bug6066: implement additional metrics for signed/unsigned relative XTE;

the value is computed relative to half the leg length (computed as great
circle distance between its from/to waypoints)

java/com.sap.sailing.datamining/resources/stringmessages/Sailing_StringMessages.properties

@@ -249,8 +249,10 @@ TotalDistanceToNeighboursPerpendicularToStarLineAtStartOfRace=Sum of absolute di
 TotalWindwardDistanceToNeighboursAtStartOfRace=Sum of absolute windward distances to start line neighbors at race start
 TotalDistanceToNeighboursProjectedToStartLineAtStartOfRace=Sum of along-line distances to start line neighbors (or end of line, respectively) at race start
 IRM=IRM Code (OCS, DNC, DNF, etc.)
-XTE=Cross-Track Error
-AbsoluteXTE=Absolute Cross-Track Error
+XTE=Cross-Track Error, signed (- = left, + = right)
+AbsoluteXTE=Absolute Cross-Track Error, unsigned
+XTERelativeSigned=Relative Cross-Track Error, signed (-1 = 1/2 leg length left, 0 = middle, +1 = 1/2 leg length right)
+XTERelativeUnsigned=Relative Cross-Track Error, unsigned (0 = middle, 1 = 1/2 leg length out)
 Day=Day
 CompetitorDay=Competitor Day
 CompetitorDaySailingDomainRetrieverChain=Competitor-Day for race

java/com.sap.sailing.datamining/resources/stringmessages/Sailing_StringMessages_de.properties

@@ -252,8 +252,10 @@ TotalDistanceToNeighboursPerpendicularToStarLineAtStartOfRace=Summe der absolute
 TotalWindwardDistanceToNeighboursAtStartOfRace=Summe der windwärtigen absoluten Abstände zu beiden Startlinien-Nachbarn
 TotalDistanceToNeighboursProjectedToStartLineAtStartOfRace=Summe der Abstände zu beiden Startlinien-Nachbarn bzw. den Enden der Linie, projiziert auf die Startlinie
 IRM=IRM Code (OCS, DNC, DNF etc.)
-XTE=Querabweichung
-AbsoluteXTE=Absolute Querabweichung
+XTE=Absolute Querabweichung, vorzeichenbehaftet (- = links, + = rechts)
+AbsoluteXTE=Absolute Querabweichung, ohne Vorzeichen
+XTERelativeSigned=Relative Querabweichung, mit Vorzeichen (-1 = 1/2 Schenkellänge links, 0 = Mitte, +1 = 1/2 Schenkellänge rechts)
+XTERelativeUnsigned=Relative Querabweichung, ohne Vorzeichen (0 = Mitte, 1 = ganz aussen)
 Day=Tag
 CompetitorDay=Teilnehmer-Tag
 CompetitorDaySailingDomainRetrieverChain=Teilnehmer-Tag für Wettfahrt

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/data/HasGPSFixContext.java

@@ -36,6 +36,12 @@ public interface HasGPSFixContext {
     @Statistic(messageKey = "AbsoluteXTE", resultDecimals = 2)
     Distance getAbsoluteXTE();
     
+    @Statistic(messageKey = "XTERelativeSigned", resultDecimals = 2)
+    Double getRelativeXTESigned();
+    
+    @Statistic(messageKey = "XTERelativeUnsigned", resultDecimals = 2)
+    Double getRelativeXTEUnsigned();
+    
     @Statistic(messageKey = "SmoothedSpeed", resultDecimals = 2)
     Speed getSmoothedSpeed();
     

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/impl/data/GPSFixWithContext.java

@@ -93,6 +93,23 @@ public class GPSFixWithContext implements HasGPSFixContext {
         return getTrackedLegOfCompetitorContext().getTrackedLegOfCompetitor().getAbsoluteCrossTrackError(getTimePoint());
     }
     
+    @Override
+    public Double getRelativeXTESigned() {
+        // The XTE is calculated relative to half the leg length
+        return getTrackedLegOfCompetitorContext().getTrackedLegOfCompetitor().getSignedCrossTrackError(getTimePoint())
+                .divide(getTrackedLegOfCompetitorContext().getTrackedLegContext().getTrackedLeg().getGreatCircleDistance(getTimePoint()))
+                * 2.0; // half the leg length
+    }
+    
+    @Override
+    public Double getRelativeXTEUnsigned() {
+        // The XTE is calculated relative to the leg length
+        return getTrackedLegOfCompetitorContext().getTrackedLegOfCompetitor().getAbsoluteCrossTrackError(getTimePoint())
+                .divide(getTrackedLegOfCompetitorContext().getTrackedLegContext().getTrackedLeg().getGreatCircleDistance(getTimePoint()))
+                * 2.0; // half the leg length
+    }
+    
+
     @Override
     public TackType getTackType() throws NoWindException {
         return getTrackedLegOfCompetitorContext().getTrackedLegOfCompetitor().getTackType(getTimePoint());