How do I plot Simulink simulation data in App Designer during simulation?

I am using App Designer to develop an app that controls a Simulink model. I would like to know if it is possible to plot Simulink simulation data in App Designer during simulation, similar to the Scope block.

Answer 1

[MathWorks Support Team]

Scope block cannot be included in App Designer at this time. To plot data on UIAxes in a way similar to the streaming scope, you will need to obtain data from Simulink using “add_exec_event_listener” and write code. Here are the steps:

1. Get Simulink block data using “add_exec_event_listener”. You can refer to this answer for more information:

https://www.mathworks.com/matlabcentral/answers/1851783-how-can-i-access-simulink-block-data-in-app-designer-during-simulation

2. To plot the data in UIAxes, you will need functions that trim the data obtained from step 1 and update lines. Below is an example of how the functions work. Please see the attached file for an example App Designer file and Simulink model.

function clipSignalTraces(app) % Get(trim) Signal Data
    maxSigLen = 5000;
    startX = 0;
    for sigIdx = 1:length(app.signalTraces)
        hLine = app.signalTraces(sigIdx);
        xd = get(hLine,'XData');
        sigLen = length(xd);
        if sigLen > maxSigLen
            startEl = sigLen-maxSigLen+1;
            if xd(startEl) > startX
                startX = xd(startEl);
            end
        end
    end
    if startX == 0, return; end
    for sigIdx = 1:length(app.signalTraces)
        hLine = app.signalTraces(sigIdx);
        xd = get(hLine,'XData');
        yd = get(hLine,'YData');
        elIdx = find(xd <= startX);
        xd(elIdx) = [];
        yd(elIdx) = [];
        set(hLine,'XData',xd, 'YData', yd);
    end
end % clipSignalTraces

function updateSignalTrace(app,sigTag,time,data) % Update signals in UIAxes
    for sigIdx = 1:length(app.signalTraces)
        hLine = findobj(app.signalTraces(sigIdx),'flat','Tag',char(sigTag(sigIdx))); 
        assert(~isempty(hLine));

        xData = [hLine.XData time];
        yData = [hLine.YData data(sigIdx)];

        set(hLine, 'XData',xData, 'YData', yData);
    end
end % updateSignalTrace