topic Re: Hatch does not work in .NET Forum

Hatch does not work

wesbird — Mon, 08 May 2023 16:57:53 GMT

hi:

I have code to hatch 100+ LWPOLYLINE, for some reason, some of them not working. I check the code, I got error message of

eInvalidInput

at line of

oHatch.AppendLoop(HatchLoopTypes.Default, ObjIds);

I already tried HatchLoopTypes.External, same result.

for testing, I create a function: pick the pline, then call the function, got the same error.

if I manually pick the same pline, use AutoCAD HATCH command, it works.

what's could be wrong?

I really appreciate your help.

private static Entity DrawHatch(Entity ent, Color color) { string HatchPattern = "SOLID"; Transparency HatchTransparency = new Transparency(255); ObjectIdCollection ObjIds = new ObjectIdCollection(); ObjIds.Add(ent.ObjectId); try { ent.UpgradeOpen(); Hatch oHatch = new Hatch(); oHatch.SetDatabaseDefaults(); oHatch.SetHatchPattern(HatchPatternType.PreDefined, HatchPattern); // color oHatch.Color = color; // transparency oHatch.Transparency = HatchTransparency; // Outermost oHatch.AppendLoop(HatchLoopTypes.Default, ObjIds); // evaluate hatch oHatch.EvaluateHatch(true); return oHatch; } catch (Exception caught) { BPLog.Fatal($"ent={ent.Handle}", caught); return null; } }

Re: Hatch does not work

hng_kaijianG7MAN — Tue, 09 May 2023 01:39:17 GMT

@wesbird

Hi there, you need to append to block table record before editing the properties of the hatch.

Please refer: Solved: AutoCAD .NET - Creating hatch from polyline - Autodesk Community - AutoCAD

Re: Hatch does not work

wesbird — Tue, 09 May 2023 12:06:54 GMT

Thank you, @hng_kaijianG7MAN,

Sorry, my code is not complete. I do have code for appending to block table record

also, I tested with this code from gile. still the same error.

I just don't understand, why the same code work for some pline but not the other, why the same pline code not working but HATCH command works.

and the test pline with problem does not have issue like open, self intersect.

here code from gile

[CommandMethod("JGC.UI.Test", nameof(JGCTest_Hatch2), CommandFlags.Modal)] public static void JGCTest_Hatch2() { var oid = JTISelect.GetEntityX<Polyline>("\nPick a polyline:", ""); if (oid.IsNull) { return; } HatchPolyLine(oid); } public static void HatchPolyLine(ObjectId plineId) { try { if (plineId.IsNull) throw new ArgumentNullException("plineId"); if (plineId.ObjectClass != RXObject.GetClass(typeof(Polyline))) throw new Autodesk.AutoCAD.Runtime.Exception(ErrorStatus.IllegalEntityType); var ids = new ObjectIdCollection(); ids.Add(plineId); using (var tr = plineId.Database.TransactionManager.StartTransaction()) { var pline = (Polyline)tr.GetObject(plineId, OpenMode.ForWrite); if (!(pline.Closed || pline.GetPoint2dAt(0).IsEqualTo(pline.GetPoint2dAt(pline.NumberOfVertices - 1)))) throw new InvalidOperationException("Opened polyline."); var owner = (BlockTableRecord)tr.GetObject(pline.OwnerId, OpenMode.ForWrite); var hatch = new Hatch(); hatch.SetHatchPattern(HatchPatternType.PreDefined, "SOLID"); owner.AppendEntity(hatch); tr.AddNewlyCreatedDBObject(hatch, true); hatch.Associative = true; hatch.AppendLoop(HatchLoopTypes.Default, ids); hatch.EvaluateHatch(true); tr.Commit(); } } catch (System.Exception ex) { var ed = Application.DocumentManager.MdiActiveDocument.Editor; ed.WriteMessage($"{ex.Message}\n{ex.StackTrace}"); } }

Re: Hatch does not work

_gile — Tue, 09 May 2023 12:19:45 GMT

Hi,

Is the selected pline correctly closed?

Re: Hatch does not work

wesbird — Thu, 11 May 2023 12:43:39 GMT

Thank you, gile,

Yes, it's closed. and HATCH command works just fine.

Re: Hatch does not work

shubhamraut221195 — Thu, 18 May 2023 05:16:52 GMT

Most probably your entity is not closed entity. if you draw circle and fill it with hatch it won't show such error but if you do the same with line, it will cause eInvalidInput error at AppendLoop()