Draw circle in the XY plane.

[Aravinth.Pichamani]

[prem_kumar8SXZJ]

Hi @Aravinth.Pichamani, Please provide more details on what you are trying to achieve then only we can help you with the problem.

[essam-salah]

hi @Aravinth.Pichamani 

      var center = new Autodesk.AutoCAD.Geometry.Point3d(3, 5, 5);
      var normal_XY_Plane = Autodesk.AutoCAD.Geometry.Vector3d.ZAxis;
      var normal_custom = new Autodesk.AutoCAD.Geometry.Vector3d(3, 4, 5);

      var radius = 10d;
      var circle = new Autodesk.AutoCAD.DatabaseServices.Circle(center, normal_XY_Plane, radius);

[Aravinth.Pichamani]

i need to draw a circle with new UCS 

[essam-salah]

hi@Aravinth.Pichamani 

have u tried any thing and failed, what is your problem exactly, the below pic shows the the vector v nad c1, c2 as line start/end points 

[Aravinth.Pichamani]

[Aravinth.Pichamani]

[cuongtk2]

The normal vector of a plane is a vector that is perpendicular to the plane and is commonly used to represent the orientation of the plane in three-dimensional space.
var circle = new Autodesk.AutoCAD.DatabaseServices.Circle(center, normal_custom, radius);

[Aravinth.Pichamani]

[Aravinth.Pichamani]

pls guide me

[essam-salah]

@Aravinth.Pichamani 

if the input is the Line (center line) why we do transformation?, just the vector of the CL and a point lies on that line,

and u can use editor.CurrentUserCoordinateSystem to get current user coord system.

anyway if u can provide us with the dwg file and draw the input in a specific layer and the output u want in another layer it might help

[Aravinth.Pichamani]

[essam-salah]

hi @Aravinth.Pichamani 

here is what i understood, and the way it worked for me:

using cDB = Autodesk.Civil.DatabaseServices;
using P3D = Autodesk.AutoCAD.Geometry.Point3d;
using aApp = Autodesk.AutoCAD.ApplicationServices;
...

 // get current doc and db
 var aDoc = aApp.Application.DocumentManager.MdiActiveDocument;
 var db = aDoc.Database;
 var ed = aDoc.Editor;

 // main start/end points (center line)
 var p1 = new P3D(5, 5, 5);   // random point
 var p2 = new P3D(30, 25, 8); // random point
 // distances on main line
 double d1 = 10d, d2 = 20d; // for points m1, m2

 // transaction
 using (var tr = db.TransactionManager.StartTransaction())
 {
   // get current model space 
   var bt = tr.GetObject(db.BlockTableId, aDB.OpenMode.ForWrite) as aDB.BlockTable;
   var btr = tr.GetObject(bt[aDB.BlockTableRecord.ModelSpace], aDB.OpenMode.ForWrite) as aDB.BlockTableRecord;

   // draw main line (CL):
   var cl = new aDB.Line(p1, p2);
   // main line vector:
   var v = p1.GetVectorTo(p2).GetNormal();
   // calc any point at CL (m1, m2):
   var v1 = v * d1;
   var v2 = v * d2;
   var m1 = new P3D(p1.X + v1.X, p1.Y + v1.Y, p1.Z + v2.Z);
   var m2 = new P3D(p1.X + v2.X, p1.Y + v2.Y, p1.Z + v2.Z);
   // draw circles
   var circle_1 = new aDB.Circle(p1, v, radius: 10);
   var circle_2 = new aDB.Circle(m1, v, radius: 12);
   var circle_3 = new aDB.Circle(m2, v, radius: 14);

   // add to current drawings
   btr.AppendEntity(cl);
   btr.AppendEntity(circle_1);
   btr.AppendEntity(circle_2);
   btr.AppendEntity(circle_3);
   tr.AddNewlyCreatedDBObject(cl, true);
   tr.AddNewlyCreatedDBObject(circle_1, true);
   tr.AddNewlyCreatedDBObject(circle_2, true);
   tr.AddNewlyCreatedDBObject(circle_3, true);

   // apply changes
   tr.Commit();
 }

[_gile]

Hi,

Here's an example you can use as inspiration.

[CommandMethod("DRAW3DCIRCLE")]
public static void Draw3dCircle()
{
    var doc = Application.DocumentManager.MdiActiveDocument;
    var db = doc.Database;
    var ed = doc.Editor;

    // Prompt the user for the circle center
    var ppo = new PromptPointOptions("\nSpecify the circle center: ");
    var ppr = ed.GetPoint(ppo);
    if (ppr.Status != PromptStatus.OK)
        return;
    var center = ppr.Value;

    // Prompt the user for a point in the circle normal direction
    ppo.Message = "\nSpecify a point in the circle normal direction: ";
    ppo.BasePoint = center;
    ppo.UseBasePoint = true;
    ppr = ed.GetPoint(ppo);
    if (ppr.Status != PromptStatus.OK)
        return;
    var normal = center.GetVectorTo(ppr.Value);

    // Prompt the user for the circle radius
    var pdo = new PromptDistanceOptions("\nSpecify the circle radius: ");
    pdo.BasePoint = center;
    pdo.UseBasePoint = true;
    var pdr = ed.GetDistance(pdo);
    if (pdr.Status != PromptStatus.OK)
        return;
    double radius = pdr.Value;

    using (var tr = db.TransactionManager.StartTransaction())
    {
        // Create a Circle instance from the user inputs
        // Both center and normal have to be transformed from current UCS to WCS
        var circle = new Circle(
            center.TransformBy(ed.CurrentUserCoordinateSystem),
            normal.TransformBy(ed.CurrentUserCoordinateSystem),
            radius);

        // Add the circle to the current space
        var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
        curSpace.AppendEntity(circle);
        tr.AddNewlyCreatedDBObject(circle, true);
        tr.Commit();
    }
}

[essam-salah]

hi @Aravinth.Pichamani 

have your problem solved?

[_gile · Accepted solution]

If you want to honor the current UCS as the CIRCLE native command does, you can simply transform the newly created circle with the Editor.CurrentCoordinateSystem matrix.

[CommandMethod("DRAWCIRCLEINUCS")]
public static void DrawCircleInUCS()
{
    var doc = Application.DocumentManager.MdiActiveDocument;
    var db = doc.Database;
    var ed = doc.Editor;

    // Prompt the user for the circle center
    var ppo = new PromptPointOptions("\nSpecify the circle center: ");
    var ppr = ed.GetPoint(ppo);
    if (ppr.Status != PromptStatus.OK)
        return;
    var center = ppr.Value;

    // Prompt the user for the circle radius
    var pdo = new PromptDistanceOptions("\nSpecify the circle radius: ");
    pdo.BasePoint = center;
    pdo.UseBasePoint = true;
    var pdr = ed.GetDistance(pdo);
    if (pdr.Status != PromptStatus.OK)
        return;
    double radius = pdr.Value;

    using (var tr = db.TransactionManager.StartTransaction())
    {
        // Create a Circle instance from the user inputs
        var circle = new Circle(center, Vector3d.ZAxis, radius);

        // Transform the circle froim WCS to UCS
        circle.TransformBy(ed.CurrentUserCoordinateSystem);

        // Add the circle to the current space
        var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
        curSpace.AppendEntity(circle);
        tr.AddNewlyCreatedDBObject(circle, true);
        tr.Commit();
    }
}