[MACTCL] Cap styles, stipples, arcs, etc

[James B. <jk...@mr...>]

Looking at the tk demos, specifically at "The canvas item types" plot, I see
there are numerous things not implemented correctly on the Mac (tested on
MacOS X). I remember hearing that stipples have never been implemented on the
Mac, so it's not so much as a bug of the MacOS X version as simply a mac
specific issue.

Are there any plans on solving these problems? I can see the following:

* Capstyle round appears to be ignore - it always come out square looking.

* Stipples are ignore.

* The arrow positions are often incorrect (see zig-zag arrow in top-left
"Lines" plot of the mentioned demo).

* Missing pixels when drawing circle chords.

* Misaligned graphics giving rise to gaps between an object and its border.

* No smoothed lines.


Are these missing because the Mac graphics does not support an equivalent? If
so then it seems likely that they aren't trivial to fix. I'm currently making
use of stipples in some cases, but I'd like to know whether it's worth time
working on an alternative for our application.

James

PS. If anyone is interested in an example of a Unix app which, thanks greatly
to Tcl/Tk, has been successfully ported to both Windows and now MacOS X, then
feel free to look at my .sig and try the Staden Package. (It's very specialist 
software so it's not going to be useful to most people, but it does
demonstrate the power of Tcl/Tk quite well and so, I hope, promotes it.)

-- 
James Bonfield (jk...@mr...)   Fax: (+44) 01223 213556
Medical Research Council - Laboratory of Molecular Biology,
Hills Road, Cambridge, CB2 2QH, England.
Also see Staden Package WWW site at http://www.mrc-lmb.cam.ac.uk/pubseq/