[etoys-dev] (SQ-749) When you add a vertex to a polygon, the added vertex is at the same location as the another vertex and not visible until moved

Steve Thomas sthomas1 at gosargon.com
Thu Aug 12 04:32:00 EDT 2010

On Thu, Aug 12, 2010 at 3:32 AM, Bert Freudenberg <bert at freudenbergs.de>wrote:

> This would likely be simple to implement, but could break existing
> projects. E.g. the morphing stuff in the showcase. Maybe you could take a
> look?

Checked "Morphing" by Kazuhiro Abe and that should be fine. Each Polygon in
the holder has the same number of vertices and the script simple changes the
positions of the vertices one at a time.

"The Walkers" and associated remixes by P.A. Dreyfus uses a special category
"morphing" which would be great to get into Etoys (although I would suggest
the addition of some way to show/manage the frames) to make the invisible
more visible and to make it easier to create these kind of animations.
Anyway, whether this would be a problem or not depends on how it is
implemented.  If he stores complete information about the polygon in each
frame, I see no problems. If he only stores differences and
adds/removes/repositions each vertex that MAY cause a problem.

Anyway if it is a simple change and you can make it, I think I can easily
test the change by opening the project, then file-in the changes and see if
anything breaks. Or you could also ask P.A. Dreyfus (master of polygon's and
connectors) what he thinks as he knows and can check the changes against his

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