cocos2d-x节点（b2Island.h)API

cocos2d-x节点（b2Island.h)API

///cocos2d-x-3.0alpha0/external/Box2D/Dynamics
//添加 body,content、joints 令物体失重

#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 b2ContactVelocityConstraint;
struct b2Profile;

/// 这是一个内部的类。
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;
}
//solve 方法应用的好的话可以令物体失重
void Solve(b2Profile* profile, const b2TimeStep& step, const b2Vec2& gravity, bool allowSleep);

void SolveTOI(const b2TimeStep& subStep, int32 toiIndexA, int32 toiIndexB);

void Add(b2Body* body)
{
b2Assert(m_bodyCount < m_bodyCapacity);
body->m_islandIndex = m_bodyCount;
m_bodies[m_bodyCount] = body;
++m_bodyCount;
}

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 b2ContactVelocityConstraint* 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