As Doug said in comment 7, by default some of the high-level graphics functions (including image) clear many of the properties of the axes. You can restore those properties after calling IMAGE (as Doug suggested) or you can SET the axes NextPlot property to ‘replacechildren’ before calling IMAGE.

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/axes_props.html#NextPlot

A similar type of problem, but with PLOT and the Tag property instead of IMAGE and the ButtonDownFcn property, is described in this document on our support website; the solution is the same.

http://www.mathworks.com/support/solutions/data/1-168SX.html

It works now, thanks : )!

Lorraine

When you call the image command, capture the handle to that, then get the parent.

Doug

Thanks, but how can i do that?
I tried to get the new axes by

h = findobj(handles.Visible_iamge,…),but it returned nothing

Lorraine

Some of the graphics functions create a new axes and replace the old one. In doing this, the old callbacks, and certain other attributes are removed. You need to set them again.

Doug

I try to use ButtonDownFcn to get information about image pixels in the current figure. The function works well before the image showed in axes, but after the image loading into the axes, the ButtonDownFcn does not work.

here is the code

%%%%%
function pushbutton_input_vimage_Callback(hObject, eventdata, handles)

[vname,vpath]=uigetfile(’*.bmp; *.img; *.jpg; *.tif’);
vimage=[vpath vname];
handles.user.plot_vimage=imread(vimage);

axes(handles.Visible_iamge)

image(handles.user.plot_vimage)

guidata(hObject, handles);

%%%%%
function popupmenu_vpoints_Callback(hObject, eventdata, handles)

if get(hObject, ‘value’)==2
handles.mouse_track=2;

elseif get(hObject, ‘value’)==3
handles.mouse_track=3;

elseif get(hObject, ‘value’)==4
handles.mouse_track=4;

end

guidata(hObject, handles);

%%%%
function Visible_iamge_ButtonDownFcn(hObject, eventdata, handles)
handles.mouse_pos_fig=get(handles.figure1,’currentpoint’);
axes_area=get(handles.Visible_iamge,’position’);

if (handles.mouse_pos_fig(1)(axes_area(1))) && …
(handles.mouse_pos_fig(2)(axes_area(2)))
handles.mouse_pos=get(hObject,’currentpoint’);
else
handles.mouse_pos=-1;
end

b=handles.mouse_pos(1,1:2);

if handles.mouse_track==2
set(handles.text_A,’string’,int2str(b));
elseif handles.mouse_track==3
set(handles.text_B,’string’,int2str(b));
elseif handles.mouse_track==4
set(handles.text_C,’string’,int2str(b));
end

guidata(hObject,handles);

I have done this kind of thing before, it does require some advanced maneuvers. Mostly it is about using ASSIGNIN to redefine a variable in the workspace as you modify it graphically. You need to place that function call in the end of the callback that modifies the data.

-Doug

If it cant be used to do this, then what function allows me to drag data points from a plot and modify the graph (and the new data) on the fly.

Thanks

Zach

‘buttonDownFcn’ is spelled wrong in the above code.

Doug

function[] = graphinteract

figure(1)
plot(peaks)
set(gca,’buttondwnfcn’, @clicker)

function clicker(gcbo,eventdata,handles)
disp(get(gca,’Currentpoint’))

However, I always get the following error…

??? There is no ‘buttondwnfcn’ property in the ‘axes’ class.

Error in ==> graphinteract at 5
set(gca,’buttondwnfcn’, @clicker)

Any idea what I am doing wrong?