XYZL_DISPLAY_OPENGL
Display 3D Points and Lines Using OpenGL

XYZL_DISPLAY_OPENGL is a C++ program which reads XYZL information defining 3D points and lines, and displays an image using OpenGL.

The program displays the data, and slowly rotates it.

The program SXYZ_DELAUNAY, which creates a Delaunay triangulation on a sphere, is an example of a program whose output is in the form that this program can display.

Usage:

xyzl_display_opengl prefix

reads the XYZ coordinate data in prefix.xyz and the line information in prefix.xyzl, and displays a plot of the points and lines. The image will slowly rotate. Successive mouse clicks alternate the axis of rotation from the X, to the Y, to the Z axis and back again.

Licensing:

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

Languages:

XYZL_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.

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

XYZ, a data directory which contains some examples of 3D pointsets.

XYZ_DISPLAY_OPENGL, a C++ program which reads an XYZ file of 3D point coordinates, and displays an image of those points using OpenGL.

XYZF, a data directory which contains some examples of sets of 3D points and faces.

XYZF_DISPLAY_OPENGL, a C++ program which reads XYZF information defining points and faces in 3D, and displays an image using OpenGL.

XYZL, a data directory which contains some examples of sets of 3D points and lines.

XYZL_DISPLAY, a MATLAB program which reads XYZL information defining points and lines in 3D, and displays an image in a MATLAB graphics window.

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:

• xyzl_display_opengl.cpp, the source code.
• xyzl_display_opengl.sh, commands to compile the source code.

Examples and Tests:

• dodecahedron.xyz, the 12 vertices of a dodecahedron.
• dodecahedron.xyzl, information defining lines between the vertices.
• dodecahedron.png, a PNG image of the screen generated by Open GL.

List of Routines:

• MAIN is the main program for XYZL_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.
• I4VEC_MAX returns the value of the maximum element in an I4VEC.
• I4VEC_MIN returns the value of the minimum element in an I4VEC.
• MOUSE determines the response to mouse input.
• MYINIT initializes OpenGL state variables dealing with viewing and attributes.
• MYRESHAPE determines the window mapping.
• R8_MAX returns the maximum of two R8's.
• R8_MIN returns the minimum of two R8's.
• R83VEC_MAX returns the maximum value in an R83VEC.
• R83VEC_MIN returns the minimum value in an R83VEC.
• 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.
• SPIN_IMAGE adjusts the angle of rotation and redisplays the picture.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TIMESTRING returns the current YMDHMS date as a string.
• XYZ_DATA_PRINT prints the data for an XYZ file.
• XYZ_DATA_READ reads the data in an XYZ file.
• XYZ_HEADER_PRINT prints the header of an XYZ file.
• XYZ_HEADER_READ reads the header of an XYZ file.
• XYZL_DATA_PRINT prints the data of an XYZL file.
• XYZL_DATA_READ reads the data in an XYZL file.
• XYZL_HEADER_PRINT prints the header of an XYZL file.
• XYZL_HEADER_READ determines the number of line items in an XYZL file.

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