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From: muzaffar on 5 May 2008 10:18
thanks for the email and concern.
could you please tell me why i am unable to get values for
variable outdd? in the following program.
i can get and plot scroll wheel up/down movement with time
let say but i am unable to get array values in the end.
plz use hold on at command line after calling to the
function below.


function outdd= scroll_wheel12()
% Illustrates how to use WindowScrollWheelFcn property
%f = %e 'WindowScrollWheelFcn'
global dd
set(gcf,'WindowScrollWheelFcn',@figScroll);


x = [0:.1:40];
y = 4.*cos(x)./(x+2);
a = axes;
h = plot(x,y);

title('Rotate the scroll wheel')
var12=0;
tv12=1;
function figScroll(src,evnt)

if evnt.VerticalScrollCount > 0
var12=var12+1;
tt(tv12)=tv12;
xv12(tv12)=var12;

elseif evnt.VerticalScrollCount < 0
var12=var12-1;
tt(tv12)=tv12;
xv12(tv12)=var12;

end

disp('time')
disp(tv12)
disp('value')
disp(var12)
%outdd=[tv12 var12];
dd=[tt; xv12];
plot(tt,xv12,'*')
tv12=tv12+1;

end %figScroll
% disp(eventdata.scrdata)

disp(var12)
% outdd=[tv12 var12];
outdd=dd;

end % scroll_wheel





roberson(a)ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
message <fvfrk5$1tt$1(a)canopus.cc.umanitoba.ca>...
> In article <fvfnpd$rcl$1(a)fred.mathworks.com>,
> muzaffar <muzaffarbashir(a)yahoo.com> wrote:
>
> >could you please give me some more details how i can
use it
>
> >"Use the WindowScrollWheelFcn callback, get the count
from
> >the ...."
> >if i move scroll wheel up and down (at the same time )
is
> >it possible to get its values in some variable.
>
> You can't move the scroll wheel up and down *at the same
time*,
> unless you are referring to different axes (e.g., that
you
> mean "rotate counter-clockwise" when you say "up", and
> you mean "press vertically to click the middle button"
when you say "down".)
>
> As far as Matlab is concerned, at any instant, the
scroll wheel
> either stays the same, rotates forward one "click", or
rotates
> backwards one "click". Matlab increments a counter for
each "forward"
> (clockwise, "down") click, and decrements a counter for
each "backwards"
> (counter-clockwise, "up") click, so when the counter is
fetched it
> represents the net rotation since the counter was last
cleared.
>
> For more information, see the Matlab documentation on
Figure Properties,
>
>
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/f
igure_props.html
>
> and search about 80% of the way through the page to the
description
> of WindowScrollWheelFcn
>
> For more information on creating callbacks,
>
>
http://www.mathworks.com/access/helpdesk/help/techdoc/creat
ing_guis/f16-999606.html
> --
> "No one has the right to destroy another person's
belief by
> demanding empirical evidence." -- Ann
Landers

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