axmol/cocos/physics/CCComponentPhysics2d.h

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 Copyright (c) 2015 Chukong Technologies Inc.
 
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#pragma once

#include "base/ccConfig.h" // to include defination of CC_USE_PHYSICS
#if CC_USE_PHYSICS

#include "platform/CCPlatformMacros.h"
#include "2d/CCComponent.h"

NS_CC_BEGIN

/**
 * @addtogroup physics
 * @{
 * @addtogroup physics_2d
 * @{
 */

class PhysicsBody;

class CC_DLL ComponentPhysics2d : public Component
{
public:
    /**
     * Create a physics component without physics body. Can set phyiscs body later with setPhysicsBody().
     * I am not sure if we need this function, because i think physics body is needed when creating a
     * physics component. But i think it is needed by editor, so i keep this function.
     *
     * @return A pointer of `ComponentPhysics2d` that is autoreleased.
     */
    static ComponentPhysics2d* create();
    /**
     * Create a physics component with physics body.
     *
     * @param physicsBody The physics body that belongs to this component.
     * @return A pointer of `ComponentPhysics2d` that is autoreleased.
     */
    static ComponentPhysics2d* create(PhysicsBody *physicsBody);
    
    virtual ~ComponentPhysics2d();
    
    /// @cond DO_NOT_SHOW

    /**
     * Synchronize Node's status(position, rotation, scale) to phyiscs body.
     * It is invoked before physics simulation.
     *
     * @warning Don't invoke this funciton by yourself.
     */
    void beforeSimulation();
    /**
     * Synchronize physics body's status(position, rotation) to phyiscs body.
     * It is invoked after physics simulation.
     *
     * @warning Don't invoke this funciton by yourself.
     */
    void afterSimulation();
    
    /// @endcond DO_NOT_SHOW
    
    /**
     * Set physics body of this physics component. If the physics body is set to
     * another physics component before, will set another physics component's physics
     * body to null.
     *
     * @param physicsBody The physics body belongs to this component.
     */
    void setPhysicsBody(PhysicsBody *physicsBody);
    /**
     * Get the physics body of this component.
     *
     * @return The physics body of this component.
     */
    PhysicsBody* getPhysicsBody() const;
    
    virtual void setEnabled(bool value) override;
    virtual void onEnter() override;
    virtual void onExit() override;
    virtual void onAdd() override;
    virtual void onRemove() override;
    
public:
    const static std::string COMPONENT_NAME;
    
CC_CONSTRUCTOR_ACCESS:
    ComponentPhysics2d();
    ComponentPhysics2d(PhysicsBody *phsicsBody);
    
private:
    void removePhysicsBody();
    void addToPhysicsManager();
    void removeFromPhysicsManager();
    Mat4 getParentToWorldTransform() const;
    float getPhysicsRotation(Node *node) const;
    bool isVec3Equal(const Vec3 &v1, const Vec3 &v2) const;
    
private:
    // this physic body of this component
    PhysicsBody *_physicsBody;
    // offset between owner's center point and down left point
    Vec3 _ownerCenterOffset;
    Mat4 _nodeToWorldTransform;
    // offset of owner's center point and anchor point in parent coordinate
    Vec2 _offset;
    float _physicsRotation;
    // the rotation of owner when the component is added to, the value will not change
    float _ownerOriginRotation;
    Vec3 _recordScale;
    Vec3 _scale;
};

/** @} */
/** @} */

NS_CC_END

#endif // CC_USE_PHYSICS