b2Fixture.cpp
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上传日期:2022-01-07
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- /*
- * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
- #include <Box2D/Dynamics/b2Fixture.h>
- #include <Box2D/Dynamics/Contacts/b2Contact.h>
- #include <Box2D/Collision/Shapes/b2CircleShape.h>
- #include <Box2D/Collision/Shapes/b2PolygonShape.h>
- #include <Box2D/Collision/b2BroadPhase.h>
- #include <Box2D/Collision/b2Collision.h>
- #include <Box2D/Common/b2BlockAllocator.h>
- b2Fixture::b2Fixture()
- {
- m_userData = NULL;
- m_body = NULL;
- m_next = NULL;
- m_proxyId = b2BroadPhase::e_nullProxy;
- m_shape = NULL;
- m_density = 0.0f;
- }
- b2Fixture::~b2Fixture()
- {
- b2Assert(m_shape == NULL);
- b2Assert(m_proxyId == b2BroadPhase::e_nullProxy);
- }
- void b2Fixture::Create(b2BlockAllocator* allocator, b2Body* body, const b2FixtureDef* def)
- {
- m_userData = def->userData;
- m_friction = def->friction;
- m_restitution = def->restitution;
- m_body = body;
- m_next = NULL;
- m_filter = def->filter;
- m_isSensor = def->isSensor;
- m_shape = def->shape->Clone(allocator);
- m_density = def->density;
- }
- void b2Fixture::Destroy(b2BlockAllocator* allocator)
- {
- // The proxy must be destroyed before calling this.
- b2Assert(m_proxyId == b2BroadPhase::e_nullProxy);
- // Free the child shape.
- switch (m_shape->m_type)
- {
- case b2Shape::e_circle:
- {
- b2CircleShape* s = (b2CircleShape*)m_shape;
- s->~b2CircleShape();
- allocator->Free(s, sizeof(b2CircleShape));
- }
- break;
- case b2Shape::e_polygon:
- {
- b2PolygonShape* s = (b2PolygonShape*)m_shape;
- s->~b2PolygonShape();
- allocator->Free(s, sizeof(b2PolygonShape));
- }
- break;
- default:
- b2Assert(false);
- break;
- }
- m_shape = NULL;
- }
- void b2Fixture::CreateProxy(b2BroadPhase* broadPhase, const b2Transform& xf)
- {
- b2Assert(m_proxyId == b2BroadPhase::e_nullProxy);
- // Create proxy in the broad-phase.
- m_shape->ComputeAABB(&m_aabb, xf);
- m_proxyId = broadPhase->CreateProxy(m_aabb, this);
- }
- void b2Fixture::DestroyProxy(b2BroadPhase* broadPhase)
- {
- if (m_proxyId == b2BroadPhase::e_nullProxy)
- {
- return;
- }
- // Destroy proxy in the broad-phase.
- broadPhase->DestroyProxy(m_proxyId);
- m_proxyId = b2BroadPhase::e_nullProxy;
- }
- void b2Fixture::Synchronize(b2BroadPhase* broadPhase, const b2Transform& transform1, const b2Transform& transform2)
- {
- if (m_proxyId == b2BroadPhase::e_nullProxy)
- {
- return;
- }
- // Compute an AABB that covers the swept shape (may miss some rotation effect).
- b2AABB aabb1, aabb2;
- m_shape->ComputeAABB(&aabb1, transform1);
- m_shape->ComputeAABB(&aabb2, transform2);
-
- m_aabb.Combine(aabb1, aabb2);
- b2Vec2 displacement = transform2.position - transform1.position;
- broadPhase->MoveProxy(m_proxyId, m_aabb, displacement);
- }
- void b2Fixture::SetFilterData(const b2Filter& filter)
- {
- m_filter = filter;
- if (m_body == NULL)
- {
- return;
- }
- // Flag associated contacts for filtering.
- b2ContactEdge* edge = m_body->GetContactList();
- while (edge)
- {
- b2Contact* contact = edge->contact;
- b2Fixture* fixtureA = contact->GetFixtureA();
- b2Fixture* fixtureB = contact->GetFixtureB();
- if (fixtureA == this || fixtureB == this)
- {
- contact->FlagForFiltering();
- }
- edge = edge->next;
- }
- }
- void b2Fixture::SetSensor(bool sensor)
- {
- m_isSensor = sensor;
- }