/// <summary>
/// Creates line sections along this face.
/// </summary>
/// <param name="parentLine">The line that is being subdivided</param>
/// <param name="ff">Factory for producing new features (the important thing
/// is the editing operation that's involved).</param>
/// <param name="isTopological">Should the sections be tagged as polygon boundaries?</param>
internal void CreateSections(LineFeature parentLine, FeatureFactory ff, bool isTopological)
{
// Must have at least two distances
if (m_Distances == null)
{
throw new ArgumentNullException();
}
if (m_Distances.Length < 2)
{
throw new ArgumentException();
}
m_Sections = new List <LineFeature>(m_Distances.Length);
PointFeature start = parentLine.StartPoint;
InternalIdValue item = new InternalIdValue(ff.Creator.EditSequence);
for (int i = 0; i < m_Distances.Length; i++)
{
PointFeature end;
if (i == m_Distances.Length - 1)
{
end = parentLine.EndPoint;
}
else
{
item.ItemSequence++;
end = ff.CreatePointFeature(item.ToString());
}
item.ItemSequence++;
LineFeature line = ff.CreateSection(item.ToString(), parentLine, start, end);
line.ObservedLength = m_Distances[i];
if (!isTopological)
{
line.SetTopology(false);
}
m_Sections.Add(line);
start = end;
}
}
/// <summary>
/// Creates spatial features (points and lines) for this face. The created
/// features don't have any geometry.
/// </summary>
/// <param name="ff">The factory for creating new spatial features</param>
/// <param name="startPoint">The point (if any) at the start of this leg. May be
/// null in a situation where the preceding leg ended with an "omit point" directive.</param>
/// <param name="lastPoint">The point that should be used for the very end
/// of the leg (specify null if a point should be created at the end of the leg).</param>
internal void CreateFeatures(FeatureFactory ff, PointFeature startPoint, PointFeature lastPoint)
{
PointFeature from = startPoint;
PointFeature to = null;
// The initial item sequence relates to the face itself. The first feature along the face will
// have a sequence number one higher.
uint maxSequence = this.Sequence.ItemSequence;
int nSpan = m_Spans.Length;
for (int i = 0; i < nSpan; i++, from = to)
{
SpanInfo span = GetSpanData(i);
// If we have an end point, add it (so long as this span is not
// at the very end of the connection path).
to = null;
maxSequence++;
if (span.HasEndPoint)
{
if (i == (nSpan - 1))
{
to = lastPoint;
}
if (to == null)
{
to = ff.CreatePointFeature(maxSequence.ToString());
}
Debug.Assert(to != null);
}
// A line can only exist if both end points are defined (the "omit point"
// directive may well be used to finish a leg without a point, so the first
// span in the next leg can't have a line).
maxSequence++;
if (span.HasLine && from != null)
{
LineFeature line = this.Leg.CreateLine(ff, maxSequence.ToString(), from, to);
line.ObservedLength = span.ObservedDistance;
// Alternate faces should by non-topological. And mark as "void" so that it can be
// skipped on export to AutoCad.
if (FaceNumber == 2)
{
line.SetTopology(false); // should probably be false already
line.IsVoid = true;
}
span.CreatedFeature = line;
}
else
{
span.CreatedFeature = to;
}
}
}