MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manuale Utente Scaricare il pdf (Pagina 56)

3 Creating a GUI Programmatically

3-8

These statements use the uicontrol function to create the push buttons.

Each statement uses a series of property/value pairs to define a push button.

Each call returns the handle of the component that is created.

2 Add the pop-up menu and its label to your GUI by adding these statements

to the M-file following the push button definitions.

hpopup = uicontrol('Style','popupmenu',...

'String',{'Peaks','Membrane','Sinc'},...

'Position',[300,50,100,25]);

htext = uicontrol('Style','text','String','Select Data',...

'Position',[325,90,60,15]);

For the pop-up menu, the String property uses a cell array to specify the

three items in the pop-up menu:

Peaks, Membrane, Sinc. The static text

component serves as a label for the pop-up menu. Its

String property tells

the GUI user to

Select Data. Default units for these components are pixels.

3 Add the axes to the GUI by adding this statement to the M-file. Set the

Units property to pixels so that it has the same units as the other

components.

ha = axes('Units','pixels','Position',[50,60,200,185]);

4 Align all components except the axes along their centers with the following

statement. Add it to the M-file following all the component definitions.

align([hsurf,hmesh,hcontour,htext,hpopup],'Center','None');

Property Description

Style

In the example, pushbutton specifies the component as a

push button.

String

Specifies the label that appears on each push button.

Here, there are three types of plots:

Surf, Mesh, Contour.

Position

Uses a 4-element vector to specify the location of each

push button within the GUI and its size: [distance from

left, distance from bottom, height, width]. Default units

for push buttons are pixels.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manuale Utente Pagina 56