Sorry, not in server.
On Dec 18, 2007 4:06 PM, John DeGood <[EMAIL PROTECTED]> 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 > >
