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Ellipse.md

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Ellipse Class

Overview

The Ellipse class represents an elliptical shape in AutoCAD, defined by a center point, major and minor axes.

Namespace

Autodesk.AutoCAD.DatabaseServices

Inheritance Hierarchy

System.Object
  └─ RXObject
      └─ DBObject
          └─ Entity
              └─ Curve
                  └─ Ellipse

Key Properties

Property Type Description
Center Point3d Gets/sets the center point
MajorAxis Vector3d Gets/sets the major axis vector
MinorAxis Vector3d Gets the minor axis vector (read-only)
MajorRadius double Gets/sets the major radius
MinorRadius double Gets/sets the minor radius
RadiusRatio double Gets/sets the ratio of minor to major radius
StartAngle double Gets/sets the start angle (for elliptical arcs)
EndAngle double Gets/sets the end angle (for elliptical arcs)
Normal Vector3d Gets/sets the normal vector

Code Examples

Example 1: Creating an Ellipse

using (Transaction tr = db.TransactionManager.StartTransaction())
{
    BlockTableRecord btr = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
    
    Point3d center = new Point3d(100, 100, 0);
    Vector3d majorAxis = new Vector3d(50, 0, 0); // 50 units in X direction
    Vector3d normal = Vector3d.ZAxis;
    double radiusRatio = 0.5; // Minor radius is half of major
    
    Ellipse ellipse = new Ellipse(center, normal, majorAxis, radiusRatio, 0, 2 * Math.PI);
    
    btr.AppendEntity(ellipse);
    tr.AddNewlyCreatedDBObject(ellipse, true);
    
    tr.Commit();
}

Example 2: Creating an Elliptical Arc

using (Transaction tr = db.TransactionManager.StartTransaction())
{
    BlockTableRecord btr = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
    
    Point3d center = new Point3d(200, 200, 0);
    Vector3d majorAxis = new Vector3d(40, 0, 0);
    Vector3d normal = Vector3d.ZAxis;
    double radiusRatio = 0.6;
    double startAngle = 0;
    double endAngle = Math.PI; // Half ellipse
    
    Ellipse ellipseArc = new Ellipse(center, normal, majorAxis, radiusRatio, startAngle, endAngle);
    
    btr.AppendEntity(ellipseArc);
    tr.AddNewlyCreatedDBObject(ellipseArc, true);
    
    tr.Commit();
}

Related Objects

  • Circle - Special case where radiusRatio = 1
  • Arc - Circular arc
  • Curve - Base class

References