b2_chain_circle_contact.cpp

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// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include "b2_chain_circle_contact.h"
#include "box2d/b2_block_allocator.h"
#include "box2d/b2_fixture.h"
#include "box2d/b2_chain_shape.h"
#include "box2d/b2_edge_shape.h"

#include <new>

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);
}