/// <summary>
/// Get a set of vertical elements which start on this floor
/// </summary>
/// <param name="parentBuilding"></param>
/// <returns></returns>
private IReadOnlyList <ConstrainedVerticalSelection> ConstrainVerticalElements(IBuilding parentBuilding)
{
//Get all vertical selections which start on this floor
var starting = parentBuilding
.Verticals(FloorIndex, FloorIndex)
.Where(a => a.StartingFloor() == FloorIndex)
.ToArray();
//Create somewhere to put results
var results = new ConstrainedVerticalSelection[starting.Length];
//Inspect all the floors which overlap each vertical, and constrain the area the vertical can be placed in
for (var i = 0; i < starting.Length; i++)
{
var verticalSelection = starting[i];
//Get all floors this feature overlaps
var crossedFloors = (
from f in Enumerable.Range(verticalSelection.Bottom, verticalSelection.Top - verticalSelection.Bottom + 1)
select parentBuilding.Floor(f)
).ToArray();
//Calculate the intersection of all crossed floor footprints
var intersection = IntersectionOfFootprints(crossedFloors);
results[i] = new ConstrainedVerticalSelection(verticalSelection, intersection);
}
return(results);
}