geometry/example/c01_custom_point_example.cpp at develop · boostorg/geometry · GitHub

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// Boost.Geometry (aka GGL, Generic Geometry Library)

// Use, modification and distribution is subject to the Boost Software License,

// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

// Custom point Example

#include <iostream>

#include <boost/geometry/algorithms/distance.hpp>

#include <boost/geometry/algorithms/make.hpp>

#include <boost/geometry/geometries/register/point.hpp>

#include <boost/geometry/strategies/strategies.hpp>

#include <boost/geometry/io/dsv/write.hpp>

// Sample point, defining three color values

struct my_color_point

{

double red, green, blue;

};

// Sample point, having an int array defined

struct my_array_point

{

int c[3];

};

// Sample point, having x/y

struct my_2d

{

float x,y;

};

// Sample class, protected and construction-time-only x/y,

// Can (of course) only used in algorithms which take const& points

class my_class_ro

{

public:

my_class_ro(double x, double y) : m_x(x), m_y(y) {}

double x() const { return m_x; }

double y() const { return m_y; }

private:

double m_x, m_y;

};

// Sample class using references for read/write

class my_class_rw

{

public:

const double& x() const { return m_x; }

const double& y() const { return m_y; }

double& x() { return m_x; }

double& y() { return m_y; }

private:

double m_x, m_y;

};

// Sample class using getters / setters

class my_class_gs

{

public:

const double get_x() const { return m_x; }

const double get_y() const { return m_y; }

void set_x(double v) { m_x = v; }

void set_y(double v) { m_y = v; }

private:

double m_x, m_y;

};

// Sample point within a namespace

namespace my

{

struct my_namespaced_point

{

double x, y;

};

}

BOOST_GEOMETRY_REGISTER_POINT_3D(my_color_point, double, cs::cartesian, red, green, blue)

BOOST_GEOMETRY_REGISTER_POINT_3D(my_array_point, int, cs::cartesian, c[0], c[1], c[2])

BOOST_GEOMETRY_REGISTER_POINT_2D(my_2d, float, cs::cartesian, x, y)

BOOST_GEOMETRY_REGISTER_POINT_2D_CONST(my_class_ro, double, cs::cartesian, x(), y())

BOOST_GEOMETRY_REGISTER_POINT_2D(my_class_rw, double, cs::cartesian, x(), y())

BOOST_GEOMETRY_REGISTER_POINT_2D_GET_SET(my_class_gs, double, cs::cartesian, get_x, get_y, set_x, set_y)

BOOST_GEOMETRY_REGISTER_POINT_2D(my::my_namespaced_point, double, cs::cartesian, x, y)

int main()

{

// Create 2 instances of our custom color point

my_color_point c1 = boost::geometry::make<my_color_point>(255, 3, 233);

my_color_point c2 = boost::geometry::make<my_color_point>(0, 50, 200);

// The distance between them can be calculated using the cartesian method (=pythagoras)

// provided with the library, configured by the coordinate_system type of the point

std::cout << "color distance "

<< boost::geometry::dsv(c1) << " to "

<< boost::geometry::dsv(c2) << " is "

<< boost::geometry::distance(c1,c2) << std::endl;

my_array_point a1 = {{0}};

my_array_point a2 = {{0}};

boost::geometry::assign_values(a1, 1, 2, 3);

boost::geometry::assign_values(a2, 3, 2, 1);

std::cout << "color distance "

<< boost::geometry::dsv(a1) << " to "

<< boost::geometry::dsv(a2) << " is "

<< boost::geometry::distance(a1,a2) << std::endl;

my_2d p1 = {1, 5};

my_2d p2 = {3, 4};

std::cout << "float distance "

<< boost::geometry::dsv(p1) << " to "

<< boost::geometry::dsv(p2) << " is "

<< boost::geometry::distance(p1,p2) << std::endl;

my_class_ro cro1(1, 2);

my_class_ro cro2(3, 4);

std::cout << "class ro distance "

<< boost::geometry::dsv(cro1) << " to "

<< boost::geometry::dsv(cro2) << " is "

<< boost::geometry::distance(cro1,cro2) << std::endl;

my_class_rw crw1;

my_class_rw crw2;

boost::geometry::assign_values(crw1, 1, 2);

boost::geometry::assign_values(crw2, 3, 4);

std::cout << "class r/w distance "

<< boost::geometry::dsv(crw1) << " to "

<< boost::geometry::dsv(crw2) << " is "

<< boost::geometry::distance(crw1,crw2) << std::endl;

my_class_gs cgs1;

my_class_gs cgs2;

boost::geometry::assign_values(cgs1, 1, 2);

boost::geometry::assign_values(cgs2, 3, 4);

std::cout << "class g/s distance "

<< boost::geometry::dsv(crw1) << " to "

<< boost::geometry::dsv(crw2) << " is "

<< boost::geometry::distance(cgs1,cgs2) << std::endl;

my::my_namespaced_point nsp1 = boost::geometry::make<my::my_namespaced_point>(1, 2);

my::my_namespaced_point nsp2 = boost::geometry::make<my::my_namespaced_point>(3, 4);

std::cout << "namespaced distance "

<< boost::geometry::dsv(nsp1) << " to "

<< boost::geometry::dsv(nsp2) << " is "

<< boost::geometry::distance(nsp1,nsp2) << std::endl;

return 0;

}

geometry/example/c01_custom_point_example.cpp at develop · boostorg/geometry · GitHub

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