added DelegateCoordinateSystem to make a coordinate system changeable; added clear method on FixesAndTails and use when coordinate system changes

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/shared/racemap/DelegateCoordinateSystem.java

@@ -0,0 +1,54 @@
+package com.sap.sailing.gwt.ui.client.shared.racemap;
+
+import com.google.gwt.maps.client.base.LatLng;
+import com.sap.sailing.domain.common.Bearing;
+import com.sap.sailing.domain.common.Position;
+
+/**
+ * Holds a {@link CoordinateSystem} that can be exchanged, using {@link #setCoordinateSystem}.
+ * 
+ * @author Axel Uhl (D043530)
+ *
+ */
+public class DelegateCoordinateSystem implements CoordinateSystem {
+    private CoordinateSystem coordinateSystem;
+    
+    public DelegateCoordinateSystem(CoordinateSystem coordinateSystem) {
+        super();
+        this.coordinateSystem = coordinateSystem;
+    }
+
+    public CoordinateSystem getCoordinateSystem() {
+        return coordinateSystem;
+    }
+
+    public void setCoordinateSystem(CoordinateSystem coordinateSystem) {
+        this.coordinateSystem = coordinateSystem;
+    }
+
+    @Override
+    public Position map(Position position) {
+        return coordinateSystem.map(position);
+    }
+
+    @Override
+    public Bearing map(Bearing bearing) {
+        return coordinateSystem.map(bearing);
+    }
+
+    @Override
+    public double mapDegreeBearing(double trueBearingInDegrees) {
+        return coordinateSystem.mapDegreeBearing(trueBearingInDegrees);
+    }
+
+    @Override
+    public LatLng toLatLng(Position position) {
+        return coordinateSystem.toLatLng(position);
+    }
+
+    @Override
+    public Position getPosition(LatLng p) {
+        return coordinateSystem.getPosition(p);
+    }
+
+}

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/shared/racemap/FixesAndTails.java

@@ -507,4 +507,19 @@ public class FixesAndTails {
         }
         return null;
     }
+
+    /**
+     * Clears all tail data, removing them from the map and from this object's internal structures. GPS fixes remain
+     * cached. Immediately after this call, {@link #getTail(CompetitorDTO)} will return <code>null</code> for all
+     * competitors. Tails will need to be created (again) using
+     * {@link #createTailAndUpdateIndices(CompetitorDTO, Date, Date, TailFactory)}.
+     */
+    protected void clearTails() {
+        for (Polyline tail : tails.values()) {
+            tail.setMap(null);
+        }
+        tails.clear();
+        firstShownFix.clear();
+        lastShownFix.clear();
+    }
 }

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/shared/racemap/RaceMap.java

@@ -142,7 +142,7 @@ public class RaceMap extends AbsolutePanel implements TimeListener, CompetitorSe
      * embedded in the map. The coordinate systems facilitates the possibility of transformed displays such as
      * rotated and translated versions of the map, implementing the "wind-up" view.
      */
-    private CoordinateSystem coordinateSystem;
+    private DelegateCoordinateSystem coordinateSystem;
     
     private FlowPanel headerPanel;
     private AbsolutePanel panelForLeftHeaderLabels;
@@ -362,8 +362,9 @@ public class RaceMap extends AbsolutePanel implements TimeListener, CompetitorSe
         this.competitorSelection = competitorSelection;
         competitorSelection.addCompetitorSelectionChangeListener(this);
         settings = new RaceMapSettings();
-        coordinateSystem = updateCoordinateSystemFromSettings();
+        coordinateSystem = new DelegateCoordinateSystem(new IdentityCoordinateSystem());
         fixesAndTails = new FixesAndTails(coordinateSystem);
+        updateCoordinateSystemFromSettings();
         lastTimeChangeBeforeInitialization = null;
         isMapInitialized = false;
         this.showViewStreamlets = showViewStreamlets;
@@ -378,11 +379,12 @@ public class RaceMap extends AbsolutePanel implements TimeListener, CompetitorSe
         combinedWindPanel.setVisible(false);
     }
     
-    private CoordinateSystem updateCoordinateSystemFromSettings() {
-        coordinateSystem = getSettings().isWindUp()
+    private void updateCoordinateSystemFromSettings() {
+        coordinateSystem.setCoordinateSystem(getSettings().isWindUp()
                 ? new RotateAndTranslateCoordinateSystem(/* TODO */ new DegreePosition(-33.957425, 25.679894), /* TODO */ new DegreeBearingImpl(180))
-                : new IdentityCoordinateSystem();
-        return coordinateSystem;
+                : new IdentityCoordinateSystem());
+        fixesAndTails.clearTails();
+        redraw();
     }
 
     private void loadMapsAPIV3(final boolean showMapControls) {