CGAL 4.7 - 2D Generalized Barycentric Coordinates: Barycentric_coordinates_2/Triangle_coordinates_example.cpp

\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.7 - 2D Generalized Barycentric Coordinates

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Barycentric_coordinates_2/Triangle_coordinates_example.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Barycentric_coordinates_2/Triangle_coordinates_2.h>
// Some convenient typedefs.
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::FT Scalar;
typedef Kernel::Point_2 Point;
typedef std::vector<Scalar> Scalar_vector;
typedef CGAL::Barycentric_coordinates::Triangle_coordinates_2<Kernel> Triangle_coordinates;
using std::cout; using std::endl; using std::string;
int main()
{
// Construct a triangle.
const Point first_vertex(0.0f, 0.0f);
const Point second_vertex(2.0f, 0.5f);
const Point third_vertex(1.0f, 2.0f);
// Create an std::vector to store coordinates.
Scalar_vector coordinates;
// Instantiate the class Triangle_coordinates_2 for the triangle defined above.
Triangle_coordinates triangle_coordinates(first_vertex, second_vertex, third_vertex);
// Print some information about the triangle and coordinates.
triangle_coordinates.print_information();
// Instantiate some interior, boundary, and exterior query points for which we compute coordinates.
const int number_of_query_points = 18;
const Point query_points[] = { Point(0.5f , 0.5f ), Point(1.0f, 0.5f ), Point(1.0f , 0.75f), Point(1.0f , 1.0f), // interior query points
Point(1.0f , 1.25f), Point(1.0f, 1.5f ), Point(0.75f, 1.0f ), Point(1.25f, 1.0f), Point(1.5f, 0.75f),
Point(1.0f , 0.25f), Point(0.5f, 1.0f ), Point(1.5f , 1.25f), Point(1.0f , 2.0f), Point(2.0f, 0.5f ), // boundary query points
Point(0.25f, 1.0f ), Point(0.5f, 1.75f), Point(1.5f , 1.75f), Point(1.75f, 1.5f) // exterior query points
};
// Reserve memory to store triangle coordinates for 18 query points.
coordinates.reserve(number_of_query_points * 3);
// Compute triangle coordinates for these points.
cout << endl << "Computed triangle coordinates: " << endl << endl;
for(int i = 0; i < number_of_query_points; ++i) {
triangle_coordinates(query_points[i], std::inserter(coordinates, coordinates.end()));
// Output the coordinates for each point.
cout << "Point " << i + 1 << ": ";
for(int j = 0; j < 3; ++j)
cout << "coordinate " << j + 1 << " = " << coordinates[i * 3 + j] << "; ";
cout << endl << endl;
}
return EXIT_SUCCESS;
}