Re: Proposal: Fix discrete to animation in SVG 1.1 Second Edition

On Mon, 28 Mar 2011 00:18:04 +0200, Cameron McCormack <[email protected]>  =

wrote:

> Hi Brian.
>
> I have SVG-ACTION-3013 to look into this.  I believe the changes are
> good, and I like your proposed wording but have comment on it:
>
> Brian Birtles:
>> Proposed change:
>> ----------------
...
>>   As with a discrete from-to animatiom, a discrete to animation will =
 =

>> set the
>>   underlying value for the first half of the simple duration (or, if =
a
>>   keyTimes list is provided, until the offset into the simple duratio=
n
>>   specified by the second value in the keyTimes list) and the "to"  =

>> value for
>>   the remainder of the simple duration.

Either leave the 'keyTimes' part out, or you have to clarify the  =

'keyTimes' attribute too (it's currently implying that there has to be a=
  =

'values' attribute for it to have an effect).

>> Interoperability:
>> -----------------
>>
>> Opera 11.01, Batik 1.7, and WebKit nightly build r80213 (3 Mar 2011)
>> all provide identical animation for both of the provided examples.
>> i.e. they do not conform to the specified behaviour but follow this
>> proposal.
>>
>> (I note however that Opera and WebKit appear to ignore keyTimes in th=
is  =

>> case.)

I think this is because both the SMIL and SVG specs say that 'keyTimes' =
 =

corresponds to the 'values' attribute, and that it should have no effect=
  =

on to/by/from-by/from-to animations, e.g:

[[ Each time in the list corresponds to a value in the =E2=80=98values=E2=
=80=99 attribute  =

list, and defines when the value is used in the animation function. ]]

and

[[ If a list of =E2=80=98keyTimes=E2=80=99 is specified, there must be e=
xactly as many  =

values in the =E2=80=98keyTimes=E2=80=99 list as in the =E2=80=98values=E2=
=80=99 list. ]]


Cheers
/Erik

-- =

Erik Dahlstrom, Core Technology Developer, Opera Software
Co-Chair, W3C SVG Working Group
Personal blog: http://my.opera.com/macdev_ed