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POContact listener in Box2d Cocos2d
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  1. POContact listener in Box2d Cocos2d
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    copied!<p>i want to rotate a sprite and move forward after a collisions occurs with a object. The collision has to be using Box2d since i need pixel perfect collision. i have the header and implementation class for contactlistener but how do i implement it in the main class ? </p> <p>my .h file for contact listener is </p> <pre><code> #import "Box2D.h" #import &lt;vector&gt; #import &lt;algorithm&gt; struct MyContact { b2Fixture *fixtureA; b2Fixture *fixtureB; bool operator==(const MyContact&amp; other) const { return (fixtureA == other.fixtureA) &amp;&amp; (fixtureB == other.fixtureB); } }; class MyContactListener : public b2ContactListener { public: std::vector&lt;MyContact&gt;_contacts; MyContactListener(); ~MyContactListener(); 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); }; </code></pre> <p>This is my .M file for contact listener </p> <pre><code> #import "MyContactListener.h" MyContactListener::MyContactListener() : _contacts() { } MyContactListener::~MyContactListener() { } void MyContactListener::BeginContact(b2Contact* contact) { // We need to copy out the data because the b2Contact passed in // is reused. MyContact myContact = { contact-&gt;GetFixtureA(), contact-&gt;GetFixtureB() }; _contacts.push_back(myContact); } void MyContactListener::EndContact(b2Contact* contact) { MyContact myContact = { contact-&gt;GetFixtureA(), contact-&gt;GetFixtureB() }; std::vector&lt;MyContact&gt;::iterator pos; pos = std::find(_contacts.begin(), _contacts.end(), myContact); if (pos != _contacts.end()) { _contacts.erase(pos); } } void MyContactListener::PreSolve(b2Contact* contact, const b2Manifold* oldManifold) { } void MyContactListener::PostSolve(b2Contact* contact, const b2ContactImpulse* impulse) { } </code></pre> <p>In the main class i have </p> <pre><code>contactListner = new MyContactListener; world-&gt;SetContactListener(contactListner); </code></pre> <p>After this how do i check for collision in the scheduler method ?</p> <p>Thanks for the help </p>
 

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