187 lines
3.2 KiB
C++
187 lines
3.2 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comté
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* (Université de Franche-Comté), France.
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*/
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#include "point3d.hh"
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#include "posutil.hh"
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#include "posexcept.hh"
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#include <sstream>
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#include <boost/functional/hash.hpp>
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using namespace std ;
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/* *** Constructors *** */
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Point3D::Point3D(const string &source)
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{
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float pos[3] ;
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istringstream iss(source) ;
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for (int i = 0 ; i < 2 ; ++i)
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{
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iss >> pos[i] ;
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if (iss.get() != ';')
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throw malformed_input_data(
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"Point3D(string): cannot extract coordinates!") ;
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}
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iss >> pos[2] ;
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set_coordinates(pos) ;
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}
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/* *** Distance operations *** */
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/**
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* The distance is not square rooted after the computation, in order
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* to optimise comparisons.
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*/
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float Point3D::square_distance(const Point3D &source) const
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{
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return
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(x - source.x) * (x - source.x) +
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(y - source.y) * (y - source.y) +
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(z - source.z) * (z - source.z) ;
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}
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/**
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* The distance is not square rooted after the computation, in order
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* to optimise comparisons.
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*/
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float Point3D::square_distance(const float _x,
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const float _y,
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const float _z) const
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{
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return
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(x - _x) * (x - _x) +
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(y - _y) * (y - _y) +
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(z - _z) * (z - _z) ;
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}
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/**
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* A, B and C are three points, A being the current Point3D (*this).
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* If the points are aligned, the angle returned is always 0° (and not
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* 180°, even in the case where A is on BC).
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* @returns The angle BÂC, in the interval [0, 180] degrees.
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*/
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double Point3D::angle(const Point3D &b, const Point3D &c) const
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{
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double
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sq_ab = square_distance(b),
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sq_ac = square_distance(c),
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sq_bc = b.square_distance(c) ;
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if (sq_ab == 0 || sq_ac == 0 || sq_bc == 0)
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return 0 ;
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double
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ab = sqrt(sq_ab),
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ac = sqrt(sq_ac) ;
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double cos_bac = (sq_ab + sq_ac - sq_bc) / (2 * ab * ac) ;
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double bac = acos(cos_bac) ;
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return PosUtil::rad2deg(bac) ;
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}
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/* *** Operators *** */
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Point3D& Point3D::operator=(const Point3D &source)
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{
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if (this == &source)
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return *this ;
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x = source.x ;
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y = source.y ;
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z = source.z ;
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return *this ;
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}
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bool Point3D::operator==(const Point3D &source) const
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{
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if (this == &source)
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return true ;
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return
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x == source.x &&
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y == source.y &&
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z == source.z ;
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}
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bool Point3D::operator<(const Point3D &source) const
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{
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if (x < source.x)
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return true ;
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if (x > source.x)
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return false ;
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if (y < source.y)
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return true ;
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if (y > source.y)
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return false ;
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if (z < source.z)
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return true ;
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return false ;
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}
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Point3D::operator std::string(void) const
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{
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ostringstream oss ;
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oss << *this ;
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return oss.str() ;
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}
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/**
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* @return \em true if either #x, #y or #z is non-zero.
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* @return \em false if #x, #y and #z are defined to 0.
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*/
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Point3D::operator bool(void) const
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{
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return
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x != 0 &&
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y != 0 &&
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z != 0 ;
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}
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ostream& operator<<(ostream &os, const Point3D &p)
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{
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os << "(" << p.x << ";" << p.y << ";" << p.z << ")" ;
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return os ;
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}
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size_t hash_value(const Point3D &source)
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{
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size_t seed = 0 ;
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boost::hash_combine(seed, source.x) ;
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boost::hash_combine(seed, source.y) ;
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boost::hash_combine(seed, source.z) ;
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return seed ;
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}
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