NAME
lens – interactive screen magnifier

SYNOPSIS
lens

DESCRIPTION
Lens presents a magnified view in its window of an arbitrary area on the screen. The default magnification is 4 (showing each pixel as a 4x4 pixel block in lens's window). This may be changed by typing a digit on the keyboard (with 0 standing for 10), or by using the + and – keys to increase or decrease the magnification by one unit. The lower limit is x1; the upper x16.

The interface to indicate what area to magnify is dictated by the mouse multiplexing rules of rio(1). Start by pressing mouse button 1 in the lens window and dragging, with the button pressed, to the center of the area to magnify. Lens will update the display as the mouse moves. Releasing the button freezes the lens display. The magnified view is static--a snapshot, not a movie--but typing a space or . key in the lens window will refresh the display, as will changing the magnification.

To make counting pixels easier, typing a g toggles whether a checkerboard grid is imposed on the magnified area.

Button 3 brings up a menu of actions.

SOURCE
/sys/src/cmd/lens.c

BUGS
There should be an easier way to indicate what to magnify.
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