Re: [9fans] graphical clock demo at IWP9

["Federico G. Benavento" <benavento@gmail.com>]

that's really neat, props!

http://www.tip9ug.jp/who/fgb/mclock.png

On Dec 18, 2007 12:17 PM, John DeGood <john@degood.org> wrote:
> I hate it when that happens. :-)  Sorry, I dropped the tarball in the
> wrong place, please try again.
>
>
> Francisco J Ballesteros wrote:
> > Sorry,
> >
> > not in server.
> >
> > On Dec 18, 2007 4:06 PM, John DeGood <john@degood.org> wrote:
> >
> >> Ron Minnich encouraged me to bring my incomplete little graphical clock
> >> program to IWP9, and then he encouraged me to complete it.  So please
> >> blame Ron for this:
> >>
> >>   http://degood.org/plan9/mclock.tar
> >>
> >> History of this clock program:  in the 1970s Dave Robinson, an EE
> >> professor at UDel, wrote a cute graphical clock program in PDP-11 BASIC
> >> that displayed on a Tektronix vector graphics terminal
> >> <http://www.selectric.org/tek4010/index.html> in his lab.  The clock
> >> image was drawn as vectors, with the filled areas composed of hundreds
> >> of side-by-side vectors.
> >>
> >> In 1982 I got a printout of the program from Dave, typed in all the
> >> vector coordinates, and then rewrote the program in FORTRAN for an HP
> >> 3000 timeshared minicomputer, outputting escape sequences to an HP 2648
> >> raster graphics terminal
> >> <http://www.atariarchives.org/cgp/Ch02_Sec16_14.php> in my lab.
> >>
> >> Flash forward ~25 years:  I stumbled across a line printer listing (on
> >> green bar paper, of course) of my 1982 program in my basement, and on a
> >> whim decided to rewrite it in C for Plan 9 using draw(2).  It looked
> >> very retro.  I tried adding color, but it still wasn't satisfying
> >> because the hundreds of vectors used for area fill weren't compatible
> >> with variable size windows.  So I tediously determined bounding polygons
> >> for each of the filled areas and called fillpoly() instead.
> >>
> >> Magic feature:  when the clock diameter is > 600 pixels (e.g.
> >> fullscreen) the linewidth increases from thick=0 (1 pixel) to thick=1 (3
> >> pixels) to make the clock more readable from a distance.
> >>
> >> Have fun.
> >>
> >> John
> >>
> >>
> >>
> >
> >
>
>



-- 
Federico G. Benavento