MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Betriebsanweisung PDF herunterladen (Seite 485)

100

101

Time Data Updates from a GUI (GUIDE)

update_display

update_display is the callback for the timer object. It adds Gaussian noise to

the

ZData ofthesurfaceplot:

handles = guidata(hfigure);

Z = get(handles.surf,'ZData');

Z = Z + 0.1*randn(size(Z));

set(handles.surf,'ZData',Z);

Because update_display is not a GUIDE-generated callback, it does not

include

handles as one of its calling arguments. Instead, it accesses the

handles structure by calling

guidata. The callback gets the ZData of the

surface plot from the

handles.surf member of the structure. It modifies

the Z matrix by adding noise using

randn, and then resets the ZD ata of the

surface plot with the modified data. It does not modify the handles structure.

Note Nothing prevents you from adding the h andles structure as an

argument to a non-GUIDE-generated callback, such as

update_display.

However, the handles data the callback receives is a static copy which does

not change when other parts of your code update

handles by calling guidata.

For this reason, the

update_display callback calls guidata to get a fresh

copy of

handles each time it executes.

figure1_CloseRequestFcn

MATLAB calls the figur e1_CloseRequestFcn when you click the close box of

the GUI. The callback cleans up the application before it exits, stopping and

deleting the timer object and then deleting the figure window.

% Necessary to provide this fu nction to prevent timer callback

% from causing an error after GUI code stops executing.

% Before exiting, if the timer is running, stop it.

if strcmp(ge t(ha ndles.timer, 'Runni ng') , 'on')

stop(handles.timer);

end

% Destroy timer

delete(handles.timer)

% Destroy figure

delete(hObject);

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