Connecting random points in MATLAB without intersecting lines

I need help with solving this problem. I have randomly generated points (example on Picture #1) and I want to connect them with lines (example on Picture #2). Lines can't be intersected and after connection, the connected points should be look like irregular area.

%Generating random points
xn = randi([3 7],1,10);
yn = randi([3 6],1,10);
%Generated points
xn = [6,3,7,7,6,6,6,4,6,3];
yn = [5,3,4,3,3,6,5,4,6,3];

Picture #1: Picture1

Result should be like this. Picture #2: Picture2

Any idea how to solve this?