Zoom in Zoom out axes with button function

excuse me, i have a question. how to make a button function to zoom in and zoom out an axes ?, please someone help me.

[Walter Roberson]

How closely does it need to model the existing zoom behavior? In particular the existing behavior needs to keep track of the entire history of zoom in and out so that the user can "undo" one zoom at a time. It is this tracking that complicates the function.

[Lidank Abiel]

sorry for late reply. I get code for zooming image in axes and using a slider for zoom in zoom out the image. When i run it, it work fine, but when i put that code to my application, it not work.

this is the code sir :

 function varargout = zoomtest(varargin)
 gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @zoomtest_OpeningFcn, ...
                   'gui_OutputFcn',  @zoomtest_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

 if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
 else
    gui_mainfcn(gui_State, varargin{:});
 end

 function zoomtest_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to zoomtest (see VARARGIN)

 % Choose default command line output for zoomtest
 handles.output = hObject;

 % Read in standard MATLAB demo image.
 grayImage = imread('football.jpg');
 axes(handles.axesImage);
 imshow(grayImage, []);
 title('Original Grayscale Image');

 % Set up zoom slider
 minZoom = get(handles.sldZoom, 'min')
 maxZoom = get(handles.sldZoom, 'max')
 set(handles.sldZoom, 'value', minZoom);
 % set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.

 % Update handles structure
 guidata(hObject, handles);

 function sldZoom_Callback(hObject, eventdata, handles)
 % hObject    handle to sldZoom (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA) 

 % Hints: get(hObject,'Value') returns position of slider
 % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

 zoomFactor = get(hObject,'Value');
 axes(handles.axesImage);
 zoom('out');
 zoom(zoomFactor);
 txtInfo = sprintf('Zoom Factor = %.2f (%d %%)\n\nOnce zoomed, you can pan  by clicking and dragging in the image.', zoomFactor, round(zoomFactor * 100));
 set(handles.txtInfo, 'String', txtInfo);
 txtInfo = sprintf('Zoom Factor = %.2f\n\nOnce zoomed, you can pan by   clicking and dragging in the image.', zoomFactor); 
 set(handles.sldZoom, 'TooltipString', txtInfo);
 txtZoom = sprintf('Zoom Factor = %.2f (%d %%)',     zoomFactor,round(zoomFactor * 100));
 set(handles.txtZoom, 'String', txtZoom);

 set(handles.axesImage, 'ButtonDownFcn', 'disp(''This executes'')');
 set(handles.axesImage, 'Tag', 'DoNotIgnore');
 h = pan;
 set(h, 'ButtonDownFilter', @myPanCallbackFunction);
 set(h, 'Enable', 'on');
 return;

 function [flag] = myPanCallbackFunction(obj, eventdata)
 % If the tag of the object is 'DoNotIgnore', then return true.
 % Indicate what the target is
 disp(['In myPanCallbackFunction, you clicked on a ' get(obj,'Type')  'object.'])
 objTag = get(obj, 'Tag');
 if strcmpi(objTag, 'DoNotIgnore')
 flag = true;
 else
 flag = false;
 end
 return;

 % --- Executes during object creation, after setting all properties.
 function sldZoom_CreateFcn(hObject, eventdata, handles)
 % hObject    handle to sldZoom (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    empty - handles not created until after all CreateFcns called

 % Hint: slider controls usually have a light gray background. 
 if isequal(get(hObject,'BackgroundColor'),  get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
 end

[Walter Roberson]

What happens when you try it?

[Lidank Abiel]

sorry for late again Mr.walter, but i've found the answer. thank you before :)

Answer 1

[Sean de Wolski]

I would just add the predefined ZOOM buttons to the toolbar of the figure. There's no reason to reinvent the wheel.

In GUIDE:

Tools Menu -> Toolbar editor