axmol/extensions/Particle3D/PU/CCPUBaseCollider.h

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 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __CC_PU_PARTICLE_3D_BASE_COLLIDER_H__
#define __CC_PU_PARTICLE_3D_BASE_COLLIDER_H__

#include "extensions/Particle3D/PU/CCPUAffector.h"
#include "3d/CCAABB.h"

NS_CC_BEGIN

struct PUParticle3D;
class CC_EX_DLL PUBaseCollider : public PUAffector
{
public:
    /** Determines how a particle collision should be determined. IT_POINT means that the position of
        the particle will be validated against the Colliders' shape. IT_BOX means that the dimensions
        (width, height and depth) are used to determine whether the particle collides.
    */
    enum IntersectionType
    {
        IT_POINT,
        IT_BOX
    };

    /** Determines how a particle behaves after collision with this collider. The behaviour of the
        particle is solved in the collider and only behaviour that needs the colliders?data is taken
        into account. The fact that a particle expires for example, can be achieved by using an
        Observer in combination with an EventHandler (DoExpireEventHandler).
        CT_NONE means that the particle doesn't do anything. This value should be set if the behaviour
        of the particle is determined outside the collider (for example, expiring the particle).
        CT_BOUNCE means that the particle bounces off the collider.
        CT_FLOW means that the particle flows around the contours of the collider.
    */
    enum CollisionType
    {
        CT_NONE,
        CT_BOUNCE,
        CT_FLOW,
    };

    // Constants
    static const float DEFAULT_BOUNCYNESS;
    static const float DEFAULT_FRICTION;
    static const IntersectionType DEFAULT_INTERSECTION_TYPE;
    static const CollisionType DEFAULT_COLLISION_TYPE;

    virtual void preUpdateAffector(float deltaTime) override;

    /** Returns the type of intersection.
     */
    IntersectionType getIntersectionType() const;

    /** Sets the type of intersection.
     */
    void setIntersectionType(const IntersectionType& intersectionType);

    /** Returns the type of collision.
     */
    CollisionType getCollisionType() const;

    /** Sets the type of collision.
     */
    void setCollisionType(const CollisionType& collisionType);

    /** Returns the friction value.
     */
    float getFriction() const;

    /** Sets the friction value.
     */
    void setFriction(const float friction);

    /** Returns the bouncyness value.
     */
    float getBouncyness() const;

    /** Sets the bouncyness value.
     */
    void setBouncyness(const float bouncyness);

    /** Fill the AxisAlignedBox with data derived from the other arguments.
     */
    void populateAlignedBox(AABB& box, const Vec3& position, const float width, const float height, const float depth);

    /** Recalculates the rotation speed after collision.
        This function must be explicitly called in the updatePUAffector(float deltaTime) function of the class that
       inherits from BaseCollider.
    */
    void calculateRotationSpeedAfterCollision(PUParticle3D* particle);

    virtual void copyAttributesTo(PUAffector* affector) override;

    CC_CONSTRUCTOR_ACCESS : PUBaseCollider();
    virtual ~PUBaseCollider();

protected:
    float _friction;    // Physics characteristic that influences particle rotation speed.
    float _bouncyness;  // Physics characteristic that influences particle velocity.
    IntersectionType _intersectionType;
    CollisionType _collisionType;
    float _velocityScale;  // Value set in the particle system, but stored in the collider for convenience.
};
NS_CC_END

#endif