Use sprintf in callback function to get an output variable

Hello,

I've got a very simple callback function 'countclicks', which displays the type of click (normal,alt,extend or open) and its coordinates in the command window when a mouse click is performed on my figure. How can I use sprintf to get the type of click and the associated coordinates in a seperate variable?

Thank you!

function countclicks(gcbo,eventdata,handles)
disp(get(gcf,'SelectionType'))
disp(get(gca,'CurrentPoint'))
end

Answer 1

[Arthur Roué]

function countclicks(gcbo,eventdata,handles)
    strSelectionType = get(gcf,'SelectionType');
    XY = get(gca,'CurrentPoint');
    sprintf('Type : %s, X = %d / Y = %d', strSelectionType, XY(1), XY(2))
end

[Sam]

Thank you! But how exactly can I update the last performed click immediately? Let's say I click left on my figure at a given point in time, is there a way to immediately get a variable which captures this last click?

[Steven Lord]

Callback functions do not return any output arguments. So where do you want to "get a variable" that captures the click location?

I think you may want to use the ginput function.

[Arthur Roué]

You can store thoses values in variable shared with the GUI main function and its nested functions.

function myGUI()
    
    % Create a local variable shared with nested function
    XY = []

    % Creat an axe with a callback
    hAxe = axes(.., 'ButtonDownFcn', @countclicks)


    function countclicks(src, evt)
        strSelectionType = get(src.Parent,'SelectionType'); % src.Parent = figure handme
        XY = get(src,'CurrentPoint');
        sprintf('Type : %s, X = %d / Y = %d', strSelectionType, XY(1), XY(2))
    end
end