Rails spinoffs - Oct 2006 - Effect.puff() ... how to control where it puffs away?

Hi to all,

I''m very new to either Ruby and scriptaculous. I''ve just tried
using
Effect.puff(), and it puffs towards the North-West (or 10 O''Clock). Is
it possible to control the direction where the element should puff to?

Thank you in advance.


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darkmatter a écrit :
> Hi to all,
> 
> I''m very new to either Ruby and scriptaculous. I''ve just
tried using
> Effect.puff(), and it puffs towards the North-West (or 10
O''Clock). Is
> it possible to control the direction where the element should puff to?
Actually, Puff doesn''t puff towards the NW: it scales "from
center"
outwards.  You might get the impression it puffs NW-wise if you puff an
element that is not absolutely positioned prior to effect:
"absolutizing" it on the fly may result in a vague sense of movement.

At any rate, you can control the scaling the same way you control it in
Effect.Scale (as Puff is a synchronized execution of Scale and Opacity):
 through the options scaleX, scaleY and scaleFromCenter.

If you look for a specific direction, you might want to clone the
Effect.Puff code and make it use Effect.Grow internally, instead of
Effect.Scale.  Effect.Grow provides a ''direction'' option that
supports
four diagonal directions + ''center''.

But before you embark on all this, ask yourself: do you *really* need to
control puff direction?  Its default mode (scale from center) is pretty
good for just about all needs.  We''re talking about an element that
won''t even be /visible/ in the end, and usually puffs out over a short
period of time (default duration is 1.0 sec., for instance).

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Hi Christophe,

Thanks for your reply. I''ll surely take your advise on cloning/merging
Effect.Puff with Effect.Grow and Effect.Scale :D

As for your question, I may need the Puff-ed element re-appear again
from the last place it was dissappearing. But, that''ll be in the long
run.

Thanks again.

Cheers,
Darkmatter

Christophe Porteneuve wrote:
> ......
> At any rate, you can control the scaling the same way you control it in
> Effect.Scale (as Puff is a synchronized execution of Scale and Opacity):
>  through the options scaleX, scaleY and scaleFromCenter.
>
> If you look for a specific direction, you might want to clone the
> Effect.Puff code and make it use Effect.Grow internally, instead of
> Effect.Scale.  Effect.Grow provides a ''direction'' option
that supports
> four diagonal directions + ''center''.
>
> But before you embark on all this, ask yourself: do you *really* need to
> control puff direction?  Its default mode (scale from center) is pretty
> good for just about all needs.  We''re talking about an element
that
> won''t even be /visible/ in the end, and usually puffs out over a
short
> period of time (default duration is 1.0 sec., for instance).
> ......

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