Le 04/12/2012 17:28, Jens Simon Strom a écrit :
In version 5.3 I have written a script which produces an animated plot of a
magnetic field showing approx. 70 oscillating and rotating arrows. The arrows
are generated by the command 'arrows' in a loop. I used the 'pixmap' and the
'show_pixmap()' command resulting in a perfect calm and smooth movie.
Version 5.4.0 tells me that 'pixmap' is obsolete and 'drawlater' and 'drawnow'
shall be used instead. I have tried my best with the latter two plus 'xpause'
but never got a satisfying result - the animation performs like a defect silent
film projector. Deleting seem to be an issue.
Could anyone kindly give me a hint how I can calm down the animation with
'drawlater' and 'drawnow' in a loop where arrows are drawn with 'arrows'?
'comet' might be a workarond but that would mean a new start from scratch.
Kind regards
Jens
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does the sample code below solves the problem? Note that it does not use
neither pixmap neither drawlater drawnow
clf();a=gca();a.data_bounds=[-1 -1;1 1]*10;
t=linspace(0,2*%pi,70);
n=110;
r1=linspace(0,1,n);
r2=linspace(1,10,n);
phi=linspace(0,%pi/2,n);
k=1;
nx=[r1(k)*cos(t+phi(k));r2(k)*cos(t+phi(k))];
ny=[r1(k)*sin(t+phi(k));r2(k)*sin(t+phi(k))];
xarrows(nx,ny)// create the Segs entity
e=gce(); //get the handle on it
realtimeinit(0.05);
for k=2:n
realtime(k-1) //wait a little to slow down the loop if necessary
nx=[r1(k)*cos(t+phi(k));r2(k)*cos(t+phi(k))];
ny=[r1(k)*sin(t+phi(k));r2(k)*sin(t+phi(k))];
e.data=[nx(:) ny(:)];//update arrow coordinates
end
Serge Steer
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