On Tuesday 01 February 2005 9:07 pm, Blake wrote:
> > Beyond this you may have to remove invisible morphs from the World  
> > (perhaps adding them as children of a separate, hidden morph) and put  
> > them back later when they become available. Or you could move them just  
> > offscreen and save their actual position in a property. When you pan the
> >   world you just adjust the offsets and saved positions.
>
> Isn't it simpler to give them their actual positions and just pan the  
> window? I guess if the whole graphic image is stored in memory, it's a  
> different kind of inefficient.

You can do that too (by adding a translation when you render the World). But 
you still have to deal with the 32K limits on the arguments to the primitives 
somewhere. Perhaps this won't be a problem.

Anyhow, it's easy to try. Just subclass PasteUpMorph or change its 
drawSubmorphsOn: method to do a translation.

You can then do something like

World become: (World as: MyNewPasteUpMorph)

to try the new behavior (assuming that you subclassed).

You can now have Project subclasses; these can provide different kinds of 
Worlds.

-- 
Ned Konz
http://bike-nomad.com/squeak/