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the values in the VPORT table entries override the values of these header<br />
variables.<br />
Revised VPORT header variables<br />
Variable Group code Description<br />
$FASTZOOM 70 Fast zoom enabled if nonzero<br />
$GRIDMODE 70 Grid mode on if nonzero<br />
$GRIDUNIT 10, 20 Grid X and Y spacing<br />
$SNAPANG 50 Snap grid rotation angle<br />
$SNAPBASE 10, 20 Snap/grid base point (in UCS)<br />
$SNAPISOPAIR 70 Isometric plane: 0 = Left, 1 = Top, 2 = Right<br />
$SNAPMODE 70 Snap mode on if nonzero<br />
$SNAPSTYLE 70 Snap style: 0 = Standard, 1 = Isometric<br />
$SNAPUNIT 10, 20 Snap grid X and Y spacing<br />
$VIEWCTR 10, 20 XY center of current view on screen<br />
$VIEWDIR 10, 20, 30 Viewing direction (direction from target in WCS)<br />
$VIEWSIZE 40 Height of view<br />
Special Handling of Date/Time Variables<br />
The CDATE and DATE system variables provide access to the current date and<br />
time. The TDCREATE, TDINDWG, TDUPDATE, and TDUSRTIMER system variables<br />
(and the $TDCREATE, $TDUCREATE, $TDUPDATE, and $TDUUPDATE<br />
DXF header variables) provide access to times and dates associated with the<br />
current drawing. The values are represented as real numbers with special<br />
meanings, as described below.<br />
DATE is the current date and time represented as a Julian date and fraction of<br />
a day in a real number.<br />
.<br />
28 | Chapter 2 HEADER Section
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