[x3d-public] text minor alignment

[Andreas Plesch]

Hello,

as I looked into the 'length' and 'maxExtent' fields of the text node, I
noticed similar issues with snapshots for the NIST conformance example
scenes. For those fields it turns out that they are not widely supported in
players, sofar only BS Contact seems to have support while freeWrl,
view3dscene and InstantPlayer do not.

I think both 'length' and 'maxExtent' could be implemented for x3dom due to
the way it renders text. 'length' is very similar to the maxWidth parameter
of ctx.fillText() for canvas, and maxExtent is defining a texture mapping.

Andreas


On Wed, Sep 9, 2015 at 5:07 PM, Roy Walmsley <roy.walmsley at ntlworld.com>
wrote:

> Andreas,
>
>
>
> Thanks for the  update. Perhaps all it needs is for the snapshot to be
> regenerated, and also the first slide in the show.
>
>
>
> Roy
>
>
>
> *From:* Andreas Plesch [mailto:andreasplesch at gmail.com]
> *Sent:* 09 September 2015 21:43
> *To:* Roy Walmsley
> *Cc:* X3D Graphics public mailing list
> *Subject:* Re: [x3d-public] text minor alignment
>
>
>
> Hello Roy,
>
> thanks for reviewing this issue. In the mean time I had opportunity to
> view the scene with freeWrl and InstantPlayer. Both render the scene as
> expected, eg. with the first line above the x-axis while its baseline just
> touches it. So I think something was a bit off when the snapshot on the
> archive web site was generated.
>
> Andreas
>
>
>
>
>
> On Wed, Sep 9, 2015 at 8:14 AM, Roy Walmsley <roy.walmsley at ntlworld.com>
> wrote:
>
> Andreas,
>
>
>
> I have reviewed your comments below and find that I am in agreement with
> you.
>
>
>
> You are correct in saying that the default for the /justify/ field is
> [“BEGIN” “FIRST”]. This is quite clearly stated in 15.2.2.3 of the 19775-1
> specification.
>
>
>
> Then, when /horizontal/ is TRUE and /topToBottom/ is TRUE, which both are
> by default, Table 15.4 in the 19775-1 specification states that when the
> minor alignment is “FIRST” the baseline of the first line shall be aligned
> with the origin.
>
>
>
> The inevitable conclusion is that the figure displaying the NIST
> Conformance for the default field settings is incorrect. I will raise this
> issue for discussion at the next available opportunity. Please keep us
> informed of any further findings.
>
>
>
> Great catch. Thank you.
>
>
>
> Regards,
>
>
>
> Roy
>
>
>
>
> --
>
> Andreas Plesch
> 39 Barbara Rd.
> Waltham, MA 02453
>
>
>
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