gnuplot, draw only the legend and not the graph plot

问题

I have an interactive perl script which uses data from mysql to generate many plots through the Chart::Gnuplot package. There are times when the graph size is overloaded with too many plots.

I would option to generate the gnuplot image containing only the legend (no graph).

回答1:

I don't know if this would help, but...

plot [0:1] [0:1] NaN title "Hello" #Just the label in the legend.

or...

plot sin(x),NaN title "Boo"  #Plots sin(x) (properly labelled) and a second label "Boo"

Of course, this still has the border and other things. You can unset those...unset border and unset tics

来源：https://stackoverflow.com/questions/10282192/gnuplot-draw-only-the-legend-and-not-the-graph-plot