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(unknown charset) Re: opacity, animate and mask

From: (unknown charset) ~:'' ありがとうございました。 <j.chetwynd@btinternet.com>
Date: Fri, 3 Aug 2007 14:41:59 +0100
Message-Id: <C5B6E971-E317-49D1-A440-0A349C56E228@btinternet.com>
Cc: (unknown charset) SVG List <www-svg@w3.org>
To: (unknown charset) Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>


there are many possible similes but why chose the opacity of a glass  
why not it's thickness for instance?

No one has so far contributed a use case, where this behaviour is  
essential or even desirable, whereas the uses of the contrary  
position seem natural, as for instance fading linked images...


Jonathan Chetwynd

apologies, I made an error with respect to Opera, it may have been  
Amaya which allows one to select and click through some holes.

On 3 Aug 2007, at 10:13, Dr. Olaf Hoffmann wrote:


if pointer-events is not explicitly noted, the initial
value 'visiblePainted' is used.

I looked in my test case(s) related to this and could
not find any problem with Opera 9.

The relation of opacity and events is maybe comparable
to an opaque glass plate - no matter how opaque it is,
you cannot grab through it, even if you cannot see it.

This is different if you set for example display to none
or visibility not to visible or pointer-events to none, then
it is possible to 'grab' through to an object below it.
I think in SMIL 3 they want to offer a value for opacity
related attributes or properties, to allow authors to
define, how opaque something has to be to recieve
an event, but this is not the case for SVG (or SMIL 2).

User agents I know to support animation of opacity:
Opera 8 and 9, adobe plugin.
KSVG1 and Amaya with some specific simple animation types
can animate it too, but they do not care about events.
Received on Friday, 3 August 2007 13:42:16 UTC

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