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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=12091#action_12091 ] 

Dennis Hamilton commented on OFFICE-1584:

David, Thank you.  That is great information.

Bug 2 - agreed.  It took me a little head-scratching, but I do believe the various stars are the only regular concave polygons. 

Bug 3 - The number of edges and number of vertices being equal is an observation that applies in accordance with the wikipedia definition.  Because the ODF concave regular polygon is not defined in terms of lines between vertices, there needs to be some other nomenclature.  (If sharpness is 0, it seems to me as if the result is a convex polygon with twice the number of corners than the concave polygon with sharpness 100.)   

Bug 4 - OK, on having the number of corners being the number of vertices that are not "sharpened" (that is, they are the always less-than 180 angles in the direction facing the center of the figure for more than two corners).   This is not obvious from the explanation in the ODF 1.2 specification, which is not based on the geometric definition of concave polygons based on how lines are drawn between vertices but on sharpness instead.  These are not equivalent except for certain difficult-to-represent values of sharpness for a given number of corners.  Note that the draw:sharpness definition suggests that the sharpened corners are indeed corners.
I am all right with any definition of draw:corners that makes it clear what the figure is from the ODF specification alone.  It would be great to have the sample star from your figure as one with the number of corners and sharpness of 50%.   So, when sharpness is 0, do you still count only half of the corners in your implementation?

Bug 6 - Somewhere in the treatment of glue points it says that every drawing has default glue points.  It may even say how many default glue points.  (I suppose this gets interesting for custom shapes too.)

Bug 7 - I am not sure that the coordinate system of the slide is necessarily the coordinate system of the drawing shape, at least in SVG terms.  We need to nail that down.  These shapes can be used in text and table cells and other exciting places.  I think more has to be said about what the case is.

> 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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