/// <summary>
/// <para>Calculates the local coordinate system based on the position on the editor canvas.</para>
/// <para>Calculates a simple path for edges which contains the ids of the start and end nodes in the first path entry.</para>
/// </summary>
private static void DeriveGeomPositionOutOfPlacementIn(Component.FlNetElement _nwe, System.Windows.Point _offset, double _scale, out Matrix3D ucs, out List <Point3D> path)
{
ucs = Matrix3D.Identity;
path = new List <Point3D>();
if (_nwe == null)
{
return;
}
Point3D pivot = new Point3D(0, 0, 0);
System.Windows.Point offset = new System.Windows.Point(_offset.X * _scale, _offset.Y * _scale);
List <Vector3D> axes = new List <Vector3D>(); // x, y, z
if (_nwe is Component.FlNetNode)
{
Component.FlNetNode node = _nwe as Component.FlNetNode;
if (!(node.IsValid))
{
return;
}
pivot.X = node.Position.X * _scale + offset.X;
pivot.Z = node.Position.Y * _scale + offset.Y;
axes.Add(new Vector3D(1, 0, 0));
axes.Add(new Vector3D(0, 0, 1));
axes.Add(new Vector3D(0, 1, 0));
}
else if (_nwe is Component.FlNetEdge)
{
Component.FlNetEdge edge = _nwe as Component.FlNetEdge;
if (!(edge.IsValid))
{
return;
}
pivot.X = edge.Start.Position.X * _scale + offset.X;
pivot.Z = edge.Start.Position.Y * _scale + offset.Y;
// the first entry in the path saves the ids of the start and end nodes to
// communicate connectivity to the GeometryViewer
long start_id = edge.Start.ID;
long end_id = edge.End.ID;
if (edge.Start is Component.FlowNetwork)
{
Component.FlowNetwork nw_start = edge.Start as Component.FlowNetwork;
Component.FlNetNode nN = nw_start.SortAndGetLastNode();
if (nN != null)
{
start_id = nN.ID;
}
}
if (edge.End is Component.FlowNetwork)
{
Component.FlowNetwork nw_end = edge.End as Component.FlowNetwork;
Component.FlNetNode n1 = nw_end.SortAndGetFirstNode();
if (n1 != null)
{
end_id = n1.ID;
}
}
path.Add(new Point3D(start_id, end_id, -1));
path.Add(new Point3D(edge.Start.Position.X * _scale + offset.X, 0, edge.Start.Position.Y * _scale + offset.Y));
path.Add(new Point3D(edge.End.Position.X * _scale + offset.X, 0, edge.End.Position.Y * _scale + offset.Y));
Vector3D axis_x = path[1] - path[0];
axis_x.Normalize();
axes.Add(axis_x);
axes.Add(new Vector3D(0, 0, 1));
Vector3D axis_z = Vector3D.CrossProduct(axes[0], axes[1]);
axis_z.Normalize();
axes.Add(axis_z);
}
ucs = GeometricTransforms.PackUCS(pivot, axes[0], axes[1], axes[2]);
}
