MATLAB: Findobj to refresh lines in a graph

Question

Hello, I am working in a GUI and I want to add a new plot in a figure (axis) represented before.

The problem is that can not find the way to delete last function plotted for repeat the action but dont "hold on" the plots

Code for the button:

   function pushbutton10_Callback(hObject, eventdata, handles)
axes(handles.axes2) %active the figure
pos=getappdata(0,'cursorposition');  %this works!
%plot lines
line1 = hline(pos(1)); this works too! 
line2 = vline(pos(2));
guidata(hObject, handles);

If I click again I need to use findobj to localize line1 and line2 and delete it if they exist. Ive tried using findobj('type','line') but I couldnt find.

this psuedo code it has to be before plot:

if line1 or line2 exist then
delete(line1)
delete(line2)
end

maybe it is easier if I create a handle for this ?

thanks!

Answer 1

Yes, it is easier if you create a handle ...

if isfield(handles, 'line1') && ishandle(handles.line1)
   delete(handles.line1)
end
if isfield(handles, 'line2') && ishandle(handles.line2)
  delete(handles.line2)
end
handles.line1 = hline(pos(1)); this works too! 
handles.line2 = vline(pos(2));