plot exactly the selected time frame

Before gnuplot would only plot the range with values.
But that is not really helpful, when you navigate with the new
navigation buttons.

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

@@ -20,6 +20,7 @@ public class GnuplotFileGenerator {
 		appendfln(result, "set format x \"%s\"", settings.getFormatX());
 		appendfln(result, "set xlabel \"%s\"", settings.getXlabel());
 		appendfln(result, "set xtics rotate by %d", settings.getRotateXAxisLabel());
+		appendfln(result, "set xrange [\"%s\":\"%s\"]", settings.getDateFrom(), settings.getDateTo());
 
 		appendfln(result, "set ylabel \"%s\"", settings.getYlabel());
 		if (settings.getYAxisScale() == AxisScale.LOG10) {

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

@@ -28,6 +28,8 @@ public class GnuplotSettings {
 	// set xtics rotate by 10 degree
 	private int rotateXAxisLabel = -10;
 	private AxisScale yAxisScale;
+	private String dateFrom;
+	private String dateTo;
 
 	public GnuplotSettings(final Path output) {
 		this.output = output;
@@ -117,6 +119,22 @@ public class GnuplotSettings {
 		return yAxisScale;
 	}
 
+	public void setDateFrom(final String dateFrom) {
+		this.dateFrom = dateFrom;
+	}
+
+	public String getDateFrom() {
+		return dateFrom;
+	}
+
+	public void setDateTo(final String dateTo) {
+		this.dateTo = dateTo;
+	}
+
+	public String getDateTo() {
+		return dateTo;
+	}
+
 	// plot 'sample.txt' using 1:2 title 'Bytes' with linespoints 2
 
 }

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

@@ -9,9 +9,7 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.LinkOption;
 import java.nio.file.Path;
-import java.time.Instant;
 import java.time.OffsetDateTime;
-import java.time.ZoneOffset;
 import java.time.format.DateTimeFormatter;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
@@ -78,8 +76,12 @@ public class Plotter {
 
 			final Result result = db.get(query, groupBy);
 
-			OffsetDateTime maxDate = OffsetDateTime.ofInstant(Instant.ofEpochMilli(Long.MIN_VALUE), ZoneOffset.UTC);
+			// OffsetDateTime maxDate =
-			OffsetDateTime minDate = OffsetDateTime.ofInstant(Instant.ofEpochMilli(Long.MAX_VALUE), ZoneOffset.UTC);
+			// OffsetDateTime.ofInstant(Instant.ofEpochMilli(Long.MIN_VALUE),
+			// ZoneOffset.UTC);
+			// OffsetDateTime minDate =
+			// OffsetDateTime.ofInstant(Instant.ofEpochMilli(Long.MAX_VALUE),
+			// ZoneOffset.UTC);
 
 			for (final GroupResult groupResult : result.getGroups()) {
 
@@ -93,8 +95,10 @@ public class Plotter {
 				if (dataSerie.getValues() > 0) {
 					dataSeries.add(dataSerie);
 
-					maxDate = maxDate.compareTo(csvSummary.getMaxDate()) > 0 ? maxDate : csvSummary.getMaxDate();
+					// maxDate = maxDate.compareTo(csvSummary.getMaxDate()) > 0
-					minDate = minDate.compareTo(csvSummary.getMinDate()) < 0 ? minDate : csvSummary.getMinDate();
+					// ? maxDate : csvSummary.getMaxDate();
+					// minDate = minDate.compareTo(csvSummary.getMinDate()) < 0
+					// ? minDate : csvSummary.getMinDate();
 				}
 			}
 
@@ -109,7 +113,7 @@ public class Plotter {
 			final GnuplotSettings gnuplotSettings = new GnuplotSettings(outputFile);
 			gnuplotSettings.setHeight(height);
 			gnuplotSettings.setWidth(width);
-			defineXAxis(gnuplotSettings, minDate, maxDate);
+			defineXAxis(gnuplotSettings, plotSettings.dateFrom(), plotSettings.dateTo());
 
 			gnuplotSettings.setYAxisScale(plotSettings.getYAxisScale());
 			gnuplot.plot(gnuplotSettings, dataSeries);
@@ -131,6 +135,8 @@ public class Plotter {
 
 		String formatX;
 		int rotateX;
+		String formattedMinDate;
+		String formattedMaxDate;
 		if (minDate.until(maxDate, ChronoUnit.WEEKS) > 1) {
 			formatX = "%Y-%m-%d";
 			rotateX = 0;
@@ -139,9 +145,13 @@ public class Plotter {
 			formatX = "%Y-%m-%d %H:%M:%S";
 			rotateX = gnuplotSettings.getRotateXAxisLabel();
 		}
+		formattedMinDate = minDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
+		formattedMaxDate = maxDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
 
 		gnuplotSettings.setFormatX(formatX);
 		gnuplotSettings.setRotateXAxisLabel(rotateX);
+		gnuplotSettings.setDateFrom(formattedMinDate);
+		gnuplotSettings.setDateTo(formattedMaxDate);
 	}
 
 	private String uniqueDirectoryName() {