问题
How do I adjust the size of the legend in gnuplot (4.6.0)? By this I mean the size of the lines and not just the font size. When I switched from the pdf to pdfcairo terminal the size suddenly jumped and caused the key to overlap the points of interest. (I needed cairo to enable unicode.)
An answer I have just invented is (e.g.):
set key font ",8"
set key spacing 0.5
Is there a better way?
回答1:
To adjust the length of the samples:
set key samplen X
(default is 4)
To adjust the vertical spacing of the samples:
set key spacing X
(default is 1.25)
and (for completeness), to adjust the fontsize:
set key font "<face>,<size>"
(default depends on the terminal)
And of course, all these can be combined into one line:
set key samplen 2 spacing .5 font ",8"
Note that you can also change the position of the key using set key at <position> or any one of the pre-defined positions (which I'll just defer to help key at this point)
来源：https://stackoverflow.com/questions/10834037/gnuplot-adjust-size-of-key-legend