zoom - wander around magnified desktop

zoom [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-mono] [-install] [-visual visual] [-delay usecs] [-lenses] [-pixwidth pixels] [-pixheight pixels] [-pixspacex pixels] [-pixspacey pixels] [-lensoffsetx pixels] [-lensoffsety pixels]

The zoom program takes an image, magnifies it, and scrolls around it, fatbits-style.

The image that it manipulates will be grabbed from the portion of the screen underlying the window, or from the system's video input, or from a random file on disk, as indicated by the grabDesktopImages, grabVideoFrames, and chooseRandomImages options in the ~/.xscreensaver file; see xscreensaver-demo(1) for more details.

zoom accepts the following options:

-window

Draw on a newly-created window. This is the default.

-root

Draw on the root window.

-mono

If on a color display, pretend we're on a monochrome display.

-install

Install a private colormap for the window.

-visual visual

Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

-delay microseconds

Slow it down.

-lenses

Instead of doing magnification we just copy an offset region from the original image. If lensoffsetx < pixwidth (and similarly for Y) then consecutive regions will overlap, giving the effect of looking through an array of lenses.

-pixwidth pixels

Width of the magnified pixels.

-pixheight pixels

Height of the magnified pixels.

-pixspacex pixels

Amount of black space between magnified pixels (X direction).

-pixspacey pixels

Amount of black space between magnified pixels (Y direction).

-lensoffsetx pixels

Distance in X direction between consecutive copied regions (only effective when -lenses used).

-lensoffsety pixels

Distance in Y direction between consecutive copied regions (only effective when -lenses used).

X(1), xscreensaver(1), xscreensaver-demo(1), xscreensaver-getimage(1)

Copyright © 2000 by James Macnicol. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.

James Macnicol <james.macnicol@mailexcite.com>, 20-Nov-2000. Much code was shamelessly stolen from the spotlight hack and a few others.