[add][fix] added demo ping.csv file and fixed gnuplot extension

plotter/pinger.gp

@@ -0,0 +1,94 @@
+# config
+csv_file="../data/ping.csv"
+# space seperates list of SERVER:LABEL where SERVER is the filter for col_server
+server_list=" \
+             127.0.0.1:my_pc \
+             0.0.0.0.:still_my_pc \
+             localhost:my_other_local \
+             example.com:example \
+             "
+# timezone offset in seconds
+tz=0
+
+# table setup
+col_time=1
+col_server=2
+col_packet_loss=3
+col_min=4
+col_average=5
+col_max=6
+col_deviation=7
+
+if(exists("TZ")) tz=TZ*3600
+# gnuplot does not like spaces in -e so we recreate them here via system call to sed
+if(exists("SERVERS")) server_list=system("echo '".SERVERS."' | sed 's|;| |g'")
+if(exists("CSV_FILE")) csv_file=CSV_FILE
+
+# helper function
+server(n) = word(server_list ,n)
+# csv settings
+set datafile separator ','
+
+# output settings
+#set terminal pngcairo size 800,600 enhanced font 'Segoe UI,10' # pngcairo cleaner than png
+set output 'ping.png'
+set encoding utf8
+
+# data settings
+set xdata time # tells gnuplot the x axis is time data
+set timefmt "%s" # for iso 8601 use: "%Y-%m-%dT%H:%M:%S%:z"
+set format x "%d.%m.%y - %H:%M"
+set key autotitle columnhead
+
+# styling
+## legend
+set key box lt rgb "#000000"
+set key width 1.5
+set key height 0.5
+set key samplen 0.1
+set key center top
+## axis
+set y2tics # enable second axis
+set ytics nomirror # dont show the tics on that side
+set y2range [5:100]
+if (exists("Y_MAX")) set yrange [*:Y_MAX]
+if (exists("X_MAX")) set xrange [*:X_MAX+tz]
+if (exists("X_MIN")) set xrange [X_MIN+tz:*]
+if (exists("X_MIN") && exists("X_MAX")) set xrange [X_MIN+tz:X_MAX+tz]
+#set format y2 "%s perc"
+## labels
+set xlabel sprintf("Time (UTC: %+03d:00)", tz/3600)
+set ylabel "Latency (ms)"
+set y2label "Package Loss (%)" # label for second axis
+set xtics rotate # rotate labels on the x axis
+## grid
+set style line 100 lt 1 lc rgb "grey" lw 0.5 # linestyle for the grid
+set grid ls 100 # enable grid with specific linestyle
+## lines and points
+set style line 1 lt rgb "#1e88e5"
+set style line 2 lt rgb "#43a047"
+set style line 3 lt rgb "#d81b60"
+set style line 4 lt rgb "#f57c00"
+
+#plot for [server in server_list] csv_file using 1:(stringcolumn(3) eq server[1:strstrt(server, ":")-1] ? column(7) : NaN) ti server
+
+# [ping] + [packet loss] + [packet loss border] + [packet loss legend]
+plot for [i=1:words(server_list)] \
+    csv_file using (column(col_time) + tz):(stringcolumn(col_server) eq server(i)[1:strstrt(server(i), ":")-1] ? column(col_average) : NaN) \
+        ti server(i)[strstrt(server(i), ":")+1:*] \
+        ls i \
+        pointtype 7 ps 0.5, \
+    for [i=1:words(server_list)] \
+    csv_file using (column(col_time) + tz):(stringcolumn(col_server) eq server(i)[1:strstrt(server(i), ":")-1] ? column(col_packet_loss) : NaN) \
+        notitle \
+        axis x1y2 \
+        ls i lt rgb "#000000" \
+        pointtype 13 lw 0.5, \
+    for [i=1:words(server_list)] \
+    csv_file using (column(col_time) + tz):(stringcolumn(col_server) eq server(i)[1:strstrt(server(i), ":")-1] ? column(col_packet_loss) : NaN) \
+        notitle \
+        axis x1y2 \
+        ls i \
+        pointtype 13 ps 0.65, \
+    NaN with points pt 12 lc rgb "black" title "Packet Loss" 
+