MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung PDF herunterladen (Seite 205)

Examples: Programming GUI Components

8-33

3 View the ActiveX Properties with the Property Inspector. Select the control

in the Layout Editor, and then select

Property Inspector from the View

menu or by clicking the Property Inspector icon .

The following figure shows the properties of the

mwsamp ActiveX control as

they appear in the Property Inspector.

The ActiveX control

mwsamp has just two properties:

Label, which contains the text that appears at the top of the control

Radius, the default radius of the circle, which is 20

4 Add the following code to the mswamp control’s Click callback. This code

programs the ActiveX control to change the circle radius when the user

clicks the circle, and updates the label to display the new radius.

hObject.radius = .9*hObject.radius;

hObject.label = ['Radius = ' num2str(hObject.radius)];

refresh(handles.figure1);

To locate the Click callback in the GUI M-file, select View Callbacks from

the

View menu and then select Click.

5 Add the following commands to the opening function. This code initializes

the label when you first open the GUI.

handles.activex1.label = ...

['Radius = ' num2str(handles.activex1.radius)];

Now, when you open the GUI and click the ActiveX control, the radius of the

circle is reduced by 10 percent and the new value of the radius is displayed. The

following figure shows the GUI after clicking the circle six times.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung Seite 205