axmol/cocos/physics/CCPhysicsWorld.h

/****************************************************************************
 Copyright (c) 2013 Chukong Technologies Inc.
 
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#ifndef __CCPHYSICS_WORLD_H__
#define __CCPHYSICS_WORLD_H__

#include "base/ccConfig.h"
#if CC_USE_PHYSICS

#include "base/CCVector.h"
#include "base/CCRef.h"
#include "math/CCGeometry.h"
#include "physics/CCPhysicsBody.h"
#include <list>

NS_CC_BEGIN

class PhysicsBody;
class PhysicsJoint;
class PhysicsWorldInfo;
class PhysicsShape;
class PhysicsContact;

typedef Vec2 Vect;

class Node;
class Sprite;
class Scene;
class DrawNode;
class PhysicsDebugDraw;

class PhysicsWorld;

typedef struct PhysicsRayCastInfo
{
    PhysicsShape* shape;
    Vec2 start;
    Vec2 end;              //< in lua, it's name is "ended"
    Vec2 contact;
    Vect normal;
    float fraction;
    void* data;
}PhysicsRayCastInfo;

/**
 * @brief Called for each fixture found in the query. You control how the ray cast
 * proceeds by returning a float:
 * return true: continue
 * return false: terminate the ray cast
 * @param fixture the fixture hit by the ray
 * @param point the point of initial intersection
 * @param normal the normal vector at the point of intersection
 * @return true to continue, false to terminate
 */
typedef std::function<bool(PhysicsWorld& world, const PhysicsRayCastInfo& info, void* data)> PhysicsRayCastCallbackFunc;
typedef std::function<bool(PhysicsWorld&, PhysicsShape&, void*)> PhysicsQueryRectCallbackFunc;
typedef PhysicsQueryRectCallbackFunc PhysicsQueryPointCallbackFunc;

/**
 * @brief An PhysicsWorld object simulates collisions and other physical properties. You do not create PhysicsWorld objects directly; instead, you can get it from an Scene object.
 */
class CC_DLL PhysicsWorld
{
public:
    static const int DEBUGDRAW_NONE;        ///< draw nothing
    static const int DEBUGDRAW_SHAPE;       ///< draw shapes
    static const int DEBUGDRAW_JOINT;       ///< draw joints
    static const int DEBUGDRAW_CONTACT;     ///< draw contact
    static const int DEBUGDRAW_ALL;         ///< draw all
    
public:
    /** Adds a joint to the physics world.*/
    virtual void addJoint(PhysicsJoint* joint);
    /** Remove a joint from physics world.*/
    virtual void removeJoint(PhysicsJoint* joint, bool destroy = true);
    /** Remove all joints from physics world.*/
    virtual void removeAllJoints(bool destroy = true);
    
    /** Remove a body from physics world. */
    virtual void removeBody(PhysicsBody* body);
    /** Remove body by tag. */
    virtual void removeBody(int tag);
    /** Remove all bodies from physics world. */
    virtual void removeAllBodies();
    
    /** Searches for physics shapes that intersects the ray. */
    void rayCast(PhysicsRayCastCallbackFunc func, const Vec2& start, const Vec2& end, void* data);
    /** Searches for physics shapes that contains in the rect. */
    void queryRect(PhysicsQueryRectCallbackFunc func, const Rect& rect, void* data);
    /** Searches for physics shapes that contains the point. */
    void queryPoint(PhysicsQueryPointCallbackFunc func, const Vec2& point, void* data);
    /** Get phsyics shapes that contains the point. */
    Vector<PhysicsShape*> getShapes(const Vec2& point) const;
    /** return physics shape that contains the point. */
    PhysicsShape* getShape(const Vec2& point) const;
    /** Get all the bodys that in the physics world. */
    const Vector<PhysicsBody*>& getAllBodies() const;
    /** Get body by tag */
    PhysicsBody* getBody(int tag) const;
    
    /** Get scene contain this physics world */
    inline Scene& getScene() const { return *_scene; }
    /** get the gravity value */
    inline Vect getGravity() const { return _gravity; }
    /** set the gravity value */
    void setGravity(const Vect& gravity);
    /**
     * Set the speed of physics world, speed is the rate at which the simulation executes. default value is 1.0
     * Note: if you setAutoStep(false), this won't work.
     */
    inline void setSpeed(float speed) { if(speed >= 0.0f) { _speed = speed; } }
    /** get the speed of physics world */
    inline float getSpeed() { return _speed; }
    /**
     * set the update rate of physics world, update rate is the value of EngineUpdateTimes/PhysicsWorldUpdateTimes.
     * set it higher can improve performance, set it lower can improve accuracy of physics world simulation.
     * default value is 1.0
     * Note: if you setAutoStep(false), this won't work.
     */
    inline void setUpdateRate(int rate) { if(rate > 0) { _updateRate = rate; } }
    /** get the update rate */
    inline int getUpdateRate() { return _updateRate; }
    /**
     * set the number of substeps in an update of the physics world.
     * One physics update will be divided into several substeps to increase its accuracy.
     * default value is 1
     */
    void setSubsteps(int steps);
    /** get the number of substeps */
    inline int getSubsteps() const { return _substeps; }

    /** set the debug draw mask */
    void setDebugDrawMask(int mask);
    /** get the bebug draw mask */
    inline int getDebugDrawMask() { return _debugDrawMask; }
    
    /**
     * To control the step of physics, if you want control it by yourself( fixed-timestep for example ), you can set this to false and call step by yourself.
     * Defaut value is true.
     * Note: if you set auto step to false, setSpeed setSubsteps and setUpdateRate won't work, you need to control the time step by yourself.
     */
    void setAutoStep(bool autoStep){ _autoStep = autoStep; }
    /** Get the auto step */
    bool isAutoStep() { return _autoStep; }
    /**
     * The step for physics world, The times passing for simulate the physics.
     * Note: you need to setAutoStep(false) first before it can work.
     */
    void step(float delta);
    
protected:
    static PhysicsWorld* construct(Scene& scene);
    bool init(Scene& scene);
    
    virtual void addBody(PhysicsBody* body);
    virtual void addShape(PhysicsShape* shape);
    virtual void removeShape(PhysicsShape* shape);
    virtual void update(float delta, bool userCall = false);
    
    virtual void debugDraw();
    
    virtual int collisionBeginCallback(PhysicsContact& contact);
    virtual int collisionPreSolveCallback(PhysicsContact& contact);
    virtual void collisionPostSolveCallback(PhysicsContact& contact);
    virtual void collisionSeparateCallback(PhysicsContact& contact);
    
    virtual void doAddBody(PhysicsBody* body);
    virtual void doRemoveBody(PhysicsBody* body);
    virtual void doAddJoint(PhysicsJoint* joint);
    virtual void doRemoveJoint(PhysicsJoint* joint);
    virtual void addBodyOrDelay(PhysicsBody* body);
    virtual void removeBodyOrDelay(PhysicsBody* body);
    virtual void addJointOrDelay(PhysicsJoint* joint);
    virtual void removeJointOrDelay(PhysicsJoint* joint);
    virtual void updateBodies();
    virtual void updateJoints();
    
protected:
    Vect _gravity;
    float _speed;
    int _updateRate;
    int _updateRateCount;
    float _updateTime;
    int _substeps;
    PhysicsWorldInfo* _info;
    
    Vector<PhysicsBody*> _bodies;
    std::list<PhysicsJoint*> _joints;
    Scene* _scene;
    
    bool _delayDirty;
    bool _autoStep;
    PhysicsDebugDraw* _debugDraw;
    int _debugDrawMask;
    
    
    Vector<PhysicsBody*> _delayAddBodies;
    Vector<PhysicsBody*> _delayRemoveBodies;
    std::vector<PhysicsJoint*> _delayAddJoints;
    std::vector<PhysicsJoint*> _delayRemoveJoints;
    
protected:
    PhysicsWorld();
    virtual ~PhysicsWorld();
    
    friend class Node;
    friend class Sprite;
    friend class Scene;
    friend class PhysicsBody;
    friend class PhysicsShape;
    friend class PhysicsJoint;
    friend class PhysicsWorldCallback;
    friend class PhysicsDebugDraw;
};


class CC_DLL PhysicsDebugDraw
{
protected:
    virtual bool begin();
    virtual void end();
    virtual void drawShape(PhysicsShape& shape);
    virtual void drawJoint(PhysicsJoint& joint);
    virtual void drawContact();
    
protected:
    PhysicsDebugDraw(PhysicsWorld& world);
    virtual ~PhysicsDebugDraw();
    
protected:
    DrawNode* _drawNode;
    PhysicsWorld& _world;
    
    friend class PhysicsWorld;
};
extern const float CC_DLL PHYSICS_INFINITY;

NS_CC_END

#endif // CC_USE_PHYSICS
#endif // __CCPHYSICS_WORLD_H__