GNUPlot Manual

142 gnuplot 4.0 36 SET-SHOW
by 2 repeatedly results in a number which is smaller than mincolors gnuplot tries to install a private
colormap. In this case the window manager is responsible for swapping colormaps when the pointer is
moved in and out the x11 driver’s window.
The default for mincolors is maxcolors / (num colormaps > 1 ? 2 : 8), where num colormaps is the
number of colormaps which are currently used by gnuplot (usually 1, if only one x11 window is open).
Some systems support multiple (different) visual classes together on one screen. On these systems it
might be necessary to force gnuplot to use a specific visual class, e.g. the default visual might be 8bit
PseudoColor but the screen would also support 24bit TrueColor which would be the preferred choice.
The information about an Xserver’s capabilities can be obtained with the program xdpyinfo. For the
visual names below you can choose one of StaticGray, GrayScale, StaticColor, PseudoColor, TrueColor,
DirectColor. If an Xserver supports a requested visual type at different depths, gnuplot chooses the
visual class with the highest depth (deepest). If the requested visual class matches the default visual
and multiple classes of this type are supported, the default visual is preferred.
Example: on an 8bit PseudoColor visual you can force a private color map by specifying gnuplot*maxcolors:
240 and gnuplot*mincolors: 240.
gnuplot*maxcolors: ¡integer number¿
gnuplot*mincolors: ¡integer number¿
gnuplot*visual: ¡visual name¿
36.59.79 Xlib
The xlib terminal driver supports the X11 Windows System. It generates gnuplot x11 commands, but
sends them to the output file specified by set output ’’. set term x11 is equivalent to
set terminal xlib; set output "|gnuplot x11 -noevents". xlib takes the same set of options as
x11.
36.60 Tics
The set tics command can be used to change the tics to be drawn outwards.
Syntax:
set tics {}
show tics
where may be in (the default) or out.
See also set xtics (p. 149) for more control of major (labelled) tic marks and set mxtics for control
of minor tic marks.
36.61 Ticslevel
Using splot, one can adjust the relative height of the vertical (Z) axis using set ticslevel. The numeric
argument provided specifies the location of the bottom of the scale (as a fraction of the z-range) above
the xy-plane. The default value is 0.5. Negative values are permitted, but tic labels on the three axes
may overlap.
To place the xy-plane at a position ’pos’ on the z-axis, ticslevel should be set equal to (pos - zmin) /
(zmin - zmax).
Syntax:
set ticslevel {}
show tics
See also set view (p. 145).