Chapter 2 -- HEADER Section
HEADER Section Group Codes
Revised VPORT Header Variables

The following header variables existed before AutoCAD® Release 11 but now have independent settings for each active viewport. OPEN honors these variables when read from DXF files. If a VPORT symbol table with *ACTIVE entries is present (as is true for any DXF file produced by Release 11 or later), the values in the VPORT table entries override the values of these header variables.

Revised VPORT header variables
Variable Group code Description

$FASTZOOM

70

Fast zoom enabled if nonzero

$GRIDMODE

70

Grid mode on if nonzero

$GRIDUNIT

10, 20

Grid X and Y spacing

$SNAPANG

50

Snap grid rotation angle

$SNAPBASE

10, 20

Snap/grid base point (in UCS)

$SNAPISOPAIR

70

Isometric plane:
0 = Left, 1 = Top, 2 = Right

$SNAPMODE

70

Snap mode on if nonzero

$SNAPSTYLE

70

Snap style: 0 = Standard, 1 = Isometric

$SNAPUNIT

10, 20

Snap grid X and Y spacing

$VIEWCTR

10, 20

XY center of current view on screen


$VIEWDIR

10, 20, 30

Viewing direction (direction from target in WCS)

$VIEWSIZE

40

Height of view