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 : * Matt Woodrow <mwoodrow@mozilla.com>
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
28 : * of those above. If you wish to allow use of your version of this file only
29 : * under the terms of either the GPL or the LGPL, and not to allow others to
30 : * use your version of this file under the terms of the MPL, indicate your
31 : * decision by deleting the provisions above and replace them with the notice
32 : * and other provisions required by the GPL or the LGPL. If you do not delete
33 : * the provisions above, a recipient may use your version of this file under
34 : * the terms of any one of the MPL, the GPL or the LGPL.
35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #ifndef MOZILLA_BASEPOINT4D_H_
39 : #define MOZILLA_BASEPOINT4D_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 BasePoint4D {
51 : T x, y, z, w;
52 :
53 : // Constructors
54 0 : BasePoint4D() : x(0), y(0), z(0), w(0) {}
55 0 : BasePoint4D(T aX, T aY, T aZ, T aW) : x(aX), y(aY), z(aZ), w(aW) {}
56 :
57 : void MoveTo(T aX, T aY, T aZ, T aW) { x = aX; y = aY; z = aZ; w = aW; }
58 : void MoveBy(T aDx, T aDy, T aDz, T aDw) { x += aDx; y += aDy; z += aDz; w += aDw; }
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 : return x == aPoint.x && y == aPoint.y &&
65 0 : z == aPoint.z && w == aPoint.w;
66 : }
67 : bool operator!=(const Sub& aPoint) const {
68 : return x != aPoint.x || y != aPoint.y ||
69 : z != aPoint.z || w != aPoint.w;
70 : }
71 :
72 0 : Sub operator+(const Sub& aPoint) const {
73 0 : return Sub(x + aPoint.x, y + aPoint.y, z + aPoint.z, w + aPoint.w);
74 : }
75 0 : Sub operator-(const Sub& aPoint) const {
76 0 : return Sub(x - aPoint.x, y - aPoint.y, z - aPoint.z, w - aPoint.w);
77 : }
78 0 : Sub& operator+=(const Sub& aPoint) {
79 0 : x += aPoint.x;
80 0 : y += aPoint.y;
81 0 : z += aPoint.z;
82 0 : w += aPoint.w;
83 0 : return *static_cast<Sub*>(this);
84 : }
85 0 : Sub& operator-=(const Sub& aPoint) {
86 0 : x -= aPoint.x;
87 0 : y -= aPoint.y;
88 0 : z -= aPoint.z;
89 0 : w -= aPoint.w;
90 0 : return *static_cast<Sub*>(this);
91 : }
92 :
93 0 : Sub operator*(T aScale) const {
94 0 : return Sub(x * aScale, y * aScale, z * aScale, w * aScale);
95 : }
96 : Sub operator/(T aScale) const {
97 : return Sub(x / aScale, y / aScale, z / aScale, w / aScale);
98 : }
99 :
100 0 : Sub& operator*=(T aScale) {
101 0 : x *= aScale;
102 0 : y *= aScale;
103 0 : z *= aScale;
104 0 : w *= aScale;
105 0 : return *static_cast<Sub*>(this);
106 : }
107 :
108 0 : Sub& operator/=(T aScale) {
109 0 : x /= aScale;
110 0 : y /= aScale;
111 0 : z /= aScale;
112 0 : w /= aScale;
113 0 : return *static_cast<Sub*>(this);
114 : }
115 :
116 : Sub operator-() const {
117 : return Sub(-x, -y, -z, -w);
118 : }
119 :
120 0 : T& operator[](int aIndex) {
121 0 : NS_ABORT_IF_FALSE(aIndex >= 0 && aIndex <= 3, "Invalid array index");
122 0 : return *((&x)+aIndex);
123 : }
124 :
125 0 : const T& operator[](int aIndex) const {
126 0 : NS_ABORT_IF_FALSE(aIndex >= 0 && aIndex <= 3, "Invalid array index");
127 0 : return *((&x)+aIndex);
128 : }
129 :
130 0 : T DotProduct(const Sub& aPoint) const {
131 0 : return x * aPoint.x + y * aPoint.y + z * aPoint.z + w * aPoint.w;
132 : }
133 :
134 : // Ignores the 4th component!
135 0 : Sub CrossProduct(const Sub& aPoint) const {
136 : return Sub(y * aPoint.z - aPoint.y * z,
137 : z * aPoint.x - aPoint.z * x,
138 : x * aPoint.y - aPoint.x * y,
139 0 : 0);
140 : }
141 :
142 0 : T Length() const {
143 0 : return sqrt(x*x + y*y + z*z + w*w);
144 : }
145 :
146 : void Normalize() {
147 : *this /= Length();
148 : }
149 : };
150 :
151 : }
152 : }
153 :
154 : #endif /* MOZILLA_BASEPOINT4D_H_ */
|