File indexing completed on 2025-08-03 03:50:01

 /*
 * 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;
     qreal a;
 };
 
 /// This is an internal structure.
 struct b2Velocity
 {
     b2Vec2 v;
     qreal 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 SolveTOI(const b2TimeStep& subStep, const b2Body* bodyA, const b2Body* bodyB);
 
     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;
 };
 
 #endif