Customize Wheel Scroll fxn to work within axes in figure?

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Brian on 16 Jul 2014
Commented: Brian on 21 Jul 2014
Hello, thanks for reading this,
I was wondering, is it possible to create a WindowScrollWheelFcn event exclusive to a axes within a figure I create within a UI? As in, when I cross over the axes in the UI I create and THEN scroll down, I do the callback. Otherwise, I do not activate the callback.
I was thinking I could check the mouse position when I do it in a figure, and if its in the domain of the axes, then do the WindowScrollWheelFcn callback, otherwise do nothing. Would this be the way to go about doing this?
Thanks for your help!

Accepted Answer

Joseph Cheng
Joseph Cheng on 16 Jul 2014
Edited: Joseph Cheng on 16 Jul 2014
i did a quick test script to show you what is possible.
set(h,'windowscrollWheelFcn', 'plot(rand(10))');
set(h,'Windowbuttonupfcn', 'gca');
so with the snippit you can see that if you click on subplot 1 and scroll wheel it'll peform the random plot and do the same with subplot 2. since we can determine which subplot (or axes) were clicked the callback function can determine what to perform. I show how to determine which item was clicked using the windowbuttonupfcn. So in the windowscrollwheelfcn function you can set up something that checks what is the active axes and perform the scrollwheel function.
Brian on 21 Jul 2014
Hello, thanks again for this, I think I'm almost there. I have one last question.
I can use that custom function now, but I was wondering how I can pass the handles sruct (because thats where I have some saved data) to the custom function. Also, I want the custom function to return handles.
So when I activate the custom callback here:
set(h,'windowscrollWheelFcn', {@scrollfunc,gca});
Where do I input the handles struct into the custom function and output handles? I never passed functions this way before, so I don't know how its done here.
Thanks, you've been a big help

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More Answers (2)

Brian on 16 Jul 2014
Thanks! This is perfect.
The lines
set(h,'windowscrollWheelFcn', 'plot(rand(10))');
set(h,'Windowbuttonupfcn', 'gca');
is where the magic happens, right? The first line does the scroll function, and the second one sets the gca to the axes I push on. Is that line of reasoning correct?
Thanks again, this is exactly what I needed!
  1 Comment
Joseph Cheng
Joseph Cheng on 17 Jul 2014
yes. so the first set for the windowscrollwheefcn will perform what will be after. Before I implemented the mouse positioning i used the windowbuttonupfcn to find which axes was last selected. but i realized you want to utilize the mouse positioning to determine which axes is hovered not clicked.

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Brian on 16 Jul 2014
One last question, if I wanted to customize the callback of windowscrollWheelFcn to something other than plot(rand(10)), can I use the line:
set(h,'windowscrollWheelFcn', @doCustomScrollFunction);
and declare doCustomScrollFunction later to do what I want it to do?

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