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    function varargout = page221(varargin)
% PAGE221 M-file for page221.fig
%      PAGE221, by itself, creates a new PAGE221 or raises the existing
%      singleton*.
%
%      H = PAGE221 returns the handle to a new PAGE221 or the handle to
%      the existing singleton*.
%
%      PAGE221('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in PAGE221.M with the given input arguments.
%
%      PAGE221('Property','Value',...) creates a new PAGE221 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before page221_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to page221_OpeningFcn via varargin.
%
%      *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 page221

% Last Modified by GUIDE v2.5 30-May-2005 16:29:30

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @page221_OpeningFcn, ...
                   'gui_OutputFcn',  @page221_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(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 page221 is made visible.
function page221_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 page221 (see VARARGIN)

% Choose default command line output for page221
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes page221 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = page221_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 during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (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 popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (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,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
f = str2double(get(handles.edit1,'String'));

fm = 1000;

N = 1024;

n = 0:N-1;

x2 = n/fm;

val1 = get(handles.popupmenu1,'Value');

switch val1

case 1

    x = -0.04:0.001:0.04;

    y1 = sin(2*pi*f*x);

    y2 = sin(2*pi*f*x2);

case 2

    x = -0.06:0.0001:0.06;

    y1 = square(2*pi*f*x,50);

    y2 = square(2*pi*f*x2,50);

case 3

    x = -0.15:0.001:0.15;

    y1 = sawtooth(2*pi*f*x);

    y2 = sawtooth(2*pi*f*x2);

case 4

    x = [-5:0.01:5];

    y1 = [(x-0) >= 0];

case 5

    x = [-5:0.01:5];

    y1 = [(x-0) == 0];

case 6

    x = [-2:0.01:2];

    y1 = sinc(f*pi*x);

otherwise

    y1 = 0;

end



axes(handles.axes1) % Select the proper axes

plot(x,y1,'-r')

set(handles.axes1,'XMinorTick','on')

title('时域波形');

grid on



y = fft(y2,N);

mag = abs(y);

fs=(0:length(y)-1)'*fm/length(y);



axes(handles.axes2) % Select the proper axes

plot(fs,mag,'-b')

axis([0 100 0 300]);

set(handles.axes2,'XMinorTick','on')

title('频域波形');

grid on

% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close
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