public Edge GetEdge(BendyLayer layer)
{
if (_from == null || _to == null)
{
return(null);
}
if (_edgeCache != null && _edgeCache.Graph == layer && _edgeCache.InScene)
{
return(_edgeCache);
}
var fromNode = layer.GetNode(_from.Value);
if (fromNode == null)
{
return(null);
}
var toNode = layer.GetNode(_to.Value);
if (toNode == null)
{
return(null);
}
return(_edgeCache = layer.GetEdge(fromNode, toNode));
}
public static void AnnotateNodes(BendyLayer layer, IList <AnnotatedNode> nodes)
{
for (var i = 0; i < nodes.Count; i++)
{
var here = layer?.GetNode(nodes[i].Position);
var tmp = nodes[i];
tmp.Position = here?.Position ?? nodes[i].Position;
tmp.Existing = here;
tmp.Up = here?.Up ?? nodes[i].Up;
nodes[i] = tmp;
}
for (var i = 0; i < nodes.Count; i++)
{
var a = nodes[i];
var tanHere = Vector3.Zero;
if (a.Existing != null)
{
tanHere = a.Existing.Tangent * a.Existing.Neighbors.Count();
}
if (i > 0 && (nodes[i - 1].Existing == null || a.Existing?.ConnectionTo(nodes[i - 1].Existing) == null))
{
var tP = Vector3.Normalize(nodes[i - 1].Position - a.Position);
if (tP.Dot(tanHere) < 0)
{
tP = -tP;
}
tanHere += tP;
}
// ReSharper disable once InvertIf
if (i + 1 < nodes.Count && (nodes[i + 1].Existing == null || a.Existing?.ConnectionTo(nodes[i + 1].Existing) == null))
{
var tP = Vector3.Normalize(nodes[i + 1].Position - a.Position);
if (tP.Dot(tanHere) < 0)
{
tP = -tP;
}
tanHere += tP;
}
a.Tangent = Vector3.Normalize(tanHere.LengthSquared() > 0 ? tanHere : Vector3.CalculatePerpendicularVector(nodes[i].Up));
nodes[i] = a;
}
}