Updating a figure in a GUI pops up a new figure, what's wrong?

Question

FX 2016-8-12

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此问题的直接链接

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回答： FX 2016-8-13

I am trying to make a program that displays live chart data from a broker once in a period. The period could be for example 5 seconds or 15 minutes.

I have made a GUI and a Timer but always when the program starts all the updated candles comes to new figure (only one) but not into the figure in the GUI.

Attached is some code:

This is in the openingFcn of the GUI .m-file

handles.timer = timer(...
    'ExecutionMode', 'fixedRate', ...   % Run timer repeatedly
    'Period', 5, ...                % Initial period is 5 sec.
    'TimerFcn', {@updateChart,hObject}); % Specify callback
guidata(hObject, handles);
start(handles.timer);
% Choose default command line output for OAPIGUI
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);

And this is the updateChart callback funtion:

function updateChart(hObject,eventdata,hfigure)
    % Get new data, one candle at a time
    [ openBid, openAsk, highBid, highAsk, lowBid, lowAsk, ... 
    closeBid, closeAsk, volume] = ...
    DataExtract(GetHistory('EUR_USD', 'S5', '1'));
    handles = guidata(hfigure);
    % How many times the chart has already updated
    k = handles.timer.TasksExecuted
    % Populate the beginnings of the vectors with NaNs to draw the newest
    % candle on the right spot on the chart.
    highBid = [NaN(k,1) ; highBid];
    lowBid = [NaN(k,1) ; lowBid];
    closeBid = [NaN(k,1) ; closeBid];
    openBid = [NaN(k,1) ; openBid];
    axes(handles.axes1);      
    candle(highBid, lowBid, closeBid, openBid);
    hold on;

I have read https://se.mathworks.com/matlabcentral/answers/102384-how-do-i-make-my-gui-plot-into-an-axes-within-the-gui-figure-rather-than-inside-of-a-new-figure-in-m but I'm still getting a new figure. The first candle goes to the GUI's figure which is strange.

No matter which plotting command I use, the problem can be reproduced with just the 'plot' command, for instance.

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Answer 1

FX 2016-8-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/299396-updating-a-figure-in-a-gui-pops-up-a-new-figure-what-s-wrong#answer_231631

I got the question answered succesfully at Stackoverflow. Here is the url: http://stackoverflow.com/questions/38890375/updating-chart-in-a-gui-with-timer-creates-a-new-figure-axes

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Answer 2

Adam 2016-8-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/299396-updating-a-figure-in-a-gui-pops-up-a-new-figure-what-s-wrong#answer_231563

在 MATLAB Online 中打开

'candle' looks like a very old function and does not seem to have a version that allows you to plot on a specified axes, but plot certainly does so e.g.

plot( hAxes, xData, yData )

is what you should always use rather than

axes( hAxes )
plot( xData, yData );

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FX 2016-8-13

编辑：FX 2016-8-13

Well this works partially with plot, thank you. But still a new figure is popping up even that the data is going to the right figure. When I close that figure manually it pops up again during the next timer execution.

Also, how about the function highlow which can return a handle but does not take one as an input argument, can I somehow use the handle it returns to draw on the axes on the GUI?

Maybe I should give some feedback to Matlab about the candle function that it should take axes as an input.

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