In a
previous post I talked about create a round corner rectangle in gnuplot. But none application was involved in that post. Today I use the method to create a round corner key box.
###############################################
#Variables:
##(a,b) is the low left vertex of the rectangle
##(c,d) is the up right vertex of the rectangle
##rx is the radius along xaxis
##ry is the radius along yaxis
##x is the independent variable of the curve
f_low(a,b,c,d,rx,ry,x)=a<x && x<a+rx ? \
ry*sqrt(1((xarx)/rx)**2)+b+ry : \
a+rx<x && x<crx ? b :crx<x && x<c ?\
ry*sqrt(1((xc+rx)/rx)**2)+b+ry : 1/0
#The low curve of a round corner rectangle
f_up(a,b,c,d,rx,ry,x)=a<x && x<a+rx ?\
ry*sqrt(1((xarx)/rx)**2)+dry : \
a+rx<x && x<crx ? d :crx<x && x<c ?\
ry*sqrt(1((xc+rx)/rx)**2)+dry : 1/0
#The up curve of a round corner rectangle
###############################################
reset
set term png font "Times,18" #terminal and output file
set output "round_corner_rectangle_key_box.png"
set tics out nomirror
unset key #key will be created manually
set sample 1000 #samples
#Setting the back ground color
set object 1 rect from graph 0,0 to graph 1,1 back
set object 1 rect fc rgb "#AAAAFF" fillstyle solid 1.0
#The text of the key (some people call it legend)
set label center "y=f(x)" at 5.75,0.7 front
#x and y label
set xlabel "x"
set ylabel "y=f(x)"
#Plot the curve,round corner rectangle and sample line of key
plot sin(5.*x)*exp(x*x/20.) w l lw 2 lc rgb"green",\
'+' u 1:(f_low(3.5,0.5,9,0.9,0.5,0.05,$1)):\
(f_up(3.5,0.5,9,0.9,0.5,0.05,$1)) w filledcurve\
lc rgb"pink" notitle,\
x>7.5 && x<8.5 ?0.7:1/0 w l lw 2 lc rgb"green"
Nothing new in this script. The only important and difficult thing is deciding the position of the key text, key sample line and key box. At last we get a picture like this one.

Round corner key box in gnuplot 
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