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 manipu-
lated by this command pertains to the application as a
whole, or to a screen or display, rather than to a partic-
ular window. The command can take any of a number of dif-
ferent 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 capi-
tals are assumed to be classes; as a result, Tk
may not be able to find some options for the appli-
cation. 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 win- |
dow'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 scal- |
ing 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 displayed 1.25 times as large |
as normal. The initial value for the scaling fac- |
tor 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 wid- |
gets will resize themselves dynamically to accomo- |
date the new scaling factor. |
KEYWORDS
application name, send