public IDivider[] IncidentDividers()
{
List <IDivider> result = new List <IDivider>(4); // 4 is frequently the number in the result
foreach (IFeatureDependent fd in Dependents)
{
if (fd is LineFeature)
{
LineFeature line = (fd as LineFeature);
Topology t = line.Topology;
if (t != null)
{
// Could have a situation where BOTH start and end of the line end
// at the same point (e.g. a multisegment that loops back on itself).
bool sMatch = line.StartPoint.IsCoincident(this);
bool eMatch = line.EndPoint.IsCoincident(this);
if (sMatch)
{
IDivider d = t.FirstDivider;
if (!d.IsOverlap)
{
result.Add(d);
}
}
if (eMatch)
{
// The result could conceivably contain the divider already (case where a multi-segment
// closes on itself)
IDivider d = t.LastDivider;
if (!d.IsOverlap && !result.Contains(d))
{
result.Add(d);
}
}
if (!(sMatch || eMatch))
{
// Cover a situation where this point is referenced to a line that
// passes through (intersection).
Debug.Assert(t is SectionTopologyList);
SectionTopologyList sections = (t as SectionTopologyList);
sections.AddIncidentDividers(result, this);
}
}
}
}
return(result.ToArray());
}
/// <summary>
/// Creates a new <c>Selection</c> that contains a single item (or nothing).
/// </summary>
/// <param name="so">The object to remember as part of this selection (if null, it
/// will not be added to the selection)</param>
/// <param name="searchPosition">A position associated with the selection (null
/// if a specific position isn't relevant). This is used to determine whether a
/// topological section is relevant when a line is selected.</param>
public Selection(ISpatialObject so, IPosition searchPosition)
{
m_Items = new List<ISpatialObject>(1);
if (so!=null)
m_Items.Add(so);
// If we're dealing with a single line that's been topologically sectioned,
// determine which divider we're closest to.
m_Section = null;
if (searchPosition != null)
{
LineFeature line = (so as LineFeature);
if (line != null && line.Topology is SectionTopologyList)
{
SectionTopologyList sections = (line.Topology as SectionTopologyList);
IDivider d = sections.FindClosestSection(searchPosition);
if (d != null)
m_Section = new DividerObject(d);
}
}
}
