topic I choose a center point of a circle but draw it's center in (0,0,0) in .NET Forum

I choose a center point of a circle but draw it's center in (0,0,0)

almutaz_86 — Fri, 09 Apr 2021 19:20:19 GMT

Good evening .

trying to write a code , drawing a circle after picking the center point ,

I choose a center point of a circle but draw it's center in (0,0,0)

using System; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.Runtime; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; [assembly: ExtensionApplication(typeof(GetPointTest2.test2))] namespace GetPointTest2 { public class test2:IExtensionApplication { [CommandMethod("test2")] public void t2() { Document doc = Application.DocumentManager.MdiActiveDocument; Database dbs = doc.Database; Editor editr = doc.Editor; Transaction trans = dbs.TransactionManager.StartTransaction(); ObjectId modspc = dbs.CurrentSpaceId; BlockTableRecord blkrec = trans.GetObject(modspc, OpenMode.ForWrite) as BlockTableRecord; try { PromptPointOptions ppo = new PromptPointOptions("\n Pick a point "); ppo.AllowArbitraryInput = false; ppo.AllowNone = true; PromptPointResult ppr1 = editr.GetPoint(ppo); if (ppr1.Status!=PromptStatus.OK) { return; } ppo.BasePoint = ppr1.Value; ppo.UseBasePoint = true; PromptPointResult ppr2 = editr.GetPoint(ppo); if (ppr2.Status!=PromptStatus.OK) { return; } Point3d cntr = new Point3d(ppo.BasePoint.X, ppo.BasePoint.Y, ppo.BasePoint.Z); Vector3d vect = new Vector3d(); double rad = 10; Circle circle = new Circle(cntr, vect, rad); blkrec.AppendEntity(circle); trans.AddNewlyCreatedDBObject(circle, true); } catch (Autodesk.AutoCAD.Runtime.Exception excep) { Application.ShowAlertDialog("" + excep ); } trans.Commit(); } void IExtensionApplication.Initialize() { } void IExtensionApplication.Terminate() { } } }

thanks 🙂

Re: I choose a center point of a circle but draw it's center in (0,0,0)

essam-salah — Fri, 09 Apr 2021 21:01:08 GMT

Hi @almutaz_86

why you ask for 2 points

try this

PromptPointOptions ppo = new PromptPointOptions("\n Pick a point "); ppo.AllowArbitraryInput = false; ppo.AllowNone = true; PromptPointResult ppr1 = editr.GetPoint(ppo); if (ppr1.Status!=PromptStatus.OK) { return; } Vector3d vect = new Vector3d(); double rad = 10; Circle circle = new Circle(ppr1.Value, vect, rad);

Re: I choose a center point of a circle but draw it's center in (0,0,0)

_gile — Fri, 09 Apr 2021 21:29:19 GMT

There are many things in your code that are not very clean or even wrong:

you must dispose of the transaction (the simplest way is to wrap it in a using statement)
passing a new Vector3d() (i.e., a null vector (0, 0, 0)) to the Circle constructor is certainly the cause of your error
you should not commit the transaction outside of the try block
you should not write useless code (as for a second point)
you should use a separated class to implement IExtensionApplication if you need this (unused here)

using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.Runtime; [assembly: CommandClass(typeof(GetPointTest2.Test2))] namespace GetPointTest2 { public class Test2 { [CommandMethod("TEST2")] public static void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; var ppr = ed.GetPoint("\n Pick a point "); if (ppr.Status != PromptStatus.OK) return; var center = ppr.Value; using (var tr = db.TransactionManager.StartTransaction()) { var circle = new Circle(center, Vector3d.ZAxis, 10.0); circle.TransformBy(ed.CurrentUserCoordinateSystem); var space = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite); space.AppendEntity(circle); tr.AddNewlyCreatedDBObject(circle, true); tr.Commit(); } } } }

Re: I choose a center point of a circle but draw it's center in (0,0,0)

almutaz_86 — Sat, 10 Apr 2021 03:36:31 GMT

Thank you @_gile for your important notes, there is some codeblocks I was think its necessary

I'm still in first step of .net api of AutoCAD

thank you again .

Re: I choose a center point of a circle but draw it's center in (0,0,0)

almutaz_86 — Sat, 10 Apr 2021 04:01:09 GMT

Thanks @essam-salah

I tried your way, But its not working.