How to prevent zooming out past a specific extent in UIAxes?

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meghannmarie 2020-9-29

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评论： meghannmarie 2020-10-13

How do I prevent user from zooming out past an extent in App Designer? In this example I do not want the user to be able to manually zoom out past [180 180] on xaxis or [-90 90] on yaxis. I attached a picture to illustrate.

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Answer 1

Nitin Kapgate 2020-10-12

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To limit the user from zooming out past an extent, you can add a custom zoom button (of 'push' button type) to the UIAxes.

In the custom callback for the custom Zoom button, query the current X and Y axis limits for the UIAxes object. If ther X and/or Y limits after zooming out go beyond ehat is required, set the X and Y limits of the UIAxes to the limits you desire.

You can refer this documentation to learn more about adding a custom button to UIAxes.

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meghannmarie 2020-10-13

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How do I program the callback function to zoom out? I tried this and it didn't work:

tb = axtoolbar(app.UIAxes,{'zoomin','restoreview'});
btn = axtoolbarbtn(tb,'state');
btn.Icon = 'zoomout';
btn.Tooltip = 'Zoom Out';
btn.ValueChangedFcn = @zoomOut;
function zoomOut
   zoom(app.UIAxes,'Direction','out')
end