Revised VPORT Header Variables

AutoCAD DXF Format

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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

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