DXF File Format Presentation

DXF file formatPRESENTED BY: MAHA MOSTAFA ELZIADY

MAHMOUD SALAH ELDIN MOHAMED HASHEM

PRESENTED TO : DR. MOHAMED AWAD

SRMANF

Content

Neutral data files

Neutral data files examples

DXF file

DXF structure

Example

Neutral Data Files

Neutral data files and neutral file interfaces are needed in order to exchange product data between CAD systems

Neutral data file

Neutral Data Files Examples

DXF IGES STEP PDES VDAIS VDAFS

DXF file

AutoCAD DXF (Drawing Interchange Format, or Drawing Exchange Format). DXF was originally introduced in December 1982 as part of AutoCAD 1.0, and was intended to provide an exact representation of the data in the AutoCAD native file format

DXF Structure

Header Classes Tables Blocks Entities Objects End of file

HEADER

General information about the drawing. Each parameter has a variable name and an associated value.

CLASSES

Holds the description of any application-defined classes of objects that may be instantiated in the BLOCKS or ENTITIES sections.

TABLES

Contains several lists of information used in the rest of the drawing, such as the list of line types, layer names, fonts, and preset views of the drawing

BLOCKS

Contains predefined drawing elements that might be present in the drawing. For example, a block could define a standard door knob that is placed on every door in a drawing. Block definitions are referenced in the ENTITIES section with the INSERT command

ENTITIES

Contains the actual object data of the drawing. This can include raw data such as LINE and ARC entities as well as INSERT commands that place a predefined block definition at a certain position in the drawing.

OBJECTS

Contains non-graphical parts of the drawing. All entities that are not part of the entities or symbol tables are "objects." For example, AutoCAD dictionaries are stored here

END OF FILE

The end of the DXF data is marked with an EOF directive on the last line of the file.

DXF file example

CAD3.dxf

0 = Indicates the start of a new section

2 = Indicates the name of the section

9 = Variable name identifier (used only in HEADER section

of the DXF file)

Indicates the version of the CAD program

1 = Text value for an entity

X, Y, and Z drawing extents lower-left corner

X value of the lower-left corner point

Y value of the lower-left corner point

Z value of the lower-left corner point

X, Y, and Z drawing extents upper-right corner

Different options in program(0 = off , 1 = on )

Thank You