Buttondownfcn gui axes - matlab

Question

I have a Gui, that it has an axes...In the axes i can draw lines with plot.. but i want to select a line of the axes.. i have tried with buttondownfcn..but it doesn't work.. i have a button DELETE and its callback is:
hold all;
set(handles.axes6, 'HitTest', 'off');
set(handles.axes6,'ButtonDownFcn',('h = copyobj(gcbo,figure)'));
delete_object_axes = findobj(h, 'Type', 'line');
My code is:
% --- Executes on mouse press over axes background.
function axes6_ButtonDownFcn(~, ~, handles)
% hObject handle to axes6 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
hold all;
set(handles.axes6, 'HitTest', 'off');
set(handles.axes6, 'ButtonDownFcn', {#Delete_Callback, handles}');
% --- Executes on mouse press over figure background, over a disabled or
% --- inactive control, or over an axes background.
function figure1_WindowButtonDownFcn(~, ~, handles)
% hObject handle to figure1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
hold all;enter code here
global h;
set(handles.axes6, 'HitTest', 'off');
h = findobj(handles.axes6, 'Type', 'line');
set(h, 'ButtonDownFcn', {#Delete_Callback});
Help me..how can i select and delete a line??? or move??? there is some manner to do it????
It is very important for me..please!! help me!:)

Answer 1

Below is an example code that should help you achieve what you want, based on this discussion in MATLABcentral. What it does is checl if you clicked on a line, if you did, it modifies it, and if you click it again it is deleted. You can paste it in a file and run.
function init()
close all; clear variables; clc;
ax1=ezplot('sin(x)');
set(ax1,'ButtonDownFcn',#mouseClick);
end
function mouseClick(source, event)
if strcmp(get(source,'Type'),'line')
if get(source,'linewidth')==2
delete(source);
return
end
%// Store the handle "source" someplace
%// Demonstration modification:
set(source,'linewidth',2);
end
end
Edit: here's a bit more complicated example, showing how to save variables to the handles structure (a.k.a. guidata):
function init()
close all; clear variables; clc;
hLine(1) = ezplot('sin(x)'); hold all; hLine(2) = ezplot('cos(x)');
set(hLine(:),'ButtonDownFcn',#mouseClick);
grid on
end
function mouseClick(hObject, eventdata)
handles = guidata(gcf); %#1
try
if handles.delete_object_axes==hObject;
delete(hObject);
handles = rmfield(handles,'delete_object_axes');
else
set(handles.delete_object_axes,'linewidth',1);
set(hObject,'linewidth',2);
handles.delete_object_axes = hObject;
end
catch
if strcmp(get(hObject,'Type'),'line')
handles.delete_object_axes = hObject;
set(hObject,'linewidth',2);
guidata(gca, handles);
else
set(handles.delete_object_axes,'linewidth',1);
end
return;
end
guidata(gca, handles);
end