created Branch car

finished all TODOS in car and created needed method getID and getVelocity.

src/main/java/ch/zhaw/pm2/racetrack/Car.java

@@ -3,6 +3,8 @@ package ch.zhaw.pm2.racetrack;
 import ch.zhaw.pm2.racetrack.given.CarSpecification;
 import ch.zhaw.pm2.racetrack.strategy.MoveStrategy;
 
+import java.util.Vector;
+
 /**
  * Class representing a car on the racetrack.
  * Uses {@link PositionVector} to store current position on the track grid and current velocity vector.
@@ -48,17 +50,39 @@ public class Car implements CarSpecification {
         setPosition(position);
     }
 
+    /**
+     * Returns the id of the car.
+     *
+     * @return id of the car.
+     */
+    public char getID(){
+        return id;
+    }
+
+    /**
+     * Returns the current velocity of the car as a PositionVector.
+     *
+     * @return velocity current velocity of the car.
+     */
+    public PositionVector getVelocity(){
+        return velocity;
+    }
     /**
      * Set this Car position directly, regardless of current position and velocity.
      * This should only be used by the game controller in rare cases to set the crash or winning position.
      * The next position is normaly automatically calculated and set in the {@link #move()} method.
      *
      * @param position The new position to set the car directly to.
+     * @throws IllegalArgumentException if invalid PositionVector is given.
      */
     @Override
     public void setPosition(final PositionVector position) {
-        // TODO: implementation
+        if (position.getX() < 0 || position.getY() < 0) {
-        throw new UnsupportedOperationException();
+            throw new IllegalArgumentException();
+        }
+        else {
+            this.position = position;
+        }
     }
 
     /**
@@ -69,8 +93,7 @@ public class Car implements CarSpecification {
      */
     @Override
     public PositionVector nextPosition() {
-        // TODO: implementation
+        return new PositionVector(position.getX() + velocity.getX(),position.getY() + velocity.getY());
-        throw new UnsupportedOperationException();
     }
 
     /**
@@ -80,11 +103,18 @@ public class Car implements CarSpecification {
      * Changes only velocity, not position.
      *
      * @param acceleration A Direction vector containing the amounts to add to the velocity in x and y dimension
+     * @throws IllegalArgumentException if PositionVector is not in allowed area.
      */
     @Override
     public void accelerate(PositionVector.Direction acceleration) {
-        // TODO: implementation
+        if(acceleration.vector.getX() < -1 || acceleration.vector.getX() > 1||
-        throw new UnsupportedOperationException();
+            acceleration.vector.getY() < -1 || acceleration.vector.getY() > 1) {
+            throw new IllegalArgumentException();
+        }
+        else {
+            velocity = new PositionVector(velocity.getX() + acceleration.vector.getX(),
+                velocity.getY() + acceleration.vector.getY());
+        }
     }
 
     /**
@@ -92,8 +122,7 @@ public class Car implements CarSpecification {
      */
     @Override
     public void move() {
-        // TODO: implementation
+        position = new PositionVector(position.getX() + velocity.getX(), position.getY() + velocity.getY());
-        throw new UnsupportedOperationException();
     }
 
     /**
@@ -101,8 +130,7 @@ public class Car implements CarSpecification {
      */
     @Override
     public void crash() {
-        // TODO: implementation
+        crashed = true;
-        throw new UnsupportedOperationException();
     }
 
     /**
@@ -112,13 +140,12 @@ public class Car implements CarSpecification {
      */
     @Override
     public boolean isCrashed() {
-        // TODO: implementation
+        return crashed;
-        throw new UnsupportedOperationException();
     }
 
     /**
      * Set move strategy
-     * @param moveStrategy
+     * @param moveStrategy Strategy to be implemented
      */
     public void setMoveStrategy(MoveStrategy moveStrategy) {
         this.moveStrategy = moveStrategy;