public IPolyline GetSubpart(int startSegmentIndex, double startFraction,
int endSegmentIndex, double endFraction)
{
IPointCollection4 subpart = new PolylineClass();
((IZAware)subpart).ZAware = true;
var add = 2;
if (endFraction == 0)
{
add = 1;
}
int pointCount = endSegmentIndex - startSegmentIndex + add;
var points = new WKSPointZ[pointCount];
SegmentProxy seg0 = GetSegment(startSegmentIndex);
IPnt p = seg0.GetPointAt(startFraction, true);
points[0] = QaGeometryUtils.GetWksPoint(p);
for (int i = startSegmentIndex + 1; i <= endSegmentIndex; i++)
{
points[i - startSegmentIndex] = GetPlanePoint(i);
}
if (endFraction > 0)
{
SegmentProxy seg1 = GetSegment(endSegmentIndex);
IPnt end = seg1.GetPointAt(endFraction, true);
points[pointCount - 1] = QaGeometryUtils.GetWksPoint(end);
}
GeometryUtils.SetWKSPointZs(subpart, points);
return((IPolyline)subpart);
}
private IPolyline GetLinearSubpart(int startSegmentIndex, double startFraction,
int endSegmentIndex, double endFraction)
{
IPointCollection4 subpart = new PolylineClass();
int add = 2;
if (endFraction == 0)
{
add = 1;
}
int pointCount = endSegmentIndex - startSegmentIndex + add;
var points = new WKSPointZ[pointCount];
SegmentProxy seg0 = GetSegment(startSegmentIndex);
IPnt p = seg0.GetPointAt(startFraction, as3D: true);
points[0] = QaGeometryUtils.GetWksPoint(p);
for (int i = startSegmentIndex + 1; i <= endSegmentIndex; i++)
{
points[i - startSegmentIndex] = _points[i];
}
if (endFraction > 0)
{
SegmentProxy seg1 = GetSegment(endSegmentIndex);
IPnt end = seg1.GetPointAt(endFraction, as3D: true);
points[pointCount - 1] = QaGeometryUtils.GetWksPoint(end);
}
GeometryUtils.SetWKSPointZs(subpart, points);
((IPolyline)subpart).SpatialReference = SpatialReference;
return((IPolyline)subpart);
}
