topic Re: How to break a curve in a blockreference? in .NET Forum

How to break a curve in a blockreference?

swaywood — Wed, 18 Mar 2020 06:09:16 GMT

Hi,

I konw there is a method GetSplitCurves.

DBObjectCollection tmpSplittedCurves = curvLine.GetSplitCurves(pts);

Use this can split a curve into several picies curves.

but i do not know how to split curves in a blockreference.

thanks

Re: How to break a curve in a blockreference?

_gile — Wed, 18 Mar 2020 09:18:20 GMT

Hi,

You cannot edit entities in a BlockReference, you can only do it in its BlockTableRecord and the changes will affect all inserted references.

Re: How to break a curve in a blockreference?

swaywood — Thu, 19 Mar 2020 01:10:35 GMT

Hi Gile,

Thank you for your reply.

Yes , I had make a mistake.

I wanna edit the blocktablerecord, and it will effect its copies(blockreference).

But, I do not know how to edit a blocktablerecord.

Could you give me some code for spliting a curve into several pieces in a blockrecord?

Re: How to break a curve in a blockreference?

swaywood — Thu, 19 Mar 2020 01:13:54 GMT

please see the attached pics.

Re: How to break a curve in a blockreference?

_gile — Thu, 19 Mar 2020 07:09:38 GMT

Assuming the user have to specify the break points, why not doing it with native commands as _BEDIT or _REFEDIT ?

Re: How to break a curve in a blockreference?

_gile — Thu, 19 Mar 2020 12:18:21 GMT

Anyway, here's an example.

using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.Runtime; using AcAp = Autodesk.AutoCAD.ApplicationServices.Core.Application; namespace BreakCurveInBlockSample { public class Commands { [CommandMethod("NESTEDBREAK")] public static void BreakCurveInBlock() { var doc = AcAp.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; using (var tr = db.TransactionManager.StartTransaction()) { PromptNestedEntityResult pner; while (true) { pner = ed.GetNestedEntity("\nSelect curve in block: "); if (pner.Status != PromptStatus.OK) return; if (!pner.ObjectId.ObjectClass.IsDerivedFrom(RXObject.GetClass(typeof(Curve)))) ed.WriteMessage("\nSelected object is not a curve."); else if (pner.GetContainers().Length == 0) ed.WriteMessage("\nSelected curve is not nested."); else break; } var curve = (Curve)tr.GetObject(pner.ObjectId, OpenMode.ForWrite); var xform = pner.Transform.Inverse() * ed.CurrentUserCoordinateSystem; bool tryGetPointonCurve(string message, out Point3d point) { var ppr = ed.GetPoint($"\n{message}"); if (ppr.Status != PromptStatus.OK) { point = Point3d.Origin; return false; } var pt = ppr.Value.TransformBy(xform); using (var view = ed.GetCurrentView()) { point = curve.GetClosestPointTo(pt, view.ViewDirection, false); } return true; } if (!tryGetPointonCurve("\nSpecify first point: ", out Point3d pt1)) return; if (!tryGetPointonCurve("\nSpecify second point: ", out Point3d pt2)) return; if (!tryGetPointonCurve("\nSpecify a point on the part to delete: ", out Point3d pt3)) return; var points = new Point3dCollection(); if (curve.GetParameterAtPoint(pt1) < curve.GetParameterAtPoint(pt2)) { points.Add(pt1); points.Add(pt2); } else { points.Add(pt2); points.Add(pt1); } var btr = (BlockTableRecord)tr.GetObject(curve.OwnerId, OpenMode.ForWrite); var curves = curve.GetSplitCurves(points); foreach (Curve c in curves) { if (c.GetClosestPointTo(pt3, false).IsEqualTo(pt3)) { c.Dispose(); } else { btr.AppendEntity(c); tr.AddNewlyCreatedDBObject(c, true); } } curve.Erase(); tr.Commit(); } ed.Regen(); } } }

Re: How to break a curve in a blockreference?

swaywood — Fri, 20 Mar 2020 00:46:52 GMT

Hi, Gile:

because this way is more easier for user.

Re: How to break a curve in a blockreference?

swaywood — Fri, 20 Mar 2020 00:59:09 GMT

Gile:

thank you for your kindly help.

in your code, there are 4 steps,

step 1 is select curve, step 4 is select son curve need be deleted.

is there any way to cancel step 1 through step 4?

because step 4 curve is the same curve before split.

but i do not know how to transform the pt3,

and then use

public Point3d NonInteractivePickPoint { get; set; }
public bool UseNonInteractivePickPoint { get; set; }

of PromptNestedEntityOptions

to get the nested curve.

please help me, thanks

Re: How to break a curve in a blockreference?

_gile — Fri, 20 Mar 2020 06:13:37 GMT

[CommandMethod("NESTEDBREAK")] public static void BreakCurveInBlock() { var doc = AcAp.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; using (var tr = db.TransactionManager.StartTransaction()) { PromptNestedEntityResult pner; while (true) { pner = ed.GetNestedEntity("\nSelect curve in block (on the part to remove): "); if (pner.Status != PromptStatus.OK) return; if (!pner.ObjectId.ObjectClass.IsDerivedFrom(RXObject.GetClass(typeof(Curve)))) ed.WriteMessage("\nSelected object is not a curve."); else if (pner.GetContainers().Length == 0) ed.WriteMessage("\nSelected curve is not nested."); else break; } var curve = (Curve)tr.GetObject(pner.ObjectId, OpenMode.ForWrite); var xform = pner.Transform.Inverse() * ed.CurrentUserCoordinateSystem; var pt3 = pner.PickedPoint.TransformBy(xform); using (var view = ed.GetCurrentView()) { pt3 = curve.GetClosestPointTo(pt3, view.ViewDirection, false); } bool tryGetPointonCurve(string message, out Point3d point) { var ppr = ed.GetPoint($"\n{message}"); if (ppr.Status != PromptStatus.OK) { point = Point3d.Origin; return false; } var pt = ppr.Value.TransformBy(xform); using (var view = ed.GetCurrentView()) { point = curve.GetClosestPointTo(pt, view.ViewDirection, false); } return true; } if (!tryGetPointonCurve("\nSpecify first point: ", out Point3d pt1)) return; if (!tryGetPointonCurve("\nSpecify second point: ", out Point3d pt2)) return; var points = new Point3dCollection(); if (curve.GetParameterAtPoint(pt1) < curve.GetParameterAtPoint(pt2)) { points.Add(pt1); points.Add(pt2); } else { points.Add(pt2); points.Add(pt1); } var btr = (BlockTableRecord)tr.GetObject(curve.OwnerId, OpenMode.ForWrite); var curves = curve.GetSplitCurves(points); foreach (Curve c in curves) { if (c.GetClosestPointTo(pt3, false).IsEqualTo(pt3)) { c.Dispose(); } else { btr.AppendEntity(c); tr.AddNewlyCreatedDBObject(c, true); } } curve.Erase(); tr.Commit(); } ed.Regen(); }

I find it strange that you have so many blocks to modify this way, so much that you need a program.

Re: How to break a curve in a blockreference?

swaywood — Fri, 20 Mar 2020 06:26:39 GMT

Hi, Gile:

Many users are not familiar with editing a block reference.

Especially the block with attributes.

In this case, they usually try to break up the block references.

And that's not what I want, because there's a lot of XDATA in the block.

That's why I need a program.

could you tell me how to select the curve in blockreference by pt3 selently.

thanks.

Re: How to break a curve in a blockreference?

_gile — Fri, 20 Mar 2020 06:38:22 GMT

In my last attempt, the pt3 is got from the curve selection (PickedPoint) and it is the simplest way to get it. So there're only 3 inputs.

If you absolutely need to do it in the reverse way (pick a point and get the entity with NonInteractivePickPoint), you need to set the NonInteractivePickPoint with pt3, and check the result of PromptNestedEntityResult.

I have no time to this right now, but you should be able to do it by yourself.

Re: How to break a curve in a blockreference?

swaywood — Sat, 21 Mar 2020 07:51:34 GMT

Hi,Gile:

I Had finished the program,

and known how to edit a entity in a blocktablerecord.

Thanks so much.