MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 63)

Programming the GUI

3-15

end

The next topic, “Programming the Push Buttons” on page 3-15, shows you how

to write callbacks for the three push buttons.

Programming 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);

end

function contourbutton_Callback(source,eventdata)

% Display contour plot of the currently selected data.

contour(current_data);

end

The next topic shows you how to associate each of the callbacks you’ve created

with its specific component.

Associating Callbacks with Their Components

When the GUI user selects a data set from the pop-up menu or clicks one of the

push buttons, MATLAB executes the callback associated with that particular

event. But how does MATLAB know which callback to execute? You must use

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 63