#!/usr/bin/env bash

# @(#) s1	Demonstrate overlay plot, straight line in gnuplot.
# See:
# http://www.ibm.com/developerworks/library/l-gnuplot/
#
# http://www.gnuplot.info/docs_4.2/gnuplot.html

# Section 1, setup, pre-solution, $Revision: 1.23 $".
# Infrastructure details, environment, debug commands for forum posts. 
# Uncomment export command to run script as external user.
# export PATH="/usr/local/bin:/usr/bin:/bin" HOME=""
set +o nounset
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
edges() { _n="$1" _f="$2";head -n $_n $_f; pe "  ---";tail -n $_n $_f ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C gnuplot
set -o nounset
pe

FILE=${1-g1}

# Display sample of data file(s).
db " Section 1: display of input data."
pe " || start sample "
edges 3 $FILE
pe
edges 3 data1
pe " || end"

# Section 2, solution.
pl " Results:"
db " Section 2: solution."
gnuplot g1

exit 0

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
GNU bash 3.2.39
gnuplot 4.2 patchlevel 2 

 || start sample 
reset
# set terminal png nocrop enhanced font "/usr/share/fonts/liberation/LiberationMono-Regular.ttf" 10 size 1200,600 xffffff
set terminal dumb 50 20
  ---
strate(x) = 330000
plot 'data1', strate(x)
exit

1 0
2 110000
3 220000
  ---
3 220000
4 330000 
5 440000
 || end

-----
 Results:


  450000 ++---+----+---+----+----+----+---+---+A
         +    +    +   +    +    +    +   +    +
  400000 ++...................................++
  350000 ++...................................++
         #############################A#########
  300000 ++...................................++
  250000 ++...................................++
         |    :    :   :    A    :    :   :    |
  200000 ++...................................++
  150000 ++...................................++
         |    :    :   :    :    :    :   :    |
  100000 ++........A..........................++
   50000 ++...................................++
         +    +    +   +    +    +    +   +    +
       0 A+---+----+---+----+----+----+---+---++
         1   1.5   2  2.5   3   3.5   4  4.5   5
            +-'data1'---A---strate(x)-######+
            +-------------------------------+