use transparent color for parallel request plots

pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotFileGenerator.java

@@ -17,8 +17,8 @@ public class GnuplotFileGenerator implements Appender {
 
         final StringBuilder result = new StringBuilder();
 
-        appendfln(result, "set terminal %s noenhanced size %d,%d", settings.getTerminal(), settings.getWidth(),
-                settings.getHeight());
+        appendfln(result, "set terminal %s truecolor noenhanced size %d,%d", settings.getTerminal(),
+                settings.getWidth(), settings.getHeight());
 
         appendfln(result, "set datafile separator \"%s\"", settings.getDatafileSeparator());
         appendfln(result, "set timefmt '%s'", settings.getTimefmt());
@@ -67,13 +67,15 @@ public class GnuplotFileGenerator implements Appender {
         // appendfln(result, "set xrange [-1:1]");
         appendfln(result, "set boxwidth 0.5");
 
+        appendfln(result, "set style fill transparent solid 0.5");
+
         settings.getAggregates().addPlots(result, dataSeries, settings);
 
         // Add a plot outside of the visible range. Without this gnuplot would not
         // render images when there are not data points on it.
         appendf(result, "-1 with lines notitle");
 
-        LOGGER.info("{}", result);
+        LOGGER.debug("{}", result);
 
         return result.toString();
     }

pdb-plotting/src/main/java/org/lucares/recommind/logs/LineStyle.java

@@ -26,7 +26,7 @@ public class LineStyle {
     }
 
     public String asGnuplotLineStyleDark() {
-        return asGnuplotLineStyle(color.getDark());
+        return asGnuplotLineStyle("77" + color.getDark());
     }
 
     @Override