[datacursermode] Counter for data tips in a figure

Hello everybody

I would like to have some kind of counter in my figure, that displays the number of data tips in my figure in real time. If I add a data tip the counter has to raise and if I delete a data tip the counter should decline.

Thanks in advance

Answer 1

[Fritz]

Here's some code, that does not work properly. Perhaps somebody knows why? Sometimes the counter miscounts and the performance of "Rotate 3D" decreases, if the number of datatips increases.

function DataTipCounter

% Example Patch Plot
[X,Y] = meshgrid(-2:0.2:2,-2:0.2:2);
Z = X.*exp(-X.^2 - Y.^2);
figure
h = surface(X,Y,Z);
patch(surf2patch(h))
delete(h)
shading faceted; view(3)

% Show figure toolbar
set(gcf,'toolbar','figure');

% Change the texboxes of the datatips
datacursormode on;
cursorMode = datacursormode(gcf);
set(cursorMode,'UpdateFcn',@myfunction)

% Button to switch Datacursormode On/Off
uicontrol('Style','pushbutton','Units','normalized','Position',...
    [0.01 0.94 0.2 0.05],'String','Datacursor Switch','Callback','datacursormode',...
    'FontUnits','normalized','FontSize',0.4)

        function [output_txt, count] = myfunction(~,event_obj)
            % obj          Currently not used (empty)
            % event_obj    Handle to event object
            % output_txt   Data cursor text string (string or cell array of strings).

            persistent datatip_objects %handles to the datatips on the graph

            n = numel(datatip_objects);
            found_match = 0;
            count = 0;

            %Look for the current datatip in our list of known datatips
            while ~found_match && count < n
                count = count+1;
                found_match = (event_obj == datatip_objects{count});
            end

            uicontrol('Style','text','Units','normalized','Position',...
                [0.79 0.94 0.2 0.05],'String', ['DataTips: ' num2str(count)],...
                'FontUnits','normalized','FontSize',0.8)

            if found_match
            else
                datatip_objects{n+1}=event_obj; %this datatip is new, store its handle
            end

            % Code from the standard 'Update Function'
            output_txt = {count};

        end

datacursormode off;

end

Thanks in advance

Answer 2

[Sean de Wolski]

In R2014b, you can look for found parts of the axes that are PointDataTips

fig = figure;
ax = gca;
plot(rand(1,10))
% add some data tips
ntip = 0;
h = findall(ax);
for ii = 1:numel(h)
    ntip = ntip+isa(h(ii),'matlab.graphics.shape.internal.PointDataTip');
end
disp(ntip)

There's probably a similar thing you can search for in releases before 14b.