Home » Archimedes archive » Acorn User » AU 1994-10.adf » !StarInfo_StarInfo » VanMourik/CandyText
VanMourik/CandyText
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1994-10.adf » !StarInfo_StarInfo |
| Filename: | VanMourik/CandyText |
| Read OK: | ✔ |
| File size: | 0563 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
THE 'CANDY' CELLULAR AUTOMATON ------------------------------ THIS ROUTINE USES 2 ARRAYS TO RECORD PIXELS AT THE ACTIVE EDGES. X%() RECORDS THE X COMPONENTS OF THE COORDINATES OF THESE PIXELS, Y%() RECORDS THE Y COMPONENTS. THE EDGES EXTEND WHILE THE TEXTURE GROWS IN SIZE. EACH ACTIVE PIXEL IS PROCESSED SUCH THAT IF NEIGHBOURING PIXELS ARE FOUND TO BE IN BACKGROUND COLOUR (BLACK) THEN THESE COORDINATES ARE ADDED TO THE LIST. PIXELS ARE CHOSEN AT RANDOM FROM THE ARRAYS FOR PROCESSING. A COUNTER KEEPS RECORD OF HOW MANY COORDINATES ARE STORED. SO THE ACTIVE- EDGE-PIXEL-COORDINATES LISTING CONSTANTLY WAXES AND WANES IN SIZE. ACCORDING TO THE DIRECTION OF GROWTH (ON OF 8), THE PIXEL ACQUIRES A COLOUR. THE CENTRAL PIXEL THEN BECOMES ENCLOSED AND IS ERASED FROM THE ARRAYS BY OVERWRITING IT WITH THE LAST ENTRY, AND THE LISTING'S SIZE IS ADJUSTED. THIS PROCESS IS REPEATED UNTIL THE SCREEN IS FILLED WITH A TEXTURE. I CALLED IT 'CANDY' BECAUSE THAT IS WHAT IT LOOKS LIKE, MOUTAINS OF CANDY. THERE IS ANOTHER IMPLEMENTATION OF THIS ROUTINE CALLED 'MAZE'. IN THIS ROUTINE A MAZE IS FLOODED WITH A 'CANDY' TEXTURE. ONE CAN ALSO OBSERVE THE PROCESS MAGNIFIED AT THE POINTER'S POSITION. JEAN VAN MOURIK THIRD MILLENNIUM MILL COTTAGE DERWYDD AMMANFORD DYFED SA18 3LQ UNITED KINGDOM
00000000 0a 20 20 20 54 48 45 20 27 43 41 4e 44 59 27 20 |. THE 'CANDY' | 00000010 43 45 4c 4c 55 4c 41 52 20 41 55 54 4f 4d 41 54 |CELLULAR AUTOMAT| 00000020 4f 4e 0a 20 20 20 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |ON. ----------| 00000030 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 00000040 2d 2d 2d 2d 0a 0a 20 20 20 54 48 49 53 20 52 4f |----.. THIS RO| 00000050 55 54 49 4e 45 20 55 53 45 53 20 32 20 41 52 52 |UTINE USES 2 ARR| 00000060 41 59 53 20 54 4f 20 52 45 43 4f 52 44 20 50 49 |AYS TO RECORD PI| 00000070 58 45 4c 53 20 41 54 20 54 48 45 20 41 43 54 49 |XELS AT THE ACTI| 00000080 56 45 20 45 44 47 45 53 2e 0a 20 20 20 58 25 28 |VE EDGES.. X%(| 00000090 29 20 52 45 43 4f 52 44 53 20 54 48 45 20 58 20 |) RECORDS THE X | 000000a0 43 4f 4d 50 4f 4e 45 4e 54 53 20 4f 46 20 54 48 |COMPONENTS OF TH| 000000b0 45 20 43 4f 4f 52 44 49 4e 41 54 45 53 20 4f 46 |E COORDINATES OF| 000000c0 20 54 48 45 53 45 20 50 49 58 45 4c 53 2c 0a 20 | THESE PIXELS,. | 000000d0 20 20 59 25 28 29 20 52 45 43 4f 52 44 53 20 54 | Y%() RECORDS T| 000000e0 48 45 20 59 20 43 4f 4d 50 4f 4e 45 4e 54 53 2e |HE Y COMPONENTS.| 000000f0 0a 20 20 20 54 48 45 20 45 44 47 45 53 20 45 58 |. THE EDGES EX| 00000100 54 45 4e 44 20 57 48 49 4c 45 20 54 48 45 20 54 |TEND WHILE THE T| 00000110 45 58 54 55 52 45 20 47 52 4f 57 53 20 49 4e 20 |EXTURE GROWS IN | 00000120 53 49 5a 45 2e 20 20 45 41 43 48 20 41 43 54 49 |SIZE. EACH ACTI| 00000130 56 45 20 50 49 58 45 4c 0a 20 20 20 49 53 20 50 |VE PIXEL. IS P| 00000140 52 4f 43 45 53 53 45 44 20 53 55 43 48 20 54 48 |ROCESSED SUCH TH| 00000150 41 54 20 49 46 20 4e 45 49 47 48 42 4f 55 52 49 |AT IF NEIGHBOURI| 00000160 4e 47 20 50 49 58 45 4c 53 20 41 52 45 20 46 4f |NG PIXELS ARE FO| 00000170 55 4e 44 20 54 4f 20 42 45 20 49 4e 20 0a 20 20 |UND TO BE IN . | 00000180 20 42 41 43 4b 47 52 4f 55 4e 44 20 43 4f 4c 4f | BACKGROUND COLO| 00000190 55 52 20 28 42 4c 41 43 4b 29 20 54 48 45 4e 20 |UR (BLACK) THEN | 000001a0 54 48 45 53 45 20 43 4f 4f 52 44 49 4e 41 54 45 |THESE COORDINATE| 000001b0 53 20 41 52 45 20 41 44 44 45 44 20 54 4f 20 54 |S ARE ADDED TO T| 000001c0 48 45 20 4c 49 53 54 2e 0a 20 20 20 50 49 58 45 |HE LIST.. PIXE| 000001d0 4c 53 20 41 52 45 20 43 48 4f 53 45 4e 20 41 54 |LS ARE CHOSEN AT| 000001e0 20 52 41 4e 44 4f 4d 20 46 52 4f 4d 20 54 48 45 | RANDOM FROM THE| 000001f0 20 41 52 52 41 59 53 20 46 4f 52 20 50 52 4f 43 | ARRAYS FOR PROC| 00000200 45 53 53 49 4e 47 2e 0a 20 20 20 41 20 43 4f 55 |ESSING.. A COU| 00000210 4e 54 45 52 20 4b 45 45 50 53 20 52 45 43 4f 52 |NTER KEEPS RECOR| 00000220 44 20 4f 46 20 48 4f 57 20 4d 41 4e 59 20 43 4f |D OF HOW MANY CO| 00000230 4f 52 44 49 4e 41 54 45 53 20 41 52 45 20 53 54 |ORDINATES ARE ST| 00000240 4f 52 45 44 2e 20 20 53 4f 20 54 48 45 20 41 43 |ORED. SO THE AC| 00000250 54 49 56 45 2d 0a 20 20 20 45 44 47 45 2d 50 49 |TIVE-. EDGE-PI| 00000260 58 45 4c 2d 43 4f 4f 52 44 49 4e 41 54 45 53 20 |XEL-COORDINATES | 00000270 4c 49 53 54 49 4e 47 20 43 4f 4e 53 54 41 4e 54 |LISTING CONSTANT| 00000280 4c 59 20 57 41 58 45 53 20 41 4e 44 20 57 41 4e |LY WAXES AND WAN| 00000290 45 53 20 49 4e 20 53 49 5a 45 2e 0a 20 20 20 41 |ES IN SIZE.. A| 000002a0 43 43 4f 52 44 49 4e 47 20 54 4f 20 54 48 45 20 |CCORDING TO THE | 000002b0 44 49 52 45 43 54 49 4f 4e 20 4f 46 20 47 52 4f |DIRECTION OF GRO| 000002c0 57 54 48 20 28 4f 4e 20 4f 46 20 38 29 2c 20 54 |WTH (ON OF 8), T| 000002d0 48 45 20 50 49 58 45 4c 20 41 43 51 55 49 52 45 |HE PIXEL ACQUIRE| 000002e0 53 20 41 20 0a 20 20 20 43 4f 4c 4f 55 52 2e 0a |S A . COLOUR..| 000002f0 20 20 20 54 48 45 20 43 45 4e 54 52 41 4c 20 50 | THE CENTRAL P| 00000300 49 58 45 4c 20 54 48 45 4e 20 42 45 43 4f 4d 45 |IXEL THEN BECOME| 00000310 53 20 45 4e 43 4c 4f 53 45 44 20 41 4e 44 20 49 |S ENCLOSED AND I| 00000320 53 20 45 52 41 53 45 44 20 46 52 4f 4d 20 54 48 |S ERASED FROM TH| 00000330 45 20 41 52 52 41 59 53 20 42 59 0a 20 20 20 4f |E ARRAYS BY. O| 00000340 56 45 52 57 52 49 54 49 4e 47 20 49 54 20 57 49 |VERWRITING IT WI| 00000350 54 48 20 54 48 45 20 4c 41 53 54 20 45 4e 54 52 |TH THE LAST ENTR| 00000360 59 2c 20 41 4e 44 20 54 48 45 20 4c 49 53 54 49 |Y, AND THE LISTI| 00000370 4e 47 27 53 20 53 49 5a 45 20 49 53 20 41 44 4a |NG'S SIZE IS ADJ| 00000380 55 53 54 45 44 2e 0a 20 20 20 54 48 49 53 20 50 |USTED.. THIS P| 00000390 52 4f 43 45 53 53 20 49 53 20 52 45 50 45 41 54 |ROCESS IS REPEAT| 000003a0 45 44 20 55 4e 54 49 4c 20 54 48 45 20 53 43 52 |ED UNTIL THE SCR| 000003b0 45 45 4e 20 49 53 20 46 49 4c 4c 45 44 20 57 49 |EEN IS FILLED WI| 000003c0 54 48 20 41 20 54 45 58 54 55 52 45 2e 0a 20 20 |TH A TEXTURE.. | 000003d0 20 49 20 43 41 4c 4c 45 44 20 49 54 20 27 43 41 | I CALLED IT 'CA| 000003e0 4e 44 59 27 20 42 45 43 41 55 53 45 20 54 48 41 |NDY' BECAUSE THA| 000003f0 54 20 49 53 20 57 48 41 54 20 49 54 20 4c 4f 4f |T IS WHAT IT LOO| 00000400 4b 53 20 4c 49 4b 45 2c 20 4d 4f 55 54 41 49 4e |KS LIKE, MOUTAIN| 00000410 53 20 4f 46 20 43 41 4e 44 59 2e 0a 20 20 20 54 |S OF CANDY.. T| 00000420 48 45 52 45 20 49 53 20 41 4e 4f 54 48 45 52 20 |HERE IS ANOTHER | 00000430 49 4d 50 4c 45 4d 45 4e 54 41 54 49 4f 4e 20 4f |IMPLEMENTATION O| 00000440 46 20 54 48 49 53 20 52 4f 55 54 49 4e 45 20 43 |F THIS ROUTINE C| 00000450 41 4c 4c 45 44 20 27 4d 41 5a 45 27 2e 20 20 49 |ALLED 'MAZE'. I| 00000460 4e 20 54 48 49 53 0a 20 20 20 52 4f 55 54 49 4e |N THIS. ROUTIN| 00000470 45 20 41 20 4d 41 5a 45 20 49 53 20 46 4c 4f 4f |E A MAZE IS FLOO| 00000480 44 45 44 20 57 49 54 48 20 41 20 27 43 41 4e 44 |DED WITH A 'CAND| 00000490 59 27 20 54 45 58 54 55 52 45 2e 20 20 4f 4e 45 |Y' TEXTURE. ONE| 000004a0 20 43 41 4e 20 41 4c 53 4f 20 4f 42 53 45 52 56 | CAN ALSO OBSERV| 000004b0 45 0a 20 20 20 54 48 45 20 50 52 4f 43 45 53 53 |E. THE PROCESS| 000004c0 20 4d 41 47 4e 49 46 49 45 44 20 41 54 20 54 48 | MAGNIFIED AT TH| 000004d0 45 20 50 4f 49 4e 54 45 52 27 53 20 50 4f 53 49 |E POINTER'S POSI| 000004e0 54 49 4f 4e 2e 0a 20 20 20 0a 0a 20 20 20 4a 45 |TION.. .. JE| 000004f0 41 4e 20 56 41 4e 20 4d 4f 55 52 49 4b 0a 20 20 |AN VAN MOURIK. | 00000500 20 54 48 49 52 44 20 4d 49 4c 4c 45 4e 4e 49 55 | THIRD MILLENNIU| 00000510 4d 0a 20 20 20 4d 49 4c 4c 20 43 4f 54 54 41 47 |M. MILL COTTAG| 00000520 45 0a 20 20 20 44 45 52 57 59 44 44 0a 20 20 20 |E. DERWYDD. | 00000530 41 4d 4d 41 4e 46 4f 52 44 0a 20 20 20 44 59 46 |AMMANFORD. DYF| 00000540 45 44 20 20 20 53 41 31 38 20 33 4c 51 0a 20 20 |ED SA18 3LQ. | 00000550 20 55 4e 49 54 45 44 20 4b 49 4e 47 44 4f 4d 20 | UNITED KINGDOM | 00000560 20 20 20 | | 00000563
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