Library

• Structure of DXF: http://www.autodesk.com/techpubs/autocad/acad2000/dxf/general_dxf_file_structure_dxf_aa.htm.

• A minimal DXF file with entities, example with a circle, top down: New "thing" (0) is a SECTION of type (2) ENTITIES (for all entities). Entity (0) CIRCLE with handle (5) 3F8 on layer (8) with coordinate sets (0), center x (10) 1.23, y (20) 4.56, z (30) 0.0, radius (40) 7.89, new (0) ENDSEC end of section, new (0) EOF, End Of File.

  0
SECTION
  2
ENTITIES
  0
CIRCLE
  5
3F8
  8
0
 10
1.23
 20
4.56
 30
0.0
 40
7.89
  0
ENDSEC
  0
EOF