GEOMPACK
Delaunay triangulation
GEOMPACK
is a FORTRAN77 library which
computes the Delaunay triangulation of a set of points in the plane,
by Barry Joe.
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
GEOMPACK is available in
a C version and
a C++ version and
a FORTRAN77 version and
a FORTRAN90 version and
a MATLAB version.
Related Data and Programs:
DELAUNAY_TREE_2D,
a C++ program which
computes the Delaunay triangulation of a 2D dataset;
DUTCH,
a FORTRAN90 library which
carries out tasks in computational geometry.
GEOMETRY,
a FORTRAN77 library which
performs geometric calculations in 2, 3 and N dimensional space.
GEOMPACK2,
a more extensive FORTRAN90 library,
from which GEOMPACK was extracted.
GEOMPACK3,
a FORTRAN90 library which
handles 3D geometric problems.
SWEEP2,
a C program which
computes Voronoi Diagrams or Delaunay triangulations,
by Steve Fortune;
SPHERE_DELAUNAY,
a FORTRAN90 program which
computes and plots the Delaunay triangulation of points on the unit sphere.
TABLE_DELAUNAY,
a FORTRAN90 program which
reads a file of point coordinates in the TABLE format and writes out
the Delaunay triangulation.
TRIANGULATION,
a FORTRAN77 library which
performs various operations on order 3 (linear) or order 6 (quadratic) triangulations.
TRIANGULATION_DISPLAY_OPENGL,
a C++ program which
reads files defining a triangulation and displays an image using OpenGL.
TRIANGULATION_TRIANGLE_NEIGHBORS,
a FORTRAN90 program which
reads data defining a triangulation, determines the neighboring
triangles of each triangle, and writes that information to a file.
Author:
Original FORTRAN77 version by Barry Joe;
This FORTRAN77 version by John Burkardt.
Reference:

Franz Aurenhammer,
Voronoi diagrams 
a study of a fundamental geometric data structure,
ACM Computing Surveys,
Volume 23, Number 3, pages 345405, September 1991.

Barry Joe,
GEOMPACK  a software package for the generation of meshes
using geometric algorithms,
Advances in Engineering Software,
Volume 13, pages 325331, 1991.
Source Code:
Examples and Tests:
List of Routines:

ALPHA_MEASURE determines the triangulated pointset quality measure ALPHA.

ANGLE_RAD_2D returns the angle swept out between two rays in 2D.

ARC_COSINE computes the arc cosine function, with argument truncation.

DIAEDG chooses a diagonal edge.

DTRIS2 constructs a Delaunay triangulation of 2D vertices.

GET_UNIT returns a free FORTRAN unit number.

I4_MODP returns the nonnegative remainder of integer ( kind = 4 ) division.

I4_SWAP swaps two I4's.

I4_WRAP forces an I4 to lie between given limits by wrapping.

I4MAT_TRANSPOSE_PRINT prints an I4MAT, transposed.

I4MAT_TRANSPOSE_PRINT_SOME prints some of the transpose of an I4MAT.

I4VEC_HEAP_D reorders an I4VEC into an descending heap.

I4VEC_SORT_HEAP_A ascending sorts an I4VEC using heap sort.

I4VEC_SORTED_UNIQUE finds the unique elements in a sorted I4VEC.

LRLINE determines if a point is left of, right or, or on a directed line.

PERM_CHECK checks that a vector represents a permutation.

PERM_INV inverts a permutation "in place".

POINTS_DELAUNAY_NAIVE_2D is a naive Delaunay triangulation scheme.

POINTS_HULL_2D computes the convex hull of a set of points in 2D.

QUAD_CONVEX_RANDOM returns a random convex quadrilateral.

R82VEC_PART_QUICK_A reorders an R82VEC as part of a quick sort.

R82VEC_PERMUTE permutes an R82VEC in place.

R82VEC_SORT_HEAP_INDEX_A does an indexed heap ascending sort of an R82VEC.

R82VEC_SORT_QUICK_A ascending sorts an R82VEC using quick sort.

R8MAT_TRANSPOSE_PRINT prints an R8MAT, transposed.

R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.

R8MAT_UNIFORM_01 returns a unit pseudorandom R8MAT.

R8VEC_EQ is true if two R8VEC's are equal.

R8VEC_GT == ( A1 > A2 ) for R8VEC's.

R8VEC_LT == ( A1 < A2 ) for R8VEC's.

R8VEC_PRINT prints an R8VEC.

R8VEC_SWAP swaps the entries of two R8VEC's.

SWAPEC swaps diagonal edges until all triangles are Delaunay.

TIMESTAMP prints the current YMDHMS date as a time stamp.

TRIANGLE_CIRCUMCENTER_2D computes the circumcenter of a triangle in 2D.

TRIANGULATION_ORDER3_PLOT plots a 3node triangulation of a set of nodes.

TRIANGULATION_ORDER3_PRINT prints information about a Delaunay triangulation.

VBEDG determines which boundary edges are visible to a point.
You can go up one level to
the FORTRAN77 source codes.
Last revised on 23 October 2012.