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
27b2Contact* b2ChainAndCircleContact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
28{
29 void* mem = allocator->Allocate(sizeof(b2ChainAndCircleContact));
30 return new (mem) b2ChainAndCircleContact(fixtureA, indexA, fixtureB, indexB);
31}
32
33void b2ChainAndCircleContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
34{
35 ((b2ChainAndCircleContact*)contact)->~b2ChainAndCircleContact();
36 allocator->Free(contact, sizeof(b2ChainAndCircleContact));
37}
38
39b2ChainAndCircleContact::b2ChainAndCircleContact(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB)
40: b2Contact(fixtureA, indexA, fixtureB, indexB)
41{
42 b2Assert(m_fixtureA->GetType() == b2Shape::e_chain);
43 b2Assert(m_fixtureB->GetType() == b2Shape::e_circle);
44}
45
46void b2ChainAndCircleContact::Evaluate(b2Manifold* manifold, const b2Transform& xfA, const b2Transform& xfB)
47{
48 b2ChainShape* chain = (b2ChainShape*)m_fixtureA->GetShape();
49 b2EdgeShape edge;
50 chain->GetChildEdge(&edge, m_indexA);
51 b2CollideEdgeAndCircle( manifold, &edge, xfA,
52 (b2CircleShape*)m_fixtureB->GetShape(), xfB);
53}
54