plot pause

Hello

I am using the following code to iteratively pan along the x-axis in small steps and it works fine.

asig = csvread('tek0001CH1.csv',15,0);
%tim =sig(1:1000000,1);
aamp = asig(1:2000000,2);
ts = asig(2,1) - asig(1,1);
tim = [0:2000000 - 1]*ts;
time = tim';
plot(time, aamp);

%set(h,'Motion','horizontal','Enable','on');
axis([0 max(tim) -0.1 1.9]);
ax_handle = gca;
    xlimit_orig = get(ax_handle, 'Xlim');
    win_xlimit = [0 0.001];
    offset = 0.001;

%   %Iterativley change the xlimit for the axes to pan across the figure

      while win_xlimit(2) <= xlimit_orig(2)
          set(ax_handle, 'Xlim', win_xlimit);
          pause(0.05);
          win_xlimit = win_xlimit + offset;

      end

However, if I want to stop in the middle of panning (If I see something of interest in the plot), how do I do it? I tried using waitforbuttonpress fcn and that doesn't work very well. Any suggestions please.

Thanks

Answer 1

[Jan]

You can use a toggle button:

buttonH = uicontrol('Sytle', 'ToggleButton', ...
             'Units',    'pixels', ...
             'Position', [5, 5, 60, 20], ...
             'String',   'Pan', ...
             'Value',    1);

while win_xlimit(2) <= xlimit_orig(2)
  set(ax_handle, 'Xlim', win_xlimit);
  pause(0.05);
  if get(buttonH, 'Value') == 1
    win_xlimit = win_xlimit + offset;
  end  
end

[vsee]

Thanks. I tried this. I just added

handle = uicontrol;

in my code and it added a push button in my plot. How can I make this interactive? Is there a property called pan for uicontrol

[Jan]

No, there is no 'pan' property. My example uses an interaction already. Therefore I do not understand your question.

[Fangjun Jiang]

Here is how it works out!

%%

ts=0.5;

tim = (0:2000000)*ts;

aamp=sin(tim);

h=figure(1);

plot(tim, aamp);

%set(h,'Motion','horizontal','Enable','on');

axis([0 max(tim) -1 1]);

buttonH = uicontrol('parent',h,...

'style', 'togglebutton', ...

'Units', 'pixels', ...

'Position', [5, 5, 60, 20], ...

'String', 'Pan', ...

'Value', 1);

ax_handle = gca;

xlimit_orig = get(ax_handle, 'Xlim');

win_xlimit = [0 10];

offset = 10;

% %Iterativley change the xlimit for the axes to pan across the figure

while win_xlimit(2) <= xlimit_orig(2)

set(ax_handle, 'Xlim', win_xlimit);

pause(0.05);

if get(buttonH, 'Value') == 1

win_xlimit = win_xlimit + offset;

end

end

[vsee]

Thanks much Fangjun and Jan. The panning works and am able to stop it by pressing the toggle button on the plot and can also add data cursors to the plot when paused. However, I can't zoom in or zoom out when paused. Is this something that I am going to have to live with?

[Fangjun Jiang]

Yes, you can. But need to move the set(ax_handle,...) line into the if statement. like below.

while win_xlimit(2) <= xlimit_orig(2)

pause(0.05);

if get(buttonH, 'Value') == 1

win_xlimit = win_xlimit + offset;

set(ax_handle, 'Xlim', win_xlimit);

end

end

[vsee]

Thanks again. That worked. Appreciate it.

Answer 2

[Fangjun Jiang]

Nice work! I recommend you making a generic function which includes mostly the code in your while-loop. This generic function can take some arguments and pan any axes in a figure. When you want to stop, just press Ctrl+C to stop the execution of the function. When you want to continue, you just run the function again.

Layout a list of the input arguments,such as the figure handle, axes handle, how fast you want it move, the initial xlimit, etc. I think it can be done.

[vsee]

Even if I had a function, how do I dynamically change the variable's value that I read from the keyboard, so that when the value changes, the plot begins to pan again.