b2ChainAndCircleContact.cpp
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00001 /*
00002 * Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
00003 *
00004 * This software is provided 'as-is', without any express or implied
00005 * warranty.  In no event will the authors be held liable for any damages
00006 * arising from the use of this software.
00007 * Permission is granted to anyone to use this software for any purpose,
00008 * including commercial applications, and to alter it and redistribute it
00009 * freely, subject to the following restrictions:
00010 * 1. The origin of this software must not be misrepresented; you must not
00011 * claim that you wrote the original software. If you use this software
00012 * in a product, an acknowledgment in the product documentation would be
00013 * appreciated but is not required.
00014 * 2. Altered source versions must be plainly marked as such, and must not be
00015 * misrepresented as being the original software.
00016 * 3. This notice may not be removed or altered from any source distribution.
00017 */
00018 
00019 #include <Box2D/Dynamics/Contacts/b2ChainAndCircleContact.h>
00020 #include <Box2D/Common/b2BlockAllocator.h>
00021 #include <Box2D/Dynamics/b2Fixture.h>
00022 #include <Box2D/Collision/Shapes/b2ChainShape.h>
00023 #include <Box2D/Collision/Shapes/b2EdgeShape.h>
00024 
00025 #include <new>
00026 
00027 b2Contact* b2ChainAndCircleContact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
00028 {
00029         void* mem = allocator->Allocate(sizeof(b2ChainAndCircleContact));
00030         return new (mem) b2ChainAndCircleContact(fixtureA, indexA, fixtureB, indexB);
00031 }
00032 
00033 void b2ChainAndCircleContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
00034 {
00035         ((b2ChainAndCircleContact*)contact)->~b2ChainAndCircleContact();
00036         allocator->Free(contact, sizeof(b2ChainAndCircleContact));
00037 }
00038 
00039 b2ChainAndCircleContact::b2ChainAndCircleContact(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB)
00040 : b2Contact(fixtureA, indexA, fixtureB, indexB)
00041 {
00042         b2Assert(m_fixtureA->GetType() == b2Shape::e_chain);
00043         b2Assert(m_fixtureB->GetType() == b2Shape::e_circle);
00044 }
00045 
00046 void b2ChainAndCircleContact::Evaluate(b2Manifold* manifold, const b2Transform& xfA, const b2Transform& xfB)
00047 {
00048         b2ChainShape* chain = (b2ChainShape*)m_fixtureA->GetShape();
00049         b2EdgeShape edge;
00050         chain->GetChildEdge(&edge, m_indexA);
00051         b2CollideEdgeAndCircle( manifold, &edge, xfA,
00052                                                         (b2CircleShape*)m_fixtureB->GetShape(), xfB);
00053 }


mvsim
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autogenerated on Thu Jun 6 2019 22:08:34