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XYL_DISPLAY_OPENGL
Display 2D Points and Lines Using OpenGL {#xyl_display_opengl-display-2d-points-and-lines-using-opengl align="center"}

XYL_DISPLAY_OPENGL is a C++ program which reads XYL information defining points and lines in 2D, and draws a picture using OPENGL.

The point and line information is stored in a pair of files, called the XYL format. Essentially, the first file stores a list of point coordinates, and the second lists point indices to be connected in lines.

Usage: {#usage align="center"}

xyl_display_opengl prefix

where

  • prefix is the common prefix for the point and line data files.

reads the point coordinate data from prefix.xy and the point index lists from prefix.xyl and displays a plot of the points and lines.

Licensing: {#licensing align="center"}

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

Languages: {#languages align="center"}

XYL_DISPLAY_OPENGL is available in a C++ version.

Related Data and Programs: {#related-data-and-programs align="center"}

BOX_PLOT, a MATLAB program which can color in specified entries of a checkerboard, corresponding to pairs of integer data.

CAUSTIC_OPENGL, a C++ program which computes a caustic curve and displays it using OpenGL.

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

FLOOD_OPENGL, a C program which allows a user to select a region and flood it with color, using OpenGL, by Art Wetzel.

LIFE_OPENGL, a C program which plays John Conway's "Game of Life", using OpenGL to display the results.

LISSAJOUS_OPENGL, a C++ program which computes a Lissajous figure and displays it using OpenGL.

OPENGL, C++ programs which illustrate the use of the OpenGL graphics library;

POLYGONAL_SURFACE_DISPLAY_OPENGL, a C++ program which displays a surface in 3D described as a set of polygons, using OpenGL.

ROTATING_CUBE_DISPLAY_OPENGL, a C++ program which displays a rotating color cube in 3D, using OpenGL;

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.

TABLE_DELAUNAY, a FORTRAN90 program which computes the Delaunay triangulation of a set of points.

TABLE_VORONOI, a C++ program which computes information about the Voronoi diagram of the points.

TRIANGULATION_DISPLAY_OPENGL, a C++ program which reads files defining a triangulation and displays an image using Open GL.

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, a MATLAB program which reads XYL information defining points and lines in 2D, and displays an image in a MATLAB graphics window.

Reference: {#reference align="center"}

  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: {#source-code align="center"}

Examples and Tests: {#examples-and-tests align="center"}

  • house.xy, point coordinates.
  • house.xyl, point indices to be connected as lines.
  • house.png, a PNG image of the screen generated by Open GL.

List of Routines: {#list-of-routines align="center"}

  • MAIN is the main program for XYL_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.
  • DTABLE_DATA_READ reads the data from a real TABLE file.
  • DTABLE_HEADER_READ reads the header from a real TABLE file.
  • 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.
  • TIMESTRING returns the current YMDHMS date as a string.
  • XY_DATA_READ reads the data in an XY file.
  • XY_HEADER_READ reads the header of an XY file.
  • XYL_DATA_READ reads the data in an XYL file.
  • XYL_HEADER_READ determines the number of line items in an XYL file.

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

Last revised on 06 January 2009.