private static IEnumerable <Vector3> ArcVertices(IArc arc, IArc nextArc, Sweepline sweepline)
{
if (arc.LeftNeighbour == arc.Site)
{
var azimuths = DrawingUtilities.AnglesInRange(0, 2 * Mathf.PI, NumberOfVerticesPerArc);
var vertices = azimuths.Select(azimuth => PointOnEllipse(arc, azimuth, sweepline)).ToList();
return(vertices);
}
else if (Mathf.Approximately((float)arc.Site.Priority, (float)sweepline.Priority))
{
var intersection = arc.PointOfIntersection(sweepline).ToUnityVector3();
var site = arc.Site.Position.ToUnityVector3();
var downArc = DrawingUtilities.VerticesOnGeodesic(intersection, site, NumberOfVerticesPerArc);
var upArc = DrawingUtilities.VerticesOnGeodesic(site, intersection, NumberOfVerticesPerArc);
var vertices = downArc.Concat(upArc);
return(vertices);
}
else
{
var leftLimit = DrawingUtilities.AzimuthOf(arc.LeftIntersection(sweepline).ToUnityVector3());
var rightLimit = DrawingUtilities.AzimuthOf(nextArc.LeftIntersection(sweepline).ToUnityVector3());
var azimuths = DrawingUtilities.AnglesInRange(leftLimit, rightLimit, NumberOfVerticesPerArc);
var vertices = azimuths.Select(azimuth => PointOnEllipse(arc, azimuth, sweepline)).ToList();
return(vertices);
}
}
private static IEnumerable <Vector3> VerticesInEdge(Vertex origin, Vertex destination)
{
var originVector = origin.Position.ToUnityVector3();
var destinationVector = destination.Position.ToUnityVector3();
if (originVector == destinationVector || Vector3.Cross(originVector, destinationVector) != new Vector3(0, 0, 0))
{
return(DrawingUtilities.VerticesOnGeodesic(originVector, destinationVector, NumberOfVerticesPerEdge));
}
else
{
var commonSites = origin.Sites.Intersect(destination.Sites).ToList();
var normal = -(commonSites.First().Position.ToUnityVector3() - commonSites.Last().Position.ToUnityVector3()).normalized;
return(DrawingUtilities.VerticesOnHalfOfGreatCircle(originVector, normal, NumberOfVerticesPerEdge));
}
}