Sails command now applies acceleration to boat

- Race only has control over speed while Sails command is not in action
- This is governed by a default velocity property on the boat
- Sails command returns control when sails are out and boat is up to speed
- Speed never falls below 0
- Speed never goes above VMG velocity to prevent exploitation

#story[1196]

racevisionGame/src/main/java/mock/model/commandFactory/SailsCommand.java

@@ -10,7 +10,6 @@ import java.util.Observable;
 public class SailsCommand extends ObserverCommand {
     private boolean sailsOut;
     private double goalVelocity;
-    private double acceleration = 1;
 
     public SailsCommand(MockRace race, MockBoat boat, boolean sailsOut) {
         super(race, boat);
@@ -20,6 +19,8 @@ public class SailsCommand extends ObserverCommand {
     @Override
     public void execute() {
         this.boat.setSailsOut(this.sailsOut);
+        boat.setVelocityDefault(false);
+
         if(sailsOut) {
             // Accelerate to VMG speed
             double polarSpeed = NewPolars.calculateSpeed(race.getWindDirection(), race.getWindSpeed(), boat.getBearing());
@@ -33,12 +34,18 @@ public class SailsCommand extends ObserverCommand {
 
     @Override
     public void update(Observable o, Object arg) {
+        double acceleration = 0.5;
+
         if(sailsOut && boat.getCurrentSpeed() < goalVelocity) {
-            // Apply acceleration
+            boat.setCurrentSpeed(Math.min(goalVelocity, boat.getCurrentSpeed() + acceleration));
         } else if (!sailsOut && boat.getCurrentSpeed() > goalVelocity) {
-            // Apply deceleration
+            // Apply deceleration to strictly 0 speed
+            boat.setCurrentSpeed(Math.max(0, boat.getCurrentSpeed() - acceleration));
         } else {
             System.out.println(goalVelocity + " " + boat.getCurrentSpeed());
+
+            // Release boat from SailsCommand control
+            if(sailsOut) boat.setVelocityDefault(true);
             race.deleteObserver(this);
         }
     }