EdgeShapeConf.cpp
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1 /*
2  * Original work Copyright (c) 2006-2010 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  * Permission is granted to anyone to use this software for any purpose,
9  * including commercial applications, and to alter it and redistribute it
10  * freely, subject to the following restrictions:
11  * 1. The origin of this software must not be misrepresented; you must not
12  * claim that you wrote the original software. If you use this software
13  * in a product, an acknowledgment in the product documentation would be
14  * appreciated but is not required.
15  * 2. Altered source versions must be plainly marked as such, and must not be
16  * misrepresented as being the original software.
17  * 3. This notice may not be removed or altered from any source distribution.
18  */
19 
20 #include <PlayRho/Collision/Shapes/EdgeShapeConf.hpp>
21 
22 namespace playrho {
23 namespace d2 {
24 
25 EdgeShapeConf::EdgeShapeConf(Length2 vA, Length2 vB, const EdgeShapeConf& conf) noexcept:
26  ShapeBuilder{conf}, vertexRadius{conf.vertexRadius}, m_vertices{vA, vB}
27 {
28  const auto normal = GetUnitVector(GetFwdPerpendicular(vB - vA));
29  m_normals[0] = normal;
30  m_normals[1] = -normal;
31 }
32 
33 EdgeShapeConf& EdgeShapeConf::Set(Length2 vA, Length2 vB) noexcept
34 {
35  m_vertices[0] = vA;
36  m_vertices[1] = vB;
37  const auto normal = GetUnitVector(GetFwdPerpendicular(vB - vA));
38  m_normals[0] = normal;
39  m_normals[1] = -normal;
40  return *this;
41 }
42 
43 EdgeShapeConf& EdgeShapeConf::Transform(const Mat22& m) noexcept
44 {
45  const auto newA = m * GetVertexA();
46  const auto newB = m * GetVertexB();
47  return Set(newA, newB);
48 }
49 
50 } // namespace d2
51 } // namespace playrho