最近在做gui，底子太烂了，怎么看都不懂。在这发一个看到的例子，希望得到各位高手的指点
谢谢啦~~
红色部分是要问的
还有handles的用法是什么，就是具体语句中的用法？
function varargout = mygui(varargin)
%MYGUI M-file for mygui.fig
% MYGUI, by itself, creates a new MYGUI or raises the existing
% singleton*.
%
% H = MYGUI returns the handle to a new MYGUI or the handle to
% the existing singleton*.
%
% MYGUI('Property','Value',...) creates a new MYGUI using the
% given property value pairs. Unrecognized properties are passed via
% varargin to mygui_OpeningFcn. This calling syntax produces a
% warning when there is an existing singleton*.
%
% MYGUI('CALLBACK') and MYGUI('CALLBACK',hObject,...) call the
% local function named CALLBACK in MYGUI.M with the given input
% arguments.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help mygui
% Last Modified by GUIDE v2.5 18-Aug-2007 10:11:06
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @mygui_OpeningFcn, ...
'gui_OutputFcn', @mygui_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
% End initialization code - DO NOT EDIT
% --- Executes just before mygui is made visible.
function mygui_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 unrecognized PropertyName/PropertyValue pairs from the
% command line (see VARARGIN)
handles.peaks=peaks(35); 这段是什么用处？所有要用的函数都要在这定义吗？
handles.membrane=membrane;
[x,y] = meshgrid(-8:.5:8);
r = sqrt(x.^2+y.^2) + eps;
sinc = sin(r)./r;
handles.sinc = sinc; handles。sinc=sinc是说sinc的句柄是sinc的函数吗？
handles.current_data = handles.peaks;
surf(handles.current_data);
% Choose default command line output for mygui
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes mygui wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.function varargout = mygui_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on button press in surf_pushbutton.
function surf_pushbutton_Callback(hObject, eventdata, handles)
% hObject handle to surf_pushbutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
surf(handles.current_data); 这句是什么意思啊？
% --- Executes on button press in mesh_pushbutton.
function mesh_pushbutton_Callback(hObject, eventdata, handles)
% hObject handle to mesh_pushbutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
mesh(handles.current_data);
% --- Executes on button press in contour_pushbutton.
function contour_pushbutton_Callback(hObject, eventdata, handles)
% hObject handle to contour_pushbutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
contour(handles.current_data);这两句都是，不明白% --- Executes on selection change in popup.
function popup_Callback(hObject, eventdata, handles)
% hObject handle to popup (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = get(hObject,'String') returns popup contents as cell array
% contents{get(hObject,'Value')} returns selected item from popup
val = get(hObject,'Value');
str = get(hObject, 'String');
switch str{val};
case 'peaks' % User selects peaks
handles.current_data = handles.peaks;
case 'membrane' % User selects membrane
handles.current_data = handles.membrane;
case 'sinc' % User selects sinc
handles.current_data = handles.sinc;
end
guidata(hObject,handles)
% --- Executes during object creation, after setting all properties.
function popup_CreateFcn(hObject, eventdata, handles)
% hObject handle to popup (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: popupmenu controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --------------------------------------------------------------------
function surf_menu_Callback(hObject, eventdata, handles)
% hObject handle to surf_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
surf(handles.current_data);
% --------------------------------------------------------------------
function mesh_menu_Callback(hObject, eventdata, handles)
% hObject handle to mesh_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%mesh(handles.current_data);
mesh_pushbutton_Callback(hObject, eventdata, handles);
% --------------------------------------------------------------------
function contour_menu_Callback(hObject, eventdata, handles)
% hObject handle to contour_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
contour(handles.current_data);
% --------------------------------------------------------------------
function closef_menu_Callback(hObject, eventdata, handles)
% hObject handle to closef_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
close(gcf);
% --------------------------------------------------------------------
function box_menu_Callback(hObject, eventdata, handles)
% hObject handle to box_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if strcmp(get(gcbo, 'Checked'),'on')
set(gcbo, 'Checked', 'off');
else
set(gcbo, 'Checked', 'on');
end
box;
% --------------------------------------------------------------------
function grid_menu_Callback(hObject, eventdata, handles)
% hObject handle to grid_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if strcmp(get(gcbo, 'Checked'),'on')
set(gcbo, 'Checked', 'off');
else
set(gcbo, 'Checked', 'on');
end
grid;
% --------------------------------------------------------------------
function context_menu_Callback(hObject, eventdata, handles)
% hObject handle to context_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
function close_Callback(hObject, eventdata, handles)
% hObject handle to close (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
function choose_menu_Callback(hObject, eventdata, handles)
% hObject handle to choose_menu (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)