Continuous updating of GUI plotting

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JB 2017-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/358794-continuous-updating-of-gui-plotting

评论： Adam 2017-9-29

I am preparing a gui where the visibility of plots are controlled by checkbox selection in two different axes. Additionally, the user should select the Y vector from a popupmenu. The code is working fine (it could be more elegant) but I have issues with refreshing the plot automatically. At present, If I plot and subsequently select a different Y values from the popupmenu I have to uncheck and recheck the checkmark for the changes to take place in the plot. How can I make the GUI refresh the plot automatically if it is selected (checkmark). Any help is much appreciated:

Here is my code:

% --- Executes on pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
X=[1 2 3 4]
Y1=[10 20 30 40]
Y2=[-1 -2 -3 -4]
handles.X=X;
handles.Y1=Y1;
handles.Y2=Y2;
guidata(gcbo, handles);
UnitFcn(handles)
% --- checkbox function on/off
function C = OnOffStr(D)
OffOn = {'off', 'on'};
L     = (D ~= 0) + 1;  % 0/FALSE => 1, anything else => 2
if length(L) == 1
  C = OffOn{L};   % Reply a string
else
  C = OffOn(L);   % Reply a cell string
end
function UnitFcn(handles)
Y1=handles.Y1;
for p = 1:numel(plotdata)
      Unit = get(handles.popupmenu1,'Value');
      if (Unit==1)
      Y(:,p)=Y1(:,p);
      elseif (Unit==2)%
      Y(:,p)=Y1(:,p)*100;
      end         
  end
handles.Y=Y;
guidata(gcbo, handles);
PlotFcn(handles)
function PlotFcn(handles)
X=handles.X;
Y=handles.Y;
Z=handles.Y2;
%Plot in Axes 1
set(handles.axes1, 'NextPlot', 'add');
    handles.plot1 = plot(X,Y,'visible','off','LineWidth',2, ...
                            'color', [0 0 0],'linestyle', '--', 'parent', handles.axes1);    
%Plot in Axes 2
set(handles.axes2, 'NextPlot', 'add');    
    handles.plot2 = plot(X,Y2,'visible','off','LineWidth',2, ...
                            'color', [0 0 0],'linestyle', '--', 'parent', handles.axes2);
guidata(gcbo, handles);
% --- Executes on button press in checkbox1.
function checkbox1_Callback(hObject, eventdata, handles)
set(handles.plot1, 'Visible', OnOffStr(get(hObject,'Value')));
% --- Executes on button press in checkbox1.
function checkbox1_Callback(hObject, eventdata, handles)
set(handles.plot2, 'Visible', OnOffStr(get(hObject,'Value')));
% --- Specify unit in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
UnitFcn(handles)
function popupmenu1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

This is a simplified code and the "for p = 1:numel(plotdata)" refer to a matrix where I have ~30 different plots.

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JB 2017-9-28

@Adam. So the way the code is working now is the Y data is recalculated when the popupmenu is selected. Is this what you mean, or how can I change it within the XData and YData of the same plotted object. Thanks

Adam 2017-9-29

在 MATLAB Online 中打开

handles.plot1

is the handle to the plot object you created. Instead of just keep replotting it you can use

handles.plot1.YData = ...

to update it with far better performance if you rework your code. Usually I do this by creating an empty plot handle initially then just using an if statement - if the handle is empty then do the plot instruction, else only update the YData (and any other properties that may have changed) of the existing plot.

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