axmol/cocos/physics/CCPhysicsShape.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#include "CCPhysicsSetting.h"
#ifdef CC_USE_PHYSICS

#ifndef __CCPHYSICS_SHAPE_H__
#define __CCPHYSICS_SHAPE_H__

#include "CCObject.h"
#include "CCGeometry.h"

NS_CC_BEGIN

class PhysicsShapeInfo;
class PhysicsBody;
class PhysicsBodyInfo;


typedef struct PhysicsMaterial
{
    float density;
    float restitution;
    float friction;
    
    PhysicsMaterial()
    : density(0.0f)
    , restitution(0.0f)
    , friction(0.0f)
    {}
    
    PhysicsMaterial(float density, float restitution, float friction)
    : density(density)
    , restitution(restitution)
    , friction(friction)
    {}
}PhysicsMaterial;

const PhysicsMaterial PHYSICSSHAPE_MATERIAL_DEFAULT(0.0f, 0.5f, 0.5f);

/**
 * @brief A shape for body. You do not create PhysicsWorld objects directly, instead, you can view PhysicsBody to see how to create it.
 */
class PhysicsShape : public Object
{
public:
    enum class Type
    {
        UNKNOWN,
        CIRCLE,
        BOX,
        POLYGEN,
        EDGESEGMENT,
        EDGEBOX,
        EDGEPOLYGEN,
        EDGECHAIN,
    };
    
public:
    inline PhysicsBody* getBody() const { return _body; }
    inline Type getType() const { return _type; }
    inline float getArea() const { return _area; }
    inline float getMoment() const { return _moment; }
    void setMoment(float moment);
    inline void setTag(int tag) { _tag = tag; }
    inline int getTag() const { return _tag; }
    
    inline float getMass() const { return _mass; }
    void setMass(float mass);
    inline float getDensity() const { return _material.density; }
    void setDensity(float density);
    void setRestitution(float restitution);
    void setFriction(float friction);
    void setMaterial(PhysicsMaterial material);
    
    virtual float calculateDefaultMoment() { return 0; }
    virtual float calculateDefaultArea() { return 0; }
    virtual Point getOffset() { return Point::ZERO; }
    virtual Point getCenter() { return getOffset(); }
    
    static Point* recenterPoints(Point* points, int count, Point center = Point::ZERO);
    static Point getPolyonCenter(Point* points, int count);
    
protected:
    bool init(Type type);
    
    /**
     * @brief PhysicsShape is PhysicsBody's friend class, but all the subclasses isn't. so this method is use for subclasses to catch the bodyInfo from PhysicsBody.
     */
    PhysicsBodyInfo* bodyInfo() const;
    
    void setBody(PhysicsBody* body);
    
protected:
    PhysicsShape();
    virtual ~PhysicsShape() = 0;
    
protected:
    PhysicsBody* _body;
    PhysicsShapeInfo* _info;
    Type _type;
    float _area;
    float _mass;
    float _moment;
    PhysicsMaterial _material;
    int _tag;
    
    friend class PhysicsWorld;
    friend class PhysicsBody;
    friend class PhysicsJoint;
};

/** A circle shape */
class PhysicsShapeCircle : public PhysicsShape
{
public:
    static PhysicsShapeCircle* create(float radius, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    static float calculateArea(float radius);
    static float calculateMoment(float mass, float radius, Point offset = Point(0, 0));
    
    float calculateDefaultArea() override;
    float calculateDefaultMoment() override;
    
    float getRadius();
    Point getOffset();
protected:
    bool init(float radius, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    
protected:
    PhysicsShapeCircle();
    ~PhysicsShapeCircle();
};

/** A box shape */
class PhysicsShapeBox : public PhysicsShape
{
public:
    static PhysicsShapeBox* create(Size size, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    static float calculateArea(Size size);
    static float calculateMoment(float mass, Size size, Point offset = Point(0, 0));
    
    float calculateDefaultArea() override;
    float calculateDefaultMoment() override;
    
    Point* getPoints(Point* points);
    Size getSize();
    Point getOffset() override { return _offset; }
    
protected:
    bool init(Size size, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    
protected:
    PhysicsShapeBox();
    virtual ~PhysicsShapeBox();
    
protected:
    Point _offset;
};

/** A polygon shape */
class PhysicsShapePolygon : public PhysicsShape
{
public:
    static PhysicsShapePolygon* create(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    static float calculateArea(Point* points, int count);
    static float calculateMoment(float mass, Point* points, int count, Point offset = Point(0, 0));
    
    float calculateDefaultArea() override;
    float calculateDefaultMoment() override;
    
    Point* getPoints(Point* points);
    int getPointsCount();
    Point getCenter() override;
protected:
    bool init(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, Point offset = Point(0, 0));
    
protected:
    PhysicsShapePolygon();
    virtual ~PhysicsShapePolygon();
    
protected:
    Point _center;
};

/** A segment shape */
class PhysicsShapeEdgeSegment : public PhysicsShape
{
public:
    static PhysicsShapeEdgeSegment* create(Point a, Point b, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    
    Point getPointA();
    Point getPointB();
    Point getCenter() override;
    
protected:
    bool init(Point a, Point b, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    
protected:
    PhysicsShapeEdgeSegment();
    virtual ~PhysicsShapeEdgeSegment();
    
protected:
    Point _center;
    
    friend class PhysicsBody;
};

/** An edge box shape */
class PhysicsShapeEdgeBox : public PhysicsShape
{
public:
    static PhysicsShapeEdgeBox* create(Size size, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 0, Point offset = Point(0, 0));
    Point getOffset() override { return _offset; }
    Point* getPoints(Point* points);
    int getPointsCount();
    
protected:
    bool init(Size size, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1, Point offset = Point(0, 0));
    
protected:
    PhysicsShapeEdgeBox();
    virtual ~PhysicsShapeEdgeBox();
    
protected:
    Point _offset;
    
    friend class PhysicsBody;
};

/** An edge polygon shape */
class PhysicsShapeEdgePolygon : public PhysicsShape
{
public:
    static PhysicsShapeEdgePolygon* create(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    Point getCenter() override;
    Point* getPoints(Point* points);
    int getPointsCount();
    
protected:
    bool init(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    
protected:
    PhysicsShapeEdgePolygon();
    virtual ~PhysicsShapeEdgePolygon();
    
    friend class PhysicsBody;
    
protected:
    Point _center;
};

/** a chain shape */
class PhysicsShapeEdgeChain : public PhysicsShape
{
public:
    static PhysicsShapeEdgeChain* create(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    Point getCenter() override;
    Point* getPoints(Point* points);
    int getPointsCount();
    
protected:
    bool init(Point* points, int count, PhysicsMaterial material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    
protected:
    PhysicsShapeEdgeChain();
    virtual ~PhysicsShapeEdgeChain();
    
protected:
    Point _center;
    
    friend class PhysicsBody;
};

NS_CC_END
#endif // __CCPHYSICS_FIXTURE_H__

#endif // CC_USE_PHYSICS