point3.h

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/*
 This file is part of the MinGfx Project.
 
 Copyright (c) 2017,2018 Regents of the University of Minnesota.
 All Rights Reserved.
 
 Original Author(s) of this File:
    Dan Keefe, 2018, University of Minnesota
    
 Author(s) of Significant Updates/Modifications to the File:
    ...
 */
 
#ifndef SRC_POINT3_H_
#define SRC_POINT3_H_
 
#include <iostream>
#include <vector>
 
namespace mingfx {
 
#define MINGFX_MATH_EPSILON 1e-8
 
// forward declaration
class Vector3;
    
    
class Point3 {
public:  
    Point3();
 
    Point3(float x, float y, float z);
 
    Point3(float *p);
 
    Point3(const Point3& p);
 
    virtual ~Point3();
 
    bool operator==(const Point3& p) const;
 
    bool operator!=(const Point3& p) const;
 
    Point3& operator=(const Point3& p);
 
    float operator[](const int i) const;
    
    float& operator[](const int i);
    
    float x() const { return p[0]; }
    
    float y() const { return p[1]; }
    
    float z() const { return p[2]; }
    
    float w() const { return 1.0; }
    
    const float * value_ptr() const;
 
    
    Point3 Lerp(const Point3 &b, float alpha) const;
 
    float DistanceToPlane(const Point3 &plane_origin, const Vector3 &plane_normal);
 
    Point3 ClosestPointOnPlane(const Point3 &plane_origin, const Vector3 &plane_normal);
 
    Point3 ClosestPoint(const std::vector<Point3> &point_list);
    
    
    
    static const Point3& Origin();
 
    static const Point3& Zero();
    
    static const Point3& One();
    
    static Point3 Lerp(const Point3 &a, const Point3 &b, float alpha);
    
    
    
private:
    float p[3];
};
 
 
std::ostream & operator<< ( std::ostream &os, const Point3 &p);
std::istream & operator>> ( std::istream &is, Point3 &p);
 
 
} // namespace
 
#endif