StarInfo/Jeffs/DigiLava

Home » Archimedes archive » Acorn User » AU 1997-10 A.adf » Regulars » StarInfo/Jeffs/DigiLava

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 1997-10 A.adf » Regulars
Filename:	StarInfo/Jeffs/DigiLava
Read OK:	✔
File size:	0BDA bytes
Load address:	0000
Exec address:	0000

File contents

   10REM  Lava Lamp by R.W.Jeffs
   20
   30MODE 27:OFF
   40
   50VDU 23,224,255,255,255,255,255,255,255,255
   60DIM d1%(3,1),d2%(4,1)
   70
   80PROCcolours
   90PROCdirections
  100
  110w%=20:h%=50:sx%=(79-w%)/2:sy%=(59-h%)/2:REM  Arena dimensions
  120s%=80:REM  Max particles
  130heat%=895:half%=(heat%+1)DIV2-1:REM  Max heat
  140div%=(heat%+1) DIV 14:REM  Used to calc colour
  150tfr%=64:REM  +/-Heating amount at top and bottom
  160hzone%=3:REM  No. of lines in heating/cooling zones
  170rate%=8:REM  Thermal conductivity
  180
  190DIM arena%(w%+1,h%+1,1):REM  Particle, Temp
  200REM  Build arena walls
  210FOR B%=0 TO h%+1:FOR A%=0 TO w%+1:arena%(A%,B%,0)=0:arena%(A%,B%,1)=0:NEXT:NEXT
  220FOR A%=0 TO w%+1:arena%(A%,0,0)=s%+1:arena%(A%,h%+1,0)=s%+1:NEXT
  230FOR B%=0 TO h%+1:arena%(0,B%,0)=s%+1:arena%(w%+1,B%,0)=s%+1:NEXT
  240
  250DIM p%(s%,3):REM  X, Y, Temp, Char
  260REM  Create random temperature particles
  270FOR A%=1 TO s%
  280 REPEAT:X%=RND(w%):Y%=RND(h%):UNTIL arena%(X%,Y%,0)=0
  290 p%(A%,0)=X%:p%(A%,1)=Y%:p%(A%,2)=RND(heat%):p%(A%,3)=224:REM RND(26)+64
  300 arena%(X%,Y%,0)=A%:arena%(X%,Y%,1)=p%(A%,2)
  310NEXT
  320
  330REM  Draw arena contents
  340FOR B%=0 TO h%+1:FOR A%=0 TO w%+1
  350 CASE arena%(A%,B%,0) OF
  360  WHEN 0 : PRINTTAB(A%+sx%,B%+sy%);" "
  370  WHEN s%+1 : COLOUR 2:PRINTTAB(A%+sx%,B%+sy%);"#"
  380  OTHERWISE : Q%=arena%(A%,B%,0):COLOUR (p%(Q%,2))DIVdiv%+2:PRINTTAB(A%+sx%,B%+sy%);CHR$(p%(Q%,3))
  390 ENDCASE
  400NEXT:NEXT
  410
  420REPEAT:PROCcycle:UNTIL0
  430
  440END
  450
  460DEF PROCcycle
  470LOCAL A%,D%,x%,y%,ph%,dh%,E%
  480FOR A%=1 TO s%
  490 REM  Heat/cool
  500 IF p%(A%,1)=h% OR (p%(A%,1)>h%-hzone% AND p%(A%,2)>half%) THEN
  510  p%(A%,2)+=tfr%:IF p%(A%,2)>heat% p%(A%,2)=heat%
  520 ELSE
  530  IF p%(A%,1)=1 OR (p%(A%,1)<=hzone% AND p%(A%,2)<half%) p%(A%,2)-=tfr%:IF p%(A%,2)<0 p%(A%,2)=0
  540 ENDIF
  550 REM  Transfer heat from hotter particles
  560 ph%=p%(A%,2)
  570 FOR D%=0 TO 3
  580  x%=p%(A%,0)+d1%(D%,0):y%=p%(A%,1)+d1%(D%,1)
  590  dh%=arena%(x%,y%,1)-ph%
  600  IF dh%>0 dh%=dh%DIVrate%:ph%+=dh%:arena%(x%,y%,1)-=dh%:p%(arena%(x%,y%,0),2)-=dh%
  610 NEXT
  620 p%(A%,2)=ph%:arena%(p%(A%,0),p%(A%,1),1)=ph%
  630
  640 REM  Select direction of movement depending upon temperature
  650 IF ph%>half% ph%=-1 ELSE ph%=1
  660
  670 REM  Determine most preferable directions for movement
  680 P$="":Q$=""
  690 x%=p%(A%,0):y%=p%(A%,1)
  700 arena%(x%,y%,0)=0:arena%(x%,y%,1)=0
  710 FOR D%=0 TO 4
  720  IF arena%(x%+d2%(D%,0),y%+d2%(D%,1)*ph%,0)=0 THEN
  730   P$+=STR$(D%)
  740   E%=0
  750   REPEAT
  760    IF arena%(x%+d2%(D%,0)+d1%(E%,0),y%+d2%(D%,1)*ph%+d1%(E%,1),0)>0 Q$+=STR$(D%)
  770    E%+=1
  780   UNTIL E%=4
  790  ENDIF
  800 NEXT
  810
  820 REM  Move particle, or just redraw in case of colour change
  830 IF P$<>"" THEN
  840  PRINTTAB(x%+sx%,y%+sy%);" "
  850  IF Q$<>"" THEN
  860   IF LENQ$>1 Q$=MID$(Q$,RND(LENQ$),1)
  870   x%+=d2%(VAL(Q$),0):y%+=d2%(VAL(Q$),1)*ph%
  880  ELSE
  890   IF LENP$>1 P$=MID$(P$,RND(LENP$),1)
  900   x%+=d2%(VAL(P$),0):y%+=d2%(VAL(P$),1)*ph%
  910  ENDIF
  920  p%(A%,0)=x%:p%(A%,1)=y%
  930 ENDIF
  940 arena%(x%,y%,0)=A%:arena%(x%,y%,1)=p%(A%,2)
  950 COLOUR p%(A%,2)DIVdiv%+2
  960 PRINTTAB(x%+sx%,y%+sy%);CHR$(p%(A%,3))
  970NEXT
  980ENDPROC
  990
 1000DEF PROCcolours
 1010LOCAL C%,B%,R%
 1020B%=14:R%=1
 1030FOR C%=2 TO 15
 1040 COLOUR C%,R%*16,0,B%*16
 1050 B%-=1:R%+=1
 1060NEXT
 1070ENDPROC
 1080
 1090DEF PROCdirections
 1100LOCAL A%
 1110FOR A%=0 TO 3:READ d1%(A%,0),d1%(A%,1):NEXT
 1120FOR A%=0 TO 4:READ d2%(A%,0),d2%(A%,1):NEXT
 1130ENDPROC
 1140DATA 0,1,1,0,0,-1,-1,0
 1150DATA -1,0,-1,1,0,1,1,1,1,0
 1160


�  Lava Lamp by R.W.Jeffs


� 27:�
(
2,� 23,224,255,255,255,255,255,255,255,255
<� d1%(3,1),d2%(4,1)
F
P�colours
Z�directions
d
n?w%=20:h%=50:sx%=(79-w%)/2:sy%=(59-h%)/2:�  Arena dimensions
xs%=80:�  Max particles
�-heat%=895:half%=(heat%+1)�2-1:�  Max heat
�.div%=(heat%+1) � 14:�  Used to calc colour
�2tfr%=64:�  +/-Heating amount at top and bottom
�5hzone%=3:�  No. of lines in heating/cooling zones
�#rate%=8:�  Thermal conductivity
�
�+� arena%(w%+1,h%+1,1):�  Particle, Temp
��  Build arena walls
�G� B%=0 � h%+1:� A%=0 � w%+1:arena%(A%,B%,0)=0:arena%(A%,B%,1)=0:�:�
�>� A%=0 � w%+1:arena%(A%,0,0)=s%+1:arena%(A%,h%+1,0)=s%+1:�
�>� B%=0 � h%+1:arena%(0,B%,0)=s%+1:arena%(w%+1,B%,0)=s%+1:�
�
�"� p%(s%,3):�  X, Y, Temp, Char
*�  Create random temperature particles
� A%=1 � s%
, �:X%=�(w%):Y%=�(h%):� arena%(X%,Y%,0)=0
"H p%(A%,0)=X%:p%(A%,1)=Y%:p%(A%,2)=�(heat%):p%(A%,3)=224:� RND(26)+64
,0 arena%(X%,Y%,0)=A%:arena%(X%,Y%,1)=p%(A%,2)
6�
@
J�  Draw arena contents
T� B%=0 � h%+1:� A%=0 � w%+1
^ Ȏ arena%(A%,B%,0) �
h   � 0 : �A%+sx%,B%+sy%);" "
r'  � s%+1 : � 2:�A%+sx%,B%+sy%);"#"
|M   : Q%=arena%(A%,B%,0):� (p%(Q%,2))�div%+2:�A%+sx%,B%+sy%);�(p%(Q%,3))
� �
��:�
�
��:�cycle:�0
�
��
�
�� �cycle
�� A%,D%,x%,y%,ph%,dh%,E%
�� A%=1 � s%
� �  Heat/cool
�< � p%(A%,1)=h% � (p%(A%,1)>h%-hzone% � p%(A%,2)>half%) �
�4  p%(A%,2)+=tfr%:� p%(A%,2)>heat% p%(A%,2)=heat%
 �
_  � p%(A%,1)=1 � (p%(A%,1)<=hzone% � p%(A%,2)<half%) p%(A%,2)-=tfr%:� p%(A%,2)<0 p%(A%,2)=0
 �
&+ �  Transfer heat from hotter particles
0 ph%=p%(A%,2)
: � D%=0 � 3
D1  x%=p%(A%,0)+d1%(D%,0):y%=p%(A%,1)+d1%(D%,1)
N  dh%=arena%(x%,y%,1)-ph%
XT  � dh%>0 dh%=dh%�rate%:ph%+=dh%:arena%(x%,y%,1)-=dh%:p%(arena%(x%,y%,0),2)-=dh%
b �
l1 p%(A%,2)=ph%:arena%(p%(A%,0),p%(A%,1),1)=ph%
v
�? �  Select direction of movement depending upon temperature
� � ph%>half% ph%=-1 � ph%=1
�
�9 �  Determine most preferable directions for movement
� P$="":Q$=""
� x%=p%(A%,0):y%=p%(A%,1)
�( arena%(x%,y%,0)=0:arena%(x%,y%,1)=0
� � D%=0 � 4
�3  � arena%(x%+d2%(D%,0),y%+d2%(D%,1)*ph%,0)=0 �
�   P$+=�(D%)
�   E%=0
�   �
�Q    � arena%(x%+d2%(D%,0)+d1%(E%,0),y%+d2%(D%,1)*ph%+d1%(E%,1),0)>0 Q$+=�(D%)

    E%+=1

   � E%=4
  �
  �
*
4> �  Move particle, or just redraw in case of colour change
> � P$<>"" �
H  �x%+sx%,y%+sy%);" "
R  � Q$<>"" �
\   � �Q$>1 Q$=�Q$,�(�Q$),1)
f,   x%+=d2%(�(Q$),0):y%+=d2%(�(Q$),1)*ph%
p  �
z   � �P$>1 P$=�P$,�(�P$),1)
�,   x%+=d2%(�(P$),0):y%+=d2%(�(P$),1)*ph%
�  �
�  p%(A%,0)=x%:p%(A%,1)=y%
� �
�0 arena%(x%,y%,0)=A%:arena%(x%,y%,1)=p%(A%,2)
� � p%(A%,2)�div%+2
�! �x%+sx%,y%+sy%);�(p%(A%,3))
��
��
�
�� �colours
�� C%,B%,R%
�B%=14:R%=1
� C%=2 � 15
 � C%,R%*16,0,B%*16
 B%-=1:R%+=1
$�
.�
8
B� �directions
L� A%
V&� A%=0 � 3:� d1%(A%,0),d1%(A%,1):�
`&� A%=0 � 4:� d2%(A%,0),d2%(A%,1):�
j�
t� 0,1,1,0,0,-1,-1,0
~� -1,0,-1,1,0,1,1,1,1,0
�
�

00000000  0d 00 0a 1d f4 20 20 4c  61 76 61 20 4c 61 6d 70  |.....  Lava Lamp|
00000010  20 62 79 20 52 2e 57 2e  4a 65 66 66 73 0d 00 14  | by R.W.Jeffs...|
00000020  04 0d 00 1e 0a eb 20 32  37 3a 87 0d 00 28 04 0d  |...... 27:...(..|
00000030  00 32 2c ef 20 32 33 2c  32 32 34 2c 32 35 35 2c  |.2,. 23,224,255,|
00000040  32 35 35 2c 32 35 35 2c  32 35 35 2c 32 35 35 2c  |255,255,255,255,|
00000050  32 35 35 2c 32 35 35 2c  32 35 35 0d 00 3c 17 de  |255,255,255..<..|
00000060  20 64 31 25 28 33 2c 31  29 2c 64 32 25 28 34 2c  | d1%(3,1),d2%(4,|
00000070  31 29 0d 00 46 04 0d 00  50 0c f2 63 6f 6c 6f 75  |1)..F...P..colou|
00000080  72 73 0d 00 5a 0f f2 64  69 72 65 63 74 69 6f 6e  |rs..Z..direction|
00000090  73 0d 00 64 04 0d 00 6e  3f 77 25 3d 32 30 3a 68  |s..d...n?w%=20:h|
000000a0  25 3d 35 30 3a 73 78 25  3d 28 37 39 2d 77 25 29  |%=50:sx%=(79-w%)|
000000b0  2f 32 3a 73 79 25 3d 28  35 39 2d 68 25 29 2f 32  |/2:sy%=(59-h%)/2|
000000c0  3a f4 20 20 41 72 65 6e  61 20 64 69 6d 65 6e 73  |:.  Arena dimens|
000000d0  69 6f 6e 73 0d 00 78 1a  73 25 3d 38 30 3a f4 20  |ions..x.s%=80:. |
000000e0  20 4d 61 78 20 70 61 72  74 69 63 6c 65 73 0d 00  | Max particles..|
000000f0  82 2d 68 65 61 74 25 3d  38 39 35 3a 68 61 6c 66  |.-heat%=895:half|
00000100  25 3d 28 68 65 61 74 25  2b 31 29 81 32 2d 31 3a  |%=(heat%+1).2-1:|
00000110  f4 20 20 4d 61 78 20 68  65 61 74 0d 00 8c 2e 64  |.  Max heat....d|
00000120  69 76 25 3d 28 68 65 61  74 25 2b 31 29 20 81 20  |iv%=(heat%+1) . |
00000130  31 34 3a f4 20 20 55 73  65 64 20 74 6f 20 63 61  |14:.  Used to ca|
00000140  6c 63 20 63 6f 6c 6f 75  72 0d 00 96 32 74 66 72  |lc colour...2tfr|
00000150  25 3d 36 34 3a f4 20 20  2b 2f 2d 48 65 61 74 69  |%=64:.  +/-Heati|
00000160  6e 67 20 61 6d 6f 75 6e  74 20 61 74 20 74 6f 70  |ng amount at top|
00000170  20 61 6e 64 20 62 6f 74  74 6f 6d 0d 00 a0 35 68  | and bottom...5h|
00000180  7a 6f 6e 65 25 3d 33 3a  f4 20 20 4e 6f 2e 20 6f  |zone%=3:.  No. o|
00000190  66 20 6c 69 6e 65 73 20  69 6e 20 68 65 61 74 69  |f lines in heati|
000001a0  6e 67 2f 63 6f 6f 6c 69  6e 67 20 7a 6f 6e 65 73  |ng/cooling zones|
000001b0  0d 00 aa 23 72 61 74 65  25 3d 38 3a f4 20 20 54  |...#rate%=8:.  T|
000001c0  68 65 72 6d 61 6c 20 63  6f 6e 64 75 63 74 69 76  |hermal conductiv|
000001d0  69 74 79 0d 00 b4 04 0d  00 be 2b de 20 61 72 65  |ity.......+. are|
000001e0  6e 61 25 28 77 25 2b 31  2c 68 25 2b 31 2c 31 29  |na%(w%+1,h%+1,1)|
000001f0  3a f4 20 20 50 61 72 74  69 63 6c 65 2c 20 54 65  |:.  Particle, Te|
00000200  6d 70 0d 00 c8 18 f4 20  20 42 75 69 6c 64 20 61  |mp.....  Build a|
00000210  72 65 6e 61 20 77 61 6c  6c 73 0d 00 d2 47 e3 20  |rena walls...G. |
00000220  42 25 3d 30 20 b8 20 68  25 2b 31 3a e3 20 41 25  |B%=0 . h%+1:. A%|
00000230  3d 30 20 b8 20 77 25 2b  31 3a 61 72 65 6e 61 25  |=0 . w%+1:arena%|
00000240  28 41 25 2c 42 25 2c 30  29 3d 30 3a 61 72 65 6e  |(A%,B%,0)=0:aren|
00000250  61 25 28 41 25 2c 42 25  2c 31 29 3d 30 3a ed 3a  |a%(A%,B%,1)=0:.:|
00000260  ed 0d 00 dc 3e e3 20 41  25 3d 30 20 b8 20 77 25  |....>. A%=0 . w%|
00000270  2b 31 3a 61 72 65 6e 61  25 28 41 25 2c 30 2c 30  |+1:arena%(A%,0,0|
00000280  29 3d 73 25 2b 31 3a 61  72 65 6e 61 25 28 41 25  |)=s%+1:arena%(A%|
00000290  2c 68 25 2b 31 2c 30 29  3d 73 25 2b 31 3a ed 0d  |,h%+1,0)=s%+1:..|
000002a0  00 e6 3e e3 20 42 25 3d  30 20 b8 20 68 25 2b 31  |..>. B%=0 . h%+1|
000002b0  3a 61 72 65 6e 61 25 28  30 2c 42 25 2c 30 29 3d  |:arena%(0,B%,0)=|
000002c0  73 25 2b 31 3a 61 72 65  6e 61 25 28 77 25 2b 31  |s%+1:arena%(w%+1|
000002d0  2c 42 25 2c 30 29 3d 73  25 2b 31 3a ed 0d 00 f0  |,B%,0)=s%+1:....|
000002e0  04 0d 00 fa 22 de 20 70  25 28 73 25 2c 33 29 3a  |....". p%(s%,3):|
000002f0  f4 20 20 58 2c 20 59 2c  20 54 65 6d 70 2c 20 43  |.  X, Y, Temp, C|
00000300  68 61 72 0d 01 04 2a f4  20 20 43 72 65 61 74 65  |har...*.  Create|
00000310  20 72 61 6e 64 6f 6d 20  74 65 6d 70 65 72 61 74  | random temperat|
00000320  75 72 65 20 70 61 72 74  69 63 6c 65 73 0d 01 0e  |ure particles...|
00000330  0f e3 20 41 25 3d 31 20  b8 20 73 25 0d 01 18 2c  |.. A%=1 . s%...,|
00000340  20 f5 3a 58 25 3d b3 28  77 25 29 3a 59 25 3d b3  | .:X%=.(w%):Y%=.|
00000350  28 68 25 29 3a fd 20 61  72 65 6e 61 25 28 58 25  |(h%):. arena%(X%|
00000360  2c 59 25 2c 30 29 3d 30  0d 01 22 48 20 70 25 28  |,Y%,0)=0.."H p%(|
00000370  41 25 2c 30 29 3d 58 25  3a 70 25 28 41 25 2c 31  |A%,0)=X%:p%(A%,1|
00000380  29 3d 59 25 3a 70 25 28  41 25 2c 32 29 3d b3 28  |)=Y%:p%(A%,2)=.(|
00000390  68 65 61 74 25 29 3a 70  25 28 41 25 2c 33 29 3d  |heat%):p%(A%,3)=|
000003a0  32 32 34 3a f4 20 52 4e  44 28 32 36 29 2b 36 34  |224:. RND(26)+64|
000003b0  0d 01 2c 30 20 61 72 65  6e 61 25 28 58 25 2c 59  |..,0 arena%(X%,Y|
000003c0  25 2c 30 29 3d 41 25 3a  61 72 65 6e 61 25 28 58  |%,0)=A%:arena%(X|
000003d0  25 2c 59 25 2c 31 29 3d  70 25 28 41 25 2c 32 29  |%,Y%,1)=p%(A%,2)|
000003e0  0d 01 36 05 ed 0d 01 40  04 0d 01 4a 1a f4 20 20  |..6....@...J..  |
000003f0  44 72 61 77 20 61 72 65  6e 61 20 63 6f 6e 74 65  |Draw arena conte|
00000400  6e 74 73 0d 01 54 1f e3  20 42 25 3d 30 20 b8 20  |nts..T.. B%=0 . |
00000410  68 25 2b 31 3a e3 20 41  25 3d 30 20 b8 20 77 25  |h%+1:. A%=0 . w%|
00000420  2b 31 0d 01 5e 19 20 c8  8e 20 61 72 65 6e 61 25  |+1..^. .. arena%|
00000430  28 41 25 2c 42 25 2c 30  29 20 ca 0d 01 68 20 20  |(A%,B%,0) ...h  |
00000440  20 c9 20 30 20 3a 20 f1  8a 41 25 2b 73 78 25 2c  | . 0 : ..A%+sx%,|
00000450  42 25 2b 73 79 25 29 3b  22 20 22 0d 01 72 27 20  |B%+sy%);" "..r' |
00000460  20 c9 20 73 25 2b 31 20  3a 20 fb 20 32 3a f1 8a  | . s%+1 : . 2:..|
00000470  41 25 2b 73 78 25 2c 42  25 2b 73 79 25 29 3b 22  |A%+sx%,B%+sy%);"|
00000480  23 22 0d 01 7c 4d 20 20  7f 20 3a 20 51 25 3d 61  |#"..|M  . : Q%=a|
00000490  72 65 6e 61 25 28 41 25  2c 42 25 2c 30 29 3a fb  |rena%(A%,B%,0):.|
000004a0  20 28 70 25 28 51 25 2c  32 29 29 81 64 69 76 25  | (p%(Q%,2)).div%|
000004b0  2b 32 3a f1 8a 41 25 2b  73 78 25 2c 42 25 2b 73  |+2:..A%+sx%,B%+s|
000004c0  79 25 29 3b bd 28 70 25  28 51 25 2c 33 29 29 0d  |y%);.(p%(Q%,3)).|
000004d0  01 86 06 20 cb 0d 01 90  07 ed 3a ed 0d 01 9a 04  |... ......:.....|
000004e0  0d 01 a4 0f f5 3a f2 63  79 63 6c 65 3a fd 30 0d  |.....:.cycle:.0.|
000004f0  01 ae 04 0d 01 b8 05 e0  0d 01 c2 04 0d 01 cc 0c  |................|
00000500  dd 20 f2 63 79 63 6c 65  0d 01 d6 1c ea 20 41 25  |. .cycle..... A%|
00000510  2c 44 25 2c 78 25 2c 79  25 2c 70 68 25 2c 64 68  |,D%,x%,y%,ph%,dh|
00000520  25 2c 45 25 0d 01 e0 0f  e3 20 41 25 3d 31 20 b8  |%,E%..... A%=1 .|
00000530  20 73 25 0d 01 ea 11 20  f4 20 20 48 65 61 74 2f  | s%.... .  Heat/|
00000540  63 6f 6f 6c 0d 01 f4 3c  20 e7 20 70 25 28 41 25  |cool...< . p%(A%|
00000550  2c 31 29 3d 68 25 20 84  20 28 70 25 28 41 25 2c  |,1)=h% . (p%(A%,|
00000560  31 29 3e 68 25 2d 68 7a  6f 6e 65 25 20 80 20 70  |1)>h%-hzone% . p|
00000570  25 28 41 25 2c 32 29 3e  68 61 6c 66 25 29 20 8c  |%(A%,2)>half%) .|
00000580  0d 01 fe 34 20 20 70 25  28 41 25 2c 32 29 2b 3d  |...4  p%(A%,2)+=|
00000590  74 66 72 25 3a e7 20 70  25 28 41 25 2c 32 29 3e  |tfr%:. p%(A%,2)>|
000005a0  68 65 61 74 25 20 70 25  28 41 25 2c 32 29 3d 68  |heat% p%(A%,2)=h|
000005b0  65 61 74 25 0d 02 08 06  20 cc 0d 02 12 5f 20 20  |eat%.... ...._  |
000005c0  e7 20 70 25 28 41 25 2c  31 29 3d 31 20 84 20 28  |. p%(A%,1)=1 . (|
000005d0  70 25 28 41 25 2c 31 29  3c 3d 68 7a 6f 6e 65 25  |p%(A%,1)<=hzone%|
000005e0  20 80 20 70 25 28 41 25  2c 32 29 3c 68 61 6c 66  | . p%(A%,2)<half|
000005f0  25 29 20 70 25 28 41 25  2c 32 29 2d 3d 74 66 72  |%) p%(A%,2)-=tfr|
00000600  25 3a e7 20 70 25 28 41  25 2c 32 29 3c 30 20 70  |%:. p%(A%,2)<0 p|
00000610  25 28 41 25 2c 32 29 3d  30 0d 02 1c 06 20 cd 0d  |%(A%,2)=0.... ..|
00000620  02 26 2b 20 f4 20 20 54  72 61 6e 73 66 65 72 20  |.&+ .  Transfer |
00000630  68 65 61 74 20 66 72 6f  6d 20 68 6f 74 74 65 72  |heat from hotter|
00000640  20 70 61 72 74 69 63 6c  65 73 0d 02 30 11 20 70  | particles..0. p|
00000650  68 25 3d 70 25 28 41 25  2c 32 29 0d 02 3a 0f 20  |h%=p%(A%,2)..:. |
00000660  e3 20 44 25 3d 30 20 b8  20 33 0d 02 44 31 20 20  |. D%=0 . 3..D1  |
00000670  78 25 3d 70 25 28 41 25  2c 30 29 2b 64 31 25 28  |x%=p%(A%,0)+d1%(|
00000680  44 25 2c 30 29 3a 79 25  3d 70 25 28 41 25 2c 31  |D%,0):y%=p%(A%,1|
00000690  29 2b 64 31 25 28 44 25  2c 31 29 0d 02 4e 1d 20  |)+d1%(D%,1)..N. |
000006a0  20 64 68 25 3d 61 72 65  6e 61 25 28 78 25 2c 79  | dh%=arena%(x%,y|
000006b0  25 2c 31 29 2d 70 68 25  0d 02 58 54 20 20 e7 20  |%,1)-ph%..XT  . |
000006c0  64 68 25 3e 30 20 64 68  25 3d 64 68 25 81 72 61  |dh%>0 dh%=dh%.ra|
000006d0  74 65 25 3a 70 68 25 2b  3d 64 68 25 3a 61 72 65  |te%:ph%+=dh%:are|
000006e0  6e 61 25 28 78 25 2c 79  25 2c 31 29 2d 3d 64 68  |na%(x%,y%,1)-=dh|
000006f0  25 3a 70 25 28 61 72 65  6e 61 25 28 78 25 2c 79  |%:p%(arena%(x%,y|
00000700  25 2c 30 29 2c 32 29 2d  3d 64 68 25 0d 02 62 06  |%,0),2)-=dh%..b.|
00000710  20 ed 0d 02 6c 31 20 70  25 28 41 25 2c 32 29 3d  | ...l1 p%(A%,2)=|
00000720  70 68 25 3a 61 72 65 6e  61 25 28 70 25 28 41 25  |ph%:arena%(p%(A%|
00000730  2c 30 29 2c 70 25 28 41  25 2c 31 29 2c 31 29 3d  |,0),p%(A%,1),1)=|
00000740  70 68 25 0d 02 76 04 0d  02 80 3f 20 f4 20 20 53  |ph%..v....? .  S|
00000750  65 6c 65 63 74 20 64 69  72 65 63 74 69 6f 6e 20  |elect direction |
00000760  6f 66 20 6d 6f 76 65 6d  65 6e 74 20 64 65 70 65  |of movement depe|
00000770  6e 64 69 6e 67 20 75 70  6f 6e 20 74 65 6d 70 65  |nding upon tempe|
00000780  72 61 74 75 72 65 0d 02  8a 1f 20 e7 20 70 68 25  |rature.... . ph%|
00000790  3e 68 61 6c 66 25 20 70  68 25 3d 2d 31 20 8b 20  |>half% ph%=-1 . |
000007a0  70 68 25 3d 31 0d 02 94  04 0d 02 9e 39 20 f4 20  |ph%=1.......9 . |
000007b0  20 44 65 74 65 72 6d 69  6e 65 20 6d 6f 73 74 20  | Determine most |
000007c0  70 72 65 66 65 72 61 62  6c 65 20 64 69 72 65 63  |preferable direc|
000007d0  74 69 6f 6e 73 20 66 6f  72 20 6d 6f 76 65 6d 65  |tions for moveme|
000007e0  6e 74 0d 02 a8 10 20 50  24 3d 22 22 3a 51 24 3d  |nt.... P$="":Q$=|
000007f0  22 22 0d 02 b2 1c 20 78  25 3d 70 25 28 41 25 2c  |"".... x%=p%(A%,|
00000800  30 29 3a 79 25 3d 70 25  28 41 25 2c 31 29 0d 02  |0):y%=p%(A%,1)..|
00000810  bc 28 20 61 72 65 6e 61  25 28 78 25 2c 79 25 2c  |.( arena%(x%,y%,|
00000820  30 29 3d 30 3a 61 72 65  6e 61 25 28 78 25 2c 79  |0)=0:arena%(x%,y|
00000830  25 2c 31 29 3d 30 0d 02  c6 0f 20 e3 20 44 25 3d  |%,1)=0.... . D%=|
00000840  30 20 b8 20 34 0d 02 d0  33 20 20 e7 20 61 72 65  |0 . 4...3  . are|
00000850  6e 61 25 28 78 25 2b 64  32 25 28 44 25 2c 30 29  |na%(x%+d2%(D%,0)|
00000860  2c 79 25 2b 64 32 25 28  44 25 2c 31 29 2a 70 68  |,y%+d2%(D%,1)*ph|
00000870  25 2c 30 29 3d 30 20 8c  0d 02 da 10 20 20 20 50  |%,0)=0 .....   P|
00000880  24 2b 3d c3 28 44 25 29  0d 02 e4 0b 20 20 20 45  |$+=.(D%)....   E|
00000890  25 3d 30 0d 02 ee 08 20  20 20 f5 0d 02 f8 51 20  |%=0....   ....Q |
000008a0  20 20 20 e7 20 61 72 65  6e 61 25 28 78 25 2b 64  |   . arena%(x%+d|
000008b0  32 25 28 44 25 2c 30 29  2b 64 31 25 28 45 25 2c  |2%(D%,0)+d1%(E%,|
000008c0  30 29 2c 79 25 2b 64 32  25 28 44 25 2c 31 29 2a  |0),y%+d2%(D%,1)*|
000008d0  70 68 25 2b 64 31 25 28  45 25 2c 31 29 2c 30 29  |ph%+d1%(E%,1),0)|
000008e0  3e 30 20 51 24 2b 3d c3  28 44 25 29 0d 03 02 0d  |>0 Q$+=.(D%)....|
000008f0  20 20 20 20 45 25 2b 3d  31 0d 03 0c 0d 20 20 20  |    E%+=1....   |
00000900  fd 20 45 25 3d 34 0d 03  16 07 20 20 cd 0d 03 20  |. E%=4....  ... |
00000910  06 20 ed 0d 03 2a 04 0d  03 34 3e 20 f4 20 20 4d  |. ...*...4> .  M|
00000920  6f 76 65 20 70 61 72 74  69 63 6c 65 2c 20 6f 72  |ove particle, or|
00000930  20 6a 75 73 74 20 72 65  64 72 61 77 20 69 6e 20  | just redraw in |
00000940  63 61 73 65 20 6f 66 20  63 6f 6c 6f 75 72 20 63  |case of colour c|
00000950  68 61 6e 67 65 0d 03 3e  0f 20 e7 20 50 24 3c 3e  |hange..>. . P$<>|
00000960  22 22 20 8c 0d 03 48 1a  20 20 f1 8a 78 25 2b 73  |"" ...H.  ..x%+s|
00000970  78 25 2c 79 25 2b 73 79  25 29 3b 22 20 22 0d 03  |x%,y%+sy%);" "..|
00000980  52 10 20 20 e7 20 51 24  3c 3e 22 22 20 8c 0d 03  |R.  . Q$<>"" ...|
00000990  5c 1f 20 20 20 e7 20 a9  51 24 3e 31 20 51 24 3d  |\.   . .Q$>1 Q$=|
000009a0  c1 51 24 2c b3 28 a9 51  24 29 2c 31 29 0d 03 66  |.Q$,.(.Q$),1)..f|
000009b0  2c 20 20 20 78 25 2b 3d  64 32 25 28 bb 28 51 24  |,   x%+=d2%(.(Q$|
000009c0  29 2c 30 29 3a 79 25 2b  3d 64 32 25 28 bb 28 51  |),0):y%+=d2%(.(Q|
000009d0  24 29 2c 31 29 2a 70 68  25 0d 03 70 07 20 20 cc  |$),1)*ph%..p.  .|
000009e0  0d 03 7a 1f 20 20 20 e7  20 a9 50 24 3e 31 20 50  |..z.   . .P$>1 P|
000009f0  24 3d c1 50 24 2c b3 28  a9 50 24 29 2c 31 29 0d  |$=.P$,.(.P$),1).|
00000a00  03 84 2c 20 20 20 78 25  2b 3d 64 32 25 28 bb 28  |..,   x%+=d2%(.(|
00000a10  50 24 29 2c 30 29 3a 79  25 2b 3d 64 32 25 28 bb  |P$),0):y%+=d2%(.|
00000a20  28 50 24 29 2c 31 29 2a  70 68 25 0d 03 8e 07 20  |(P$),1)*ph%.... |
00000a30  20 cd 0d 03 98 1d 20 20  70 25 28 41 25 2c 30 29  | .....  p%(A%,0)|
00000a40  3d 78 25 3a 70 25 28 41  25 2c 31 29 3d 79 25 0d  |=x%:p%(A%,1)=y%.|
00000a50  03 a2 06 20 cd 0d 03 ac  30 20 61 72 65 6e 61 25  |... ....0 arena%|
00000a60  28 78 25 2c 79 25 2c 30  29 3d 41 25 3a 61 72 65  |(x%,y%,0)=A%:are|
00000a70  6e 61 25 28 78 25 2c 79  25 2c 31 29 3d 70 25 28  |na%(x%,y%,1)=p%(|
00000a80  41 25 2c 32 29 0d 03 b6  16 20 fb 20 70 25 28 41  |A%,2).... . p%(A|
00000a90  25 2c 32 29 81 64 69 76  25 2b 32 0d 03 c0 21 20  |%,2).div%+2...! |
00000aa0  f1 8a 78 25 2b 73 78 25  2c 79 25 2b 73 79 25 29  |..x%+sx%,y%+sy%)|
00000ab0  3b bd 28 70 25 28 41 25  2c 33 29 29 0d 03 ca 05  |;.(p%(A%,3))....|
00000ac0  ed 0d 03 d4 05 e1 0d 03  de 04 0d 03 e8 0e dd 20  |............... |
00000ad0  f2 63 6f 6c 6f 75 72 73  0d 03 f2 0e ea 20 43 25  |.colours..... C%|
00000ae0  2c 42 25 2c 52 25 0d 03  fc 0e 42 25 3d 31 34 3a  |,B%,R%....B%=14:|
00000af0  52 25 3d 31 0d 04 06 0f  e3 20 43 25 3d 32 20 b8  |R%=1..... C%=2 .|
00000b00  20 31 35 0d 04 10 17 20  fb 20 43 25 2c 52 25 2a  | 15.... . C%,R%*|
00000b10  31 36 2c 30 2c 42 25 2a  31 36 0d 04 1a 10 20 42  |16,0,B%*16.... B|
00000b20  25 2d 3d 31 3a 52 25 2b  3d 31 0d 04 24 05 ed 0d  |%-=1:R%+=1..$...|
00000b30  04 2e 05 e1 0d 04 38 04  0d 04 42 11 dd 20 f2 64  |......8...B.. .d|
00000b40  69 72 65 63 74 69 6f 6e  73 0d 04 4c 08 ea 20 41  |irections..L.. A|
00000b50  25 0d 04 56 26 e3 20 41  25 3d 30 20 b8 20 33 3a  |%..V&. A%=0 . 3:|
00000b60  f3 20 64 31 25 28 41 25  2c 30 29 2c 64 31 25 28  |. d1%(A%,0),d1%(|
00000b70  41 25 2c 31 29 3a ed 0d  04 60 26 e3 20 41 25 3d  |A%,1):...`&. A%=|
00000b80  30 20 b8 20 34 3a f3 20  64 32 25 28 41 25 2c 30  |0 . 4:. d2%(A%,0|
00000b90  29 2c 64 32 25 28 41 25  2c 31 29 3a ed 0d 04 6a  |),d2%(A%,1):...j|
00000ba0  05 e1 0d 04 74 17 dc 20  30 2c 31 2c 31 2c 30 2c  |....t.. 0,1,1,0,|
00000bb0  30 2c 2d 31 2c 2d 31 2c  30 0d 04 7e 1b dc 20 2d  |0,-1,-1,0..~.. -|
00000bc0  31 2c 30 2c 2d 31 2c 31  2c 30 2c 31 2c 31 2c 31  |1,0,-1,1,0,1,1,1|
00000bd0  2c 31 2c 30 0d 04 88 04  0d ff                    |,1,0......|
00000bda

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