From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <32d987d50712181056r24d5ad5dxd4173359d0263655@mail.gmail.com> Date: Tue, 18 Dec 2007 15:56:17 -0300 From: "Federico G. Benavento" To: nu3e@arrl.net, "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu> Subject: Re: [9fans] graphical clock demo at IWP9 In-Reply-To: <4767E481.70503@degood.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <4767E213.9070208@degood.org> <8ccc8ba40712180711x30dda594v1a62248c820cba19@mail.gmail.com> <4767E481.70503@degood.org> Cc: Topicbox-Message-UUID: 1c6f016a-ead3-11e9-9d60-3106f5b1d025 that's really neat, props! http://www.tip9ug.jp/who/fgb/mclock.png On Dec 18, 2007 12:17 PM, John DeGood 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 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 > >> 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 > >> 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