Re: PyDia and Metapost

["Rob McDonald" <robm asdl gatech edu>]

> In render_metapost.c , in the function draw_string , there is a switch
based
> on Dia's alignment parameter.  The comment says
>
> /* We use the "top" modifier to MetaPost's alignment because Dia draws
>  * text _above_ the point at which the text is "located".  */
>
> (sorry I don't have a line number, I'm browsing source in the online CVS.)
>
> Consequently, the code uses the MetaPost commands
>
> label.urt
> label.top
> label.ulft
>
> For right, center, and left aligned text.  This would appear to be the
right
> thing to do.
>
> However, when you position text in a box, it comes out wrong.  Manually
> editing the *.mp file and replacing the above strings with
>
> label.rt
> label
> label.lft
>
> Gives the behavior I'd like to see (very close to where it appears on the
> Dia screen.)
>
> The MetaPost home page w/ documentation:
> http://cm.bell-labs.com/who/hobby/MetaPost.html
>
> Should be a trivial fix, but the comment makes me think it should be
right.
> Has Dia's semantics for text positioning changed since this comment was
> written?  Does Dia's handling of text positioning change depending on what
> kind of object you're working with?  I am using labeled rectangles from
the
> flowchart sheet.
>
> When I don't change the MetaPost commands noted above, the text is placed
in
> the wrong place in the rectangle.  This is especially evident when you
have
> a multi-line label, in that case, the text frequently falls outside the
box.

Filed # 331491

             Rob