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How to set shortcuts for zoom tool in my own GUI?

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Albert Bing
Albert Bing on 26 Jan 2020
Commented: Albert Bing on 28 Jan 2020
I wrote a GUI in which the zoom tool was frequently used, so I wanted to give it a shortcut. I wrote the figure's KeyPressFcn as follows, but it didn't work.
Q1. The "Ctrl+0" means zoom out, and it worked just fine. But "Ctrl+E" to zoom on just didn't work. How should I wrote the function `zoomKeys`?
Q2. I wanted to use "ctrl+=", but it was used by the editor to zip the codes. Can I still somehow use "Ctrl+="?
function myfunc1(fig)
fig.KeyPressFcn = @zoomKeys;
hAxes = axes(fig);
% some codes
plot(1:10);
function zoomKeys(~, event)
if strcmp(event.Modifier, 'control')
switch event.Key
case 'E' %'='
zoom;
% zoom(gcf, 'on');
case '0'
zoom out;
end
end
end
end

  2 Comments

Mohammad Sami
Mohammad Sami on 26 Jan 2020
Using just zoom, will only toggle the mouse zoom on and off.
Pass a value to specifiy how much to zoom in.
zoomfactor = 2;
zoom(zoomfactor);
Albert Bing
Albert Bing on 26 Jan 2020
Well, the question is the shortcut "ctrl+E" just doesn't work, no matter "zoom" or "zoom(2)".

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Accepted Answer

Mohammad Sami
Mohammad Sami on 26 Jan 2020
Edited: Mohammad Sami on 26 Jan 2020
Just tested your code. turns out event key is in lower case. Just to safe (in case of capslock), lets convert the value to upper case before comparison.
function zoomKeys(~, event)
if strcmp(event.Modifier, 'control')
k = upper(event.Key);
% disp(k); % for debugging
switch k
case 'E' %'='
zoom;
% zoom(gcf, 'on');
case '0'
zoom out;
end
end
end

  9 Comments

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Albert Bing
Albert Bing on 27 Jan 2020
Thanks! zoom(2) did work.
Just not perfect. zoom(2) would zoom the center of the axes without the cursor being in the zoom mode, so you can't zoom any area.
I guess the zoom mode can't be exit by shortcut in user defined functions.
Mohammad Sami
Mohammad Sami on 27 Jan 2020
See if Yair Altman's solution works for you. It is quite an old post, so I don't know if it works for the current version.

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