How to create elliptical arc with two points and center point.

[MarkJamesRogolino]

Hello, everyone. Now I wanna make a semi/quarter ellipse like following images, Hope to someone help me.

Ellipse should be lied crookedly. And I know 2 points of this ellipse. Thanks in advance.

[hosneyalaa]

Can you attached example drawing 

[MarkJamesRogolino]

okay, you can find LEGENDS : table in this drawing.

[hosneyalaa]

@MarkJamesRogolino 

SEE THIS

TRY

[CommandMethod("TEST")]
        public void Test()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            

            using (var tr = db.TransactionManager.StartTransaction())
            {
                var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);

                Point3d cen = new Point3d(5156273.51 , -1187659.62 , 0 );

                Vector3d nor = Vector3d.ZAxis;

                Vector3d mAxis = new Vector3d(0.47 , -0.363 , 0);

                double rRatio = 0.2670;

                double stAng = -.66253;

                double enAng = 0.357;



                Ellipse ellipse = new Ellipse(cen, nor, mAxis, rRatio, stAng, enAng);

                curSpace.AppendEntity(ellipse);
                tr.AddNewlyCreatedDBObject(ellipse, true);

                tr.Commit();
            }
        }

[MarkJamesRogolino]

Thank you for your help. But can you find to make two ends of ellipse coincides to blue mark points?

 

[MarkJamesRogolino]

I don't know meaning of mAxis(third parameter). Could you tell me ? Thank you again.

[hosneyalaa]

Really I know a lot about ellipse

You can see this

https://help.autodesk.com/view/OARX/2022/ENU/?guid=OARX-ManagedRefGuide-Autodesk_AutoCAD_Geometry_El... 

It is possible if @_gile  has the time to help you and he has sufficient experience