Repair plotting script of elastic-tube-3d (#450)

* Repair plotting script of elastic-tube-3d

* Work with folder name in the script plot-displacements.sh

* Retore plot-all-displacements.sh file

* Clarify how plotting scripts work in the README

* Formatting

elastic-tube-3d/README.md

@@ -37,7 +37,7 @@ You can visualize the results using paraView or `cgx`(for native CalculiX result
 
 ![result tube](images/tutorials-elastic-tube-3d-tube-result.png)
 
-You can also plot the displacement of the midpoint of the tube by running `sh plot-displacement.sh <filename>`. The displacement plot for each solver combination looks like:
+You can also plot the displacement of the midpoint of the tube for each participant individually by running `sh plot-displacements.sh <filename>`. If you have run all the solver combinations and want to compare the plots, you can run `sh plot-all-displacements.sh` which looks like:
 
 ![plot tube](images/tutorials-elastic-tube-3d-plot.png)
 

elastic-tube-3d/plot-all-displacements.sh

@@ -2,7 +2,7 @@
 
 gnuplot -p << EOF                                                               
 	set grid                                                                        
-	set title 'displacement at the middle of the tube                                        
+	set title 'displacement at the middle of the tube'                                        
 	set xlabel 'time [s]'                                                           
 	set ylabel 'displacement [m]'
 	set term pngcairo enhanced size 900,654

elastic-tube-3d/plot-displacements.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+if [ "${1:-}" = "" ]; then
+    echo "No target directory specified. Please specify the directory of the solid participant containing the watchpoint, e.g. ./plot-displacements.sh solid-calculix."
+    exit 1
+fi
+
+FILE="$1/precice-Solid-watchpoint-Tube-Midpoint.log"
+
+if [ ! -f "$FILE" ]; then
+    echo "Unable to locate the watchpoint file (precice-Solid-watchpoint-Tube-Midpoint.log) in the specified solid directory '${1}'. Make sure the specified directory matches the solid participant you used for the calculations."
+    exit 1
+fi
+
+gnuplot -p << EOF                                                               
+	set grid                                                                        
+	set title 'displacement of the tube midpoint'                                        
+	set xlabel 'time [s]'                                                           
+	set ylabel 'displacement of the tube midpoint [m]'
+	set term pngcairo enhanced size 900,654
+	set output "images/tutorials-elastic-tube-3d-displacement-watchpoints.png"
+	plot "$1/precice-Solid-watchpoint-Tube-Midpoint.log" using 1:5 with lines title "$1 tube midpoint circumferential", \
+	     "$1/precice-Solid-watchpoint-Tube-Midpoint.log" using 1:6 with lines title "$1 tube midpoint radial", \
+	     "$1/precice-Solid-watchpoint-Tube-Midpoint.log" using 1:7 with lines title "$1 tube midpoint axial"
+EOF
+
+echo "Plot saved in images/tutorials-elastic-tube-3d-displacement-watchpoints.png"