gnuplot documentation

70 SET-SHOW gnuplot 4.3 109
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.
70.29 Label
Arbitrary labels can be placed on the plot using the set label command.
Syntax:
set label {} {""} {at }
{left | center | right}
{norotate | rotate {by }}
{font "{,}"}
{noenhanced}
{front | back}
{textcolor }
{point | nopoint}
{offset }
unset label {}
show label
The is specified by either x,y or x,y,z, and may be preceded by first, second, graph,
screen, or character to select the coordinate system. See coordinates (p. 24) for details.
The tag is an integer that is used to identify the label. If no is given, the lowest unused tag
value is assigned automatically. The tag can be used to delete or modify a specific label. To change
any attribute of an existing label, use the set label command with the appropriate tag, and specify the
parts of the label to be changed.
The can be a string constant, a string variable, or a string- valued expression. See strings
(p. 36), sprintf (p. 27), and gprintf (p. 101).
By default, the text is placed flush left against the point x,y,z. To adjust the way the label is positioned
with respect to the point x,y,z, add the justification parameter, which may be left, right or center,
indicating that the point is to be at the left, right or center of the text. Labels outside the plotted
boundaries are permitted but may interfere with axis labels or other text.
If rotate is given, the label is written vertically (if the terminal can do so, of course). If rotate
by is given, conforming terminals will try to write the text at the specified angle; nonconforming
terminals will treat this as vertical text.
Font and its size can be chosen explicitly by font "{,}" if the terminal supports font
settings. Otherwise the default font of the terminal will be used.
Normally the enhanced text mode string interpretation, if enabled for the current terminal, is applied
to all text strings including label text. The noenhanced property can be used to exempt a specific
label from the enhanced text mode processing. The can be useful if the label contains underscores, for
example. See enhanced text (p. 186).
If front is given, the label is written on top of the graphed data. If back is given (the default), the label
is written underneath the graphed data. Using front will prevent a label from being obscured by dense
data.
textcolor changes the color of the label text. can be a linetype, an rgb
color, or a palette mapping. See help for colorspec (p. 32) and palette (p. 122). textcolor may be
abbreviated tc.