Add a callback function for impoint object
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I have a GUI where the user uses impoint to add points to the axes. Whenever an impoint object is created, I want to add a callback function that is called whenever the point is dragged. I also want several inputs to be passed to the callback function. How do I do this?
I think this uses iptaddcallback(h,callback,func_handle), but I can't figure out how to pass inputs to the function handle, or what to use for the 'callback' property. New to Matlab here :P Any help would be great, thanks!
回答（2 个）
Sean de Wolski
2012-8-1
编辑：Sean de Wolski
2012-8-8
Sounds like you will want to use its 'addNewPositionCallback' function.
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I think you can pass it the typical way using a cell array that contains the function handle and additional inputs. E.g:
h = figure;
f = @(src,evt,x) disp(x);
x = 'pi';
iptaddcallback(h, 'WindowButtonMotionFcn', {f,x});
4 个评论
JM
2012-8-1
Image Analyst
2012-8-1
What additional variables do you need access to?
JM
2012-8-7
Sean de Wolski
2012-8-8
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Image Analyst
2012-8-1
0 个投票
What is the use case for this? I don't understand why every point has to have its own individual callback? Are you sure you don't just want the user to click several points and then you run some function when they're done clicking on points?
2 个评论
JM
2012-8-1
Image Analyst
2012-8-1
What would you do in the callback? Anyway, can't you just call ginput and then put whatever code it is that you want to run right after ginput returns with the coordinate? That's how I would approach it because it seems a lot easier.
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