RE: Re[2]: [cgmo-webcgm] Initial values, % sub-issue [was: Re[2]: [cgmo-webcgm] Style properties]

["Cruikshank, David W" <david.w.cruikshank@boeing.com>]

For Line Width and Edge Width, zero width, minimum width, and no stroke are different if you follow the guidelines in Annex D of the Standard

D.4.6.3   LINE WIDTH
If a device cannot produce a line of the exact specified width, the closest implemented width is chosen.  If a zero width is specified in the metafile, it is recommended that interpreters select the minimum available width for affected primitives. 

D.4.6.18   EDGE WIDTH
If a device cannot produce a line of the exact specified width, the closest implemented width is chosen.  If a zero width is specified in the metafile, it is recommended that interpreters select the minimum available width for affected primitives. 

On the Text issue, I remember a proposal the Text Height be removed because of the issue with RT boxes, etc.  I see no reason why Text Colour should be affected.  Is Text Font in our requjirements document?

thx...Dave

-----Original Message-----
From: Benoit Bezaire [mailto:benoit@itedo.com]
Sent: Wednesday, May 18, 2005 11:55 AM
To: cgmo-webcgm@lists.oasis-open.org
Subject: Re[2]: [cgmo-webcgm] Initial values, % sub-issue [was: Re[2]:
[cgmo-webcgm] Style properties]


Wednesday, May 18, 2005, 11:51:29 AM, Lofton wrote:
LH> At 04:58 PM 5/18/2005 +0200,
LH> =?US-ASCII?Q?Dieter__Weidenbruck?= wrote:
>> > stroke-weight: maps to LINE WIDTH & EDGE WIDTH, 100% is ok.
>>Do we allow for 0%? This is actually impossible inside the CGM, but no
>>problem for implementors.
>>Result: no stroke

LH> That creates something of a contradiction:

LH> lw' = sw * lw
LH> ew' = sw * sw

LH> WebCGM 1.0 T.20.4 says that LINE WIDTH 0.0 is allowed, and means "Minimum
LH> available line width."
Is there a visual difference between 0.0, "Minimum available line
width", and no stroke?

LH> I don't think we want to require that implementations keep track
LH> of whether the lw' 0.0 comes from the WebCGM instance or from
LH> application of stroke-weight 0. 
I'm not sure what you mean by 'keep track', but an implementation
already has to keep track of the style state to be able to revert back
to the original look (i.e., to implement clearStyleAttr() )

-- 
 Benoit   mailto:benoit@itedo.com

 
>> > text-font: (gone?)
>>not gone as far as I am concerned.

LH> Dave should queue this as an issue.  (Dave, do you recall minuting the
LH> earlier discussion?  I clearly remember discussing it in a meeting or
LH> telecon, perhaps Munich, and thought we concluded that it should go.)

LH> -Lofton