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delaunator_wrapper.cpp
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delaunator_wrapper.cpp
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/*
* Copyright (c) 2018, Danish Agency for Data Supply and Efficiency <sdfe@sdfe.dk>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "delaunator.hpp"
#include <stdlib.h> // for malloc/free
#ifdef _WIN32
#define SHARED_EXPORT __declspec(dllexport)
#else
#define SHARED_EXPORT
#endif
extern "C" {
SHARED_EXPORT void triangulate(unsigned long long num_vertices, double *vertices, int *ptr_num_faces, int **ptr_faces)
{
std::vector<double> coords;
//TODO can the vector be constructed directly from the pointer?
for (unsigned long long i = 0; i < num_vertices; i++)
{
coords.push_back(vertices[2*i + 0]);
coords.push_back(vertices[2*i + 1]);
}
// Actually perform triangulation
delaunator::Delaunator triangulation(coords);
int num_faces = triangulation.triangles.size() / 3;
int *faces = (int *)malloc(num_faces * 3 * sizeof(int));
for (int i = 0; i < num_faces; i++)
{
faces[3*i + 0] = triangulation.triangles[3*i + 0];
faces[3*i + 1] = triangulation.triangles[3*i + 1];
faces[3*i + 2] = triangulation.triangles[3*i + 2];
}
*ptr_faces = faces;
*ptr_num_faces = num_faces;
}
SHARED_EXPORT void free_face_data(int **ptr_faces)
{
free(*ptr_faces);
*ptr_faces = NULL;
}
}