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DXF is a graphics format used by Autodesk AutoCad

[edit] Overview

Drawing eXchange Format is a CAD data file format developed by Autodesk to allow data interoperability between AutoCAD and other programs.

[edit] Format

ASCII versions of DXF can be read with a text-editor. The basic organization of a DXF file is as follows:

  • HEADER section – General information about the drawing. Each parameter has a variable name and an associated value.
  • CLASSES section – Holds the information for application-defined classes whose instances appear in the BLOCKS, ENTITIES, and OBJECTS sections of the database. Generally does not provide sufficient information to allow interoperability with other programs.
  • TABLES section – This section contains definitions of named items.
    • Application ID (APPID) table
    • Block Record (BLOCK_RECORD) table
    • Dimension Style (DIMSTYPE) table
    • Layer (LAYER) table
    • Linetype (LTYPE) table
    • Text style (STYLE) table
    • User Coordinate System (UCS) table
    • View (VIEW) table
    • Viewport configuration (VPORT) table
  • BLOCKS section – This section contains Block Definition entities describing the entities comprising each Block in the drawing.
  • ENTITIES section – This section contains the drawing entities, including any Block References.
  • OBJECTS section – Contains the data that apply to nongraphical objects, used by AutoLISP and ObjectARX applications.
  • THUMBNAILIMAGE section – Contains the preview image for the DXF file.

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