External mouse track function

Question

Jakob Sørensen 2012-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/35578-external-mouse-track-function

Hey,

I made a function to track the cursor over certain handles, but for the sake of simplicity, i would like that to be an external function (right now its in the bottom of the GUI). I want to apply it using:

set(hObject, 'WindowButtonMotionFcn',trackCursor(uicontrol,hObject));

Where 'uicontrol' is the name of the axes that should be tracked (like handles.axes1). But when I use the set, I can't figure out, how to obtain the function output, which is x and y, both are scalars. I have also tried saving them into the handle, but this results in an

Error using trackCursor
Too many output arguments.

The functions works fine within the GUI, so it's only the syntax that seems to cause me trouble. Any help would be greatly appreciated, thank you!

- Jake

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Answer 1

Jan 2012-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/35578-external-mouse-track-function#answer_44551

在 MATLAB Online 中打开

This:

... track the cursor over certain handles...

and

 Where 'uicontrol' is the name of the axes that should be tracked (like handles.axes1)

is not getting clear to me.

Perhaps you are looking for:

set(hObject, 'WindowButtonMotionFcn', {@trackCursor, handles.axes1});
...

And the separate function:

function trackCursor(hObj, EventData, Axes1)
handles = guidata(hObj);
P = get(Axes1, 'CurrentPoint');
handles.x = P(1, 1);
handles.y = P(1, 2);
guidata(hObj, handles);

But this contains some guessing of want you might need.

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Jakob Sørensen 2012-4-16

I have to say you're pretty good at guessing. The thing I had trouble with, was passing additional input into the trackCursor function. Sorry for not being very clear about that. And thanks a lot for the help, both of you.

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Answer 2

Walter Roberson 2012-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/35578-external-mouse-track-function#answer_44540

WindowButtonMotionFcn cannot return any values. It can, however, be a function that affects shared variables.

Note that in the syntax you would like to use, trackCursor(uicontrol,hObject) would have to return a function handle to a routine that accepts a src and event object (all callbacks are passed those) and returns nothing.