animating graphics

[Anon]

Is it possible to animate graphics using the gd lib??
eg.

$image=imagecreate(400,400);
$blue=imagecolorallocate($image,0,0,255);
$white=imagecolorallocate($image,255,255,255);
imagefilltoborder($image,0,0,$blue,$blue);

for($i=1,$i=20,$1++){
imagearc($image,$i,$i,30,30,0,360,$white);
imagepng($image)
}

will output the final result, but not the steps in between? Shouldn't this draw my image 19x having the circle in a different spot each time giving the impression of animation??

Any ideas on how to go about animating?

Thanks
cash
<a href="mailto:[e-mail]>e-mail me</a> thanks

[fitzbean]

I dont think you can animate using gd lib & php.

[Anon]

Especially since PNGs don't do animation. The MNG format is something else again.

And gd_lib don't do GIFs either these days (and never did animated GIFs).