RedCore/cocos2d/extensions/Particle3D/PU/CCPUSphere.h

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#ifndef __CC_PU_PARTICLE_3D_SPHERE_H__
#define __CC_PU_PARTICLE_3D_SPHERE_H__

#include "base/CCRef.h"
#include "math/CCMath.h"
#include "3d/CCAABB.h"
#include <vector>

NS_CC_BEGIN
/** A sphere primitive, mostly used for bounds checking. 
@remarks
    A sphere in math texts is normally represented by the function
    x^2 + y^2 + z^2 = r^2 (for sphere's centered on the origin). Ogre stores spheres
    simply as a center point and a radius.
*/
class PUSphere
{
protected:
    float _radius;
    Vec3 _center;
public:
    /** Standard constructor - creates a unit sphere around the origin.*/
    PUSphere();
    /** Constructor allowing arbitrary spheres. 
        @param center The center point of the sphere.
        @param radius The radius of the sphere.
    */
    PUSphere(const Vec3& center, float radius);

    /** Returns the radius of the sphere. */
    float getRadius(void) const { return _radius; }

    /** Sets the radius of the sphere. */
    void setRadius(float radius) { _radius = radius; }

    /** Returns the center point of the sphere. */
    const Vec3& getCenter(void) const { return _center; }

    /** Sets the center point of the sphere. */
    void setCenter(const Vec3& center) { _center = center; }

    /** Returns whether or not this sphere intersects another sphere. */
    bool intersects(const PUSphere& s) const
    {
        return (s._center - _center).lengthSquared() <= (s._radius + _radius) * (s._radius + _radius);
    }
    ///** Returns whether or not this sphere intersects a box. */
    //bool intersects(const AABB& box) const
    //{
    //	return Math::intersects(*this, box);
    //}
    /** Returns whether or not this sphere intersects a plane. */
    //bool intersects(const Plane& plane) const
    //{
    //	return Math::intersects(*this, plane);
    //}
    /** Returns whether or not this sphere intersects a point. */
    bool intersects(const Vec3& v) const
    {
        return ((v - _center).lengthSquared() <= _radius * _radius);
    }
    /** Merges another Sphere into the current sphere */
    void merge(const PUSphere& oth);
        

};
NS_CC_END

#endif