private CdtEdge FindEdge(PolylinePoint a, PolylinePoint b, Cdt cdt)
{
int aIsAboveB = Cdt.Above(a.Point, b.Point);
System.Diagnostics.Debug.Assert(aIsAboveB != 0);
if (aIsAboveB > 0)
{
foreach (var e in cdt.FindSite(a.Point).Edges)
{
if (e.lowerSite.Point == b.Point)
{
return(e);
}
}
}
else
{
foreach (var e in cdt.FindSite(b.Point).Edges)
{
if (e.lowerSite.Point == a.Point)
{
return(e);
}
}
}
throw new InvalidOperationException("cannot find an edge of a polyline in the tessellation");
}
internal CdtEdge EdgeBetweenUpperSiteAndLowerSite(CdtSite b)
{
Debug.Assert(Cdt.Above(this, b) > 0);
if (Edges != null)
{
foreach (var edge in Edges)
{
if (edge.lowerSite == b)
{
return(edge);
}
}
}
return(null);
}
///<summary>
///</summary>
///<param name="a"></param>
///<param name="b"></param>
public CdtEdge(CdtSite a, CdtSite b)
{
var above = Cdt.Above(a.Point, b.Point);
if (above == 1)
{
upperSite = a;
lowerSite = b;
}
else
{
Debug.Assert(above != 0);
lowerSite = a;
upperSite = b;
}
upperSite.AddEdgeToSite(this);
}