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