3 lens \- interactive screen magnifier
8 presents a magnified view in its window of an arbitrary area on the screen.
9 The default magnification is 4 (showing each pixel as a 4×4 pixel block in
11 window). This may be changed by typing a digit on the keyboard (with
13 standing for 10), or by using the
17 keys to increase or decrease the magnification by one unit.
18 The lower limit is ×1; the upper ×16.
20 The interface to indicate what area to magnify is dictated by the mouse multiplexing rules of
22 Start by pressing mouse button 1 in the
24 window and dragging, with the button pressed, to the center of the area to magnify.
26 will update the display as the mouse moves.
27 Releasing the button freezes the
30 The magnified view is static\(ema snapshot, not a movie\(embut typing a space or
34 window will refresh the
35 display, as will changing the magnification.
37 To make counting pixels easier, typing a
39 toggles whether a checkerboard grid is imposed on the magnified area.
41 Button 3 brings up a menu of actions.
43 .B /sys/src/cmd/lens.c
45 There should be an easier way to indicate what to magnify.