MATLAB: Delete drawn shape from image

deletedelete keyellipsefigureimageimellipseshape

hi,

I have drawn several ellipses using imellipse instruction on an image in a figure. when i choose one of those ellipses and wanna delete it using 'delete' key, it doesn't work. how can i do it? tnx

Best Answer

gco() should return the handle of the currently selected object. Selecting is just a matter of clicking (once) on the object. Recognizing the delete key would be done by setting KeyPressFcn callback for the figure: be sure to check the event data to be sure the proper key was pressed. It might also be a good idea to get() the Type of the current object and check it, so that you only delete the kind of objects you want.

Related Solutions

MATLAB: Uiwait Interfering with Object Wait Function in GUIDE GUI

Try roipolyold() instead, and don't use the wait. I think that will avoid the problem. Or else try imfreehand():

message = sprintf('Left click and hold to begin drawing.\nSimply lift the mouse button to finish');
uiwait(msgbox(message));
hFH = imfreehand();
% Create a binary image ("mask") from the ROI object (if needed).
binaryImage = hFH.createMask();
xy = hFH.getPosition; % Get (x,y) coordinates also.

MATLAB: How to delete a ROI after having drawn a new one

Probably the most robust way is to save the handles to imrect/impoly and then delete just that object. Something like this:

hrect = imrect(IMG)   % your imrect code here
hpoly = impoly(IMG)   % your impoly code here
%and then later when you want to delete it:
delete(hrect);   
delete(hpoly);

Best Answer

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MATLAB: Uiwait Interfering with Object Wait Function in GUIDE GUI

MATLAB: How to delete a ROI after having drawn a new one

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