public RoadMovementComponent TurnAround()
{
var newDirection = Direction.Flip();
if (Progress.IsZero)
{
var newDistance = Road.GetDistanceFor(newDirection);
return(new RoadMovementComponent(Road, newDistance, newDirection));
}
// Math.
{
// Don't remove 100d part. It specifies decimal type here.
var oldDistanceValue = Road.GetDistanceFor(Direction).Value;
var oldProgressValue = Progress.Value;
var oldProgressPercentage = oldProgressValue * 100d / oldDistanceValue;
var newProgressPercentage = 100 - oldProgressPercentage;
var newDistanceValue = Road.GetDistanceFor(newDirection).Value;
var newProgressValue = newDistanceValue * newProgressPercentage / 100d;
var newProgress = new Distance(Round(newProgressValue));
return(new RoadMovementComponent(Road, newProgress, newDirection));
}
}
public RoadMovementComponent Move(Distance progress)
{
var newProgress = Progress + progress;
var distance = Road.GetDistanceFor(Direction);
if (newProgress > distance)
{
throw new InvalidOperationException("Can't progress beyond distance.");
}
return(new RoadMovementComponent(
Road, newProgress, Direction));
}