Matlab - PowerPoint Presentation

Slide1

Matlab GUIs

GUIDESlide2

Laying out the GUI

Use GUIDESlide3

OpeningFcn

GUIDE is going to create a function called ‘

NameofGUI_OpeningFcn

’

This function takes 4 variables, in this order

Handle to figure (

hObject

)

e

ventdata

, which is not used

A structure called

handles

v

arargin

, command line arguments to the GUISlide4

OpenFcn

is the initialization function, and is where you would place basic information & global variables

For 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

)Slide5

Handles

guidata(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);Slide6

get and set

get – used to query handle graphics object properties

Useful in GUIs to figure out if radio buttons are on or off for example

s

et – used to set handle graphics object properties

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

handle

structure Slide7

GUIDE

Use 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 componen

tSlide8

Available Components

(look at guide)Slide9

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.Slide10

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 focusSlide11

Panels and Button Groups

u

ipanel

: Panels arrange GUI components into groups, making the interface easier to understand.

ph =

uipanel(fh,'PropertyName',PropertyValue

,...

)

u

ibuttongroup

:

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

bgh

=

uibuttongroup

(fh,'PropertyName

',PropertyValue

,...) Slide12

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

uicontrolSlide13

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]);Slide14

Menu Bars

u

imenu

: 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')Slide15

Reading in SAC data

Example we will look at is

speedyseis

The sac reader in this case is a script (not a function) called

get_sac

, which sets variables

filename

n

pts

s

ampdelta

d

ate

h

our

m

inu

s

eco

dataSlide16

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_sacSlide17

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

);Slide18

handles.fulldatend

=

length(handles.fulldata

);

handles.datstart

=1;

handles.datend

=

handles.fulldatalen

;

p

lotitall

%function defined later in the script

guidata(hObject

, handles)

;

%standard last line in a function in which

handles%have

been set or revisedSlide19

Available Components

axes: 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])

;Slide20

uicontrol

Check 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])

;Slide21

u

icontrol

List boxes display items and enable users to select one or more items

lbh

=

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]);Slide22

u

icontrol

Push buttons generate an action when clicked

pbh

=

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]);Slide23

u

icontrol

Sliders 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]);Slide24

u

icontrol

Toggle 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

]);Slide25

u

itable

: 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

)