IAPDemo/Libraries/cocos2d/cocos/3d/CCAABB.h

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 Copyright (c) 2014-2017 Chukong Technologies Inc.
 
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#ifndef __CC_AABB_H__
#define __CC_AABB_H__

#include "base/ccMacros.h"
#include "math/CCMath.h"

NS_CC_BEGIN

/**
 * @addtogroup _3d
 * @{
 */

/**
 * Axis Aligned Bounding Box (AABB), usually calculate some rough but fast collision detection.
 */
class CC_DLL AABB
{

public:
    /**
     * Constructor.
     * @lua new
     */
    AABB();
    
    /**
     * Constructor.
     * @lua new
     */
    AABB(const Vec3& min, const Vec3& max);
    
    /**
     * Constructor.
     */
    AABB(const AABB& box);
    
    /**
     * Gets the center point of the bounding box.
     */
    Vec3 getCenter();

    /* Near face, specified counter-clockwise looking towards the origin from the positive z-axis.
     * verts[0] : left top front
     * verts[1] : left bottom front
     * verts[2] : right bottom front
     * verts[3] : right top front
     *
     * Far face, specified counter-clockwise looking towards the origin from the negative z-axis.
     * verts[4] : right top back
     * verts[5] : right bottom back
     * verts[6] : left bottom back
     * verts[7] : left top back
     */
    void getCorners(Vec3 *dst) const;

    /**
     * Tests whether this bounding box intersects the specified bounding object.
     */
    bool intersects(const AABB& aabb) const;

    /**
     * check whether the point is in.
     */
    bool containPoint(const Vec3& point) const;

    /**
     * Sets this bounding box to the smallest bounding box
     * that contains both this bounding object and the specified bounding box.
     */
    void merge(const AABB& box);

    /**
     * Sets this bounding box to the specified values.
     */
    void set(const Vec3& min, const Vec3& max);
    
    /**
     * Reset min and max value.If you invoke this method, isEmpty() shall return true.
     */
    void reset();
    
    /**
     * check the AABB object is empty(reset).
     */
    bool isEmpty() const;

    /**
     * update the _min and _max from the given point.
     */
    void updateMinMax(const Vec3* point, ssize_t num);
    
    /**
     * Transforms the bounding box by the given transformation matrix.
     */
    void transform(const Mat4& mat);
    
    /* --- --- --- --- Add by XuJJ start --- --- --- --- */
    void Encapsulate (const Vec3& inPoint);
//    void Encapsulate (const AABB& aabb);
    void Encapsulate (const AABB& other);

    void GetVertices( Vec3 outVertices[8] ) const;
    /* --- --- --- --- Add by XuJJ end --- --- --- --- */
    
public:
    Vec3 _min;
    Vec3 _max;
    void Init ();
    
};

/* --- --- --- --- Add by XuJJ start --- --- --- --- */
/// This version is much slower but works correctly with non-uniform scale
void TransformAABBSlow (const AABB& aabb, const Mat4& transform, AABB& result);

inline void AABB::Encapsulate (const Vec3& inPoint)
{
    _min = Min (_min, inPoint);
    _max = Max (_max, inPoint);
}

//inline void AABB::Encapsulate (const AABB& aabb)
//{
//    Encapsulate (aabb.GetCenter()+aabb.GetExtent());
//    Encapsulate (aabb.GetCenter()-aabb.GetExtent());
//}

inline void AABB::Encapsulate (const AABB& other)
{
    _min = Min (_min, other._min);
    _max = Max (_max, other._max);
}
/* --- --- --- --- Add by XuJJ end --- --- --- --- */

/* --- --- --- --- Add by QY --- --- --- --- */
inline void AABB::Init ()
{
    _min = Vec3::infinityVec;
    _max = -Vec3::infinityVec;
}

/* --- --- --- --- Add by QY --- --- --- --- */
// end of 3d group
/// @}

NS_CC_END

#endif