Gwyddion module functions remember parameters values between invocations and also between individual sessions. The place where all the values are stored is called settings. The settings include a few program-wide parameters as well.
The permanent storage for the settings is the file
settings in a user's directory, this usually means
under ~/.gwyddion (Unix) or
Documents and Settings\gwyddion (MS Windows).
The file is only read when Gwyddion starts and written when it terminates.
You should keep this in mind if you want to do some manual modifications.
Unknown entries in the settings are ignored but preserved.
The settings file starts with a magic header line
Gwyddion Settings 1.0
followed by lines with individual parameters and values (that form, technically, a serialised GwyContainer). Gwyddion writes the entries in the alphabetical order but this is not a requirement and you do not have to keep the order when modifying the file.
Each parameter line has the form
"key"typevalue
Typical module settings keys start with
/module/, although
in a few cases the module name part is not actually the module name, either
because several modules share settings or for historical reasons.
Program-wide setting keys start with modulename/app/.
All possible value types are listed in the following table.
| Type | Description |
|---|---|
| boolean |
Logical value that can be either True
or False.
|
| char |
Single character. Normal characters are represented directly
using a single character. Special characters are
represented using the hexadecimal notation as
0x. This
parameter type is not actually used much by modules.
|
| int32 | Signed 32bit integer. Gwyddion writes them in decimal notation but reads also other notations such as hexadecimal. |
| int64 | Signed 64bit integer. Gwyddion writes them in decimal notation but reads also other notations such as hexadecimal. |
| double |
Floating point number. They can be in the scientific format,
e.g. 1.23e-4. They are represented in the
standard C/POSIX locale, i.e. decimal dot is used (not comma or
other separators).
|
| string | String of characters in double quotes, generally UTF-8 encoded. Special characters, including contained double quotes, are escaped using the standard backslash notation. |
Some potentially useful program-wide options that can be modified by editing the settings file:
| Key | Type | Description |
|---|---|---|
| /app/restore-tool-position | boolean |
If set to True, Gwyddion restores not only
size of tool dialogs but also their positions (if possible).
For well-behaved window managers this is more likely to be
annoying than helpful but in MS Windows you might want to try
enabling it.
|
| /app/3d/axes/disable | boolean |
If set to True, axis labels will never be
drawn on OpenGL 3D views,
even if enabled. This can help with certain troublesome 3D
driver/card/GtkGLExt combinations in which Gwyddion is likely
to crash when it tries to draw the axes.
|
| /app/help/user-guide-base | string |
Base location of the user guide for help. If not set, the
default on-line location is used, i.e. something like
"http://gwyddion.net/documentation/user-guide-en",
depending on the language. If you want to use a local copy of
the HTML guide, set this setting to directory name, for instance
"/home/yeti/docs/gwyddion-user-guide-xhtml-en-2014-09-17".
|