Matlab GUIsGUIDE

Laying out the GUI

Use GUIDE

OpeningFcnGUIDE is going to create a function called

‘NameofGUI_OpeningFcn’

This function takes 4 variables, in this orderHandle to figure (hObject)eventdata, which is not usedA structure called handlesvarargin, command line arguments to the GUI

OpenFcn is the initialization function, and is where you would place basic information & global variablesFor example, for simple_gui all of the original data

set up falls under OpenFcn

% Create the data to plot.

handles.peaks=peaks(35);

handles.membrane=membrane;

[x,y] = meshgrid(-8:.5:8);

r = sqrt(x.^2+y.^2) + eps;

sinc = sin(r)./r;

handles.sinc = sinc;

% Set the current data value.

handles.current_data = handles.peaks;

surf(handles.current_data)

Handlesguidata(object_handle,data)

stores the variable data as GUI data Object_handle is usually the parent figure Data can be any MATLAB variable but is usually a

structure called handle when using GUIDE

If you modify the handle you have to resave it using guidata Following on previous slide

% Set the current data value.

handles.current_data = handles.peaks;

surf(handles.current_data)

% Update handles structure

guidata(hObject, handles);

get and setget – used to query handle graphics object

propertiesUseful in GUIs to figure out if radio buttons are on or

off for example

set – used to set handle graphics object properties

Frequently used set the ‘String’ portion of the variables in the handle structure

GUIDEUse the GUIDE interface to move components

around

To design the components, you open Property Inspector from the ‘View’ drop-down menu ‘String’ is used to change the text associated with

the component ‘Tag’ is used to control the name of the Callback

function associated with the component

Available Components(look at guide)

Kinds of Callbacks (incomplete list)

ButtonDownFcn – executes when the GUI user presses a mouse button while the pointer is on or near a component or figure

Callback – Control action. Executes when a user clicks a push button or selects a menu item

ClickedCallback – Control action. Executes when the push tool or toggle tool is clicked.

CreateFcn – Initializes the component when a function creates it.

DeleteFcn – Performs cleanup operations just before a component or figure is destroyed.

KeyPressFcn – Executes when the user presses a keyboard key and the callbacks’s component or figure as focus

Panels and Button Groupsuipanel: Panels arrange GUI components into

groups, making the interface easier to understand.

ph = uipanel(fh,'PropertyName',PropertyValue,...)

uibuttongroup: Button groups are like panels but are used to manage exclusive selection behavior for radio buttons and toggle buttons

bgh = uibuttongroup(fh,'PropertyName',PropertyValue,...)

Panels and button groups are containers that arrange GUI components into groups.

If you move the panel or button group, its children move with it and maintain their positions relative to the panel or button group.

The panel or button group become the handle on calls to uicontrol

ph = uipanel('Parent',fh,'Title','My Panel',... 'Position',[.25 .1 .5 .8]);

pbh1 = uicontrol(ph,'Style','pushbutton','String','Button 1',... 'Units','normalized',... 'Position',[.1 .55 .8 .3]);

pbh2 = uicontrol(ph,'Style','pushbutton','String','Button 2',... 'Units','normalized',... 'Position',[.1 .15 .8 .3]);

Menu Barsuimenu: add a menu bar (ie. File, Edit, View, etc)

mh = uimenu(parent,'PropertyName',PropertyValue,...)

Example:

mh = uimenu(fh,'Label','My menu');

eh1 = uimenu(mh,'Label','Item 1');

eh2 = uimenu(mh,'Label','Item 2','Checked','on');

seh1 = uimenu(eh1,'Label','Choice 1','Accelerator','C',...

'Enable','off');

seh2 = uimenu(eh1,'Label','Choice 2','Accelerator','H')

Reading in SAC dataExample we will look at is speedyseis

The sac reader in this case is a script (not a function) called get_sac, which sets variables

filenamenptssampdeltadatehourminusecodata

Speedyseis is written in GUIDE

It has a pushbutton called ‘Get Sac file’, which has the following callback

% --- Executes on button press in getSACfilebutton.

function getSACfilebutton_Callback(hObject, eventdata, handles)

global hObject handles

%get_sac reads sac file and puts data into workspace of calling program/routine

%uses SAC_file_prompt for prompt, if it does not exist - uses default prompt

% SAC_file_prompt='Select a SAC file';

get_sac

Next we set some handles

handles.filename=filename;

handles.samprate=round(1/sampdelta);

samprate_str=num2str(handles.samprate);

set(handles.sampratedisplay,'String',samprate_str);

handles.delt=1/handles.samprate;

handles.fulldata=data;

handles.fulldatalen=length(handles.fulldata);

handles.fulldatend=length(handles.fulldata);

handles.datstart=1;

handles.datend=handles.fulldatalen;

plotitall %function defined later in the script

guidata(hObject, handles); %standard last line in a function in which

handles%have been set or revised

Available Componentsaxes: Axes enable your GUI to display graphics

such as graphs and images using commands such as: plot, surf, line, bar, polar, pie, contour, and mesh.

ah = axes('Parent',fh,'Position',[.15 .15 .7 .7]);

uicontrolCheck boxes can generate an action when

checked and indicate their state as checked or not checked.

cbh = uicontrol(fh,'Style','checkbox',...

'String','Display file extension',...

'Value',1,'Position',[30 20 130 20])

Edit text components are fields that enable users to enter or modify text strings.

eth = uicontrol(fh,'Style','edit',...

'String','Enter your name here.',...

'Position',[30 50 130 20]);

uicontrolList boxes display items and enable users to select

one or more itemslbh = uicontrol(fh,'Style','listbox',...

'String',{'one','two','three','four'},...

'Value',1,'Position',[30 80 130 20]);

Pop-up menus (drop down menus) open to display a list of choices

pmh = uicontrol(fh,'Style','popupmenu',...

'String',{'one','two','three','four'},...

'Value',1,'Position',[30 80 130 20]);

uicontrolPush buttons generate an action when clickedpbh = uicontrol(fh,'Style','pushbutton','String','Button 1',...

'Position',[50 20 60 40]);

Radio buttons are similar to check boxes, but are typically mutually exclusive within a group of related radio buttons. Use button groups to manage related radio buttons

rbh = uicontrol(fh,'Style','radiobutton',...

'String','Indent nested functions.',...

'Value',1,'Position',[30 20 150 20]);

uicontrolSliders accept numeric input within a specified

range by enabling the user to move a sliding bar

sh = uicontrol(fh,'Style','slider',...

'Max',100,'Min',0,'Value',25,...

'SliderStep',[0.05 0.2],...

'Position',[30 20 150 30]);

Static text controls display lines of text; typically used to label other controls

sth = uicontrol(fh,'Style','text',...

'String','Select a data set.',...

'Position',[30 50 130 20]);

uicontrolToggle buttons generate an action and indicate

whether they are turned on or off.

tbh = uicontrol(fh,'Style','togglebutton',...

'String','Left/Right Tile',...

'Value',0,'Position',[30 20 100 30]);

uitable: Callbacks are fired when table cells are selected or edited. Tables can be made to be user editable.

th = uitable(fh,'Data',magic(5));

tpos= get(th,'Position’)

texn= get(th,'Extent’)

tpos(3) = texn(3);

tpos(4) = texn(4);

set(th, 'Position’, tpos)