fbgrid — draw a grid on a frame buffer
fbgrid
is used to generate a grid on a frame buffer.
The environment
variable
FB_FILE
is used to select the display device (see
brlcad(1)).
If this variable is not set, the default device for your system will
be used.
The
-SWN
options can all be used in the normal way to specify the size of
the grid (see
brlcad(1)).
The default grid size is 512x512.
The framebuffer can be declared with the
-F
flag.
-c
will clear the screen before drawing.
The available patterns are:
-b
for binary spacing with lines at 8, 64, and 128 line intervals.
-d
for decimal spacing with lines at 10, 50, and 100 line intervals
(the default).
-o
for the old cross grid pattern.