MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manuel d'utilisateur télécharger pdf (Page 248)

10 Examples of GUIDE GUIs

10-24

• Calls model_open to ensure that the Simulink model is open so that

simulation parameters can be set.

• Gets the new slider value.

• 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 KfValueSlider_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 the new value

% set by slider.

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

% Set the Gain parameter of the Kf Gain Block to the new value.

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

Note that, 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 a similar approach.

Current Value Edit Text Callback

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

When the user clicks on another component in the GUI after typing 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 typed in by the user).

If the value is in range, the slider

Value property is updated to the new value.

• Sets the appropriate block parameter to the new value (

set_param).

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manuel d'utilisateur Page 248

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