turtle trails

Andreas Raab andreas.raab at squeakland.org
Sun Mar 2 00:11:00 PST 2003

Hi Karl,

There seem to be two independent problems here. One is that apparently pen
trails in the world are ignored completely (if you're interested check out
PasteUpMorph>>patchAt:without:andNothingAbove: which fills the area with the
world's color only so that anything but a plain color will be ignored ... ho
hum). That means only pen trails in any "inner" playfields can actually

The second problem seems to be related to color depth - even within some
playfield I couldn't get this to work for any display depth > 8. Most likely
there's some odd problem with mapping the colors to indexes correctly. So
the only workaround I can recommend is to use some playfield _and_ set the
display depth to 8bpp.

  - Andreas

> -----Original Message-----
> From: owner-squeakland at squeakland.org 
> [mailto:owner-squeakland at squeakland.org] On Behalf Of Karl Ramberg
> Sent: Saturday, March 01, 2003 11:10 PM
> To: squeakland at squeakland.org
> Subject: turtle trails
> When a turtle walks over a turtle/pen trail there is no way
> for it to see it. The 'color sees' tile does not work
> with pen trails nor do the observation tile 'color under'.
> Anybody have any suggestiones ?
> Karl

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