I don’t know it is regular to ask about source code, but I ask my question:

In mathematics and computational geometry, a Delaunay triangulation for a given set P of discrete points in a plane is a triangulation DT§ such that no point in P is inside the circumcircle of any triangle in DT§. A Voronoi diagram is a kind of tesselation that divided the medium into polygons in 2D and polyhedrons in 3D.

I want to know is there any library to calculated the Voronoi diagram in two-dimension and three-dimension. I also have data of Delaunay triangulation via a written-code from myself. So, if there is any library that determines the Voronoi diagram from Delaunay triangulation, it would be desired.

I will appreciate any comments that give me a little help and forgive me for writing shortcomings.

Are any of John Burkardt’s 1327 (!) Fortran codes relevant? “Voronoi tessellation” and “Delaunay triangulation” appear in the descriptions of several of them.

I code I work on uses parts of Javier Bernal’s suite of programs refractored into modules. Selected Developed Software
That refactoring was done before I was involved, and I cannot vouch that the underlying code is “nice”, only that it works.

You may consider interfacing with the C qhull library, which is what scipy wraps for its Delaunay/Voronoi function. I have not tried this myself, though.

I also find a library in c++. Probably, I use the interface approach with other libraries in three-dimensional.
Do you know interface with which language (Python, C++, or C) has enough speed?

Thanks for your comment.
“* VORNBR: determines the Voronoi neighbors of an eyepoint.”
As mentioned on the page, it has just one subroutine to find neighbors in two-dimensional and not a whole of Voronoi diagram.