[Newbies] Morph speeds up stepping when grabbed

Matthew Fulmer tapplek at gmail.com
Fri Dec 7 20:39:37 UTC 2007

On Fri, Dec 07, 2007 at 01:30:33PM -0700, Matthew Fulmer wrote:
> On Fri, Dec 07, 2007 at 04:22:17AM -0800, kropki wrote:
> > 
> > Hi!
> > 
> > I'm having some performance problems with morphs, I think.
> > 
> > I have made two morphs: first is the owner of the second and the second one
> > is doing stepping with as little timeStep, as possible (1?). Still it's too
> > slow.
> > 
> > When I click on the morph, the owner is being picked. While in the air, the
> > step function for the submorph suddenly gets called very often and the
> > animation is nice and fast.

By the way, it isn't the step method that gets called a lot
while dragging, it is the drawOn: method. So, it seems the
stepping method is doing it's thing, but you only get to see it
if you redraw more often

> > What's the reason for that? How can I modify the morphs, so that I get
> > faster animation, when morphs aren't grabbed? Is it because, while in the
> > air, one morph or another gets different stepTime or the step method is
> > called in a different way? Or maybe some part of the code is not being run
> > resulting in less overhead?
> What are you doing in the step method? It sounds like whatever
> the step method does is not initiating a redraw. You need to
> call self changed in order to initiate a redraw.
> also, what is stepTime set to?

I missed that it was set to 1 before. I don't think the
scheduler can really honor step times less than 30 or so. I
believe it tries, but there is usually too much other stuff to

Matthew Fulmer -- http://mtfulmer.wordpress.com/
Help improve Squeak Documentation: http://wiki.squeak.org/squeak/808

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