Interface to GNU LibreDWG, read and write DWG and DXF.

CDwgDocument

Methods:

.Open (filename)
.Save ([filename])
.SaveAs (filename], [version])
.Export filename, extension, [object]
  extension being a String with:
    .dxf, .eps, .svg, .sat, .bmp, .json, .geojson
  object required for bmp, sat
.Close

.AddOBJECT (specific args)
  for all supported entities and objects

Constants:
  R_12 - R_2018 i as version args for SaveAs

Collections:

Blocks
Dictionaries
DimStyles
Groups
Layers
Linetypes
ModelSpace
PaperSpace
PlotConfigurations
RegisteredApplications
TextStyles
UCSs
Viewports
Views
Header ??
Info => SummaryInfo

ModelSpace, PaperSpace and Block returning objects

CDxfDocument:
.Open (filename) => CDwgDocument