Error using getframe.

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HARIHARAN HEMARAJAN
HARIHARAN HEMARAJAN 2015-10-30
评论： Geoff Hayes 2015-10-31
Hi, I am trying to program an AVI on a crank-slider mechanism, but it keeps on showing up this error:
"Error using getframe (line 53)"
"A valid figure or axes handle must be specified"
"Error in Animation (line 33)"
"F=getframe(1);"
I am really new to matlab, so I can't seem to resolve this error.
w = 1.25;
Ampl = 10;
t = [0:1/30:10];
Px = Ampl*cos(w*t);
Py = Ampl*sin(w*t);
AVI = 1;
M_Movie = 0;
if AVI==1
Rotation_Movie = VideoWriter('Rotation_Movie.avi');
open(Rotation_Movie);
end;
for k = 1:length(t);
plot(Px,Py);
hold on;
plot(Px(k),Py(k),'r.','MarkerSize',25);
if k > 5;
plot(Px(k-1),Py(k-1),'r.','MarkerSize',20);
plot(Px(k-2),Py(k-2),'r.','MarkerSize',15);
plot(Px(k-3),Py(k-3),'r.','MarkerSize',10);
plot(Px(k-4),Py(k-4),'r.','MarkerSize',5);
plot(Px(k-5),Py(k-5),'r.','MarkerSize',1);
end;
hold off;
F=getframe(1);
if(AVI);
writeVideo(Rotation_Movie,F);
elseif (M_Movie)
E_movie(k)=F;
end;
end;
if(AVI);
close(Rotation_Movie);
end;

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回答（1 个）

Geoff Hayes
Geoff Hayes 2015-10-30
Hariharan - rather than using 1 as an input to getframe, why not try using gcf to get the handle to the current figure (which may not be '1' for whatever reason)? Replace your above with
F=getframe(gcf);
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HARIHARAN HEMARAJAN
HARIHARAN HEMARAJAN 2015-10-31
Yes, you are right. The error resolved, but I made it wheel spin round and round. How to I get it to go back and forth like a crank-slider would do? Thank you.
Geoff Hayes
Geoff Hayes 2015-10-31
Hariharan - back and forth from which point? Do you mean to say that if the Marker reaches a certain angle (relative to the origin) of the circle then it should change direction and so bound back and forth between two points?

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