// Direction can be one of "up" or "down". This begins the process of changing the lane.
// Later, the GameObject should call `racer.CompleteChangeLanes()` to finish the transition.
// TODO: Check if the lane that they're transitioning to is occupied by a thing? Should that
// be handled at the data layer? Probably.
public bool ChangeLanes(string direction)
{
// If a lane change is already underway, then we simply return `false`.
if (this.isChangingLanes)
{
return(false);
}
// Determine a possible `nextLane`.
int nextLane = direction == "up" ? Lanes.IncreaseLane(this.lane) : Lanes.DecreaseLane(this.lane);
// Check if a car is already in that lane
bool carIsThere = this.carExistsInLane(nextLane, this.position);
if (carIsThere)
{
return(false);
}
// If our current lane is the `nextLane`, then we must be at a boundary. We can't move in
// this direction, so we return false.
if (this.lane == nextLane)
{
return(false);
}
// Otherwise, we set the car to `isChangingLanes`, update our `nextLane`, and return `true`.
this.isChangingLanes = true;
this.nextLane = nextLane;
return(true);
}