Potential Bug with App Designed to Create Subplots of Polar Axes?

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Michael
Michael 2019-6-5
I am trying to programmatically generate a set of polar subplots in my Matlab application. It seems to work almost perfectly, but when I generate polar axis subplots in my app, an empty figure window is generated at the first subplot call (and none of the others). I thought I had left a 'figure' command in my code somewhere, but that is not the problem. I have included a minimally functional reproduction of the problem in the pasted code below (this site won't allow me to attach a file with the .mlapp extension). I tried adding a breakpoint at the first 'ax1 = subplot(2...' call and then stepping into the subplot function, but the figure window pops up as soon as the debugger jumps into that function. I am at a loss and want to know if I have messed something up, or if this is a bug that needs fixing.
The example application below contains one button, whose callback function generates the subplots.
Please let me know if you need more details to answer this question.
-Michael
classdef subplottestapp < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
Panelwithsubplotsofpolaraxes matlab.ui.container.Panel
CallpolarsubplotfunctionButton matlab.ui.control.Button
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: CallpolarsubplotfunctionButton
function CallpolarsubplotfunctionButtonPushed(app, event)
%%%%%%%%%%%%%%%%%%THIS IS THE CODE THAT NEEDS ASSESSMENT
%Required to turn off auto resize for subplots.
%See: https://www.mathworks.com/help/matlab/creating_guis/graphics-support-in-app-designer.html
app.Panelwithsubplotsofpolaraxes.AutoResizeChildren = 'off';
%Plot in the panel
plotparent = app.Panelwithsubplotsofpolaraxes;
%Create two subplots, each with polar axes
%Adapted from: https://www.mathworks.com/help/matlab/creating_guis/graphics-support-in-app-designer.html
ax1 = subplot(2,1,1,polaraxes,'Parent',plotparent);
polarplot(ax1,360*rand(5,1)*pi/180,rand(5,1));
ax2 = subplot(2,1,2,polaraxes,'Parent',plotparent);
polarplot(ax2,360*rand(5,1)*pi/180,rand(5,1));
%%%%%%%%%%%%%%%%%%THIS IS THE CODE THAT NEEDS ASSESSMENT
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 360 464];
app.UIFigure.Name = 'UI Figure';
% Create Panelwithsubplotsofpolaraxes
app.Panelwithsubplotsofpolaraxes = uipanel(app.UIFigure);
app.Panelwithsubplotsofpolaraxes.Title = 'Panel with subplots of polar axes';
app.Panelwithsubplotsofpolaraxes.Position = [1 1 360 464];
% Create CallpolarsubplotfunctionButton
app.CallpolarsubplotfunctionButton = uibutton(app.Panelwithsubplotsofpolaraxes, 'push');
app.CallpolarsubplotfunctionButton.ButtonPushedFcn = createCallbackFcn(app, @CallpolarsubplotfunctionButtonPushed, true);
app.CallpolarsubplotfunctionButton.Position = [186 413 157 22];
app.CallpolarsubplotfunctionButton.Text = 'Call polar subplot function';
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = subplottestapp
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end

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