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gdpc - a program for visualising molecular dynamic simulations  
Copyright (C) 1999 Jonas Frantz   

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

My email :

  GDPC Documentation

  1.	Background
  2.	Usage
  3.	Input file formats
  4.	Source files and compiling
  5.	Reporting bugs, suggesting features and known bugs
  6.	Disclaimer
  7.	About the author

  1.	Background

    gdpc was written as a replacement for dpc, a visualising tool for molecular
  dynamics. dpc was written in the beginning of the nineties by Kai Nordlund
  and had various problems with event handling. Kai asked me to take a look at
  it, and fix it if I could. After writing the original sourcecode, Kai had 
  added many different features, leaving the code as a total mess. I had no
  chance of making out what was wrong with it, so I decided to try to write it 
  from scratch using GTK+.

    After some weeks of coding I had a usable version of it, which I asked some 
  of my co-workers to try out. They gave me suggestions for new features and
  reported bugs, after some more weeks of coding I implemented the graphical
  setupwindow so new users could learn to use it more easily.
  After major code cleanup in version 1.20, I decided that gdpc was stable and 
  bugfree enough that it could be released to the public.

  2.	Usage

    gdpc is mainly and most easily used from the graphical initialization
  window but for faster usage I recommend the command prompt. Using gdpc:s
  setupwindow is almost selfexplanatory, if you cant figure out what an option
  does test it. From the command prompt the only necessary options to run gdpc 
  are the column representations and the input file.
  The column representations describe from what column gdpc tries to read
  certain data, the first column respresents x, the second y, the third z and 
  the fourth t. If the input file s in xyz format the t column will be skipt 
  and the time will be read from the input datas headers.

    The usage of the program is pretty easy to learn and by doing some testing 
  with it you should learn to master it.
  To demonstrate gdpc I have included som example input files liquid.out and, the first being in general file format and the other in xyz file

  They can best be tested with the commands:
  gdpc cube 30 m 2 d 20 erase 1 2 3 4 liquid.test
  gdpc m 2 d 10 erase xyz 2 3 4 5 md.test
  gdpc m 2 d 10 erase usetypes xyz 2 3 4 5 manytypes.test

  3.	Input file formats

    The general file format consists of at least four coulmns of data, x,y,z and t.
  gdpc will read data to each frame as long as the t column data stays the same,
  after that it will plot the frame and start reading the next frames data.

    The xyz file format consists of several frames with their own headers. 
  The header consists of two lines, the first consists of only one number the
  number of atoms. The second line is a comment line and it is from this line 
  that gdpc searches for the time, actually it searches for the string "fs" and
  when found it, takes the number before this string.
  Then follows as many lines of atom data as was declared on the first row of 
  the header. After reading the data it expects another header directly after the
  atomdata has ended.

  4.	Source files and compiling

  main.c	The programs main code can be found in this file. The confi-
		guration of the window and calling other important functions
		is handled here.
  drawatoms.c	This file contains functions relevant to the drawing of the
		atoms to the pixmap and the rotating of the coordinates.
  readinput.c	This file contains the functions which handles reading the 
		data from the inputfile.
  rotate.c	This files contain functions that handle the buttons of the
  sort.c	This file contains a function for sorting the coordinates.
  colors.c	In this file the settings of the colorschemes are made.
  setup.c	This file contains the functions for the graphical initialization 
		and setup window and everything related to it.
  parameters.h	This file contains default parameters for most options, the
		version number and some basic structures.

  To compile gdpc you have to have gtk+ 1.2 and Imlib installed on your system.
  You can get gtk+ from and you'll find Imlib on gdpc has to this moment been compiled on 
  Redhat 6.0 both i386 and alpha architectures, but I can't see why it 
  wouldn't be compilable in another environment as long as you have gtk+ and 
  Imlib properly installed.

  5.	Repoting bugs, suggesting features and known bugs

    Bugs can be reported to or to
  Please include the input files you were running, the exact parameters used
  when the bug occured and a reproducable description of what you're doing when
  the bug occures.

    New features can be reported to, dont expect them to 
  get implemented at the moment of the arrival of the mail, because I got other
  things to do as well.

    No known bugs at this moment (V 1.28)

  6.	Disclaimer

  I can not be held responsible if this program fucks up your computer. gdpc comes
  with no warranty.

  7.	About the author

    My name is Jonas Frantz, when I'm not working as a research associate at the
  Helsinki University accelerator lab I'm studying physics. I'm beginning my third
  year of studies this fall and I expect to finish them in about 1-2 years.

    My summerjob at the acceleratorlab contains of simulating SiGe interface recoils,
  if you don't know anything about materialphysics, I can tell you that it 
  practically about giving a kinetic energy to one atom in the SiGe interface and
  to watch what happends (mostly atomic movement over the interface(mixing)).

    Update Summer 2000 : This summer I'm simulation bond breaking in Si, primarily 
  electronic sputtering of Si surfaces and recristallisation of amorphous areas in

    gdpc is a very useful tool in visualising what happends in the simulation and 
  creating demonstrative pictures from them and I have had lots of help from it.