add a gnuplot/shell script

GravityField/plotation.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+set -e
+
+SRC=WS/data/00013.txt
+DST=graph.png
+
+rm WS/graph/*.png
+
+# ----------------------------------------------------------
+plot_a_map ()
+{
+NUMERO=$1
+
+SRC=$(printf "WS/data/%05d.txt"    $NUMERO)
+DST=$(printf "WS/graph/%05d.png"   $NUMERO)
+TXT=$(printf "Mass bodies #%05d"   $NUMERO)
+
+echo "    " $SRC $DST "      " $TXT
+
+gnuplot << __EOC__
+set term png    size 512,512
+set xrange    [ 0.0 : 1024 ]
+set yrange    [ 0.0 : 1024 ]
+set output      "${DST}"
+set ytics       256
+set xtics       256
+set grid        front
+set title       "${TXT}"
+plot            "$SRC"  using 1:2 title "location" 
+__EOC__
+}
+# ----------------------------------------------------------
+
+for foo in $(seq 0 8 1999)
+do
+	plot_a_map $foo
+done
+
+convert -delay 10 WS/graph/0????.png foo.gif
+
+# ----------------------------------------------------------