Wind now will occasionally back and veer (in some games, takes ~20min for full 180 degree rotation)

#story[1188]

racevisionGame/src/main/java/mock/model/wind/ShiftingWindGenerator.java

@@ -5,22 +5,23 @@ import shared.model.Wind;
 
 import java.util.Random;
 
-/**
- * Created by jjg64 on 28/08/17.
- */
 public class ShiftingWindGenerator implements WindGenerator {
-    Bearing baselineBearing;
-    double baseLineSpeed;
-    double windSpeedVariance = 5;
-    double bearingVariance = 5;  // In degrees
-    double oscillationVariance = 0.25;
-    double oscillationPeriod = 1e3 * 60 * 1;  // In milliseconds
+    private Bearing baselineBearing;
+    private double baseLineSpeed;
+    private double windSpeedVariance = 5;
+    private double bearingVariance = 5;  // In degrees
+    private double oscillationVariance = 0.25;
+    private double oscillationPeriod = 1e3 * 60 * 1;  // In milliseconds
+    private double shiftTime = 1e3 * 60;
+    private double shiftedSoFar = 0;
 
-    double timeOfLastOscillationReset = 0;
-    double timeOfLastChange = 0;
-    double timeSinceLastShift = 0; // Back / veer
+    private double timeOfLastOscillationReset = 0;
+    private double timeOfLastChange = 0;
+    private double timeOfLastShift = 0; // Back / veer
 
-    boolean anticlockwise = false;
+    private boolean anticlockwise = false;
+    private boolean shiftAnticlockwise = false;//true for Back, false for veer
+    private boolean shiftThisRace = Math.random() > 0.5;
 
     public ShiftingWindGenerator(Bearing baselineBearing, double baseLineSpeed) {
         this.baselineBearing = baselineBearing;
@@ -41,7 +42,7 @@ public class ShiftingWindGenerator implements WindGenerator {
     private Wind changeWind(Wind wind) {
         Wind newWind = new Wind(wind.getWindDirection(), wind.getWindSpeed());
         oscillateWind(newWind);
-        shiftWind(newWind);
+        if (shiftThisRace){shiftWind(newWind);}
         changeWindSpeed(newWind);
         timeOfLastChange = System.currentTimeMillis();
         return newWind;
@@ -78,6 +79,27 @@ public class ShiftingWindGenerator implements WindGenerator {
     }
 
     private void shiftWind(Wind wind) {
+        double timeSinceLastShift = System.currentTimeMillis() - timeOfLastShift;
+        double newBearing = wind.getWindDirection().degrees();
+        double degreeChange = 7;
+
+        if (timeSinceLastShift >= shiftTime){
+            shiftedSoFar += degreeChange;
+            if (shiftedSoFar >= 180){
+                shiftAnticlockwise = Math.random() > 0.5;
+                shiftedSoFar = 0;
+                System.out.println("Swapping");
+            }
+
+            timeOfLastShift = System.currentTimeMillis();
+            if (shiftAnticlockwise){
+                newBearing -= degreeChange;
+                wind.setWindDirection(Bearing.fromDegrees(newBearing % 360));
+            } else {
+                newBearing += degreeChange;
+                wind.setWindDirection(Bearing.fromDegrees(newBearing % 360));
+            }
+        }
     }
 
     private void changeWindSpeed(Wind wind) {