RedCore/cocos2d/cocos/3d/CCPlane.h

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#ifndef __CC_PLANE_H_
#define __CC_PLANE_H_

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

NS_CC_BEGIN

enum class PointSide
{
    IN_PLANE,
    FRONT_PLANE,
    BEHIND_PLANE,
};

/**
 * Defines plane
 * @js NA
 * @lua NA
 **/
class CC_DLL Plane
{
public:
    /**
    * create plane from tree point.
    */
    Plane(const Vec3& p1, const Vec3& p2, const Vec3& p3);

    /**
    * create plane from normal and dist.
    */
    Plane(const Vec3& normal, float dist);

    /**
    * create plane from normal and a point on plane.
    */
    Plane(const Vec3& normal, const Vec3& point);
    
    /**
     * create a default plan whose normal is (0, 0, 1), and _dist is 0, xoy plan in fact.
     */
    Plane();
    
    /**
    * init plane from tree point.
    */
    void initPlane(const Vec3& p1, const Vec3& p2, const Vec3& p3);

    /**
    * init plane from normal and dist.
    */
    void initPlane(const Vec3& normal, float dist);

    /**
    * init plane from normal and a point on plane.
    */
    void initPlane(const Vec3& normal, const Vec3& point);

    /**
    * dist to plane, > 0 normal direction
    */
    float dist2Plane(const Vec3& p) const;

    /**
    * Gets the plane's normal.
    */
    const Vec3& getNormal() const { return _normal; }

    /**
    * Gets the plane's distance to the origin along its normal.
    */
    float getDist() const  { return _dist; }

    /**
    * Return the side where the point is.
    */
    PointSide getSide(const Vec3& point) const;

protected:
    Vec3 _normal; // the normal line of the plane
    float _dist; // original displacement of the normal
};

NS_CC_END

#endif