On 14.06.2010, at 22:59, Chris Muller wrote:

> Hmm, I noticed that the "fuzzy edges" only seem to be there only when
> it's rotation is not a multiple of 90-degrees.

Right.

> Another observation:  That when it is exactly 0-degrees (straight up),
> the translucent color is true, but at all other angles, it is somewhat
> "darkened".  I'm not sure why, but there is some "shadow" logic in
> that same method..
> 
> Also, I don't notice any fuzzy edges on standard morphs (Polygon and
> Rectangle), regardless of angle, just the SketchMorph like you pointed
> out.
> 
> Is your objection about visual-quality of those rotated sketches or
> are you saying those fuzzy edges could affect color-testing logic in
> eToy programs?  It sounds like you are saying the latter..

The latter.

- Bert -


> It would indeed be nice if we can have our cake and eat it too..
> 
> - Chris
> 
> 
> 2010/6/14 Bert Freudenberg <bert at freudenbergs.de>:
>> On 14.06.2010, at 05:28, Chris Muller wrote:
>> 
>>> This is a little fix from Henry Johansen which, for me, improves the
>>> rendering of rotated Morphs with respect to translucency.  Today when
>>> Morphs are rotated they are always drawn with the Form paint rule, but
>>> Henriks change allows Form blend for 32-bit displays.
>>> 
>>> It seems to work, and improves the look of my applications.  You can
>>> see the difference easily by rotating a simple RectangleMorph that is
>>> alpha-colored..
>>> 
>>> However, as there are certainly more-qualified experts who may wish to
>>> comment on the subject first, I thought I would start it at the Inbox.
>>> 
>>> - Chris
>> 
>> Etoys depends on primary colors being preserved under rotation. It uses both rotation and color tests a lot.
>> 
>> When I rotate a sketch that had not had translucency before, it would have none after rotating. With your patch, its edges get fuzzy:
>> 
>> 
>>  vs
>> 
>> 
>> So this solution is not general enough. If there was translucency before, it should be preserved under rotation, yes. But if there was none, it should not be introduced. I think there is a way to have your cake and eat it, too, though I'm not quite sure how atm.
>> 
>> - Bert -
>> 
>> 
>> 
>> 
>> 
>> 
>