MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 59)

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101

Create a Simple UI Programmatically

3-7

Value property to the index of the selected string. The pop-up menu callback reads the

pop-up menu Value property to determine which item is currently displayed and sets

current_data accordingly.

Add the following callback to your file following the initialization code and before the

final end statement.

% Pop-up menu callback. Read the pop-up menu Value property to

% determine which item is currently displayed and make it the

% current data. This callback automatically has access to

% current_data because this function is nested at a lower level.

function popup_menu_Callback(source,eventdata)

% Determine the selected data set.

str = source.String;

val = source.Value;

% Set current data to the selected data set.

switch str{val};

case 'Peaks' % User selects Peaks.

current_data = peaks_data;

case 'Membrane' % User selects Membrane.

current_data = membrane_data;

case 'Sinc' % User selects Sinc.

current_data = sinc_data;

end

Program the Push Buttons

Each of the three 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 plot the data

in current_data. They automatically have access to current_data because they are

nested at a lower level.

Add the following callbacks to your file following the pop-up menu callback and before

the final end statement.

% Push button callbacks. Each callback plots current_data in the

% specified plot type.

function surfbutton_Callback(source,eventdata)

% Display surf plot of the currently selected data.

surf(current_data);

end

function meshbutton_Callback(source,eventdata)

% Display mesh plot of the currently selected data.

mesh(current_data);

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