Updat GUI plot with new data

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Stijn Hillenius
Stijn Hillenius 2017-3-21
评论： Stijn Hillenius 2017-4-6
Dear all,
I have created a GUI that needs to update once a second in such a way that we see a moving wave. My code is triggerd by a Timer:
ind1 =obj.plot_Timestamp(1,1); % left boundary plot
ind2 =obj.plot_Timestamp(1,2); % right boundary plot
axes(obj.handle_GUI_1); %get acces to my GUI for ploting
plot(obj.x,obj.y1,'--r',obj.x,obj.y2,'b'); %plot a calculated wave and a forecasted wave
title('Wave Elevation [m]');
xlabel('Time [s]');
xlim([ind1 ind2]); % my left and right boundary to be shown in my plot changing every sec.
ylim([-2 2]);
legend('RAO','HSC');
drawnow;
When I start the simulation, the plot is created in my GUI but instead of updating my GUI it starts ploting in a new figure after the first update ( so after 1 sec I get a new figure with my moving wave opened on top of my GUI).
I have tried several things but nothing seems to help.
Anyone an idea how to fix this?
Thx in advanced
stijn

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采纳的回答

Jan
Jan 2017-3-21
LineH = plot(1:10, rand(1, 10));
TimerH = timer('TimerFcn', {@myTimerCallback, LineH}, ...
'ExecutionMode', 'fixedRate', ...
'Period', 1.0);
start(TimerH);
function myTimerCallback(TimerH, EventData, LineH)
OldYData = get(LineH, 'YData');
NewYData = OldYData + rand(size(OldYData)) * 0.1;
drawnow;
I do not understand what the "obj" is in your code. This is thought as an example of how to use the handle of a line for updating. Of course you could provide the handle of the axes object instead.
Especially in a timer callback it is safer to specify the 'Parent' property in the plot command: Otherwise the user can confuse Matlab by clicking on another object.
plot(obj.x,obj.y1,'--r',obj.x,obj.y2,'b', 'Parent', AxesH);
If you update the line's XData and YData only, there is no need to create the the title, xlabel and legend again.
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Stijn Hillenius
Stijn Hillenius 2017-3-28
Thank you! instead of redrawing the plot it is now refreshing the data! Below find my code:
if isempty( obj.hLine ) % Create plot first time: wave elevation
obj.hLine = plot(obj.handle_GUI_1,obj.timeH,obj.zeta,'--r',obj.timeH,obj.zetaH,'b'); %plot wave elevation
legend(obj.handle_GUI_1,'RAO','H');
title(obj.handle_GUI_1,'Wave Elevation [m]');
xlabel(obj.handle_GUI_1,'Time [s]');
else %refresh data and axes
obj.hLine.obj.timeH = obj.timeH;
obj.hLine.obj.zeta = obj.zeta;
obj.hLine.obj.timeH = obj.timeH;
obj.hLine.obj.zetaH = obj.zetaH;
xlim(obj.handle_GUI_1,[ind1 ind2]);
ylim(obj.handle_GUI_1,[-2 2]);
drawnow;
end
Stijn Hillenius
Stijn Hillenius 2017-4-6
Question B:
Now i got the plot moving, but so are my axis. I would like to keep my axis fixed, independent from the plot. That is, I would like my axis to tell me the relative distance to a certain point from 'Now' = 0. Therefore i would like my axis to state for instance: [ 0 30 60 90 120 ]. I am trying as follows but not succeeding:
set(gca,'xticklabel',{'Now','100','200','300','400'})
Anyone an idea how to fix this?

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