60 : // Note that '=' isn't defined so we'll get the
61 : // compiler generated default assignment operator
62 :
63 0 : bool operator==(const Sub& aPoint) const {
64 0 : return x == aPoint.x && y == aPoint.y;
65 : }
66 0 : bool operator!=(const Sub& aPoint) const {
67 0 : return x != aPoint.x || y != aPoint.y;
68 : }
69 :
70 0 : Sub operator+(const Sub& aPoint) const {
71 0 : return Sub(x + aPoint.x, y + aPoint.y);
72 : }
73 0 : Sub operator-(const Sub& aPoint) const {
74 0 : return Sub(x - aPoint.x, y - aPoint.y);
75 : }
76 0 : Sub& operator+=(const Sub& aPoint) {
77 0 : x += aPoint.x;
78 0 : y += aPoint.y;
79 0 : return *static_cast<Sub*>(this);
80 : }
81 0 : Sub& operator-=(const Sub& aPoint) {
82 0 : x -= aPoint.x;
83 0 : y -= aPoint.y;
84 0 : return *static_cast<Sub*>(this);
85 : }
86 :
87 0 : Sub operator*(T aScale) const {
88 0 : return Sub(x * aScale, y * aScale);
89 : }
90 0 : Sub operator/(T aScale) const {
91 0 : return Sub(x / aScale, y / aScale);
92 : }
93 :
94 0 : Sub operator-() const {
95 0 : return Sub(-x, -y);
96 : }
97 : };
98 :
99 : }
100 : }
101 :
102 : #endif /* MOZILLA_GFX_BASEPOINT_H_ */
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