getrect - cancel user input
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Hi, Is it possible to cancel the getrect when the user presses (for example) escape button on the keyboard? I wrote a GUI which uses the getrect to select a rect in the image. In the case the user presses esc (when the matlab waits for rect selection, i.e. while in getrect), I want to keep the previously selected area, and return from the calculation with the new rect.
Code example:
----------------
P = getrect(handles.im1);
if (<user pressed esc event> )
return;
----------------
Is it possible to identify such event?
Thanks Hilit
1 个评论
Uday
2017-8-26
I was facing similar issue and struggled to find a solution for couple of days. Finally the following seems to work.
Replace
rect=getrect()
with
h=imrect();
rect=getPosition(h);
delete(h);
Key events will work fine now.
回答（2 个）
Image Analyst
2016-5-6
You can use imrect() instead of getrect():
imshow('moon.tif') % Sample image.
uiwait(helpdlg('Click and drag out a rectangle.'));
title('Double-click inside rectangle to accept it, or type Esc to bail out');
someAxesHandle = gca;
% Have user draw rectangle.
hRect = imrect(someAxesHandle)
position = wait(hRect)
% Check if they typed Esc or double clicked.
if isempty(position)
uiwait(helpdlg('You typed Esc.'));
else
uiwait(helpdlg('You drew a rectangle!'));
end
fprintf('Done!\n');
This question is old, but still getting hits, so I'll try to answer it:
What blocks the ui is the following line inside the getrect function (line 106 in current 06-05-2016 code):
waitfor(GETRECT_H1, 'UserData', 'Completed');
in order to free this lock you need to do (line 251):
set(GETRECT_H1, 'UserData', 'Completed');
I had to do a toggle button with repeated getrect calls as long as it is pressed. I did something like:
function callback(do)
% i'm calling this with callback(get(toggle1,'Value))
global getrect_do
getrect_do = do;
while getrect_do
% rubberand selection.
try
% using try to catch user clicking something else, and then repeating getrect call
r = getrect(someAxesHandle);
catch
continue
end
if getrect_do
% user did mark a rectangle!
someProcess([r(1),r(1)+r(3)]);
else
% user abort. while loop will terminate
end
end
% force getrect to end
global GETRECT_H1
getrect_do = false;
set(GETRECT_H1, 'UserData', 'Completed');
Callbacks still execute even during waitfor().
Ido
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