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A really fast C++ library for Delaunay triangulation of 2D points

License: MIT License

Shell 0.73% JavaScript 0.03% C++ 84.74% Python 10.78% C 0.50% Makefile 0.46% CMake 1.60% M4 0.68% Starlark 0.48%

delaunator-cpp's Introduction

delaunator-cpp

A really fast C++ library for Delaunay triangulation of 2D points.

delaunator-cpp was originally a a C++ port from https://github.com/mapbox/delaunator, a JavaScript implementation of very fast 2D Delaunay algorithm. It has since diverged from that source.

Features

A fast C++ open source 2D Delaunay implementation
Example showing triangulation of GeoJson points

Usage

examples/basic.cpp

#include <delaunator.hpp>
#include <cstdio>

int main() {
    /* x0, y0, x1, y1, ... */
    std::vector<double> coords = {-1, 1, 1, 1, 1, -1, -1, -1};

    //triangulation happens here
    delaunator::Delaunator d(coords);

    for(std::size_t i = 0; i < d.triangles.size(); i+=3) {
        printf(
            "Triangle points: [[%f, %f], [%f, %f], [%f, %f]]\n",
            d.coords[2 * d.triangles[i]],        //tx0
            d.coords[2 * d.triangles[i] + 1],    //ty0
            d.coords[2 * d.triangles[i + 1]],    //tx1
            d.coords[2 * d.triangles[i + 1] + 1],//ty1
            d.coords[2 * d.triangles[i + 2]],    //tx2
            d.coords[2 * d.triangles[i + 2] + 1] //ty2
        );
    }
}

See more examples here

Benchmarks

Run on (4 X 2300 MHz CPU s)
2018-09-29 09:27:28
------------------------------------------------------------
Benchmark                     Time           CPU Iterations
------------------------------------------------------------
BM_45K_geojson_nodes         22 ms         22 ms         32
BM_uniform/2000               1 ms          1 ms        982
BM_uniform/100000            63 ms         62 ms          9
BM_uniform/200000           140 ms        140 ms          4
BM_uniform/500000           400 ms        399 ms          2
BM_uniform/1000000          994 ms        993 ms          1

Library is ~10% faster then JS version for 1M uniform points (details)

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