how to get the axes properties set from a polar plot handle?

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egregium 2013-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/104442-how-to-get-the-axes-properties-set-from-a-polar-plot-handle

编辑： egregium 2013-10-30

Hi,

I´m trying to make a polar plot in a gui where the radial axis is meant to stay fixed and a couple of points will update every time a push a button. I´ve done this before with plots using the 'xdata' and 'ydata' properties but this does not seems to work for polar plot.

%initialization
  theta  = linspace(0,2*pi,100);
  r      = sin(2*theta) .* cos(2*theta);
  r_max  = max_range;
  h_fake = polar(theta,r_max*ones(size(theta)));
  set(h_fake, 'Visible', 'Off');
  hold on
  % plot a circle at pi/2, 2000
  handles.tgt = polar(pi/2,2000,'o'); 
  handles.lala = 0.1;
.
.
.
% button callback
function start_Callback(hObject, eventdata, handles)
      handles.lala = handles.lala + 0.1*pi/180;
      set(handles.tgt,'xdata',pi/2+handles.lala);
      set(handles.tgt,'ydata',2000);    
% Update handles structure
guidata(hObject, handles);