axmol/cocos/physics/CCPhysicsShape.h

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#ifndef __CCPHYSICS_SHAPE_H__
#define __CCPHYSICS_SHAPE_H__

#include "CCPhysicsSetting.h"
#ifdef CC_USE_PHYSICS

#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 aDensity, float aRestitution, float aFriction)
    : density(aDensity)
    , restitution(aRestitution)
    , friction(aFriction)
    {}
}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(const PhysicsMaterial& material);
    
    virtual float calculateDefaultMoment() { return 0; }
    virtual float calculateDefaultArea() { return 0; }
    virtual Point getOffset() { return Point::ZERO; }
    virtual Point getCenter() { return getOffset(); }
    bool containsPoint(const Point& point) const;
    
    static Point* recenterPoints(Point* points, int count, const Point& center = Point::ZERO);
    static Point getPolyonCenter(const Point* points, int count);
    
    inline void setCategoryBitmask(int bitmask) { _categoryBitmask = bitmask; }
    inline int getCategoryBitmask() const { return _categoryBitmask; }
    inline void setContactTestBitmask(int bitmask) { _contactTestBitmask = bitmask; }
    inline int getContactTestBitmask() const { return _contactTestBitmask; }
    inline void setCollisionBitmask(int bitmask) { _collisionBitmask = bitmask; }
    inline int getCollisionBitmask() const { return _collisionBitmask; }
    
    void setGroup(int group);
    inline int getGroup() { return _group; }
    
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;
    int    _categoryBitmask;
    int    _collisionBitmask;
    int    _contactTestBitmask;
    int    _group;
    
    friend class PhysicsWorld;
    friend class PhysicsBody;
    friend class PhysicsJoint;
};

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

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

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

/** A segment shape */
class PhysicsShapeEdgeSegment : public PhysicsShape
{
public:
    static PhysicsShapeEdgeSegment* create(const Point& a, const Point& b, const PhysicsMaterial& material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1);
    
    Point getPointA() const;
    Point getPointB() const;
    virtual Point getCenter() override;
    
protected:
    bool init(const Point& a, const Point& b, const 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(const Size& size, const PhysicsMaterial& material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 0, const Point& offset = Point::ZERO);
    virtual Point getOffset() override { return _offset; }
    void getPoints(const Point* outPoints) const;
    long getPointsCount() const;
    
protected:
    bool init(const Size& size, const PhysicsMaterial& material = PHYSICSSHAPE_MATERIAL_DEFAULT, float border = 1, const Point& offset = Point::ZERO);
    
protected:
    PhysicsShapeEdgeBox();
    virtual ~PhysicsShapeEdgeBox();
    
protected:
    Point _offset;
    
    friend class PhysicsBody;
};

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

NS_CC_END

#endif // CC_USE_PHYSICS
#endif // __CCPHYSICS_FIXTURE_H__