Returning a value from a function after click in figure

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Markus Toivonen
Markus Toivonen 2018-4-18
评论： Walter Roberson 2018-4-18
I would like to return a value from a function, based on the type of click that was used.
I have the following codes:
figure
i = 0;
plot(rand(5))
val = set(gca,'buttondownfcn',@mybttnfcn)
and
function value = mybttnfcn(h,~)
hf = get(h,'parent');
b = get(hf,'selectiontype');
if strcmpi(b,'normal')
value = 1;
disp(value)
elseif strcmpi(b,'alt')
value = -1;
disp(value)
else
value = 0;
disp(value)
end
I would want to capture the 'value' from the function, into a variable where the call happens. Thanks!

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采纳的回答

Walter Roberson
Walter Roberson 2018-4-18
Callbacks cannot return values (except for position constraints functions). You need to get the value out a different way.
https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html
  2 个评论
Markus Toivonen
Markus Toivonen 2018-4-18
Would it be possible to do this in one function?
h = figure;
i = 0;
plot(rand(5))
b = get(h,'selectiontype');
if strcmpi(b,'normal')
value = 1;
elseif strcmpi(b,'alt')
value = -1;
else
value = 0;
end
Currently, it does not react to clicks. I guess due to the lack of "ButtonDownFcn"?
Walter Roberson
Walter Roberson 2018-4-18
https://www.mathworks.com/help/matlab/ref/waitforbuttonpress.html

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