Drawing line through scatter plot

clear 
I = imread('star.png');
[r,c,nc] = size(I);
GC = I(:,:,2);
BI = GC < 200;
[y,x]=find(BI);
y=y*-1; x=x*-1;
c = linspace(1,10,length(x));
figure
plot(x,y,'.')

The code plots the folowing graph

I want to make on continuous line that produces the same image. So basically x an y cordinates for a line that traces this star.

EDIT: Also wanted to mention that I have tried implementing a polyfit--> polyval rountine but It has not given me the desired results.

[Matt J]

Your code doesn't run to completion:

I = imread('star.png');
[r,c,nc] = size(I);
GC = I(:,:,2);

Index in position 3 exceeds array bounds. Index must not exceed 1.

BI = GC < 200;
[y,x]=find(BI);
y=y*-1; x=x*-1;
c = linspace(1,10,length(x));
figure
plot(x,y,'.')

[Walter Mabry]

Matt,

Thanks for the commetn here. Depending on the image you might have to change that line. It will do the same if you put

I(:,:,1)