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Subject: [OASIS Issue Tracker] Commented: (OFFICE-1584) Editor Note: Section17.127 draw:concave

    [ http://tools.oasis-open.org/issues/browse/OFFICE-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12056#action_12056 ] 

David Faure commented on OFFICE-1584:

I made the initial request that has lead to this addition to the spec (cf email "Proposal: regular polygons" on 2004-07-14).

Answering the issues raised here:
"A polygon with one interior angle greater than 180 degrees is also a concave polygon" -- yes, but not a concave *regular* polygon.
As the WP article says, regular polygons are either convex or star-shaped, so concave implies star-shaped for a regular polygon.

Yes, the text for this attribute should definitely put it in context: this is an attribute for <draw:regular-polygon> only!

BUG 1: I agree, it should say circle. My initial proposal said circle ;-)

BUG 2: I don't see a bug there, see above; concave regular polygons _are_ star-shaped. Well the text shouldn't say "an example" then, but "Concave regular polygons have the shape of a star" or something like that.

BUG 3: I don't understand; the number of edges is equal to the number of corners anyway, so this seems fine to me.

BUG 4: yes that would makes sense  (not a bug, just stating the obvious to improve document validation, but ok)

BUG 5: the text might not be clear, feel free to clarify it, but I don't see the problem, this works _just_ like all other polygons defined elsewhere in the spec. svg:x, svg:y, svg:width and svg:height define a rectangle, and the polygon fits inside that rectangle.
Not sure what you mean by anchor alignment.

BUG 6: no idea (not sure koffice even supports that). But if other polygons define glue points then it would make sense to say that every "corner" (vertex?) is a glue point.

BUG 7: no idea, although I don't see the big issue. The coordinate system of a presentation slide is 0,0 in the topleft corner of the slide... in any case this isn't specific to regular polygons.

For historical reference, all this comes from http://www.davidfaure.fr/kde/regular-polygon.png :-)

> Editor Note: Section 17.127 draw:concave

> -----------------------------------------
>                 Key: OFFICE-1584
>                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-1584
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Bug
>    Affects Versions: ODF 1.2
>            Reporter: Robert Weir 
>            Assignee: Patrick Durusau
>             Fix For: ODF 1.2
> Transcribed from ODF_Revised_Editorial_Notes_27May2009.odt
> Original author: Patrick Durusau
> Section 17.127 draw:concave
> Ed. Note While the explanation is correct for one class of concave polygons it is not correct for all. A polygon with one interior angle greater than 180 degrees is also a concave polygon. The draw:shapness attribute only enables the drawing of only one type of concave polygon. That's ok, but we need to say it is a limited class of polygons to which this applies. 

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