How to make MATLAB detect keyboard stroke?

425 visualizzazioni (ultimi 30 giorni)
Hi,
I want to write a code which detect left and right arrow stroke in keyboard.
I tried to use below kind of code but it shows crosshair and also interrupts the working of other line. (Making crosshair invisible is somewhat important in this case)
[~,~,button]=ginput(1);
switch button
case 28 %left
case 29 %right
end
Is there any better way to do it? Thanks!

Risposta accettata

Nirav Sharda
Nirav Sharda il 18 Apr 2017
There are a couple of ways to achieve this. You can use the KeyPressFcn callback on the figure window. Here is an example.
h_fig = figure;
set(h_fig,'KeyPressFcn',@myfun);
The myfun here could have something like this.
function myfun(src,event)
disp(event.Key);
end
The other way to achieve this is to use ' waitforbuttonpress ' function. Here is an example code.
k = waitforbuttonpress;
% 28 leftarrow
% 29 rightarrow
% 30 uparrow
% 31 downarrow
value = double(get(gcf,'CurrentCharacter'))
I hope this helps.
  6 Commenti
Joseph Rucker
Joseph Rucker il 20 Apr 2020
How do you find out what the numbers for the keys are?
Caden Scharpf
Caden Scharpf il 21 Apr 2020
The numbers for the keys are their corresponding ASCII Charactershttps://www.petefreitag.com/cheatsheets/ascii-codes/

Accedi per commentare.

Più risposte (2)

balandong
balandong il 23 Mar 2020
Maybe Im bit late to join the party. But you can consider this FEX submission KbTimer. It is MEX base thus quite fast

Amir Azadeh Ranjbar
Amir Azadeh Ranjbar il 19 Ott 2023

Categorie

Scopri di più su 환경과 설정 in Help Center e File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!