MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manuel d'utilisateur télécharger pdf (Page 44)

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2 How to Create a UI with GUIDE

2-20

This code first retrieves two pop-up menu properties:

• String — a cell array that contains the menu contents

• Value — the index into the menu contents of the selected data set

The code then uses a switch statement to make the selected data set the current

data. The last statement saves the changes to the handles structure.

% Determine the selected data set.

str = get(hObject, 'String');

val = get(hObject,'Value');

% Set current data to the selected data set.

switch str{val};

case 'peaks' % User selects peaks.

handles.current_data = handles.peaks;

case 'membrane' % User selects membrane.

handles.current_data = handles.membrane;

case 'sinc' % User selects sinc.

handles.current_data = handles.sinc;

end

% Save the handles structure.

guidata(hObject,handles)

Code Push Button Behavior

Each of the push buttons creates a different type of plot using the data specified by

the current selection in the pop-up menu. The push button callbacks get data from the

handles structure and then plot it.

Display the Surf push button callback in the MATLAB Editor. In the Layout Editor,

right-click the Surf push button, and then select View Callbacks > Callback.

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