Selecting points from UI Axes App Designer MATLAB R2019a

I am plotting this histogram on UI Axes App Designer R2019a, and I want the user to be able to interactively split the plot using vertical lines (so that I can get the X coordinate at which they are placed). I was previously using getpts, which does not seem to work on UI Axes. Is there a solution for this?

Answer 1

[Abhilash Padma]

I understand that you want to split the plot using vertical lines whenever you click on the axes. But, there is no built-in functionality of adding callbacks to UIAxes as of now. Rather, consider using the ButtonDownFcn callback of plot object to draw vertical lines. Here, the plot object can be used to get your expected output.The following code below may help you solve the problem.

p=plot(app.UIAxes,1:10);
p.ButtonDownFcn=@mouseClick;
function mouseClick(~,~)
cp=get(app.UIAxes,'CurrentPoint');
xline(app.UIAxes,cp(1,1));
end

For more information, refer the following links: https://www.mathworks.com/help/matlab/creating_plots/button-down-callback-function.html

[Manoj Malviya]

I got an error:

Undefined function 'mouseClick' for input arguments of type 'matlab.graphics.chart.primitive.Line'.

Error while evaluating Line ButtonDownFcn.

Please let me know what can be done

[Nick Kohout]

I got the same error

[Nick Kohout]

I got it to work by making mouseClick a separate m file. Also, I had to change the first line to cp=src.Parent.CurrentPoint;

[Prashanth Thambala]

@Abhilash Padma can you help me to break out of the function, as the function does not run for finite clicks and stores the last clicked value

[Ahmed]

Hello everyone,

I'm also struggling with this. Where should the function (mouseclick) be placed in the code view? I have the similar implementation but my click function doesnt seem to be triggered when I click on the plot. I think the reason is becuase it is in another slider function. So I'm not sure now where to place in my click function in the code view.

% Value changed function: FrequencySlider

function FrequencySliderValueChanged(app, event)

value = app.FrequencySlider.Value;

freq=value;

[d,ix]=min(abs(app.freq_vec-freq));

scatter3(app.UIAxes,app.XYZ(:,1)*10000,app.XYZ(:,2)*10000,abs(app.y(:,ix))*10000,[],abs(app.y(:,ix))*10000,'filled','ButtonDownFcn',@click)

view(app.UIAxes, [0 90]);

c = colorbar(app.UIAxes)

colormap(app.UIAxes, jet)

axis(app.UIAxes, 'tight')

axis(app.UIAxes, 'equal')

app.EditField.Value=value;

function click(~,eventData)

coords = eventData.IntersectionPoint;

app.ZEditField.Value=coords;

end

end