MATLAB Creating Graphical User Interfaces

9 Examples of GUIDE UIs

ex_guide_timergui_OpeningFcn

ex_guide_timergui_OpeningFcn creates the timer using the following code:

handles.timer = timer(...

'ExecutionMode', 'fixedRate', ... % Run timer repeatedly

'Period', 1, ... % Initial period is 1 sec.

'TimerFcn', {@update_display,hObject}); % Specify callback

The opening function also initializes the slider Min, Max, and Value properties, and sets

the slider label to display the value:

set(handles.periodsldr,'Min',0.01,'Max',2)

set(handles.periodsldr,'Value',get(handles.timer('Period'))

set(handles.slidervalue,'String',...

num2str(get(handles.periodsldr,'Value')))

A call to surf renders the peaks data in the axes, adding the surfaceplot handle to the

handles structure:

handles.surf = surf(handles.display,peaks);

Finally, a call to guidata saves the handles structure contents:

guidata(hObject,handles);

startbtn_Callback

startbtn_Callback calls timer start method if the timer is not already running:

if strcmp(get(handles.timer, 'Running'), 'off')

start(handles.timer);

end

stopbtn_Callback

stopbtn_Callback calls the timer stop method if the timer is currently running:

if strcmp(get(handles.timer, 'Running'), 'on')

stop(handles.timer);

end

periodsldr_Callback

periodsldr_Callback is called each time you move the slider. It sets the timer period

to the slider current value after removing unwanted precision:

% Read the slider value