How to find the nearest points from 2D image?

Hi

I am working on how to find the nears points in 2D images. I was able to find the coorndates of these image

upload1 = load('xy_data.mat');
x = upload1.x
y = upload1.y
P = [x y]; 
figure,
plot(x(:),y(:),'bo');

The idea is select 3 poins as

[px0 py0] = ginput(3);

From the 2D image, then find the distance between the selected points to all other points in the image.

My apparoch is finding the magntude of the selecting poins.

% find postios 
point0 = [px0(1) py0(1)]; 
point1 = [px0(2) py0(2)]; 
point2 = [px0(3) py0(3)]; 

% distance 
a_point01 = point1(1) - point0(1);
b_point01 = point1(2) - point0(2);

a_point02 = point2(1) - point0(1);
b_point02 = point2(2) - point0(2);

% find vector 
vx = sqrt(a_point01^2 + b_point01^2); 
vy = sqrt(a_point02^2 + b_point02^2); 

magntude = [vx vy]; 

I need to find the all neaset poisnts to the magntude that I did in my code.

I attached mat file for x y

Answer 1

[Matt J]

Just use pdist2 or bwdist.