Specifications

5 Application Examples
5-32
•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 varargout = KfValueSlider_Callback(h,eventdata,handles,varargin)
% Ensure model is open
model_open(handles)
% Get the new value for the Kf Gain from the slider
NewVal = get(h,'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).
Here is the callback for the Kf
Current value text box.
function varargout = KfCurrentValue_Callback(h,eventdata,handles,varargin)
% Ensure model is open