How to prevent images/axis from moving around

Hi,

I have a GUI made with App Designer that allows the user to draw elliptical ROI's on an image. Because the user might need to make small adjustments, I don't want the image/axis to move around when the user clicks on it (in the event that they are trying to adjust an ROI and accidentally click the image instead). In other words, if the user clicks and drags on the image itself (but not the ROI) I do not want the image to move.

While I was using R2018, this seemed to work just fine for the above problem:

disableDefaultInteractivity(app.myAx)

However, this no longer appears to work in R2019a. Does anyone have an alternative/fix?

EDIT: For anyone who has the same issue, it appears that you must call the above command after you display an image on the axis as well.

[Adam Danz]

hold on

doesn't work?

[Joseph Henry]

Sorry, I don't understand how this locks the axis

[Adam Danz]

You did not explain how the user is interacting with the axes. Some functions that allow users to 'draw' on axes will center the drawn object on the axes which changes the axes limits and aspect ratio. This can be prevented by simply 'holding' the axes (hold on).

[addendum]

Your updated question is clearer.

[Adam Danz]

I just tested it in app designer, r2019a. disableDefaultInteractivity(app.myAx) works fine. Are you sure the command is being called upon the axes?

[Joseph Henry]

I believe so. Here is the relevant code. What am I missing?

% Creates axes and clears the axes component of title, x & y labels, and ticklabels
            app.myAx = axes(app.UIFigure, 'Units', 'Pixels', 'Position',[39,413,800,450], 'XTick', [], 'YTick', []);
            title(app.myAx, []);
            xlabel(app.myAx, []);
            ylabel(app.myAx, []);
            app.myAx.XAxis.TickLabels = {};
            app.myAx.YAxis.TickLabels = {};
            disableDefaultInteractivity(app.myAx)

EDIT: I figured it out. Much thanks!

[Ahmad]

@Joseph Henry how did you figure it out? Please post your code if you don't mind, I'm facing the same problem

Answer 1

[Ahmad]

This one worked for me

% Store current X and Y limits
xLimits = app.UIAxes.XLim;
yLimits = app.UIAxes.YLim;

% Draw your shapes or add data here


% Restore them
app.UIAxes.XLim = xLimits;
app.UIAxes.YLim = yLimits;

[Adam Danz]

Thanks for sharing, @Ahmad. Note that this will successfully return the axis limits to the stored values but it may not prevent the axis limits from changing. Your answer combined with hold(app.UIAxes,'on') would fix that issue

[Ahmad]

@Adam Danz I ran into the issue of not having 'hold on' but fixed it with this code on startup:

ax = app.UIAxes;
ax.XLim = [-100 100];
ax.YLim = [-100 100];

But I've just tried 'hold on' and it seems more reasonable, thanks!

I could change it back to how it was since 'hold on' requires me to zoom out which sometimes doesn't work quite well.