ATTDEF (DXF)

The following group codes apply to attdef (attribute definition) entities. In addition to the group codes described here, see Common Group Codes for Entities.

Attdef group codes
Group code	Description
100	Subclass marker (AcDbText)
39	Thickness (optional; default = 0)
10	First alignment point (in OCS) DXF: X value; APP: 3D point
20, 30	DXF: Y and Z values of text start point (in OCS)
40	Text height
1	Default value (string)
50	Text rotation (optional; default = 0)
41	Relative X scale factor (width) (optional; default = 1). This value is also adjusted when fit-type text is used
51	Oblique angle (optional; default = 0)
7	Text style name (optional; default = STANDARD)
71	Text generation flags (optional; default = 0); see TEXT group codes
72	Horizontal text justification type (optional; default = 0); see TEXT group codes
11	Second alignment point (in OCS) (optional) DXF: X value; APP: 3D point Meaningful only if 72 or 74 group values are nonzero
21, 31	DXF: Y and Z values of second alignment point (in OCS) (optional)
210	Extrusion direction (optional; default = 0, 0, 1) DXF: X value; APP: 3D vector
220, 230	DXF: Y and Z values of extrusion direction
100	Subclass marker (AcDbAttributeDefinition)
280	Version number: 0 = 2010
3	Prompt string
2	Tag string (cannot contain spaces)
70	Attribute flags: 1 = Attribute is invisible (does not appear) 2 = This is a constant attribute 4 = Verification is required on input of this attribute 8 = Attribute is preset (no prompt during insertion)
73	Field length (optional; default = 0) (not currently used)
74	Vertical text justification type (optional, default = 0); see group code 73 inTEXT
280	Lock position flag. Locks the position of the attribute within the block reference
100	Subclass marker (AcDbXrecord)
280	Duplicate record cloning flag (determines how to merge duplicate entries): 1 = Keep existing
70	MText flag: 2 = multiline attribute 4 = constant multiline attribute definition
70	isReallyLocked flag: 0 = unlocked 1 = locked
70	Number of secondary attributes or attribute definitions
340	hard-pointer id of secondary attribute(s) or attribute definition(s)
10	Alignment point of attribute or attribute definition DXF: X value; APP: 3D point
20,30	DXF: Y and Z values of insertion point
40	current annotation scale
2	attribute or attribute definition tag string
0	Entity type (MTEXT)
100	Subclass marker (AcDbEntity)
67	Absent or zero indicates entity is in model space. 1 indicates entity is in paper space (optional)
8	Layer name
100	Subclass marker (AcDbMText)
10	Insertion point DXF: X value; APP: 3D point
20,30	DXF: Y and Z values of insertion point
40	Nominal (initial) text height
41	Reference rectangle width
46	Defined annotation height
71	Attachment point: 1 = Top left; 2 = Top center; 3 = Top right 4 = Middle left; 5 = Middle center; 6 = Middle right 7 = Bottom left; 8 = Bottom center; 9 = Bottom right
72	Drawing direction: 1 = Left to right 3 = Top to bottom 5 = By style (the flow direction is inherited from the associated text style)
1	Text string If the text string is less than 250 characters, all characters appear in group 1. If the text string is greater than 250 characters, the string is divided into 250-character chunks, which appear in one or more group 3 codes. If group 3 codes are used, the last group is a group 1 and has fewer than 250 characters.
3	Additional text (always in 250-character chunks) (optional)
7	DXF: X value; APP: 3D vectText style name (STANDARD if not provided) (optional)
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)
11	X-axis direction vector (in WCS) DXF: X value; APP: 3D vector
21,31	DXF: Y and Z values of X-axis direction vector (in WCS)
42	Horizontal width of the characters that make up the mtext entity. This value will always be equal to or less than the value of group code 41 (read-only, ignored if supplied).
43	Vertical height of the mtext entity (read-only, ignored if supplied)
50	Rotation angle in radians
73	Mtext line spacing style (optional): 1 = At least (taller characters will override) 2 = Exact (taller characters will not override)
44	Mtext line spacing factor (optional): Percentage of default (3-on-5) line spacing to be applied. Valid values range from 0.25 to 4.00
90	Background fill setting: 0 = Background fill off 1 = Use background fill color 2 = Use drawing window color as background fill color
63	Background color (if color index number)
420-429	Background color (if RGB color)
430-439	Background color (if color name)
45	Fill box scale (optional): Determines how much border is around the text.
63	Background fill color (optional): Color to use for background fill when group code 90 is 1.
441	Transparency of background fill color (not implemented)

If group 72 and/or 74 values are nonzero then the first alignment point values are ignored and new values are calculated by AutoCAD, based on the second alignment point and the length and height of the text string itself (after applying the text style). If the 72 and 74 values are zero or missing, then the second alignment point is meaningless.