text: /*
  * Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
  *
  * This software is provided 'as-is', without any express or implied
  * warranty.  In no event will the authors be held liable for any damages
  * arising from the use of this software.
  * Permission is granted to anyone to use this software for any purpose,
  * including commercial applications, and to alter it and redistribute it
  * freely, subject to the following restrictions:
  * 1. The origin of this software must not be misrepresented; you must not
  * claim that you wrote the original software. If you use this software
  * in a product, an acknowledgment in the product documentation would be
  * appreciated but is not required.
  * 2. Altered source versions must be plainly marked as such, and must not be
  * misrepresented as being the original software.
  * 3. This notice may not be removed or altered from any source distribution.
  */
  
  #import "b2ChainAndCircleContact.h"
  #import "b2BlockAllocator.h"
  #import "b2Fixture.h"
  #import "b2ChainShape.h"
  #import "b2EdgeShape.h"
  
  #import <new>
  using namespace std;
  
  b2Contact* b2ChainAndCircleContact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
  {
  	void* mem = allocator->Allocate(sizeof(b2ChainAndCircleContact));
  	return new (mem) b2ChainAndCircleContact(fixtureA, indexA, fixtureB, indexB);
  }
  
  void b2ChainAndCircleContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
  {
  	((b2ChainAndCircleContact*)contact)->~b2ChainAndCircleContact();
  	allocator->Free(contact, sizeof(b2ChainAndCircleContact));
  }
  
  b2ChainAndCircleContact::b2ChainAndCircleContact(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB)
  : b2Contact(fixtureA, indexA, fixtureB, indexB)
  {
  	b2Assert(m_fixtureA->GetType() == b2Shape::e_chain);
  	b2Assert(m_fixtureB->GetType() == b2Shape::e_circle);
  }
  
  void b2ChainAndCircleContact::Evaluate(b2Manifold* manifold, const b2Transform& xfA, const b2Transform& xfB)
  {
  	b2ChainShape* chain = (b2ChainShape*)m_fixtureA->GetShape();
  	b2EdgeShape edge;
  	chain->GetChildEdge(&edge, m_indexA);
  	b2CollideEdgeAndCircle(	manifold, &edge, xfA,
  							(b2CircleShape*)m_fixtureB->GetShape(), xfB);
  }
  