function createGui(this)

%Makes the fit name have the first letter capitalized
fit_name=[upper(this.fit_name(1)),this.fit_name(2:end)];

%Defines the colors for the Gui
rgb_blue=[0.5843-0.4,0.8157-0.4,1];
rgb_white=[1,1,1];

%Width of the edit boxes in the GUI
edit_width=120;

%Name sets the title of the window, NumberTitle turns off the FigureN text
%that would otherwise be before the title, MenuBar is the menu normally on
%the figure, toolbar is the toolbar normally on the figure.
%HandleVisibility refers to whether gcf, gca etc will grab this figure.
this.Gui.Window = figure('Name', 'MyFit', 'NumberTitle', 'off', ...
    'MenuBar', 'none', 'Toolbar', 'none', 'HandleVisibility', 'off',...
    'Units','Pixels','Position',[500,500,edit_width*this.n_params,400]);
%Sets the close function (runs when x is pressed) to be class function
set(this.Gui.Window, 'CloseRequestFcn',...
    @(hObject,eventdata) closeFigure(this, hObject,eventdata));
%The main vertical box. The four main panes of the GUI are stacked in the
%box. We create these four boxes first so that we do not need to redraw
%them later
this.Gui.MainVbox=uix.VBox('Parent',this.Gui.Window,'BackgroundColor','w');
%The title box
this.Gui.Title=annotation(this.Gui.MainVbox,'textbox',[0.5,0.5,0.3,0.3],...
    'String',fit_name,'Units','Normalized',...
    'HorizontalAlignment','center','VerticalAlignment','middle',...
    'FontSize',16,'BackgroundColor',rgb_white);
%Displays the fitted equation
this.Gui.Equation=annotation(this.Gui.MainVbox,'textbox',[0.5,0.5,0.3,0.3],...
    'String',this.fit_tex,...
    'Units','Normalized','Interpreter','LaTeX',...
    'HorizontalAlignment','center','VerticalAlignment','middle',...
    'FontSize',20,'BackgroundColor',rgb_white);
%Creates an HBox for extracted parameters and user interactions with GUI
this.Gui.UserHbox=uix.HBox('Parent',this.Gui.MainVbox,'BackgroundColor',rgb_white);

%Creates the HBox for the fitting parameters
this.Gui.FitHbox=uix.HBox('Parent',this.Gui.MainVbox);

%Sets the heights and minimum heights of the four vertical boxes. -1 means
%it resizes with the window
set(this.Gui.MainVbox,'Heights',[40,-1,-1,100],'MinimumHeights',[40,80,50,100]);

%Here we create the save panel in the GUI.
this.Gui.SavePanel=uix.BoxPanel( 'Parent', this.Gui.UserHbox,...
    'Padding',0,'BackgroundColor', rgb_white,...
    'Title','Save Panel','TitleColor',rgb_blue);
%Here we create the panel for the useful parameters
this.Gui.UserPanel=uix.BoxPanel( 'Parent', this.Gui.UserHbox,...
    'Padding',0,'BackgroundColor', 'w',...
    'Title','Calculated parameters','TitleColor',rgb_blue);

%This makes the buttons that go inside the savepanel
this.Gui.SaveVbox=uix.VBox('Parent',this.Gui.SavePanel,'BackgroundColor',...
    rgb_white);
this.Gui.SaveButton=uicontrol('Parent',this.Gui.SaveVbox,...
    'style','pushbutton','Background','w','String','Save Fit');
set(this.Gui.SaveVbox,'Heights',[25]);

this.Gui.UserVbox=uix.VBox('Parent',this.Gui.UserPanel,'BackgroundColor',...
    rgb_white);
switch this.fit_name
    case 'exponential'
        this.Gui.QHbox=uix.HBox('Parent',this.Gui.UserVbox,...
            'BackgroundColor',rgb_white);
        this.Gui.FreqLabel=annotation(this.Gui.QHbox,'textbox',[0.5,0.5,0.3,0.3],...
            'String','Frequency (MHz)','Units','Normalized',...
            'HorizontalAlignment','center','VerticalAlignment','middle',...
            'FontSize',10,'BackgroundColor',rgb_white);

        this.Gui.EditFreq=uicontrol('Parent',this.Gui.QHbox,...
            'Style','edit','String',1,'HorizontalAlignment','Right',...
            'FontSize',10,'Tag','EditFreq');
        set(this.Gui.QHbox,'Widths',[-4,-2]);
        set(this.Gui.UserVbox,'Heights',[25]);
end

%We first make the BoxPanels to speed up the process. Otherwise everything
%in the BoxPanel must be redrawn every time we make a new one.
panel_str=cell(1,this.n_params);
for i=1:this.n_params
    %Generates the string for the panel handle
    panel_str{i}=sprintf('panel_%s',this.fit_params{i});
    %Creates the panels
    this.Gui.(panel_str{i})=uix.BoxPanel( 'Parent', this.Gui.FitHbox ,...
        'Padding',0,'BackgroundColor', 'w',...
        'Title',sprintf('%s (%s)',this.fit_param_names{i},this.fit_params{i}),...
        'TitleColor',rgb_blue);
end

%Loops over number of parameters to create a fit panel for each one
for i=1:this.n_params
    %Generates the string for the vbox handle
    vbox_str=sprintf('vbox_%s',this.fit_params{i});
    %Generates the string for the slider handle
    slider_str=sprintf('slider_%s',this.fit_params{i});
    %Generates string for edit panels
    edit_str=sprintf('edit_%s',this.fit_params{i});
    
    %Creates the vbox inside the panel that allows stacking
    this.Gui.(sprintf('vbox_%s',this.fit_params{i})) =uix.VBox( 'Parent', ...
        this.Gui.(panel_str{i}),'Padding',0,'BackgroundColor', 'w');
    
    %Generates edit box for fit parameters
    this.Gui.(edit_str)=uicontrol('Parent',this.Gui.(vbox_str),...
        'Style','edit','String',sprintf('%3.3e',this.init_params(i)),...
        'FontSize',14,'Tag',edit_str,'HorizontalAlignment','Right',...
        'Callback',...
        @(hObject,eventdata) edit_Callback(this, hObject, eventdata));
    %Generates java-based slider. Looks nicer than MATLAB slider
    this.Gui.(sprintf('slider_%s',this.fit_params{i}))=...
        uicomponent('Parent',this.Gui.(vbox_str),'style',...
        'jslider','pos',[0,0,95,45],'Value',72,'Orientation',0,...
        'MajorTickSpacing',20,'MinorTickSpacing',5,...
        'Paintlabels',0,'PaintTicks',1,'Value',50,'Background',...
        java.awt.Color.white);
    
    %Sets up callbacks for the slider
    this.Gui.([slider_str,'_callback'])=handle(this.Gui.(slider_str),...
        'CallbackProperties');
    this.Gui.([slider_str,'_callback']).StateChangedCallback = ....
        @(hObject, eventdata) slider_Callback(this,i,hObject,eventdata);
    %Sets heights and minimum heights for the elements in the fit vbox
    set(this.Gui.(vbox_str),'Heights',[30,55],'MinimumHeights',[30,55])
end

end