tk(n) Tk (4.0) tk(n)
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NAME
tk - Manipulate Tk internal state
SYNOPSIS
tk option ?arg arg ...?
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DESCRIPTION
The tk command provides access to miscellaneous elements of
Tk's internal state. Most of the information manipulated by
this command pertains to the application as a whole, or to a
screen or display, rather than to a particular window. The
command can take any of a number of different forms
depending on the option argument. The legal forms are:
tk appname ?newName?
If newName isn't specified, this command returns the
name of the application (the name that may be used in
send commands to communicate with the application). If
newName is specified, then the name of the application
is changed to newName. If the given name is already in
use, then a suffix of the form `` #2'' or `` #3'' is
appended in order to make the name unique. The
command's result is the name actually chosen. newName
should not start with a capital letter. This will
interfere with option processing, since names starting
with capitals are assumed to be classes; as a result,
Tk may not be able to find some options for the
application. If sends have been disabled by deleting
the send command, this command will reenable them and
recreate the send command. |
tk scaling ?-displayof window? ?number? ||
Sets and queries the current scaling factor used by Tk |
to convert between physical units (for example, points, |
inches, or millimeters) and pixels. The number |
argument is a floating point number that specifies the |
number of pixels per point on window's display. If the |
window argument is omitted, it defaults to the main |
window. If the number argument is omitted, the current |
value of the scaling factor is returned. |
A ``point'' is a unit of measurement equal to 1/72 |
inch. A scaling factor of 1.0 corresponds to 1 pixel |
per point, which is equivalent to a standard 72 dpi |
monitor. A scaling factor of 1.25 would mean 1.25 |
pixels per point, which is the setting for a 90 dpi |
monitor; setting the scaling factor to 1.25 on a 72 dpi |
monitor would cause everything in the application to be |
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tk(n) Tk (4.0) tk(n)
displayed 1.25 times as large as normal. The initial |
value for the scaling factor is set when the |
application starts, based on properties of the |
installed monitor, but it can be changed at any time. |
Measurements made after the scaling factor is changed |
will use the new scaling factor, but it is undefined |
whether existing widgets will resize themselves |
dynamically to accomodate the new scaling factor. |
KEYWORDS
application name, send
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