fbzoom — modify zoom and window parameters of a frame buffer
Using vi(1) and/or emacs(1) -like keystrokes, fbzoom allows interactive zooming and panning of a frame buffer. Using the optional command line arguments,
-FÂ frame_buffer
explicitly specifies the frame buffer. Otherwise, the environment variable FB_FILE specifies the current framebuffer, see brlcad(1).
-h
changes the frame buffer size to 1024x1024. By default, it is assumed to be 512x512 pixels.
-s image_sqrsize
displays the image file as a square, image_sqrsize pixels per side (default is 512x512).
-w image_width
displays the image image_width pixels wide (default is 512).
-n image_height
displays the image image_height pixels high (default is 512).
Fbzoom will display the image currently in the frame buffer and then act on commands entered by the user. Available commands are:
zoom Bigger (*2)
zoom Smaller (*0.5)
zoom Bigger (+1)
zoom Smaller (-1)
pan Left (1)
pan Down (1)
pan Up (1)
pan Right (1)
pan Left (many)
pan Down (many)
pan Up (many)
pan Right (many)
toggle sense of pan commands
goto Center
zoom 1 1
Reset to normal
Exit
Exit
Note that these commands change the way the frame buffer is viewed but not the image in the frame buffer.