/// <summary>
/// Reverses a given events list in a way that the line has the opposite direction.
/// </summary>
/// <param name="events"></param>
/// <param name="line"></param>
/// <returns></returns>
protected List <Tuple <IntVector2, bool> > ReverseEvents(List <Tuple <IntVector2, bool> > events, OrthogonalLine line)
{
var eventsCopy = new List <Tuple <IntVector2, bool> >(events);
if (events.Count == 0)
{
return(events);
}
eventsCopy.Reverse();
var newEvents = new List <Tuple <IntVector2, bool> >();
if (events.Last().Item2)
{
newEvents.Add(Tuple.Create(line.To, true));
}
foreach (var @event in eventsCopy)
{
if (!(@event.Item1 == line.From && @event.Item2 == true))
{
newEvents.Add(Tuple.Create(@event.Item1 - line.GetDirectionVector(), [email protected]));
}
}
return(newEvents);
}
/// <summary>
/// Transform door line according to a given transformation.
/// </summary>
/// <param name="doorLine"></param>
/// <param name="transformation"></param>
/// <returns></returns>
public static IDoorLine TransformDoorLine(IDoorLine doorLine, Transformation transformation)
{
var doorPosition = doorLine.Line;
if (doorPosition.GetDirection() == OrthogonalLine.Direction.Undefined)
{
throw new InvalidOperationException("Cannot fix door direction when original direction is undefined");
}
switch (transformation)
{
case Transformation.Identity:
return(doorLine);
case Transformation.Rotate90:
return(new DoorLine(doorPosition.Rotate(90), doorLine.Length));
case Transformation.Rotate180:
return(new DoorLine(doorPosition.Rotate(180), doorLine.Length));
case Transformation.Rotate270:
return(new DoorLine(doorPosition.Rotate(270), doorLine.Length));
}
// Other transformations need to switch door directions
var firstStartPoint = doorPosition.From.Transform(transformation);
var lastStartPoint = doorPosition.To.Transform(transformation);
var length = doorLine.Length;
var transformedDirection = TransformDirection(doorPosition.GetDirection(), transformation);
var transformedLine = new OrthogonalLine(firstStartPoint, lastStartPoint, transformedDirection);
var lastEndPoint = lastStartPoint + length * transformedLine.GetDirectionVector();
var newDirection = OrthogonalLine.GetOppositeDirection(transformedDirection);
var newDoorPosition = new OrthogonalLine(lastEndPoint, lastEndPoint + transformedLine.Length * transformedLine.SwitchOrientation().GetDirectionVector(), newDirection);
if (newDoorPosition.Length != doorPosition.Length)
{
throw new InvalidOperationException();
}
return(new DoorLine(newDoorPosition, doorLine.Length));
}