MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 192)

8 Programming the GUI

8-20

function pushbutton1_Callback(hObject, eventdata, handles)

display Goodbye

delete(handles.figure1);

Adding an Image to a Push Button or Toggle Button

To add an image to a push button or toggle button, assign the button’s CData

property an m-by-n-by-3 array of RGB values that defines a truecolor image.

For example, the array

a defines 16-by-64 truecolor image using random values

between 0 and 1 (generated by

rand).

a(:,:,1) = rand(16,64);

a(:,:,2) = rand(16,64);

a(:,:,3) = rand(16,64);

set(hObject,'CData',a)

To add the image when the button is created, add the code to the button’s

CreateFcn callback. You may want to delete the value of the button’s String

property, which would usually be used as a label.

See

ind2rgb for information on converting a matrix X and corresponding

colormap map, i.e., an

(X, MAP) image, to RGB (truecolor) format.

Toggle Button

The callback for a toggle button needs to query the toggle button to determine

what state it is in. MATLAB sets the

Value property equal to the Max property

when the toggle button is pressed (

Max is 1 by default) and equal to the Min

property when the toggle button is not pressed (

Min is 0 by default).

The following code illustrates how to program the callback in the GUI M-file.

function togglebutton1_Callback(hObject, eventdata, handles)

button_state = get(hObject,'Value');

if button_state == get(hObject,'Max')

% Toggle button is pressed-take approperiate action

...

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Strona 192