MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 231)

GUI with Multiple Axes

10-7

• Making the appropriate axes current using the axes command and the

handle of the axes. For example,

axes(handles.frequency_axes)

• Issuing the plot command.

• Setting any properties that are automatically reset by the

plot command.

The last step is necessary because many plotting commands (including

plot)

clear the axes before creating the graph. This means you cannot use the

Property Inspector to set the

XMinorTick and grid properties that are used in

this example, since they are reset when the callback executes

plot.

When looking at the following code listing, note how the

handles structure is

used to access the handle of the axes when needed.

Plot Button Code Listing

function plot_button_Callback(hObject, eventdata, handles)

% hObject handle to plot_button (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Get user input from GUI

f1 = str2double(get(handles.f1_input,'String'));

f2 = str2double(get(handles.f2_input,'String'));

t = eval(get(handles.t_input,'String'));

% Calculate data

x = sin(2*pi*f1*t) + sin(2*pi*f2*t);

y = fft(x,512);

m = y.*conj(y)/512;

f = 1000*(0:256)/512;

% Create frequency plot

axes(handles.frequency_axes) % Select the proper axes

plot(f,m(1:257))

set(handles.frequency_axes,'XMinorTick','on')

grid on

% Create time plot

axes(handles.time_axes) % Select the proper axes

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 231