MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Betriebsanweisung PDF herunterladen (Seite 446)

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101

10 Examples of GUIDE GUIs

• Sets the value of the Current value edit text component to match the

slider.

• Sets the appropriate block parameter to the new value (

set_param).

Here is the callback for the Proportional (Kf) slider:

function KfValu eSli der_Callback(hObject, eventdata, handles)

% Ensure model is open.

model_open(handles)

% Get the new value for the Kf Gain from the slider.

NewVal = get(hObject, 'Value');

% Set the value of the KfCurrentValue to t he new value

% set by slider.

set(handles.KfCurrentValue,'String' ,NewVal)

% Set the Gain parameter of the Kf Gain B lock to the new value.

set_param('f14/Controller/Gain','Ga in',num2str(NewVal))

While a slider returns a number and the edit text requires a string, uicontrols

automatically convert the values to the correct type.

The callback for the Integral (Ki) slider follows an approach similar to th e

Proportional (Kf) slider’s callback.

Current Value Edit Text Callback

The edit text box enables users to enter a value for the respective parameter.

When the user clicks another component in the GUI after entering data into

the text box, the edit text callback executes the following steps:

• Calls

model_open to ensure that the Simulink model is open so that it can

set simulation parameters.

• Converts the string returned by the edit box

String property to a double

(

str2double).

• Checks whether the value entered by the user is within the range of the

slider:

If the value is out of range, the edit text

String property is set to the value

of the slider (rejecting the number entered by the user).

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