when using copyobj() with a contour, changing properties of the copy has no effect

Question

Jonas Reber on 7 Oct 2011

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https://se.mathworks.com/matlabcentral/answers/17706-when-using-copyobj-with-a-contour-changing-properties-of-the-copy-has-no-effect

Hello MatLabers

I'm using a contour plot on several axes. Since I have quite an amount of points, the calculation of the contour ([C,h]=contour(...)) takes quite a while (~10secs) and I therefore copy the contour to the different axes. Plus I create the contour on a temporary axes (for I pass the copy to an object which does not know of the current axes)

   f = figure('visible','off') % hidden
   tmpax = axes('parent',f);
   [C,rc]= contour(tmpax,M,v);

from this point i can change properties (e.g. enable/disable the text:

set(rc,'ShowText','on')

I then pass the handle to my object (class which is also a handle class), which has a property calld "theContour" and an axes "ax" to the following:

   function addContour(this, conthandle)
     try 
       delete(this.theContour); % delete the previous contour 
                                % if there is one already
     catch e
     end
     hold(this.ax,'on');
     this.theContour= copyobj(conthandle,this.ax);
     hold(this.ax,'off');
 end

this works perfectly fine. The contour is copied and displayed.

---

However, I would now like to be able to enable/disable the contour labels. I have a method to do so where I call

set(this.theContour,'ShowText','on'); % or off

this has no influence. The only property that I can change on the copied object is "visible". I also tried to use clabel to enable/disable the labels:

   C = get(this.theContour,'ContourMatrix');
   set(this.theContour,'ShowText','on');
   hold(this.ax,'on');
   text_handle = clabel(C,this.theContour,'LabelSpacing',200);
   hold(this.ax,'off');