GNUPlot Manual

72 gnuplot 4.0 36 SET-SHOW
{height }
{{no}autotitles}
{title ""} {{no}enhanced}
{{no}box { {linestyle | ls }
| {linetype | lt }
{linewidth | lw }}}
unset key
show key
By default the key is placed in the upper right corner of the graph. The keywords left, right, top,
bottom, outside and below may be used to place the key in the other corners inside the graph or to
the right (outside) or below the graph. They may be given alone or combined.
Plots may be drawn with no visible key by requesting set key off or unset key.
Justification of the labels within the key is controlled by Left or Right (default is Right). The text
and sample can be reversed (reverse) and a box can be drawn around the key (box {...}) in a specified
linetype and linewidth, or a user-defined linestyle. Note that not all terminal drivers support
linewidth selection, though.
The length of the sample line can be controlled by samplen. The sample length is computed as the sum
of the tic length and times the character width. samplen also affects the positions of
point samples in the key since these are drawn at the midpoint of the sample line, even if the sample
line itself is not drawn.
The vertical spacing between lines is controlled by spacing. The spacing is set equal to the product of
the pointsize, the vertical tic size, and . The program will guarantee that the vertical
spacing is no smaller than the character height.
The is a number of character widths to be added to or subtracted from the length
of the string. This is useful only when you are putting a box around the key and you are using control
characters in the text. gnuplot simply counts the number of characters in the string when computing
the box width; this allows you to correct it.
The is a number of character heights to be added to or subtracted from the height
of the key box. This is useful mainly when you are putting a box around the key, otherwise it can be
used to adjust the vertical shift of automatically chosen key position by /2.
All plotted curves of plots and splots are titled according to the default option autotitles. The
automatic generation of titles can be suppressed by noautotitles; then only those titles explicitly
defined by (s)plot ... title ... will be drawn.
A title can be put on the key (title "") — see also syntax (p. 26) for the distinction between
text in single- or double-quotes. The key title uses the same justification as do the plot titles.
An explicitly given title is typeset using enhanced text properties on terminals supporting this, see
enhanced text (p. 127) for more details. This default behavior can be switched off by the noenhanced
option.
The defaults for set key are on, right, top, Right, noreverse, samplen 4, spacing 1.25, title "",
and nobox. The default is the same as that used for the plot borders. Entering set key
default returns the key to its default configuration.
The can be a simple x,y,z as in previous versions, but these can be preceded by one of four
keywords (first, second, graph, screen) which selects the coordinate system in which the position of
the first sample line is specified. See coordinates (p. 18) for more details.
The key is drawn as a sequence of lines, with one plot described on each line. On the right-hand side
(or the left-hand side, if reverse is selected) of each line is a representation that attempts to mimic the
way the curve is plotted. On the other side of each line is the text description (the line title), obtained
from the plot command. The lines are vertically arranged so that an imaginary straight line divides the
left- and right-hand sides of the key. It is the coordinates of the top of this line that are specified with
the set key command. In a plot, only the x and y coordinates are used to specify the line position. For
a splot, x, y and z are all used as a 3-d location mapped using the same mapping as the graph itself to
form the required 2-d screen position of the imaginary line.