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Pop-Up Menu


A very simple example to show how the pop-up menu / Drop down list in MATLAB works.



MATLAB CODE:
function Popup_menu
global filename Img  I T;
scz=get(0,'ScreenSize');

figure('Position',[round(scz(1,3)/4) round(scz(1,4)/8) 800 500],'MenuBar','None','NumberTitle','off','Name','PopUpMenu Example','Resize','off');
axes('Position',[0 0 .7 1],'xtick',[],'ytick',[]);

directory=dir('*.jpg');
files={directory.name}';

%Get the File Name
%Position =[X Y length width]
uicontrol('style','text','Position',[565,453 60 20]','String','Filename:');
%The file names are the options here.
uicontrol('Style','popupmenu','position',[628 445 170 30],'Value',1,'String',files,'Callback',@displayfile);

%Select the Conversion type
uicontrol('style','text','Position',[565,415 90 20]','String','Image 
Conversion:');

%The options for image conversion are : Original Image, Convert to grayscale,
Convert to binary, Edge detected Image.
uicontrol('Style','popupmenu','position',[565 375 200 30],'Value',1,'String',{'Convert to GrayScale','Convert to Binary','Original Image','Edge detected Image'},'Callback',@convert);

%Select the edge type
T=uicontrol('Style','popupmenu','position',[565 305 200 30],'Value',1,'String',{'Canny','Sobel','Prewitt','log'},'callback',@findedge);
F=uicontrol('style','text','Position',[565,345 90 20]','String','Edge Type:');

%These components can be made visible or invisible
set(T,'Visible','off');
set(F,'Visible','off');

function displayfile(obj,eve)
        ptr=get(obj,'value');
        filename=char(files(ptr));
        Img=imread(filename);
        imshow(Img);
end

%Switch case
%Value 1 performs the conversion of the orginal image to grayscale image
%Value 2 performs the conversion of the orginal image to binary image
%Value 3 shows the orginal image
%Value 4 performs the edge detection of the image based on the type.




    function convert(obj,eve)
        ptr=get(obj,'value');
        switch ptr
            case {1}
                set(T,'Visible','off');
                set(F,'Visible','off');
                I=rgb2gray(Img);
                imshow(I);
            case {2}
                set(T,'Visible','off');
                set(F,'Visible','off');
                I=im2bw(Img);
                imshow(I);
            case {3}
                set(T,'Visible','off');
                set(F,'Visible','off');
                imshow(Img);
            case {4}
            set(T,'Visible','on');
            set(F,'Visible','on');
   
                           
        end
    end

                                                              
                                                             
                                                              


                                      
                                 
                                      
                                     


       
  %To perform edge detection based on the type
    function findedge(obj,event)
            ptr=get(obj,'value');
            B=rgb2gray(Img);
            switch ptr
                case {1}
                    imshow(~edge(B,'canny'));
                case {2}
                    imshow(~edge(B,'sobel'));
                case {3}
                    imshow(~edge(B,'Prewitt'));
                case {4}
                    imshow(~edge(B,'log'));
                   
            end
           
           
        end
               
   
end




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