/// <summary>
/// helper method to respawn the tank at a random location on the map
/// </summary>
/// <param name="tank"></param>
private void RespawnTank(Tank tank)
{
tank.setLocation(new Vector2D(RandomCoordinate(), RandomCoordinate()));
while (collided(tank, new Vector2D(0, 0)))
{
tank.setLocation(new Vector2D(RandomCoordinate(), RandomCoordinate()));
}
tank.Activate();
}