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.TH LENS 1
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.SH NAME
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lens \- interactive screen magnifier
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.SH SYNOPSIS
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.B lens
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.SH DESCRIPTION
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.I Lens
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presents a magnified view in its window of an arbitrary area on the screen.
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The default magnification is 4 (showing each pixel as a 4×4 pixel block in
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.IR lens 's
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window). This may be changed by typing a digit on the keyboard (with
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.B 0
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standing for 10), or by using the
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.B +
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and
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.B -
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keys to increase or decrease the magnification by one unit.
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The lower limit is ×1; the upper ×16.
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.PP
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The interface to indicate what area to magnify is dictated by the mouse multiplexing rules of
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.IR rio (1).
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Start by pressing mouse button 1 in the
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.I lens
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window and dragging, with the button pressed, to the center of the area to magnify.
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.I Lens
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will update the display as the mouse moves.
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Releasing the button freezes the
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.I lens
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display.
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The magnified view is static\(ema snapshot, not a movie\(embut typing a space or
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.B .
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key in the
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.I lens
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window will refresh the
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display, as will changing the magnification.
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.PP
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To make counting pixels easier, typing a
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.B g
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toggles whether a checkerboard grid is imposed on the magnified area.
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.PP
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Button 3 brings up a menu of actions.
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.SH SOURCE
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.B /sys/src/cmd/lens.c
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.SH BUGS
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There should be an easier way to indicate what to magnify.
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