GRF_DISPLAY_OPENGL
Display a GRF Graph Using OpenGL

GRF_DISPLAY_OPENGL is a C++ program which reads a GRF file containing information about an abstract graph and displays a plot using OPENGL.

Usage:

grf_display_opengl prefix

• prefix.grf is the GRF file.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

GRF_DISPLAY_OPENGL is available in a C++ version.

Related Data and Programs:

FERN_OPENGL, a C++ program which uses OpenGL to display the Barnsley fractal fern.

GRAFFITI, a dataset directory which contains 195 abstract graphs, with adjacency and embedding information, stored in the GRF format.

GRAPH_REPRESENTATION, a data directory of examples of ways of representing abstract mathematical graphs

GRF, a data directory which contains a description of the GRF format and some examples.

GRF_DISPLAY, a MATLAB program which reads a GRF file and displays a plot in the MATLAB graphics window.

GRF_IO, a C++ library which reads or writes a GRF file;

GRF_TO_EPS, a FORTRAN90 program which can make an encapsulated PostScript image of a GRF file.

GRF_TO_XYL, a FORTRAN90 program which converts information describing the adjacency and embedding of an abstract graph from GRF to XYL format.

SCREENSHOT_OPENGL, a C++ program which shows how a program using the OpenGL graphics library can save a screenshot of the graphics being displayed.

SPHERE_XYZ_DISPLAY_OPENGL, a C++ program which reads XYZ information defining points in 3D, and displays a unit sphere and the points, using OpenGL.

XYL, a data directory which contains some examples of the XYL format for 2D points and lines.

XY_DISPLAY_OPENGL, a C++ program which reads an XY file of 2D point coordinates, and displays an image of those points using OpenGL.

XYF_DISPLAY_OPENGL, a C++ program which reads XYF information defining points and faces in 2D, and displays an image using OpenGL.

XYL_DISPLAY_OPENGL, a C++ program which reads XYL information defining points and lines in 2D, and displays an image using OpenGL.

Reference:

1. Edward Angel,
   Interactive Computer Graphics, a Top-Down Approach with OpenGL,
   Addison-Wesley, 2000,
   ISBN: 0-201-38597-X,
   LC: T385.A514.
2. Renate Kempf, Chris Frazier, editors,
   OpenGL Reference Manual,
   Fourth Edition,
   Addison-Wesley, 2004,
   ISBN: 032117383X,
   LC: T385.O642
3. Mason Woo, Jackie Neider, Tom Davis,
   OpenGL Programming Guide,
   Addison-Wesley, 1997,
   ISBN: 0-201-46138-2,
   LC: T385.N435
4. Richard Wright, Michael Sweet,
   OpenGL Superbible,
   Third Edition,
   Sams, 2004,
   ISBN: 0672326019,
   LC: T385.W73
5. http://www.opengl.org/
   The official OpenGL site.

Source Code:

• grf_display_opengl.cpp, the source code.

Examples and Tests:

COXETER is the Coxeter graph.

• coxeter.grf, is a GRF file defining the Coxeter graph.
• coxeter.png, a PNG image of the plot.

List of Routines:

• MAIN is the main program for GRF_DISPLAY_OPENGL.
• CH_EQI is true if two characters are equal, disregarding case.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• DISPLAY generates the graphics output.
• GRF_DATA_PRINT prints the data of a GRF file.
• GRF_DATA_READ reads the data of a GRF file.
• GRF_HEADER_PRINT prints the header of a GRF file.
• GRF_HEADER_READ reads the header of a GRF file.
• I4VEC_MAX returns the value of the maximum element in an I4VEC.
• I4VEC_MIN returns the value of the minimum element in an I4VEC.
• MYINIT initializes OpenGL state variables dealing with viewing and attributes.
• R8_MAX returns the maximum of two R8.
• R82VEC_MAX returns the maximum value in a R82VEC.
• R82VEC_MIN returns the minimum value in a R82VEC.
• S_CAT concatenates two strings to make a third string.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• S_WORD_COUNT counts the number of "words" in a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• XYL_DATA_PRINT prints the data of an XYL file.
• XYL_HEADER_PRINT prints the header of an XYL file.

You can go up one level to the C++ source codes.