coco2d-x 中box2d選中剛體

普通的選中這裏就不說了,box2d中提供了，一個比較效率比較高的快速選中類，那就是b2QueryCallback

#ifndef QueryCallback_H
#define QueryCallback_H

#include <Box2D/Box2D.h>
class QueryCallback :
	public b2QueryCallback
{
public:
	QueryCallback(void);
	QueryCallback(const b2Vec2& point);
	~QueryCallback(void);
	bool ReportFixture(b2Fixture* fixture);


	b2Vec2 m_point;
	b2Fixture* m_fixture;
	std::vector<b2Fixture*> m_vectFixture;
};
#endif

#include "QueryCallback.h"


QueryCallback::QueryCallback(void)
{

}

QueryCallback::QueryCallback(const b2Vec2& point)
{
	m_point = point;
	m_fixture = NULL;
}

QueryCallback::~QueryCallback(void)
{
}

bool QueryCallback::ReportFixture(b2Fixture* fixture)
{
	b2Body* body = fixture->GetBody();
	if (body->GetType() == b2_dynamicBody)
	{
		bool inside = fixture->TestPoint(m_point);
		if (inside)
		{
			m_fixture = fixture;
			m_vectFixture.push_back(fixture);
			// We are done, terminate the query.
			return true;
		}
	}

	// Continue the query.
	return true;
}

通過這個類就可以快速的選中某個剛體回調，效率也比較高