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rude
123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*
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* Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "b2CircleContact.h"
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#include "../b2Body.h"
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#include "../b2WorldCallbacks.h"
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#include "../../Common/b2BlockAllocator.h"
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#include <new>
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#include <string.h>
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b2Contact* b2CircleContact::Create(b2Shape* shape1, b2Shape* shape2, b2BlockAllocator* allocator)
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{
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void* mem = allocator->Allocate(sizeof(b2CircleContact));
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return new (mem) b2CircleContact(shape1, shape2);
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}
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void b2CircleContact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
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{
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((b2CircleContact*)contact)->~b2CircleContact();
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allocator->Free(contact, sizeof(b2CircleContact));
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}
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b2CircleContact::b2CircleContact(b2Shape* s1, b2Shape* s2)
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: b2Contact(s1, s2)
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{
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b2Assert(m_shape1->GetType() == e_circleShape);
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b2Assert(m_shape2->GetType() == e_circleShape);
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m_manifold.pointCount = 0;
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m_manifold.points[0].normalImpulse = 0.0f;
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m_manifold.points[0].tangentImpulse = 0.0f;
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}
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void b2CircleContact::Evaluate(b2ContactListener* listener)
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{
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b2Body* b1 = m_shape1->GetBody();
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b2Body* b2 = m_shape2->GetBody();
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b2Manifold m0;
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memcpy(&m0, &m_manifold, sizeof(b2Manifold));
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b2CollideCircles(&m_manifold, (b2CircleShape*)m_shape1, b1->GetXForm(), (b2CircleShape*)m_shape2, b2->GetXForm());
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b2ContactPoint cp;
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cp.shape1 = m_shape1;
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cp.shape2 = m_shape2;
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cp.friction = m_friction;
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cp.restitution = m_restitution;
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if (m_manifold.pointCount > 0)
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{
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m_manifoldCount = 1;
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b2ManifoldPoint* mp = m_manifold.points + 0;
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if (m0.pointCount == 0)
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{
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mp->normalImpulse = 0.0f;
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mp->tangentImpulse = 0.0f;
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if (listener)
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{
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cp.position = b1->GetWorldPoint(mp->localPoint1);
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b2Vec2 v1 = b1->GetLinearVelocityFromLocalPoint(mp->localPoint1);
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b2Vec2 v2 = b2->GetLinearVelocityFromLocalPoint(mp->localPoint2);
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cp.velocity = v2 - v1;
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cp.normal = m_manifold.normal;
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cp.separation = mp->separation;
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cp.id = mp->id;
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listener->Add(&cp);
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}
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}
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else
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{
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b2ManifoldPoint* mp0 = m0.points + 0;
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mp->normalImpulse = mp0->normalImpulse;
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mp->tangentImpulse = mp0->tangentImpulse;
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if (listener)
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{
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cp.position = b1->GetWorldPoint(mp->localPoint1);
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b2Vec2 v1 = b1->GetLinearVelocityFromLocalPoint(mp->localPoint1);
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b2Vec2 v2 = b2->GetLinearVelocityFromLocalPoint(mp->localPoint2);
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cp.velocity = v2 - v1;
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cp.normal = m_manifold.normal;
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cp.separation = mp->separation;
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cp.id = mp->id;
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listener->Persist(&cp);
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}
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}
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}
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else
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{
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m_manifoldCount = 0;
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if (m0.pointCount > 0 && listener)
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{
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b2ManifoldPoint* mp0 = m0.points + 0;
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cp.position = b1->GetWorldPoint(mp0->localPoint1);
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b2Vec2 v1 = b1->GetLinearVelocityFromLocalPoint(mp0->localPoint1);
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b2Vec2 v2 = b2->GetLinearVelocityFromLocalPoint(mp0->localPoint2);
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cp.velocity = v2 - v1;
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cp.normal = m0.normal;
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cp.separation = mp0->separation;
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cp.id = mp0->id;
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listener->Remove(&cp);
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}
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}
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}
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