Spacewar is a classic two-player game with ships that turn, thrust, and shoot in a two-dimensional wrapping rectangle space.   The originating purpose of   [spherical spacewar]   was to see what a Spacewar game might be like played instead over the surface of a sphere.   To map the spherical surface to the computer screen, I included a selection of various traditional map projections, in addition to orthographic and perspective projections, which look more natural.   The program also includes the option of playing in a two-dimensional rectangular space, wrapping or walled, either of which is arguably more fun than playing on the surface of a sphere.

                Program executable:
           md5sum e7d10ad725c8a1ef8c430838cc02c337
                  virtualbox dosvm vdi, with eee-pc retune version         dir screen

                Program source code:
        , August 20, 2006 version.
        , August 16, 2006 version.

                In classic Spacewar, damage from shots reduces the magnitude of a player's shields or ultimately destroys the player's ship.   For my program, I decided instead to have shot damage increase the size of a player's saucer, leaving the ultimately larger player susceptible to the judgement of having lost the space.   The larger player is quickly at a disadvantage in this program.

                I developed the program on a personal computer with a 1.8 GHz AMD Athlon 64 microprocessor.   I wrote it in C, for DOS with 320x200 8-bit VGA graphics, and compiled it in the Borland Turbo C++ 3.0 IDE.   In 2008, I began the work of porting the program to the cross-platform MinGW with SDL C/C++ compiler environment, but halted work soon after outlining the effort.     porting outline

                Spherical Spacewar has a mess of settings displayed to the user in two "Commands, Help, and Status" text screens, accessed by hitting the "?" key.   "%" increases a delay of the program's main loop completions, in increments of 1ms.   "]" will enable or disable an effort by the program to adjust the speed of the simulation to run at a standard rate on different processors or under different processor loads.

                Screens,       screens layout     screen     screen

                Further program notes, sphrspwa.txt.   Graphs.   Programmer's desk notes,


                I wrote this program at my home, in the summer of 2006, two months of full-time work for a program I wanted.   I wrote two other programs that year, 16-bit DOS programs.   Earlier in the year, I expanded an old rotating hypercube program from college, ncube we called it, written by two at a desk one evening, summer '95.   Toward the end of my '06 summer of code, I also wrote an elementary gravity simulation, a small program with rewarding runs, for me, to see some orbits and contemplate gravity.

                I've been meaning to write some more programs.   I wrote some excel_vba in 2008; this is a data merge utility from one column pair to another, by the key column keys.   Here's a 2002 basic program for playing with the Mandelbrot set, in qbasic.


                spherical surface ship fight, two-player game program, with flat space modes
                    port from 2006 pc-dos program, spherical spacewar

                    _______     ______________________________
                    _______         port from 2006 program                  
                    _______         finer graphical rendering                
                    _______         projection combination presets      
                    _______         clairaut's formula navigation, per-player keys
                    _______         three-p playable                              
                    _______         ball or disc shot, barrel, rail, or surface throw
                    _______         gravity, altitude, design issues        
                    _______         ship shapes, disc, zone, puck, igloo
                    _______         interface and play, design and tuning
                    _______     ______________________________

                spherical surface ship fight, two-player game program