How to automatically update editText box with 'new axes limit'

Neeta Dsouza answered . 2025-04-25 23:24:22

To automatically update an `editText` box with the new axes limits in a MATLAB GUI, you can use callback functions. Here’s a basic approach:

1. Create the GUI Elements:
   Ensure you have an `axes` object and an `editText` box in your GUI.

2. Add a Callback Function for Axes Limits Change:
   Create a callback function that gets triggered whenever the axes limits change. This function will update the `editText` box with the new limits.

3. Set the Callback in the Axes Properties:
   Use the `addlistener` function to monitor changes in the `XLim` and `YLim` properties of the axes.

Here’s a sample code snippet:

% Create the GUI elements (axes and editText)
hFig = figure;
hAxes = axes('Parent', hFig);
hEditText = uicontrol('Style', 'edit', 'Position', [10, 10, 200, 30]);

% Plot something in the axes
plot(hAxes, rand(1, 10));

% Add listeners for axes limits changes
addlistener(hAxes, 'XLim', 'PostSet', @(src, event) updateEditText(hAxes, hEditText));
addlistener(hAxes, 'YLim', 'PostSet', @(src, event) updateEditText(hAxes, hEditText));

% Callback function to update editText with new axes limits
function updateEditText(hAxes, hEditText)
    newLimits = sprintf('XLim: [%f, %f], YLim: [%f, %f]', ...
                        hAxes.XLim(1), hAxes.XLim(2), hAxes.YLim(1), hAxes.YLim(2));
    set(hEditText, 'String', newLimits);
end

Explanation:
1. GUI Elements: This script creates a figure with axes and an `editText` box.
2. Listeners: Two listeners are added to the axes to monitor changes in `XLim` and `YLim`.
3. Callback: The `updateEditText` function updates the `editText` box with the new axes limits whenever they change.

This approach ensures that the `editText` box is always in sync with the axes limits, providing a dynamic and responsive user interface.

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