findobj to refresh lines in a graph

2011 10 18
2 个回答
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0 个投票

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!

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 采纳的回答

Daniel Shub
Daniel Shub 2011-10-19

1 个投票

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));

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fjnb86
fjnb86 2011-10-19
it works but only if is the first time or the lines are already plotted
this is a problem because Im in a GUI which and saves the handles
therefore, the statement if is positive but it can not delete the line
Adding try-catch I could do it but I will see without handles and using finobj
thanks! :)
Daniel Shub
Daniel Shub 2011-10-19
I don't quite understand your problem. I am guessing somehow the gui is being saved so handles has the field line1, but that line1 does nto exist. I have edited the answer to include ishandle(handles.line1). This should hopefully fix it.
fjnb86
fjnb86 2011-10-20
exactly, now it works!
;)

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更多回答（1 个）

Olaf
Olaf 2011-10-19

1 个投票

Hi A possible solution might be to use Matlab graphic handles property called 'Tag'. By default it is empty and upon creation of your lines you can assign each of your lines a unique tag, e.g. set(line1, 'Tag', 'myUniqueHLineTag'); Then, when you want to test the existence of any of these lines, you can search through the handles obtained by findobj for this tag.
Olaf

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