/// <summary>
/// add a function for each edge of this <see cref="Quad"/> to lookup the neighbors.
/// for <see cref="Quad"/> objects with siblings, these will be known, but for non-sibling
/// neighbors, these must be found through detection of others sharing the same edge
/// </summary>
private void AddNeighbors()
{
switch (QuadType)
{
case QuadType.BottomLeft:
// add siblings
AddNeighbor(EdgeType.Top, () => { return(Parent.GetChild(QuadType.TopLeft)); });
AddNeighbor(EdgeType.Right, () => { return(Parent.GetChild(QuadType.BottomRight)); });
// add non-siblings
AddNeighbor(EdgeType.Bottom, () =>
{
//GetParentsNeighbor(EdgeType.Bottom)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
return(null);
});
AddNeighbor(EdgeType.Left, () =>
{
//GetParentsNeighbor(EdgeType.Left)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
return(null);
});
break;
case QuadType.BottomRight:
// add siblings
AddNeighbor(EdgeType.Top, () => { return(Parent.GetChild(QuadType.TopRight)); });
AddNeighbor(EdgeType.Left, () => { return(Parent.GetChild(QuadType.BottomLeft)); });
// add non-siblings
AddNeighbor(EdgeType.Bottom, () =>
{
return(null); //GetParentsNeighbor(EdgeType.Bottom)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
});
AddNeighbor(EdgeType.Right, () =>
{
return(null); //GetParentsNeighbor(EdgeType.Right)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
});
break;
case QuadType.TopLeft:
// add siblings
AddNeighbor(EdgeType.Bottom, () => { return(Parent.GetChild(QuadType.BottomLeft)); });
AddNeighbor(EdgeType.Right, () => { return(Parent.GetChild(QuadType.TopRight)); });
// add non-siblings
AddNeighbor(EdgeType.Top, () =>
{
var pn = GetParentsNeighbor(EdgeType.Top);
if (pn != null)
{
var pnc = pn.GetChildren();
if (pnc != null && pnc.Any(c => c != null))
{
var pncs = pnc.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
return(pncs);
}
}
return(null);
});
AddNeighbor(EdgeType.Left, () =>
{
return(null); //GetParentsNeighbor(EdgeType.Left)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
});
break;
case QuadType.TopRight:
// add siblings
AddNeighbor(EdgeType.Bottom, () => { return(Parent.GetChild(QuadType.BottomRight)); });
AddNeighbor(EdgeType.Left, () => { return(Parent.GetChild(QuadType.TopLeft)); });
// add non-siblings
AddNeighbor(EdgeType.Top, () =>
{
return(null); //GetParentsNeighbor(EdgeType.Top)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
});
AddNeighbor(EdgeType.Right, () =>
{
return(null); //GetParentsNeighbor(EdgeType.Right)?.GetChildren()?.FirstOrDefault(c => c != null && HasAnySharedEdge(c));
});
break;
}
}
