The following group codes apply to ellipse entities.
Ellipse group codes
Group code
Description
100
Subclass marker (AcDbEllipse)
10
Center point (in WCS)
DXF: X value; APP: 3D point
20, 30
DXF: Y and Z values of center point (in WCS)
11
Endpoint of major axis, relative to the center (in WCS)
21, 31
DXF: Y and Z values of endpoint of major axis, relative to the center (in WCS)
210
Extrusion direction (optional; default = 0, 0, 1)
DXF: X value; APP: 3D vector
220, 230
DXF: Y and Z values of extrusion direction (optional)
40
Ratio of minor axis to major axis
41
Start parameter (this value is 0.0 for a full ellipse)
42
End parameter (this value is 2pi for a full ellipse)