MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador descarregar pdf (Página 41)

100

101

Programming the GUI

2-21

% 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)

The first six executable lines create the data using the MATLAB functions

peaks, membrane and sinc. They store the data in the handles structure,

which is passed as an argument to all callbacks. Callbacks for the push

buttons can retrieve the data from the

handles structure.

The last two lines create a current data value and set it to peaks, and then

display the surf plot for peaks. The following figure shows how the GUI now

looks when it first displays.

Programming the Pop-Up Menu

The pop-up menu enables users to select the data to plot. When a user selects

one of the three plots, MATLAB sets the pop-up menu

Value property to the

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