Transformation.hpp
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1 /*
2  * Original work Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
3  * Modified work Copyright (c) 2017 Louis Langholtz https://github.com/louis-langholtz/PlayRho
4  *
5  * This software is provided 'as-is', without any express or implied
6  * warranty. In no event will the authors be held liable for any damages
7  * arising from the use of this software.
8  *
9  * Permission is granted to anyone to use this software for any purpose,
10  * including commercial applications, and to alter it and redistribute it
11  * freely, subject to the following restrictions:
12  *
13  * 1. The origin of this software must not be misrepresented; you must not
14  * claim that you wrote the original software. If you use this software
15  * in a product, an acknowledgment in the product documentation would be
16  * appreciated but is not required.
17  * 2. Altered source versions must be plainly marked as such, and must not be
18  * misrepresented as being the original software.
19  * 3. This notice may not be removed or altered from any source distribution.
20  */
21 
22 #ifndef PLAYRHO_COMMON_TRANSFORMATION_HPP
23 #define PLAYRHO_COMMON_TRANSFORMATION_HPP
24 
25 #include <PlayRho/Common/Settings.hpp>
26 #include <PlayRho/Common/Vector2.hpp>
27 #include <PlayRho/Common/UnitVec.hpp>
28 
31 
32 namespace playrho {
33 namespace d2 {
34 
41 struct Transformation
42 {
43  Length2 p = Length2{};
44  UnitVec q = UnitVec::GetRight();
45 };
46 
48 PLAYRHO_CONSTEXPR const auto Transform_identity = Transformation{
49  Length2{0_m, 0_m}, UnitVec::GetRight()
50 };
51 
54 PLAYRHO_CONSTEXPR inline bool operator== (Transformation lhs, Transformation rhs) noexcept
55 {
56  return (lhs.p == rhs.p) && (lhs.q == rhs.q);
57 }
58 
61 PLAYRHO_CONSTEXPR inline bool operator!= (Transformation lhs, Transformation rhs) noexcept
62 {
63  return (lhs.p != rhs.p) || (lhs.q != rhs.q);
64 }
65 
66 } // namespace d2
67 
70 template <>
71 PLAYRHO_CONSTEXPR inline bool IsValid(const d2::Transformation& value) noexcept
72 {
73  return IsValid(value.p) && IsValid(value.q);
74 }
75 
76 } // namespace playrho
77 
78 #endif // PLAYRHO_COMMON_TRANSFORMATION_HPP