'ButtonDownFcn' not working on first click

Hi,

I'm trying to write a simple code to drag lines on a plot, and then get the X values. It worked well for some time, but I can't get it to work anymore; so, I tried the following tutorial code, that doesn't work either:

function test
   f = figure;
   aH = axes('Xlim',[0 1],'Ylim',[0 1]);

   h = line([0.5 0.5],[0 1],'ButtonDownFcn',@startDragFcn);
   set(f,'WindowButtonUpFcn',@stpDragFcn);

         function startDragFcn(varargin)
   set(f,'WindowButtonMotionFcn',@draggingFcn);
         end

         function draggingFcn(varargin)
   pt = get(aH,'CurrentPoint');
   set(h,'XData',pt(1)*[1,1]);
         end

        function stopDragFcn(varargin)
   set(f,'WindowButtonMotionFcn','');
        end
end

I can't click-drag-release; however, if I click and release, I can drag, but obviously can't stop (except if I click outside the plot area on the figure).

I tried without great hope 'hold all', to modify 'Interruptible'/'Hittest' properties, but nothing works and I'm out of ideas...

Thank you for your help

Answer 1

[Jeremy]

Even though my solution is not really elegant, solved.

 %added in the stardrag function:

set(linehandle,'HitTest','off');

 %added in the stopdrag function:

set(linehandle,'HitTest','on');