Need help storing constantly changing variables in an array

I found this code online which allows the user to plot points on a graph and automatically connects lines between them. I am trying to modify this in order to suit my purpose:

function draw_lines
% Click the left mouse button to define a point
% Drag the mouse to draw a line to the next point and
% left click again
% Right click the mouse to stop drawing
% 
figure('WindowButtonDownFcn',@wbdcb)
ah = axes('DrawMode','fast');
axis ([1 10 1 10])
   function wbdcb(src,evnt)
      if strcmp(get(src,'SelectionType'),'normal')       
         [x,y,str] = disp_point(ah);
         hl = line('XData',x,'YData',y,'Marker','.');
         text(x,y,str,'VerticalAlignment','bottom');drawnow
         set(src,'WindowButtonMotionFcn',@wbmcb)
      elseif strcmp(get(src,'SelectionType'),'alt')
         set(src,'WindowButtonMotionFcn','')
         [x,y,str] = disp_point(ah);
         text(x,y,str,'VerticalAlignment','bottom');drawnow
         [x,y]
      end
      function wbmcb(src,evnt)
         [xn,yn,str] = disp_point(ah);
         xdat = [x,xn];
         ydat = [y,yn];
         set(hl,'XData',xdat,'YData',ydat);
      end  
   end
   function [x,y,str] = disp_point(ah)
      cp = get(ah,'CurrentPoint');  
      x = cp(1,1);y = cp(1,2);
      str = ['(',num2str(x,'%0.3g'),', ',num2str(y,'%0.3g'),')'];    
   end
end

what I want the code to do is to save the [x,y] variables with each left click the user makes as well as the final right click which should stop the program from running and this [x,y] coordinate should be saved in that array as well. Any suggestions on how I can go about doing this?