Re: [PATCH] Database shapes and start arrow

[Hans Breuer <hans breuer org>]

At 23.04.2012 07:10, Jim Ursetto wrote:
> Hi,
> I noticed the database shapes set can change the end arrow type on references but
> not the start arrow.  I was just curious if this was omitted for a reason.
I did not implement it the way it is and I'm not an expert in database 
diagrams. But a reason might be that the direction of the connection 
actually has a meaning. If so: arrows on both sides of the line would 
reduce the meaning.

> I thought it might be useful, so I implemented start arrows at:
>
> https://raw.github.com/gist/2468876/5046e5d3ef4174379eab24e836749504ccdef294/dia-0.97.2-dbarrow.patch
>
> It is against HEAD but applies fine to 0.97.2.
>
> There seems to be no downside except old files will print some warnings until you re-save:
>
> 1) loading old file into new dia: will warn to stderr that start_arrow is
>      missing for all references,
This is not the way backward compatibility is handled in Dia. The right 
behaviour would be to initialize to the previous default without any 
warning whatsoever.
> and default correctly to no start arrow
> 2) loading new file into old dia: will ignore the start arrows
Regards,
        Hans

-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to
get along without it.                -- Dilbert