CODEWITHSUNDEEP
matlab
FactorialTime
FactorialTime

Reputation: 147

How do I make a function run again on a key press?

I have a function that displays a graph with some random elements. I want to have it so that when the user presses a certain key the function runs again, redistributing these random elements on the graph. What is the best way to go about doing this?

Upvotes: 1

Views: 192

Answers (3)

JustinBlaber
JustinBlaber

Reputation: 4650

You want to set a key press callback for a figure you're using in a script by using the KeyPressFcn like so:

h = figure('KeyPressFcn',@testcallback);

Then place the following in a function testcallback.m file (you can also use a function handle):

function testcallback(hObject,callbackdata)
    % Check to make sure key pressed is the escape key
    if (strcmp(callbackdata.Key,'escape'))
        % Do whatever processing you want
        imshow(rand(40));
    end
end

When you run the script, a figure will appear. Everytime you press escape, the function will fire:

enter image description here

Upvotes: 1

bern
bern

Reputation: 366

using the input() function in MATLAB allows you to prompt and ask a user for input. You can use this function to prompt the user to enter a key, when this key is entered, your function can be called and re-run.

Documentation on this can be found on the Mathworks website

Upvotes: 0

rayryeng
rayryeng

Reputation: 104484

You can wrap this within a while loop and using ginput. Put your function call within a while loop, use ginput and poll for a keystroke, and while this key is being pushed, keep going. Something like this, assuming that your figure is open after each call to the function:

while true
    %// Generate random data
    %// Call function
    %// Open figure

    %// Get a key from the user
    [~,~,b] = ginput(1);

    %// If you push C or c, then continue
    if b == 67 || b == 99
        continue;
    else %// Else, get out
        break;
    end
end

Upvotes: 2

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