15.5.539 set

set [, visual=visual] [, /set, /reset, /showalloc, /whitebackground, /ulimcoords, /allowpromts, /xsynchronize, /parsesilent, /zoom]

Modifies the default behavior of various commands and aspects of LUX. By default, binary keyword selections are added to those already in place. The binary keywords are:

/set

Clear all previous specifications and set only the specified selections.

/reset

Reset the specified selections so they are no longer active.

/showalloc

[debug] Display information about allocation and freeing of memory.

/whitebackground

Make white rather than black the default window background, and black rather than white the default line color. This setting has effect only when opening a new window with xport or tv or one of its cousins.

/ulimcoords

Count image placement coordinates from the upper left-hand corner rather than the lower left-hand corner.

/yreverseimg

When set, images are displayed with image element (0,0) in the upper left-hand corner rather than the lower left-hand corner. This reversed display is the native format of the x window system, so it may (slightly) speed up display of images.

/allowpromts

When this is set, the user can enter one of the valid LUX prompts at the very start of an input line and such prompts will be ignored. This is convenient for entering a set of lines using cut-and-paste with the mouse pointer.

/xsynchronize

[x11] When set, internal x window commands are executed in the exact order in which they are encountered, so that error messages (if any) are displayed right when the LUX command that generates them is being executed. When reset, and by default, x window commands are executed in the most efficient order, which generally yields faster execution than with synchronization, but may result in error messages appearing when much later LUX commands are already being executed. Synchronization is useful to find out exactly which LUX command generates a particular x error message.

/parsesilent

When set, instructs the parser to not issue warnings at all when encountering patently unbalanced parentheses, square brackets, or quotes, mimicking LUX 1, and to issue only bare-bones messages associated with other parser errors. Ordinarily, unbalanced items and other syntax errors yield full-scale error messages. Note: Before version 3.2.19, a key /parsewarn with the opposite meaning to /parsesilent was used instead. With the key, the default behavior has also switched, to full warnings and error messages.

/zoom

[x11] When set, images are displayed by default with the greatest integer zoom factor that allows them to fit in the window, similar to tv,/scale.

[x11] If visual is specified, then its string value specifies the visual class you wish to use for the output of graphics, such as images and plots. There are six different visual classes, which differ in whether they support color or only grayscale, dynamic (changeable) or static colors, and linked or independent primary colors. Valid names for visual come in three sets. Names from the first set all have three characters, the first a g for grayscale or a c for color, the second a s for static or a d for dynamic, and the third an l for linked or an i for independent. The first set is: gsl, csl, csi, gdl, cdl, cdi. Names from the second set are the x window designations for these visual classes. They are, given in the same order as for the first set: StaticGray, StaticColor, TrueColor, GrayScale, PseudoColor, DirectColor. Names from the third set consist of the capital letters from the corresponding names of the second set, i.e., sg, sc, tc, gs, pc, dc. Any one of these 18 names may be specified for visual, and all characters may be specified in either lower case or upper case.

There may be more than one visual for your screen of the class you specify. In that case, one is selected according to unspecified rules.

If a connection to the x server was already established (e.g., if you already opened a LUX window), then a visual has already been selected. It is an error to call set if a visual is already active that does not match visual. If you wish to change to a different visual class, then you must first explicitly close the current connection to the x server (using xclose), which will delete all open graphical LUX windows.

See also: xport, setforeground, setbackground, trace, step, tv, xclose, xopen