Question

我有一个GUI，它从* .xls文件导入数据并绘制图形。我不能做的最后一件事是刷新数据，因为我的xls文件每15秒更新一次。我希望我的GUI每20秒更新一次输入数据。我怎样才能做到这一点？而且我想要一个能够暂停/运行数据更新的按钮。

    function viewSTUEP
global hPlot hChoice raw
  handles.F = figure('Name','viewSTUEP', 'Position',[100 20 900 550], ...
    'Color',[0.8 0.8 0.8], 'NumberTitle','off', 'Resize','off');
   uicontrol('Style','pushbutton', 'Position',[690 510 94 30], ...
    'FontSize',12, 'String','Load', 'Callback',@LoadData);
   uicontrol('Style','pushbutton', 'Position',[790 510 94 30], ...
    'FontSize',12, 'String','Save plot', 'Callback',@SaveAs);
  uicontrol('Style', 'pushbutton', 'Position', [690 475 94 30], ...
    'FontSize',12, 'String','Update', 'Callback',@UpdatePlot);
  uicontrol('Style','pushbutton', 'Position',[790 475 94 30], ...
    'FontSize',12, 'String','Close', 'Callback',{@Close,handles});
  set(handles.F, 'CloseRequestFcn', {@Close,handles})
  set(gcf, 'Toolbar', 'figure');
  clear raw, raw(1,:) = {''};
  hPlot = axes('Position',[0.06 0.08 0.68 0.9], 'Visible','on');
  uicontrol('Style','text', 'Position',[690 432 130 35], ...
    'BackgroundColor',[0.8 0.8 0.8], 'FontSize',12, ...
    'HorizontalAlignment','left', 'String','Columns for plot:');
  hChoice = uicontrol('Style','listbox', 'Position',[690 420 204 22], ...
    'FontSize',12, 'String',raw(1,:), 'Min',1, 'Max',1);

function Close(hObject, eventdata, handles)
delete(handles.F);

function LoadData(hObject, eventdata)
global hChoice raw xdat
  [fname, pname] = uigetfile('*.xls','Select a data file');
  if fname ~= 0
    filename = strcat(pname, fname);
    [numeric,text,raw] = xlsread(filename);
    num = length(raw(1,:));
    if (num > 21) num = 21; end
    posY = 442 - (20*num);
    set(hChoice, 'String',raw(1,:));
    set(hChoice, 'Max',num);
    set(hChoice, 'Position',[690 posY 204 (20*num)]);
    xdat = datenum(0,0,0,0,0,cell2mat(raw(2:end,6)));
  end

function UpdatePlot(hObject, eventdata)
global hPlot hChoice raw xdat
  if ~isempty(raw)
    cols = get(hChoice,'Value'); 
    plot(hPlot, xdat,cell2mat(raw(2:end,cols(1))), 'LineWidth',2), datetick('x','HH:MM')
    grid on
    if (length(cols) > 1)
      colors = 'brgcmyk'; c = 2;
      hold(hPlot, 'on')
      for k = cols(2:end)
        plot(hPlot, xdat,cell2mat(raw(2:end,k)),colors(c),'LineWidth',2)
        c = c+1; if (c > 7) c = 1; end
      end
      hold(hPlot, 'off')
    end
    legend(hPlot, raw(1,cols), 'Interpreter','none','Location','SouthEast')
    xlabel(hPlot, 'Time in minutes:');
    ylabel(hPlot, 'Temperature in C:');
  end 

 function SaveAs(hObject, eventdata, handles)
         [Save,savename] = uiputfile('*.eps','Save plot as: ')
         fname=fullfile(savename,Save);
         print('-depsc','-r300','-noui',fname)

Answer 1

我认为您应该使用计时器对象 - see here

更新输入数据MatLAB

1 个答案: