Combining linestyle in legend.

Hi, I have a code that produce the following figure:

As a minimal example:

f1=rand(1,100);
f2=rand(1,100);
f3=rand(1,100);
f4=rand(1,100);
figure;
plot(x,f1,'b',x,f2,'b:',x,f3,'r',x,f4,'r:')
legend('Horizontal chain','','Diagonal chain','')

I would like to clarify that each string of text designate each color of the plot by putting the text in the middle of 2 entry of legend or by combining the 2 linestyle in one like so :

But I couldn't find any way to do this. Thank you for your help.

Answer 1

[Image Analyst]

I think you'd have to find the legend's lines' locations with findobj(), and use fill() or patch() exactly where you want the gray patch (to cover up existing line), and use plot() to draw a line at the new line location- could be tricky.

How about just using appropriate working, like "Horizontal Chain (Lower Limit)" and "Horizontal Chain (Upper Limit)"?