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racevisionGame/src/main/java/visualiser/Controllers/RaceViewController.java

@@ -323,8 +323,19 @@ public class RaceViewController extends Controller {
             AnimationTimer sailsFollowBoat = new AnimationTimer() {
                 @Override
                 public void handle(long now) {
+                    double windDir = visualiserRace.getVisualiserRaceState().getWindDirection().degrees();
+                    double windOffset = (360 - windDir + boat.getBearing().degrees()) % 360;
+                    double sailDir =  windOffset / 180 * 270 + windDir + 180;
+                    boolean leftOfWind = windOffset >= 180;
+                    if (leftOfWind){
+                        System.out.println("is left");
+                        sailDir = -sailDir;
+                    } else {
+                        System.out.println("is right");
+                        sailDir = windDir - sailDir;
+                    }
                     if (boat.isSailsOut()) {
-                        sailsSubject.setHeading(visualiserRace.getVisualiserRaceState().getWindDirection().degrees() + 90);
+                        sailsSubject.setHeading(sailDir);
                         if (sails3D.isLuffing()) {
                             sails3D.stopLuffing();
                         }