[Etoys] The behavior of set heading is changed subtly
karl.ramberg at comhem.se
Sat Dec 15 10:12:12 EST 2007
Yoshiki Ohshima wrote:
> Lately, we are fixing various bugs reported on trac and elsewhere,
> and one of these items is:
> (Try the example project made by Abe-san.)
> The simplest fix was to remove some logic that ignores the attempt
> to set a new heading value if it is "close to" the old value. The
> logic was from old days and we (collectively) cannot really see the
> reasoning behind it.
I think it was helpful when you rotated a morph by the handle it would
'snap' to the old angle.
> We can take the check out (and the change is pushed to the update
> stream already), but there is a small risk.
> The risk is that some existing projects may change their behavior; if
> your program depends on the old behavior, where if you set a value to
> heading but it actually doesn't change it sometimes, it could be a
> Also, the calculation of heading after an object bounced at the edge
> is changed. This is similar but more risky because in the old
> behavior the heading was rounded. If your project uses equality on
> the heading value and bounce, this could be a problem. (Now, we have
> the function tile to "round" the value, so one could create a proper
> script with it.)
> Please let us know if this change causes a trouble. Thank you!
> -- Yoshiki
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