b2Island.h
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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.
- */
- #ifndef B2_ISLAND_H
- #define B2_ISLAND_H
- #include <Box2D/Common/b2Math.h>
- #include <Box2D/Dynamics/b2Body.h>
- #include <Box2D/Dynamics/b2TimeStep.h>
- class b2Contact;
- class b2Joint;
- class b2StackAllocator;
- class b2ContactListener;
- struct b2ContactConstraint;
- /// This is an internal structure.
- struct b2Position
- {
- b2Vec2 x;
- float32 a;
- };
- /// This is an internal structure.
- struct b2Velocity
- {
- b2Vec2 v;
- float32 w;
- };
- /// This is an internal class.
- class b2Island
- {
- public:
- b2Island(int32 bodyCapacity, int32 contactCapacity, int32 jointCapacity,
- b2StackAllocator* allocator, b2ContactListener* listener);
- ~b2Island();
- void Clear()
- {
- m_bodyCount = 0;
- m_contactCount = 0;
- m_jointCount = 0;
- }
- void Solve(const b2TimeStep& step, const b2Vec2& gravity, bool allowSleep);
- void Add(b2Body* body)
- {
- b2Assert(m_bodyCount < m_bodyCapacity);
- body->m_islandIndex = m_bodyCount;
- m_bodies[m_bodyCount++] = body;
- }
- void Add(b2Contact* contact)
- {
- b2Assert(m_contactCount < m_contactCapacity);
- m_contacts[m_contactCount++] = contact;
- }
- void Add(b2Joint* joint)
- {
- b2Assert(m_jointCount < m_jointCapacity);
- m_joints[m_jointCount++] = joint;
- }
- void Report(const b2ContactConstraint* constraints);
- b2StackAllocator* m_allocator;
- b2ContactListener* m_listener;
- b2Body** m_bodies;
- b2Contact** m_contacts;
- b2Joint** m_joints;
- b2Position* m_positions;
- b2Velocity* m_velocities;
- int32 m_bodyCount;
- int32 m_jointCount;
- int32 m_contactCount;
- int32 m_bodyCapacity;
- int32 m_contactCapacity;
- int32 m_jointCapacity;
- int32 m_positionIterationCount;
- };
- #endif