问在gnuplot中将键放在多图图形下

EN

#!/usr/bin/env gnuplot

### n: change this parameter to equal the number of data sets to be plotted
n = 3
# t: top margin in pixels
t = 75.0
# b: key height in pixels (bottom margin)
b = 300.0
# h: height of output in pixels
h = 150.0*n + t + b

### define functions to help set top/bottom margins
top(i,n,h,t,b) = 1.0 - (t+(h-t-b)*(i-1)/n)/h
bot(i,n,h,t,b) = 1.0 - (t+(h-t-b)*i/n)/h

### first set up some basic plot parameters
set term pngcairo enhanced size 800,h font 'FreeMono-Bold,14'
set output 'bigkey.png'

set title 'Big Key Plot'
set ylabel 'Y Axis'

set multiplot layout (n+1),1
### First plot
# change only plot command here
currentplot = 1
set tmargin at screen top(currentplot,n,h,t,b)
set bmargin at screen bot(currentplot,n,h,t,b)
unset key
unset xtics
plot sin(1*x) title 'Line 1', \
     sin(2*x) title 'Line 2', \
     sin(3*x) title 'Line 3', \
     sin(4*x) title 'Line 4', \
     sin(5*x) title 'Line 5', \
     sin(6*x) title 'Line 6', \
     sin(7*x) title 'Line 7'
### Middle plot
# copy and paste this code to make more middle plots
currentplot = currentplot + 1
set tmargin at screen top(currentplot,n,h,t,b)
set bmargin at screen bot(currentplot,n,h,t,b)
unset title
replot
### Last plot
# change only plot command here
currentplot = currentplot + 1
set tmargin at screen top(currentplot,n,h,t,b)
set bmargin at screen bot(currentplot,n,h,t,b)
set xlabel 'X Axis'
set xtics
replot
### Last (key) plot
set tmargin at screen bot(n,n,h,t,b)
set bmargin at screen 0
set key center center
set border 0
unset tics
unset xlabel
unset ylabel
set yrange [0:1]
plot 2 t 'Line 1', \
     2 t 'Line 2', \
     2 t 'Line 3', \
     2 t 'Line 4', \
     2 t 'Line 5', \
     2 t 'Line 6', \
     2 t 'Line 7'

unset multiplot

set key at screen 0.5,screen 0.1 #for example