fbline — draw a colored line on a framebuffer
fbline [-c ] [-F framebuffer] [-S|s squaresize] [-W|w screen_width] [-N|n screen_height] [-r red] [-g green] [-b blue] x1 y1 x2 y2
fbline
draws a line on the currently selected framebuffer
between the points (x1, y1) and (x2, y2).
The points must be within the bounds of the framebuffer, or they
are silently limited to an edge.
Use
fbpoint(1)
to determine where to position the points.
The environment variable FB_FILE specifies
the current framebuffer; see
brlcad(1).
Alternatively, the framebuffer may be explicitly specified
by using the
-F
flag.
By default, the requested framebuffer size is 512x512 pixels.
The
-S
(or -s)
flag sets the width and height to the same value.
The
-W
(or -w)
and
-N
(or -n)
flags are used for setting them individually.
The
-c
flag causes the screen to be cleared before the line is displayed.
The default behavior is to draw the line on the current image
without clearing the screen.
The
-r red ,
-g green ,
-b blue
flags specify alternate red, green, and blue rgb values for the
line color. The default color is white. Thus, a green line is
created by turning off the red and green components, i.e., with
-r 0
-b 0
options.