box2d 碰撞监听

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要监听碰撞，就应该用到box2d b2ContactListener类

其他废话不说了，直接上代码：

#ifndef ContactListener_H#define ContactListener_H#include "Box2D/Box2D.h"class Contact{public:b2Fixture *fixtureA;b2Fixture *fixtureB;};class IContactListener{public:virtual void updateContact() = 0;};class ContactListener :public b2ContactListener{public:ContactListener(void);~ContactListener(void);virtual void BeginContact(b2Contact *contact);virtual void EndContact(b2Contact *contact);virtual void PreSolve(b2Contact *contact, const b2Manifold *oldManifold);virtual void PostSolve(b2Contact *contact, const b2ContactImpulse *impulse);void addListener(IContactListener* pContactListener);public:std::list<Contact> contact_list;};#endif

#include "ContactListener.h"ContactListener::ContactListener(void){}ContactListener::~ContactListener(void){}//! Callbacks for derived classes.void ContactListener::BeginContact(b2Contact *contact){if (contact){Contact c; c.fixtureA = contact->GetFixtureA(); c.fixtureB = contact->GetFixtureB();contact_list.push_back(c);}else{CCLOG("error!");}B2_NOT_USED(contact);}void ContactListener::EndContact(b2Contact *contact){Contact myContact = { contact->GetFixtureA(), contact->GetFixtureB() };  std::list<Contact>::iterator posBegin =  contact_list.begin();std::list<Contact>::iterator posEnd =  contact_list.end();for (; posBegin != posEnd; posBegin++){if(posBegin->fixtureA == contact->GetFixtureA() && posBegin->fixtureB == contact->GetFixtureB()){contact_list.erase(posBegin);break;}}B2_NOT_USED(contact);}void ContactListener::PreSolve(b2Contact *contact, const b2Manifold *oldManifold){B2_NOT_USED(contact);B2_NOT_USED(oldManifold);}void ContactListener::PostSolve(b2Contact *contact, const b2ContactImpulse *impulse){B2_NOT_USED(contact);B2_NOT_USED(impulse);}

在word初始化的时候，调用

m_plistener = new ContactListener();m_pworld->SetContactListener(m_plistener);

这样box2d监听就完成了

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