include/cglib/point3.h

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#ifndef _POINT3_H_
#define _POINT3_H_

#include "cglib/vector3.h"

struct Point3 
{
public:
    float x;
    float y;
    float z;
    
    Point3(): x(0), y(0), z(0) 
    {
    }
    
    Point3(float c): x(c), y(c), z(c) 
    {
    }
    
    Point3(float _x, float _y, float _z) : x(_x), y(_y), z(_z) 
    {
    }

    Point3 operator+(const Vector3 &v) const 
    {
        return Point3(x + v.x, y + v.y, z + v.z);
    }
    
    Point3 &operator+=(const Vector3 &v) 
    {
        x += v.x; y += v.y; z += v.z;
        return *this;
    }

    Vector3 operator-(const Point3 &p) const 
    {
        return Vector3(x - p.x, y - p.y, z - p.z);
    }
    
    Point3 operator-(const Vector3 &v) const 
    {
        return Point3(x - v.x, y - v.y, z - v.z);
    }
    
    Point3 &operator-=(const Vector3 &v) 
    {
        x -= v.x; y -= v.y; z -= v.z;
        return *this;
    }
    
    bool operator==(const Point3 &other) const
    {
        return x == other.x && y == other.y && z == other.z;
    }

    bool operator!=(const Point3 &other) const
    {
        return x != other.x || y != other.y || z != other.z;
    }


    float operator[](int i) const 
    { 
        return (&x)[i]; 
    }
    

    float &operator[](int i) 
    { 
        return (&x)[i]; 
    }
    

    void fill_array_3(float *a)
    {
        a[0] = x;
        a[1] = y;
        a[2] = z;
    }


    void fill_array_4(float *a)
    {
        a[0] = x;
        a[1] = y;
        a[2] = z;
        a[3] = 1.0f;
    }
    

    bool is_near(const Point3 &other, float threshold=EPSILON) const
    {
        float absx = fabs(x-other.x);
        float absy = fabs(y-other.y);
        float absz = fabs(z-other.z);
        return (absx < EPSILON && absy < EPSILON && absz < EPSILON);
    }
};

inline float distance(const Point3 &p1, const Point3 &p2) 
{
    return (p1 - p2).length();
}

inline float distance_squared(const Point3 &p1, const Point3 &p2) 
{
    return (p1 - p2).length_squared();
}

#endif /* _POINT3_H_ */

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