The following group codes apply to line entities.
Line group codes
Group code
Description
100
Subclass marker (AcDbLine)
39
Thickness (optional; default = 0)
10
Start point (in WCS)
DXF: X value; APP: 3D point
20, 30
DXF: Y and Z values of start point (in WCS)
11
Endpoint (in WCS)
21, 31
DXF: Y and Z values of endpoint (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)