private string GetErrorMessage([NotNull] MMonotonicitySequence sequence)
{
var sb = new StringBuilder();
string segmentInfo = sequence.SegmentCount == 1
? "one segment"
: string.Format("{0} segments", sequence.SegmentCount);
sb.AppendFormat("M values are {0} for {1}",
GetMonotonicityTypeString(sequence.MonotonicityType,
sequence.FeatureIsFlipped),
segmentInfo);
if (sequence.MonotonicityType == esriMonotinicityEnum.esriValueDecreases ||
sequence.MonotonicityType == esriMonotinicityEnum.esriValueIncreases)
{
sb.AppendFormat(". {0}",
GetExpectedMonotonicityString(sequence,
_expectedMonotonicity));
if (sequence.FeatureIsFlipped != null &&
sequence.FeatureIsFlipped.Value)
{
sb.Append(" (against the feature orientation)");
}
}
return(sb.ToString());
}
private static string GetExpectedMonotonicityString(
[NotNull] MMonotonicitySequence sequence,
MonotonicityDirection expectedMonotonicity)
{
switch (expectedMonotonicity)
{
case MonotonicityDirection.Decreasing:
return("The M values should be decreasing");
case MonotonicityDirection.Increasing:
return("The M values should be increasing");
case MonotonicityDirection.Any:
return(string.Format("The M value trend for the line is {0}",
GetMonotonicityTypeString(
sequence.FeatureMonotonicityTrend,
sequence.FeatureIsFlipped)));
default:
throw new ArgumentException(
string.Format("Unexpected monotonicity direction: {0}",
expectedMonotonicity));
}
}
public static IEnumerable <MMonotonicitySequence> GetMonotonicitySequences(
[NotNull] ISegmentCollection segments,
[NotNull] IEnumerable <esriMonotinicityEnum> monotonicityTypes)
{
MMonotonicitySequence currentSequence = null;
var types = new HashSet <esriMonotinicityEnum>(monotonicityTypes);
if (types.Count == 0)
{
yield break;
}
IEnumSegment enumSegments = segments.EnumSegments;
enumSegments.Reset();
ISegment segment;
var partIndex = 0;
var segmentIndex = 0;
enumSegments.Next(out segment, ref partIndex, ref segmentIndex);
bool recycling = enumSegments.IsRecycling;
while (segment != null)
{
esriMonotinicityEnum currentMonotonicity = GetMonotonicityType(segment);
if (types.Contains(currentMonotonicity))
{
if (currentSequence == null)
{
currentSequence = new MMonotonicitySequence(currentMonotonicity,
segment.SpatialReference);
}
if (currentSequence.MonotonicityType != currentMonotonicity)
{
yield return(currentSequence);
currentSequence = new MMonotonicitySequence(currentMonotonicity,
segment.SpatialReference);
}
currentSequence.Add(recycling
? GeometryFactory.Clone(segment)
: segment);
}
else
{
if (currentSequence != null)
{
yield return(currentSequence);
currentSequence = null;
}
}
if (recycling)
{
Marshal.ReleaseComObject(segment);
}
enumSegments.Next(out segment, ref partIndex, ref segmentIndex);
}
if (currentSequence != null)
{
yield return(currentSequence);
}
}