How to put a timeout to ginput?

John Williams answered . 2024-07-06 22:32:12

1. Plot the Figure: Plot the figure you wish to show the customer.
2. Initialize Coordinates: Initialize "xt" and "yt" to "NaN".
3. Create Click Flag: Create a flag "clicked" to check if the user has clicked.
4. Create Timer: Create a timer object "t" with a "StartDelay" of "timeout" seconds. Set the "TimerFcn" to "uiresume(gcbf)", which resumes the figure's execution when the timer elapses.
5. Start Timer: Start the timer with "start(t)".
6. Set Mouse Click Callback: Set the "WindowButtonDownFcn" to "mouseClickFcn", which sets the "clicked" flag to "true" and resumes the figure's execution when the user clicks.
7. Wait for User Input or Timeout: Use the "uiwait(gcf, timeout)" function to wait for the figure to be resumed by either the timer or the mouse click.
8. Clean Up Timer: Stop and delete the timer object with "stop(t)" and "delete(t)".
9. Check Click Flag: Check if the "clicked" flag is "true" to determine if the user clicked within the timeout period.
10. Display Coordinates: Print the clicked coordinates to the console.

timed_example();

function timed_example()
    x = linspace(0, 4*pi, 2000);
    y = sin(x);
    plot(x, y);

    timeout = 2;
    [xt, yt] = deal(NaN);  % Initialize the coordinates

    % Create a flag to check if the user has clicked
    clicked = false;

    % Create a timer object to interrupt the execution after the timeout
    t = timer('StartDelay', timeout, 'TimerFcn', @(~,~) uiresume(gcbf));
    start(t);

    % Set the WindowButtonDownFcn to capture the click and resume the figure
    set(gcf, 'WindowButtonDownFcn', @mouseClickFcn);

    % Wait for the figure to be resumed by either the timer or the mouse click
    uiwait(gcf, timeout);

    % Clean up the timer object
    stop(t);
    delete(t);

    % Display the clicked coordinates if clicked within the timeout
    if clicked
        fprintf('Clicked coordinates: (%f, %f)\n', xt, yt);
    else
        fprintf('No click detected within the timeout period.\n');
    end

    function mouseClickFcn(~, ~)
        % Capture the coordinates of the click
        coords = get(gca, 'CurrentPoint');
        xt = coords(1, 1);
        yt = coords(1, 2);
        clicked = true;
        uiresume(gcbf);
    end
end

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