check for keyboard press in while loop

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raheem mian 2020-3-10

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回答： Amir Azadeh Ranjbar 2023-10-19

I'd like to check for a keyboard press and increment a number if the right arrow key is pressed and decrement if the left array key is pressed.

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Geoff Hayes 2020-3-11

raheem - please provide some context. Do you have a figure or GUI that you can use to listen for key press events? Or are you doing something else?

raheem mian 2020-3-11

Yeah I have a volume of images that I want to iterate through. I would be using imagesc(vol(:, :, i)) where i is the iterator

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Answer 1

Geoff Hayes 2020-3-12

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raheem - since you have a figure, you could use the WindowKeyPressFcn to listen for a key press event (assuming that the figure has focus). You could then change the contents of the axes given the left or right arrow. Just save the below to a file named MyKeyPressListener.m.

function MyKeyPressListener
hFig = figure;
hAxes = gca;
set(hFig,'WindowKeyPressFcn',@keyPressCallback);
    function keyPressCallback(source,eventdata)
        % determine the key that was pressed
        keyPressed = eventdata.Key;
        if strcmpi(keyPressed,'rightarrow')
            C = [0 2 4; 8 10 12; 16 18 20];
            imagesc(C, 'Parent', hAxes);
        elseif strcmpi(keyPressed,'leftarrow')
            C = [0 2 4 6; 8 10 12 14; 16 18 20 22];
            imagesc(C, 'Parent', hAxes);
        end
    end
end