Home | History | Annotate | Download | only in Contacts 
      1 /*
      2 * Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
      3 *
      4 * This software is provided 'as-is', without any express or implied
      5 * warranty.  In no event will the authors be held liable for any damages
      6 * arising from the use of this software.
      7 * Permission is granted to anyone to use this software for any purpose,
      8 * including commercial applications, and to alter it and redistribute it
      9 * freely, subject to the following restrictions:
     10 * 1. The origin of this software must not be misrepresented; you must not
     11 * claim that you wrote the original software. If you use this software
     12 * in a product, an acknowledgment in the product documentation would be
     13 * appreciated but is not required.
     14 * 2. Altered source versions must be plainly marked as such, and must not be
     15 * misrepresented as being the original software.
     16 * 3. This notice may not be removed or altered from any source distribution.
     17 */
     18 
     19 #include <Box2D/Dynamics/Contacts/b2ChainAndCircleContact.h>
     20 #include <Box2D/Common/b2BlockAllocator.h>
     21 #include <Box2D/Dynamics/b2Fixture.h>
     22 #include <Box2D/Collision/Shapes/b2ChainShape.h>
     23 #include <Box2D/Collision/Shapes/b2EdgeShape.h>
     24 
     25 #include <new>
     26 using namespace std;
     27 
     28 b2Contact* b2ChainAndCircleContact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
     29 {
     30 	void* mem = allocator->Allocate(sizeof(b2ChainAndCircleContact));
     31 	return new (mem) b2ChainAndCircleContact(fixtureA, indexA, fixtureB, indexB);
     32 }
     33 
     34 void b2ChainAndCircleContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
     35 {
     36 	((b2ChainAndCircleContact*)contact)->~b2ChainAndCircleContact();
     37 	allocator->Free(contact, sizeof(b2ChainAndCircleContact));
     38 }
     39 
     40 b2ChainAndCircleContact::b2ChainAndCircleContact(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB)
     41 : b2Contact(fixtureA, indexA, fixtureB, indexB)
     42 {
     43 	b2Assert(m_fixtureA->GetType() == b2Shape::e_chain);
     44 	b2Assert(m_fixtureB->GetType() == b2Shape::e_circle);
     45 }
     46 
     47 void b2ChainAndCircleContact::Evaluate(b2Manifold* manifold, const b2Transform& xfA, const b2Transform& xfB)
     48 {
     49 	b2ChainShape* chain = (b2ChainShape*)m_fixtureA->GetShape();
     50 	b2EdgeShape edge;
     51 	chain->GetChildEdge(&edge, m_indexA);
     52 	b2CollideEdgeAndCircle(	manifold, &edge, xfA,
     53 							(b2CircleShape*)m_fixtureB->GetShape(), xfB);
     54 }
     55