app designer: save a point on a graph when you click on it

hello.

I would like to click on a graph in matlab app designer, where the x and y are automatically displayed. Then I want to save the x component.

How can I do it?

thanks

Answer 1

[Kevin Holly]

You could create a listener that tracks the position of your mouse within you axes (app.UIAxes) and then save the x and y coordinates as under the property values x and y, respectively.

properties
    x
    y
end

Add listener function as a callback to the UIFigure

app.UIFigure.WindowButtonMotionFcn={@mouseMotionCB_sensorplacement ,app};

Listener function:

function mouseMotionCB_sensorplacement(fig,event,app)
eventname = event.EventName;

switch eventname
    case 'WindowMouseMotion'

        % Obtain Coordinates of mouse for each of the 4 axes
        currentPoint1 = app.UIAxes.CurrentPoint(1,1:3);
        x1 = currentPoint1(1);
        y1 = currentPoint1(2);
        
        % Change pointer to crosshair when within axes.
        if (app.UIAxes.XLim(1)<x1)&&(x1<app.UIAxes.XLim(2)) && (app.UIAxes.YLim(1)<y1)&&(y1<app.UIAxes.YLim(2))
             set(fig,'Pointer','crosshair');         
        else
            set(fig,'Pointer','arrow'); % When outside of axes, return pointer to arrow
        end

    case 'WindowMousePress'
        % When mouse is pressed, get coordinates
        currentPoint1 = ax1.CurrentPoint(1,1:3);
        app.x = currentPoint1(1);
        app.y = currentPoint1(2);
end  

I am not entirely sure what you mean by "where the x and y are automatically displayed".