Adjusted the velocity calculations to allow for Acceleration/Deceleration of the boats, rather than just coming to a complete halt when the sails are pulled in.

#story[986]

src/main/java/seng302/models/Yacht.java

@@ -4,8 +4,6 @@ import static seng302.utilities.GeoUtility.getGeoCoordinate;
 
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-
 import javafx.scene.paint.Color;
 import seng302.client.ClientPacketParser;
 import seng302.controllers.RaceViewController;
@@ -119,18 +117,29 @@ public class Yacht {
      * @param timeInterval since last update in milliseconds
      */
     public void update(Long timeInterval) {
-        if (sailIn) {
         Double secondsElapsed = timeInterval / 1000000.0;
         Double windSpeedKnots = GameState.getWindSpeedKnots();
         Double trueWindAngle = Math.abs(GameState.getWindDirection() - heading);
         Double boatSpeedInKnots = PolarTable.getBoatSpeed(windSpeedKnots, trueWindAngle);
-            velocity = boatSpeedInKnots / ClientPacketParser.MS_TO_KNOTS * 1000;
-            Double metersCovered = velocity * secondsElapsed;
-            location = getGeoCoordinate(location, heading, metersCovered);
-        } else {
+        Double maxBoatSpeed = boatSpeedInKnots / ClientPacketParser.MS_TO_KNOTS * 1000;
+        if (sailIn && velocity <= maxBoatSpeed) { // Acceleration
+            if (velocity < maxBoatSpeed) {
+                velocity += maxBoatSpeed / 25;
+                if (velocity > maxBoatSpeed) {
+                    velocity = maxBoatSpeed;
+                }
+            }
+        } else { // Deceleration
+            if (velocity > 0) {
+                velocity = velocity -= maxBoatSpeed / 25;
+                if (velocity < 0) {
                     velocity = 0d;
                 }
             }
+        }
+        Double metersCovered = velocity * secondsElapsed;
+        location = getGeoCoordinate(location, heading, metersCovered);
+    }
 
 
     public Double getHeading() {