[Squeakland] Pen Trails and Sensors

[Alan Kay]

Thanks you very much Bert!

Cheers,

Alan

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At 7:36 PM +0200 7/4/03, Bert Freudenberg wrote:
>It works in playfields, not on the World itself. And it can be 
>tricky  to choose the right color because the trails are in 8 bit 
>while the  rest is in 16 or 32. Things evolve ;-)
>
>I'll sent a fix for both issues to the Squeak-Dev list.
>
>-- Bert
>
>Am Freitag, 04.07.03 um 20:15 Uhr schrieb Alan Kay:
>
>>Thanks Ned --
>>
>>At 8:27 AM -0700 7/4/03, Ned Konz wrote:
>>>On Thursday 03 July 2003 07:20 pm, Jeff Longland wrote:
>>>>  I've been using
>>>>  penDown to create a pen trail behind the snake, but my major
>>>>  problem is that the sensor on my object is unable to view the pen
>>>>  trail.
>>>
>>>Welcome Jeff!
>>>
>>>Some context for the rest of the list: unless the Squeakland image has
>>>a fix that isn't in the Squeak 3.5 image, the turtle trails aren't
>>>visible in the color:sees: test.
>>
>>That's odd and interesting -- they used to be, and should be -- for 
>>just some of the reasons that Jeff needed them. There are many 
>>wonderful things that can be done if the color sensing can see the 
>>turtle trails. Any idea of how this got lost? Can Scott Wallace 
>>easily  put this back in?
>>
>>Cheers,
>>
>>Alan
>>
>>>
>>>One possibility is to make the turtle trails visible to the
>>>color:sees: test (and add a per-Project Preference for making them
>>>visible). Is there any interest in this?
>>>
>>>Looking back in the Squeakland list, I see that Markus Denker recently
>>>posted a link to a project that includes an enhancement that Markus
>>>Gaelli wrote. This enhancement lets you make PolygonMorphs (like
>>>lines and filled polygons) from your scripts. So instead of using the
>>>penDown turtle features, you'd add points to a line that you were
>>>constructing. That would be visible to the color:sees: test.
>>>
>>>I quote Markus D here:
>>>
>>>----
>>>>  I was talking to Markus Gaelli abaout his PolygonFactory
>>>>  improvement, and then I realised that sending a Link
>>>>  to the squeak.org bugfix-archive is not the right thing to
>>>>  do on the squeakland mailinglist... that's something for
>>>>  the squeak.org hackers.
>>>>
>>>>  So here's now a version that is actually usable:
>>>>
>>>http://squeakland.org/project.jsp?http://www.ira.uka.de/~marcus/ 
>>>PolygonFactory.001.pr
>>>>
>>>>  This is a project with Markus's new Polygon-drawing tiles and a
>>>>  very simple example.
>>>>
>>>>          Marcus
>>>>
>>>>  On Fri, May 09, 2003 at 09:51:03AM +0200, Marcus Denker wrote:
>>>>  > On Thu, May 08, 2003 at 02:07:41PM -0800, Alan Kay wrote:
>>>>  > > However, it's also pretty clear that a more appropriate
>>>>  > > implementation would be to have them actually make an object of
>>>>  > > some kind (a SketchMorph or a PolygonMorph) that works like any
>>>>  > > other object. We will probably do something like this in a
>>>>  > > future version of etoys.
>>>>  >
>>>>  > Hi,
>>>>  >
>>>>  > Markus Gaelli posted something like that to the squeak-dev list
>>>>  > some days ago:
>>>>  >
>>>>  > http://swiki.gsug.org:8080/sqfixes/3240.html
>>>>  >
>>>>  > from preamble:
>>>>  >
>>>>  >  "Change Set:            PolygonFactory
>>>>  >  Date:                   20 April 2003
>>>>  >  Author:                 Markus Gaelli
>>>>  >
>>>>  >  Did you ever want to paint polygons out of the traces of your
>>>>  > EToy-cars?
>>>>  >
>>>>  >  Now it's possible.
>>>>  >  Just drop a polygon in the world, open a viewer on it, select
>>>>  > the category 'Miscellaneous'.
>>>>  >  Here you can select between two new options: -
>>>>  > setVertexFromPositionOf: dot
>>>>  >  With this one you can initialize your polygon to have only one
>>>>  > point, that is the current position of the player (replace 'dot'
>>>>  > with the tile of your player / car)
>>>>  >  - addVertexFromPositionOf: dot
>>>>  >  Use this one if you want to add a new point to your polygon,
>>>>  > which is the current position of the player (again replace 'dot'
>>>>  > with the tile of your player, probably somewhere after you just
>>>>  > moved it a bit...)
>>>
>>>--
>>>Ned Konz
>>>http://bike-nomad.com
>>>GPG key ID: BEEA7EFE
>>>
>>>_______________________________________________
>>>Squeakland mailing list
>>>Squeakland at squeakland.org
>>>http://squeakland.org/mailman/listinfo/squeakland
>>
>>
>>--
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