plot over writing on gui

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Jerry Gregoire 2015-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/222488-plot-over-writing-on-gui

评论： Adam 2015-6-5

I have a GUI that calls a plot function (via a timer) that plots in a separate figure. Occasionally the plot overlays the GUI. I am plotting to the axes, so this should not happen. Example:

plot(hAxes(i), XData, YData);

Here is a repeatable scenario: The timer is repeatedly plotting on a given axes, when I press a UI button, the GUI gets overlaid with the plot just as or before the callback is executed. (I put a dbstop at the beginning of the callback. The GUI would still be overwritten even without the dbstop. It's as if ML gets confused when the GUI figure is made current, even though the plot axes is specified.

Any ideas?

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Jerry Gregoire 2015-6-4

Hi Geoff, Adam

I figured out what is happening. I was executing a 'hold off' command unnecessarily in my timer function, (it was in a previous utility I had written). The hold off command added an axes to my GUI. It looked like a plot but was empty. Apparently hold off does more than just instruct Matlab for the next axis update, it immediately creates a fresh axis in the figure.

Thanks for your ideas.

Adam 2015-6-5

Yes, I have been caught by that a few times. hold off will create an axes specially to turn their hold status off if it doesn't have an active axes on the current figure!

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