Generate an interactive heatmap

I've created a heatmap using "imagesc" and I now want to make the plot interactive. I want the user to be able to click on any square they want and after doing so, another plot will be generated that shows the error points made within that particular square. How would I go about doing this? Would I need to create a GUI?

Answer 1

[KSSV]

[X,Y,Z] = peaks(100) ;

pcolor(X,Y,Z)
shading interp 

h = imrect() ;
pos = wait(h);
%  Display the part extracted 
x0 = pos(1) ; y0 = pos(1) ; 
L = pos(3) ; B = pos(4) ;

x1 = x0+L ;
y1 = y0+L ;

N = 500 ;
x = linspace(x0,x1,N) ;
y = linspace(y0,y1,N) ;
[Xi,Yi] = meshgrid(x,y) ;
Zi = interp2(X,Y,Z,Xi,Yi) ;

pcolor(Xi,Yi,Zi) ;
shading interp