Strange Behaviour using Zoom with app designer

Hello. I have an image on a UIAxes and want to use a checkbox to either zoom in 4X, or retrun to 1x.

I have tried this:

            value = app.xZoomCheckBox.Value;            
            switch value
                case 1
                  zoom(app.UIAxes,'reset')  % Sets baselevel zoom 
                  zoom(app.UIAxes,4)        % Zoom 4x
                case 0  
                  zoom(app.UIAxes,'out')    % Return to baselevel zoom                
                
            end

with the checkboxclicked (case 1), the image does zoom in 4x.

However when I unclick the checkbox (case 0), I get the error message

Unrecognized function or variable 'firstinput'.
Error in matlab.graphics.interaction.webmodes.zoomWeb

I have also tried zooming 1x, but this did nothing.

Answer 1

[Adam Danz]

According to the documentation, the zoom() function can receive a figure handle as input, not an axes handle. Zoom is applied to the current axes within the figure.

If you call zoom(app.UIFigure,'out') with a figure handle, it works.

Note that you can change the current axes programmatically by setting

figureHandle.CurrentAxes

The weird thing is that the function breaks with axes inputs when the 'out' option is used (and maybe others) but not with 'reset' or factor values. Too bad the section of code that receives the inputs is wrapped in p-code.

[Jason]

Hi, thanks.

So do I have to apply the 'out' to the whole figure. I have several UIAxes and only want to apply to one of them

[Adam Danz]

Yes. As my answer states, the zoom is applied to the current axes on the figure and you can control which axes is current either by clicking on the axes or setting it programmatically using the CurrentAxes property of the figure.

So the workflow would look like this,

app.UIFigure.CurrentAxes = app.UIAxes1;
zoom(app.UIFigure, 'out')

[Jason]

 Thankyou

[Adam Danz]

Glad I could help!