完成GUI的畫面程式!

要使前述之介面可以執行，必須先將程式起始化，然後才能順利使用，其中必須考慮下述幾項：

所用單位必須正規化，以取得大小一致。這可利用'Units'屬性宣告為 'normalized'之狀態。此時所有元件均會隨GUI圖面之大小呈比例變化。正規化之單位其圖會以左下角為視窗的(0,0)點，而右上角則落在(1.0,1.0)之上。其餘要做的事項則包括：

• 產生繪圖所需之資料。本例中需要三組資料：peaks_data, membrane_data與 sinc_data。每組資料必須與跳出式選單之項目匹配。
• 在圖軸上顯示起始圖表。
• 將此介面賦于一名稱，此名稱會在視窗之上方標題格出現。
• 將介面視窗移至螢幕之中央。
• 打開 GUI介面顯示開關。

依據上述各點，程式中尚需增加的部份如下：

     % Initialize the GUI.
     % Change units to normalized so components resize automatically.
     set([f,hsurf,hmesh,hcontour,htext,hpopup],'Units','normalized');
     % Generate the data to plot.
     peaks_data = peaks(35);
     membrane_data = membrane;
     [x,y] = meshgrid(-8:.5:8);
     r = sqrt(x.^2+y.^2) + eps;
     sinc_data = sin(r)./r;
     % Create a plot in the axes.
     current_data = peaks_data;
     surf(current_data);
     % 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');

綜合前節之內容，完整個的GUI程式如下，可以存檔後直接執行：

    function simple_gui2
    % 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 hide the GUI figure as it is being constructed.
    f = figure('Visible','off','Position',[360,500,450,285]);
     
    % Construct the components
    hsurf = uicontrol('Style','pushbutton','String','Surf',...
             'Position',[315,220,70,25]);
    hmesh = uicontrol('Style','pushbutton','String','Mesh',...
             'Position',[315,180,70,25]);
    hcontour = uicontrol('Style','pushbutton',...
             'String','Countour',...
             'Position',[315,135,70,25]);
    htext = uicontrol('Style','text','String','Select Data',...
             'Position',[325,90,60,15]);
    hpopup = uicontrol('Style','popupmenu',...
             'String',{'Peaks','Membrane','Sinc'},...
             'Position',[300,50,100,25]);
    ha = axes('Units','Pixels','Position',[50,60,200,185]);
    align([hsurf,hmesh,hcontour,htext,hpopup],'Center','None');
     
    % Create the data to plot
    peaks_data = peaks(35);
    membrane_data = membrane;
    [x,y] = meshgrid(-8:.5:8);
    r = sqrt(x.^2+y.^2) + eps;
    sinc_data = sin(r)./r;
     
    % Initialize the GUI.
    % Change units to normalized so components resize
    % automatically.
    set([f,hsurf,hmesh,hcontour,htext,hpopup],...
              'Units','normalized');
    %Create a plot in the axes.
    current_data = peaks_data;
    surf(current_data);
    % 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');

 end

執行結果如下圖：

(編譯及圖示摘自mathworks.com)

不過，執行看看，按鍵時並沒有動靜，是不是錯了呢？