MATLAB: Get numeric handle of imline, impoint etc hggroup

hggroup imline impoint handle

I want to get the numeric handle of hggroup objects such as imline or impoint, from the object that you get when you create these things. This seems to be the inverse of all the questions I can find answered in this area.

I have complicated solutions using findobj after each imline or impoint is created to get the handle value, but this feels clumsy and silly. This feels like some simple function that I'm just not aware of or not using correctly.

(As background, the reason I want the numeric handle is to quickly compare with a figure's "currentobject" function during user interaction).

Best Answer

One way to do it:

h = imline;
numeric_handle = findobj(h,'-depth',0)

Related Solutions

MATLAB: Use addNewPositionCallback to updates stored line coordinates in GUIDE

From the documentation:

addNewPositionCallback — Add new-position callback to ROI object
id = addNewPositionCallback(h,fcn) adds the function handle fcn to the list of new-position callback functions of the ROI object h. Whenever the ROI object changes its position each function in the list is called with the syntax:
fcn(pos)
where pos is of the form returned by the object's getPosition method.
The return value, id, is used only with removeNewPositionCallback.

This indicates that only 1 input is being passed to hpos, and you've define it to require 2 inputs. I'm not sure it'll work, but I would try:

handles.h = imline(gca,[-1 -1],[-2 2]);
id = addNewPositionCallback(handles.h,{@hpos,handles.iminfo}); 
% Update handles structure
guidata(hObject, handles);
   function hpos(pos,iminfo_obj)
   % Display image info
   set(iminfo_obj, 'String','It works!');
   % I'm assuming 'It works!' is a placeholder and you want to use pos above

MATLAB: How to increase the size of the endpoints in the IMLINE in MATLAB 7.9 (R2009b)

To increase the size of the end squares in the IMLINE, use the 'MarkerSize' property of the line. The following code sample shows a way to do this:

figure, imshow('pout.tif');
h = imline;
position = wait(h);
%Please draw the line in the figure
%Change the end point size to '40'
c = get(h,'Children');
set(c(1),'MarkerSize',40)

Best Answer

Related Solutions

MATLAB: Use addNewPositionCallback to updates stored line coordinates in GUIDE

MATLAB: How to increase the size of the endpoints in the IMLINE in MATLAB 7.9 (R2009b)

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