Gibt es eine Möglichkeit, Sekunden und Millisekunden in einem Bearbeitungsfeld anzuzeigen?

Question

Ich versuche einen Countdown mit einem Timer in einer GUI/Matlab zu programmieren. Die GUI wird mit Guide erstellt. Meine Idee ist es, zwei Bearbeitungsfelder zu haben, wobei eine Box mit einer Zeit im Format ss: ms (z.B. 50.200) gefüllt werden kann. Durch Drücken der Start-Taste sollte der Countdown im zweiten Eingabefeld angezeigt und ausgeführt werden. Mein Problem im Moment, ich kann nur die Sekunden und nicht die Milliseconds in der zweiten Bearbeitungsbox zeigen. Ich habe versucht sprintf - aber ich denke, dass der Handle "TasksToExecute" aus dem Timer keine Dezimalzahlen akzeptiert ?!

Kann jemand helfen? Oder hat jemand eine Idee, wie zu lösen?

Danke.

 function varargout = Countdown_test(varargin) 
%  COUNTDOWN_TEST MATLAB code for Countdown_test.fig 
%  COUNTDOWN_TEST, by itself, creates a new COUNTDOWN_TEST or raises the existing 
%  singleton*. 
% 
%  H = COUNTDOWN_TEST returns the handle to a new COUNTDOWN_TEST or the handle to 
%  the existing singleton*. 
% 
%  COUNTDOWN_TEST('CALLBACK',hObject,eventData,handles,...) calls the local 
%  function named CALLBACK in COUNTDOWN_TEST.M with the given input arguments. 
% 
%  COUNTDOWN_TEST('Property','Value',...) creates a new COUNTDOWN_TEST or raises the 
%  existing singleton*. Starting from the left, property value pairs are 
%  applied to the GUI before Countdown_test_OpeningFcn gets called. An 
%  unrecognized property name or invalid value makes property application 
%  stop. All inputs are passed to Countdown_test_OpeningFcn via varargin. 
% 
%  *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one 
%  instance to run (singleton)". 
% 
% See also: GUIDE, GUIDATA, GUIHANDLES 

% Edit the above text to modify the response to help Countdown_test 

% Last Modified by GUIDE v2.5 23-Jan-2017 14:47:18 

% Begin initialization code - DO NOT EDIT 
gui_Singleton = 1; 
gui_State = struct('gui_Name',  mfilename, ... 
        'gui_Singleton', gui_Singleton, ... 
        'gui_OpeningFcn', @Countdown_test_OpeningFcn, ... 
        'gui_OutputFcn', @Countdown_test_OutputFcn, ... 
        'gui_LayoutFcn', [] , ... 
        'gui_Callback', []); 
if nargin && ischar(varargin{1}) 
    gui_State.gui_Callback = str2func(varargin{1}); 
end 

if nargout 
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); 
else 
    gui_mainfcn(gui_State, varargin{:}); 
end 
% End initialization code - DO NOT EDIT 


% --- Executes just before Countdown_test is made visible. 
function Countdown_test_OpeningFcn(hObject, eventdata, handles, varargin) 
% This function has no output args, see OutputFcn. 
% hObject handle to figure 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 
% varargin command line arguments to Countdown_test (see VARARGIN) 

% Choose default command line output for Countdown_test 
handles.output = hObject; 

% Update handles structure 
guidata(hObject, handles); 

% UIWAIT makes Countdown_test wait for user response (see UIRESUME) 
% uiwait(handles.Countdown_test); 


countdown_timer = timer; 
set(countdown_timer,'ExecutionMode','fixedrate'); 
set(countdown_timer,'Period',1.0); 
set(countdown_timer,'TimerFcn',{@countdowntimercallback,handles}); 

% Store the timer in the GUI so it persists for the life of the GUI 
setappdata(handles.Countdown_test, 'Countdown_timer', countdown_timer); 


fileName = 'state.mat'; 

if exist(fileName) 

    load(fileName) 
    set(handles.ed_PS_Time,'String',state.PST); 

    delete(fileName); 
end 



% --- Outputs from this function are returned to the command line. 
function varargout = Countdown_test_OutputFcn(hObject, eventdata, handles) 
% varargout cell array for returning output args (see VARARGOUT); 
% hObject handle to figure 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

% Get default command line output from handles structure 
varargout{1} = handles.output; 



function ed_countdown_Callback(hObject, eventdata, handles) 
% hObject handle to ed_countdown (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

% Hints: get(hObject,'String') returns contents of ed_countdown as text 
%  str2double(get(hObject,'String')) returns contents of ed_countdown as a double 


% --- Executes during object creation, after setting all properties. 
function ed_countdown_CreateFcn(hObject, eventdata, handles) 
% hObject handle to ed_countdown (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles empty - handles not created until after all CreateFcns called 

% Hint: edit controls usually have a white background on Windows. 
%  See ISPC and COMPUTER. 
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) 
    set(hObject,'BackgroundColor','white'); 
end 

set(hObject,'String',''); 


% --- Executes on button press in pb_start. 
function pb_start_Callback(hObject, eventdata, handles) 
% hObject handle to pb_start (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

countdown_timer = getappdata(handles.Countdown_test,'Countdown_timer'); 

anzahl=str2num(get(handles.ed_PS_Time,'String')); 
sprintf('%0.3f',anzahl); 
set(countdown_timer,'TasksToExecute',anzahl); 

start(countdown_timer); 

set(handles.ed_countdown, 'Enable','off'); 

durchlaeufe=get(countdown_timer,'TasksToExecute'); 
setappdata(handles.Countdown_test,'Durchlauf',durchlaeufe); 



function countdowntimercallback(obj,~,handles) 

countdown_timer = getappdata(handles.Countdown_test,'Countdown_timer'); 

durchlaeufe_aktuell=get(countdown_timer,'TasksExecuted'); 

durchlaeufe = getappdata(handles.Countdown_test,'Durchlauf'); 


Countdown = durchlaeufe - durchlaeufe_aktuell; 
sprintf('%0.3f',Countdown); 
set(handles.ed_countdown,'String',Countdown); 

% --- Executes on button press in pb_stop. 
function pb_stop_Callback(hObject, eventdata, handles) 
% hObject handle to pb_stop (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

% handles.ed_PS_Time = str2num(get(handles.ed_PS_Time, 'String')); 
% guidata(hObject,handles); 
countdown_timer = getappdata(handles.Countdown_test,'Countdown_timer'); 
stop(countdown_timer); 



function ed_PS_Time_Callback(hObject, eventdata, handles) 
% hObject handle to ed_PS_Time (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

% Hints: get(hObject,'String') returns contents of ed_PS_Time as text 
%  str2double(get(hObject,'String')) returns contents of ed_PS_Time as a double 

% --- Executes during object creation, after setting all properties. 
function ed_PS_Time_CreateFcn(hObject, eventdata, handles) 
% hObject handle to ed_PS_Time (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles empty - handles not created until after all CreateFcns called 

% Hint: edit controls usually have a white background on Windows. 
%  See ISPC and COMPUTER. 
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) 
    set(hObject,'BackgroundColor','white'); 
end 

set(hObject,'String','0'); 




% --- Executes when user attempts to close Countdown_test. 
function Countdown_test_CloseRequestFcn(hObject, eventdata, handles) 
% hObject handle to Countdown_test (see GCBO) 
% eventdata reserved - to be defined in a future version of MATLAB 
% handles structure with handles and user data (see GUIDATA) 

% Hint: delete(hObject) closes the figure 
saveState(handles) 
delete(hObject); 

function saveState(handles) 

state.PST = get(handles.ed_PS_Time, 'String'); 

save('state.mat','state') 
} 

Answer 1

Im Rahmen eines Countdown-Timer, ist TasksToExecute nicht ein besonders nützlicher Wert für sich allein. Der Wert, an dem Sie interessiert sind, ist Ihr timer Objekt Period.

Zum Beispiel:

function honktimer 
% Set up dummy GUI 
h.mainfig = figure('MenuBar', 'none', 'ToolBar', 'None'); 
h.totaltimelbl = uicontrol('Style', 'text', 'Units', 'Normalized', ... 
    'Position', [0.05, 0.80, 0.40, 0.05], 'String', 'Countdown Time (ss.ss)'); 
h.totaltimeeb = uicontrol('Style', 'edit', 'Units', 'Normalized', ... 
    'Position', [0.05, 0.70, 0.40, 0.10], 'String', '1.0'); 
h.periodlbl = uicontrol('Style', 'text', 'Units', 'Normalized', ... 
    'Position', [0.55, 0.80, 0.40, 0.05], 'String', 'Update Rate (Hz)'); 
h.periodbox = uicontrol('Style', 'edit', 'Units', 'Normalized', ... 
    'Position', [0.55, 0.70, 0.40, 0.10], 'String', '10'); 
h.cdlbl = uicontrol('Style', 'text', 'Units', 'Normalized', ... 
    'Position', [0.30, 0.55, 0.40, 0.05], 'String', 'Time Remaining (ss.SS)'); 
h.cdbox = uicontrol('Style', 'edit', 'Units', 'Normalized', ... 
    'Position', [0.30, 0.45, 0.40, 0.10], 'String', '', 'Enable', 'inactive'); 
h.sb = uicontrol('Style', 'pushbutton', 'Units', 'Normalized', ... 
    'Position', [0.30, 0.30, 0.40, 0.10], 'String', 'Start Timer'); 
h.sb.Callback = @(p,e)starttimer(h); % Set callback here so h is fully populated 
end 

function starttimer(h) 
% Set up the timer 
UpdateRate = str2double(h.periodbox.String); % Update rate, Hz 
countdowntime = datetime(h.totaltimeeb.String, 'InputFormat', 'ss.SS'); % Convert countdown time to datetime object 
nupdates = fix(countdowntime.Second*UpdateRate); % Calculate number of timer iterations 
countdown = timer('BusyMode', 'drop', 'ExecutionMode', 'fixedRate', ... 
    'Period', 1/UpdateRate, 'StartDelay', 0, 'TasksToExecute', nupdates, ... 
    'StartFcn', @(p,e)startcountdown(h), ... % Execute on timer start 
    'TimerFcn', @(p,e)updatecountdown(p, h) , ... % Execute each timer update 
    'StopFcn', @(p,e)endcountdown(h)); % Execute when timer ends 

start(countdown); % Start the timer! 
end 

function startcountdown(h) 
h.cdbox.String = h.totaltimeeb.String; 
end 

function updatecountdown(timerobj, h) 
currtime = datetime(h.cdbox.String, 'InputFormat', 'ss.SS'); 
tickduration = seconds(timerobj.Period); 
newtime = currtime - tickduration; 
h.cdbox.String = sprintf('%.2f', newtime.Second); 
end 

function endcountdown(h) 
h.cdbox.String = 'Honk'; 
end 

die uns eine grundlegende GUI gibt:

Hier gehen wir davon aus, dass der Timer, Subtrahieren alle Period Sekunden (0.001 Sekunden minimale Auflösung ist) führt Period Sekunden von dem, was gerade im Countdown-Feld angezeigt wird, und Aktualisieren der Zeichenfolge. Für einen robusteren Ansatz habe ich datetime und seconds verwendet, um sicherzustellen, dass die Zeiten genau wie angegeben dargestellt werden, im Gegensatz zur Annahme, dass der Countdown-String Dezimalsekunden ist und str2double oder ähnliches verwendet.

Sie auch mit dem Ansatz der Speicherung der Gesamtzeit als timer Objekts UserData und Berechnen der Zeit an jedem TimerFcn Anruf basierend auf der Zielzeit, Period und die TasksExecuted Eigenschaft gehen könnte.

---

Die üblichen Einschränkungen für Programmiertimer gelten. Wir gehen davon aus, dass das timer Objekt TimerFcn mehr oder weniger pünktlich aufgerufen wird. Die Dokumentation für timer geht in ein kleines Detail über die Ausführung in der Beschreibung für die ExecutionMode Eigenschaft.