Is there any way to add a point to a GUI graph using animatedline?

Question

Jinwoo Jo 2017-1-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320962-is-there-any-way-to-add-a-point-to-a-gui-graph-using-animatedline

回答： Jordan Ross 2017-1-24

Im getting sensor data from Android wear app by bluetooth spp connection. Previously, I saved each sensor data into an array and plot them. but it got slow as the data gets bigger. Then i changed to draw each point using animatedline function. I read that i could set axe object to animatedline parameter and applied to my code as below, but it shows an error. Is there any way to add a point to a graph rather than plot the whole array for each iteration? If there is, please let me know how to solve it.

-------------------------------------------------------------------------------------------------------

%current code
if  get(hObject,'Value')
    warning off;
    bt = getappdata (handles.main_ex_figure, 'bt_connection');
    fprintf (bt, 'START');
      %Current Time
      t           = datetime('now');
     // filename    = fopen(strcat(strrep(datestr(t), ':', ''),'.txt'), 'a');
     // h           = handles.AxesGraph;
     // axes(h);
      a = animatedline(handles.AxesGraph);
      tic
      while get(hObject,'Value')
          str = fscanf(bt);
          if ~isempty(str)
              data = strsplit(str, ',');
              dataString = data{2:length(data)-1};
              tmp = str2double(dataString);
              addpoints(a, toc, tmp);
              hold on
              drawnow limitrate
          end
      end
      hold off
     // fclose (filename);
  else
      bt = getappdata (handles.main_ex_figure, 'bt_connection');
      fprintf (bt, 'STOP');
  end

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Answer 1

Jordan Ross 2017-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/320962-is-there-any-way-to-add-a-point-to-a-gui-graph-using-animatedline#answer_251860

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Hello Jinwoo,

What you can do is store the axis of the plot into your "handles" that you pass around inside you GUI. Then, when you need to add a point you can do the following:

% assume you have your plot axes stored as "plotHandle" in "handles"
% i.e. handles.plotHandle = plot(...)
handles.plotHandle.XData = [handles.plotHandle.XData newDataPointX];
handles.plotHandle.YData = [handles.plotHandle.YData newDataPointY];
drawnow