[squeakland] Possible Bug?

Jeremy Landry hakyoku at gmail.com
Sat Feb 3 00:56:44 UTC 2018


I'll give that a shot, thanks.  I thought I had tried everything, but I
guess staring at it for too long made me impervious to seeing my own
mistakes.  I'm still learning ways to self-correct...

On Fri, Feb 2, 2018 at 5:58 AM, Bert Freudenberg <bert at freudenbergs.de>
wrote:

> Hi Jeremy,
>
> it looks to me as if it works fine if you remove the second line in this
> script:
>
> [image: Inline images 3]
>
> You might also try to replace it with setting bottom instead of y.
>
> The source of this is likely that in Etoys y goes up but in Squeak it goes
> down, so in various places of the system it has to be inverted. That causes
> truncation to sometimes round up or down. Which apparently accumulates some
> error. Not trivial to fix.
>
> - Bert -
>
> On 26 January 2018 at 22:49, Jeremy Landry <hakyoku at gmail.com> wrote:
>
>> I haven't investigated it into the Etoys source, but I found this bizarre
>> bug, likely appearing due to a number being turned into an integer when
>> it's odd, but I cannot figure out why it would be called at all...
>>
>> Included is a project that demonstrates this bug.  I looked at the
>> individual pieces and they aren't 'personally' responsible, but when
>> working as a unit, they then exhibit the bug.
>>
>>>>  custom window demos.013.pr
>> <https://drive.google.com/file/d/1nefep7r-gSbJ5xyLGKbWUU54ozFlzNid/view?usp=drive_web>
>>>>
>> Basically what seems to cause it is resizing nested playfields via
>> script.  R​​esizing with morphic handles works fine, but when sending an
>> Etoys 'LENGTH' change, somewhere along the line, things go wrong.  Again,
>> my guess is that some number is getting changed into an integer from a
>> floating point, and thus getting rounded up, which would shift it up when
>> it's not a floating point number any longer.  However, this doesn't explain
>> why it doesn't have the same symptom when changing WIDTH.
>>
>> Thanks for any insight into dealing with this.  I'm not exactly sure
>> where to begin looking within the Etoys Source to make things work as
>> expected since there's likely 30 reasons (read: random object methods) why
>> this might occur and only for vertical change/LENGTH change.
>>
>>
>>
>>
>>
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>>
>>
>
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