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 "b2ChainAndPolygonContact.h"
20 #include "../../Common/b2BlockAllocator.h"
21 #include "../b2Fixture.h"
22 #include "../../Collision/Shapes/b2ChainShape.h"
23 #include "../../Collision/Shapes/b2EdgeShape.h"
24
25 #include <new>
26 using namespace std;
27
Create(b2Fixture * fixtureA,int32 indexA,b2Fixture * fixtureB,int32 indexB,b2BlockAllocator * allocator)28 b2Contact* b2ChainAndPolygonContact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
29 {
30 void* mem = allocator->Allocate(sizeof(b2ChainAndPolygonContact));
31 return new (mem) b2ChainAndPolygonContact(fixtureA, indexA, fixtureB, indexB);
32 }
33
Destroy(b2Contact * contact,b2BlockAllocator * allocator)34 void b2ChainAndPolygonContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
35 {
36 ((b2ChainAndPolygonContact*)contact)->~b2ChainAndPolygonContact();
37 allocator->Free(contact, sizeof(b2ChainAndPolygonContact));
38 }
39
b2ChainAndPolygonContact(b2Fixture * fixtureA,int32 indexA,b2Fixture * fixtureB,int32 indexB)40 b2ChainAndPolygonContact::b2ChainAndPolygonContact(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_polygon);
45 }
46
Evaluate(b2Manifold * manifold,const b2Transform & xfA,const b2Transform & xfB)47 void b2ChainAndPolygonContact::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 b2CollideEdgeAndPolygon( manifold, &edge, xfA,
53 (b2PolygonShape*)m_fixtureB->GetShape(), xfB);
54 }
55