I read about PasteUpMorph>>patchAt:without:andNothingAbove:  in the
Squeakland mailing list archive.  How would I go about using it?

Thanks,
Jeff

----- Original Message -----
From: "Bert Freudenberg" <bert at isg.cs.uni-magdeburg.de>
To: "The general-purpose Squeak developers list"
<squeak-dev at lists.squeakfoundation.org>
Sent: Friday, July 04, 2003 1:32 PM
Subject: Re: Newbie Questions


>
> Am Freitag, 04.07.03 um 16:42 Uhr schrieb Ned Konz:
>
> > On Friday 04 July 2003 07:36 am, Lic. Edgar J. De Cleene wrote:
> >
> >> You could test color in world withour using e- toys like in a
> >> following.
> >>
> >> [(World colorAt: (self center)
> >>         belowMorph: self) = Color yellow]
> >>
> >>
> >> Replace self center for choosen point of control.
> >
> > But that doesn't work on the turtle trails, as far as I can tell. The
> > implementation of PasteUpMorph>>patchAt:without:andNothingAbove: just
> > does a background fill and draws the submorphs. It skips the
> > turtleTrailsForm completely (unlike drawOn:).
>
> By looking at the implementation I thought that, too. But actually it
> works, at least in a playfield. This is because a patch of the World is
> examined, which includes the playfield and its turtle trails.
>
> To make that work on the World itself it is sufficient to draw the
> world itself onto the ColorPatchCanvas. I can see no good reason why
> one would not want to do so. See the updated changeset in my next mail.
>
> -- Bert
>