範例一：執行各繪圖

利用GUI介面執行程式，最簡單的方式是使用GUIDE之輔助畫面，首先執行GUIDE指令如下，然後選擇空白畫面：

>>guide



將上面圖形準備妥當，並將跳出式選單中之string參數加入下列選項：

  'plot(x)', 'pie(x)', 'hist(y)', 'ezplot3(f)',...
  'polar(theta,r)','area(x,y)'

由圖面先執行，設其檔案為demo3.m，並令其自動產生該檔案，如下述：
其中黃色部份為另外添者。

function varargout = demo3(varargin)
% DEMO3 M-file for demo3.fig
%      DEMO3, by itself, creates a new DEMO3 or raises the existing
%      singleton*.
%
%      H = DEMO3 returns the handle to a new DEMO3 or the handle to
%      the existing singleton*.
%
%      DEMO3('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in DEMO3.M with the given input arguments.
%
%      DEMO3('Property','Value',...) creates a new DEMO3 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before demo3_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to demo3_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 demo3

% Last Modified by GUIDE v2.5 04-Jan-2007 10:02:38

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                 'gui_Singleton',  gui_Singleton, ...
                 'gui_OpeningFcn', @demo3_OpeningFcn, ...
                 'gui_OutputFcn',  @demo3_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 demo3 is made visible.
function demo3_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 demo3 (see VARARGIN)

% Choose default command line output for demo3
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes demo3 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
if strcmp(get(hObject,'Visible'),'off')
  plot(rand(5));
end

% --- Outputs from this function are returned to the command line.
function varargout = demo3_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 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 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 && isequal(get(hObject,'BackgroundColor'),
  get(0,'defaultUicontrolBackgroundColor'))
  set(hObject,'BackgroundColor','white');
end

set(hObject, 'String', {'plot(x)', 'pie(x)', 'hist(y)', 'ezplot3(f)',...
  'polar(theta,r)','area(x,y)'});

% --- 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)
axes(handles.axes1);
cla;

popup_sel_index = get(handles.popupmenu1, 'Value');
switch popup_sel_index
  case 1
      plot(rand(5));
  case 2
      n=round(10*rand)+10;
      pie(2:4:n);
  case 3
      hist(randn(1000,1));
  case 4
      ezplot3('t*sin(t)', 'cos(t)', 't', [0,6*pi])
  case 5
      theta = linspace(0, 2*pi);
      polar(theta, 3+2*rand*cos(4*theta));
  case 6
      y=[1 1.2 1.5 2*rand;4 4.5 6.6 7*rand;5 6.5 8 15*rand]';
      area([1980 1990 2000 2008],y);
      grid on;colormap cool;
    
end


% --------------------------------------------------------------------
function OpenMenuItem_Callback(hObject, eventdata, handles)
% hObject    handle to OpenMenuItem (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
file = uigetfile('*.fig');
if ~isequal(file, 0)
  open(file);
end

% --------------------------------------------------------------------
function PrintMenuItem_Callback(hObject, eventdata, handles)
% hObject    handle to PrintMenuItem (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
printdlg(handles.figure1)


% --------------------------------------------------------------------
function CloseMenuItem_Callback(hObject, eventdata, handles)
% hObject    handle to CloseMenuItem (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
selection = questdlg(['Close ' get(handles.figure1,'Name') '?'],...
                   ['Close ' get(handles.figure1,'Name') '...'],...
                   'Yes','No','Yes');
if strcmp(selection,'No')
  return;
end

delete(handles.figure1)

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

不用Guide輔助之程式寫法

 function simple_guix
   % SIMPLE_GUI Select a data set from the pop-up menu, then
   % click one of the plot-type push buttons. Clicking the button
   % plots the selected data in the axes.

      %  Create and then hide the GUI as it is being constructed.
      f = figure('Visible','off','Position',[360,500,450,285]);

      %  Construct the components.
      h1 = uicontrol('Style','pushbutton','String','開始',...
             'Position',[315,220,70,25],...
             'Callback',{@startbutton_Callback});
      htext = uicontrol('Style','text','String','請選擇繪圖指令:',...
             'Position',[325,90,60,15]);
      hpopup = uicontrol('Style','popupmenu',...
             'String',{'plot(x)', 'pie(x)', 'hist(y)', 'ezplot3(f)',...
             'polar(theta,r)','area(x,y)'},...
             'Position',[300,50,100,25],...
             'Callback',{@popup_menu_Callback});
      ha = axes('Units','Pixels','Position',[50,60,200,185]);
  
      % Initialize the GUI.
      % Change units to normalized so components resize
      % automatically.
      set([f,ha,h1,htext,hpopup],'Units','normalized');
      %Create a first plot in the axes.
      plot(rand(5));
      currentfig='plot(x)';
      % Assign the GUI a name to appear in the window title.
      set(f,'Name','Simple GUI')
      % Move the GUI to the center of the screen.
      movegui(f,'center')
      % Make the GUI visible.
      set(f,'Visible','on');

      %  Callbacks for simple_gui.
      %  the current data.
      function popup_menu_Callback(source,eventdata)
      % Determine the selected data set.
          str = get(source, 'String');
          val = get(source,'Value');
          currentfig=cell2mat(str(val));
      end
 
      % Push button callbacks. Each callback plots current_data in
      % the specified plot type.

      function startbutton_Callback(source,eventdata)
      % Display surf plot of the currently selected data.
      % Set current data to the selected data set.
            switch currentfig;
              case 'plot(x)' % User selects plot.
                plot(rand(5));
              case 'pie(x)' % User selects pie.
                n=round(10*rand)+10;
                pie(2:4:n);
              case 'hist(y)' % User selects hist
                hist(randn(1000,1));
              case 'ezplot3(f)' % User selects ezplot
                ezplot3('t*sin(t)', 'cos(t)', 't', [0,6*pi])
              case 'polar(theta,r)' % User selects polar
                theta = linspace(0, 2*pi);
                polar(theta, 3+2*rand*cos(4*theta));               
              case 'area(x,y)' % User selects area
                y=[1 1.2 1.5 2*rand;4 4.5 6.6 7*rand;5 6.5 8 15*rand]';
                area([1980 1990 2000 2008],y);
                grid on;colormap cool;
            end

      end


   end