private void ProcessFeature(Feature feature, [CanBeNull] Polygon perimeter)
{
Polyline curve;
var shape = feature.GetShape();
if (shape is Polygon polygon)
{
var before = GetPointIDs(polygon); // TODO DEBUG DROP
curve = GeometryUtils.Boundary(polygon);
}
else if (shape is Polyline polyline)
{
var before = GetPointIDs(polyline); // TODO DEBUG DROP
curve = polyline;
}
else
{
curve = null;
Assert.Fail("Input shape is neither Polyline nor Polygon");
}
if (_simplificationTolerance > 0)
{
curve = GeometryUtils.Generalize(curve, _simplificationTolerance);
curve = GeometryUtils.Simplify(curve);
}
var builder = new PolylineBuilder(curve)
{
HasID = true
};
builder.SetEmpty();
int controlPointsAdded = 0;
int controlPointsRemoved = 0;
// Things to watch out:
// - preserve non-linear segments
// - process each part separately
// - remember Start/EndPoint or rings
foreach (var part in curve.Parts)
{
var numSegments = part.Count;
if (numSegments < 1)
{
continue;
}
bool startNewPart = true;
var one = part[0];
for (int i = 1; i < numSegments; i++)
{
var two = part[i];
var centerPoint = two.StartPoint;
if (ProcessingUtils.WithinPerimeter(centerPoint, perimeter))
{
DoVertex(ref one, ref two, ref controlPointsAdded, ref controlPointsRemoved);
}
builder.AddSegment(one, startNewPart);
startNewPart = false;
one = two;
}
// For polygons (closed rings), also look at Start/EndPoint
if (shape is Polygon)
{
var two = part[0];
var centerPoint = two.StartPoint;
if (ProcessingUtils.WithinPerimeter(centerPoint, perimeter))
{
DoVertex(ref one, ref two, ref controlPointsAdded, ref controlPointsRemoved);
}
}
builder.AddSegment(one, startNewPart);
}
if (controlPointsAdded > 0 || controlPointsRemoved > 0)
{
bool wantPolygon = shape is Polygon;
if (wantPolygon)
{
var polyline = builder.ToGeometry();
shape = PolygonBuilder.CreatePolygon(polyline);
}
else
{
shape = builder.ToGeometry();
}
var after = GetPointIDs((Multipart)shape);
feature.SetShape(shape);
feature.Store(); // TODO requires an edit session
_msg.DebugFormat("Feature {0}: {1} control points added",
ProcessingUtils.Format(feature), controlPointsAdded);
ControlPointsAdded += controlPointsAdded;
ControlPointsRemoved += controlPointsRemoved;
}
}