MATLAB: Saving mouse click coordinates on image in GUI

gui mouse location

Hello,
How do I record up to 5 mouse click coordinates ([x,y] relative to the image with (0,0) being in the upper left) on an 512 by 512 image (axes1 of my GUI)? I would like the mouse click locations to be saved in a table, so I can use the values for subsequent calculations.
I found the following script online for saving coordinates, but am not sure how it works and where to put this within the GUI script.
function ImageClickCallback (objectHandle , eventData )
   axesHandle  = get(objectHandle,'Parent');
   coordinates = get(handles.axes1,'CurrentPoint'); 
   coordinates = coordinates(1,1:2);
   %// then here you can use coordinates as you want ...
For the data-capturing table, I suppose I should be doing the following, but I am not sure which callback section to place it under (do I have to manually create a "mouseclick" callback?):
tableData = {x1,y1,z1;x2,y2,z2;x3,y3,z3;x4,y4,z4;x5,y5,z5};
set(handles.CoordinateTable,'Data',tableData)
The Z values refer to the slice number (obtainable from the slider location) since I am showing a stack of images. I believe that after updating the handles, I should be able to perform my calculations from there.
Apologies for the novice question, as I am quite new to MATLAB. Thank you so much!

Best Answer

You have done well to find that information already. The additional information you need is
http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F
to allow you to store the various coordinates.
The ImageClickCallback is something that you would configure as a ButtonDownFcn callback on the image.
You could also consider using ginput(5) to get up to 5 coordinates. The biggest difference between that and using a ButtonDownFcn as a callback is that ginput() is an active command that has to be issued by a running function which would wait for the coordinates and then proceed, whereas callback functions are passive, with no function running until the user triggers the action.
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