AppendMPolygonLoop: Error: eAmbiguousInput

[tamara]

Hello, 

I am reading feature geomety from sdf file and converting it to ACAD geometry. 

I am having trouble to append polygon loop on a MPolygon object in many cases (function AppendMPolygonLoop()) , and i keep getting the eAmbiguousInput error, but I found nothnig on this on the net. This is my sample code:

 public static MPolygon ConvertFeatureToMPolygon(OSGeo.FDO.Geometry.IGeometry geometry, Style style, ref bool error)
        {
            MPolygon mPolygon = null;
            Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
            Database db = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database;

            try
            {
                mPolygon = new MPolygon();
                MPolygonLoopCollection mPolygonLoopColl = new MPolygonLoopCollection();
                MPolygonLoop mpolygonExteriorLoop = new MPolygonLoop();
                var polygonGeometry = geometry as OSGeo.FDO.Geometry.IPolygon;
                var exteriorRing = polygonGeometry.ExteriorRing;
                for (int i = 0; i < exteriorRing.Count; i++)
                {
                    var position = exteriorRing[i];
                    mpolygonExteriorLoop.Add(new BulgeVertex(new Point2d(position.X, position.Y), 0));
                }
                mPolygonLoopColl.Add(mpolygonExteriorLoop);

                int numOfInnerLoops = polygonGeometry.InteriorRingCount;
                for (int i = 0; i < numOfInnerLoops; i++)
                {
                    MPolygonLoop mPolygonInnerLoop = new MPolygonLoop();
                    var innerRing = polygonGeometry.GetInteriorRing(i);
                    for (int j = 0; j < innerRing.Count; j++)
                    {
                        var position = innerRing[j];
                        mPolygonInnerLoop.Add(new BulgeVertex(new Point2d(position.X, position.Y), 0));
                    }
                    mPolygonLoopColl.Add(mPolygonInnerLoop);
                }
                foreach (MPolygonLoop loop in mPolygonLoopColl)
                {
                    mPolygon.AppendMPolygonLoop(loop, true, 0.02);
                }

                try
                {
                    mPolygon.Layer = style.Layer.Name;
                }
                catch
                {
                    ACGHelperMethods.CreateLayer(style.Layer);
                    mPolygon.Layer = style.Layer.Name;
                }

                Pattern pattern = style.Pattern;
                if (pattern != null)
                {
                    mPolygon.SetPattern(HatchPatternType.PreDefined, pattern.Name);
                    if (pattern.Color.Index != 0)
                    {
                        mPolygon.PatternColor = Autodesk.AutoCAD.Colors.Color.FromColorIndex(ColorMethod.ByAci, pattern.Color.Index);

                    }
                    else
                    {
                        mPolygon.PatternColor = Autodesk.AutoCAD.Colors.Color.FromRgb((byte)pattern.Color.Red, (byte)pattern.Color.Green, (byte)pattern.Color.Blue);
                    }

                    if (pattern.Angle != 0)
                    {
                        mPolygon.PatternAngle = pattern.Angle;
                    }
                    if (pattern.Scale != 0)
                    {
                        mPolygon.PatternScale = pattern.Scale;
                    }
                    if (pattern.Space != 0)
                    {
                        mPolygon.PatternSpace = pattern.Space;
                    }
                }

                mPolygon.BalanceTree();
            }
            catch
            {
                mPolygon = null;
                error = true;
                return mPolygon;
            }
            return mPolygon;
        }

[fieldguy]

Are you able to create this mpolygon in Map using acad tools (command "mpolygon")?  If yes, create 1, explode it, and check if acad changed the direction on 1 of the polylines.

I would try adding the interior loop in the opposite direction.  IIRC the definition of polygons with islands is controlled by direction.  Exterior is clockwise, interior is counter-clockwise (kind of guessing here - it's been awhile). 

[tamara · Accepted solution]

Actually, I just needed to set 

mPolygon.AppendMPolygonLoop(loop, true, 0.00);

to 

mPolygon.AppendMPolygonLoop(loop, false, 0.00);

so that crossing loops don't get excluded. Turns out that I had many features in the database with crossing loops, so that was the problem I overlooked.

[fieldguy]

I'm glad you were able to solve it.  I saw your post in the Map 3D forum.  IMO you will never get a response from Autodesk on Map 3D procedures.  You will have better luck in the OSGEO forums.  I believe the future of Map is there - not here.