Saving mouse click coordinates on image in GUI

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Brian
Brian 2016-1-29
评论： Brian 2016-2-1
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!

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Walter Roberson
Walter Roberson 2016-1-30
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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Brian
Brian 2016-2-1
I decided to follow the ginput(n) method because it gives a crosshair as well. However, I am unable to get this to work. The crosshair doesn't show on my GUI and it appears no coordinates are saved either. What am I not doing correctly?
% --- Executes on mouse press over axes background.
function axes1_ButtonDownFcn(hObject, eventdata, handles)
% hObject handle to axes1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
SliderLocation = round(get(handles.slider1,'Value'));
[xlist ylist]=ginput(5);
tableData = {xlist(1),ylist(1),SliderLocation};
set(handles.CoordinateTable,'Data',tableData)
% Update handles structure
guidata(hObject, handles)
The code is just using the first set of coordinates as example. Thank you so much!

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