The
following group codes apply to underlays. In addition to the group
codes described here, see
Common Group Codes for Entities.
For information about abbreviations and formatting used in this
table, see Formatting Conventions in This Reference.
Please note that UNDERLAY
group codes are common to DWFUNDERLAY and DGNUNDERLAY. The differentiation
between DWFUNDERLAY and DGN UNDERLAY occurs in group code 0, defining
the object name.
Underlay group codes
|
Group code
|
Description
|
| 0 |
Object name. Defined as “DWFUNDERLAY” for DWFUNDERLAY entities,
or “DGNUNDERLAY” for DGNUNDERLAY entities.
|
100
|
Subclass marker (AcDbUnderlayReference)
|
340
|
The ID of the AcDbUnderlayDefinition
object
|
10,20,30
|
The X,Y,
and Z coordinates of the insertion
point of the underlay. These are OCS/ECS coordinates
|
41,42,43
|
DXF: X, Y,
and Z scale factors
|
50
|
Rotation Angle (in OCS/ECS.
CCW from the coordinate system X axis and around
the Z axis)
|
210,220,230
|
Normal vector (in WCS)
|
280
|
Flags 1 = Clipping is on 2 = Underlay is on 4 = Monochrome 8 = Adjust for background 16 = Clip is inside mode
|
281
|
Contrast (value between
20 and 100)
|
282
|
Fade (value between 0
and 80)
|
11, 21
|
Repeating: 2d points
in OCS/ECS. If only two, then they are the lower left and upper
right corner points of a clip rectangle. If more than two, then
they are the vertices of a clipping polygon
|
