Home » Personal collection » Acorn tapes » Electron_User » Electron_User_tape21a_acorn_eu_1991_april.wav » R.Spirals

R.Spirals

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 » Personal collection » Acorn tapes » Electron_User » Electron_User_tape21a_acorn_eu_1991_april.wav
Filename: R.Spirals
Read OK:
File size: 019C bytes
Load address: FFFF1A00
Exec address: FFFF8023
Duplicates

There are 3 duplicate copies of this file in the archive:

File contents
   10REM Spirals
   20REM by Justin Coombs
   30REM (c) The Micro User
   40MODE 0:PROCspiral(640,512,5,0,60,1,1):END
   50DEF PROCspiral(X%,Y%,revolutions%,degree%,gradient,quality%,colour%)
   60GCOL 0,colour%:MOVE X%,Y%
   70gradient=gradient/(360/quality%)
   80FOR I%=1 TO revolutions%*(360/quality%):degree%=degree%+quality%:IF degree%=360 THEN degree%=0
   90PX%=(SIN(RAD(degree%))*(I%*gradient))+X%:PY%=(COS(RAD(degree%))*(I%*gradient))+Y%:DRAW PX%,PY%
  100NEXT I%:ENDPROC


� Spirals
� by Justin Coombs
� (c) The Micro User
(%� 0:�spiral(640,512,5,0,60,1,1):�
2C� �spiral(X%,Y%,revolutions%,degree%,gradient,quality%,colour%)
<� 0,colour%:� X%,Y%
F$gradient=gradient/(360/quality%)
P[� I%=1 � revolutions%*(360/quality%):degree%=degree%+quality%:� degree%=360 � degree%=0
ZWPX%=(�(�(degree%))*(I%*gradient))+X%:PY%=(�(�(degree%))*(I%*gradient))+Y%:� PX%,PY%
d
� I%:�
�
00000000  0d 00 0a 0d f4 20 53 70  69 72 61 6c 73 0d 00 14  |..... Spirals...|
00000010  16 f4 20 62 79 20 4a 75  73 74 69 6e 20 43 6f 6f  |.. by Justin Coo|
00000020  6d 62 73 0d 00 1e 18 f4  20 28 63 29 20 54 68 65  |mbs..... (c) The|
00000030  20 4d 69 63 72 6f 20 55  73 65 72 0d 00 28 25 eb  | Micro User..(%.|
00000040  20 30 3a f2 73 70 69 72  61 6c 28 36 34 30 2c 35  | 0:.spiral(640,5|
00000050  31 32 2c 35 2c 30 2c 36  30 2c 31 2c 31 29 3a e0  |12,5,0,60,1,1):.|
00000060  0d 00 32 43 dd 20 f2 73  70 69 72 61 6c 28 58 25  |..2C. .spiral(X%|
00000070  2c 59 25 2c 72 65 76 6f  6c 75 74 69 6f 6e 73 25  |,Y%,revolutions%|
00000080  2c 64 65 67 72 65 65 25  2c 67 72 61 64 69 65 6e  |,degree%,gradien|
00000090  74 2c 71 75 61 6c 69 74  79 25 2c 63 6f 6c 6f 75  |t,quality%,colou|
000000a0  72 25 29 0d 00 3c 17 e6  20 30 2c 63 6f 6c 6f 75  |r%)..<.. 0,colou|
000000b0  72 25 3a ec 20 58 25 2c  59 25 0d 00 46 24 67 72  |r%:. X%,Y%..F$gr|
000000c0  61 64 69 65 6e 74 3d 67  72 61 64 69 65 6e 74 2f  |adient=gradient/|
000000d0  28 33 36 30 2f 71 75 61  6c 69 74 79 25 29 0d 00  |(360/quality%)..|
000000e0  50 5b e3 20 49 25 3d 31  20 b8 20 72 65 76 6f 6c  |P[. I%=1 . revol|
000000f0  75 74 69 6f 6e 73 25 2a  28 33 36 30 2f 71 75 61  |utions%*(360/qua|
00000100  6c 69 74 79 25 29 3a 64  65 67 72 65 65 25 3d 64  |lity%):degree%=d|
00000110  65 67 72 65 65 25 2b 71  75 61 6c 69 74 79 25 3a  |egree%+quality%:|
00000120  e7 20 64 65 67 72 65 65  25 3d 33 36 30 20 8c 20  |. degree%=360 . |
00000130  64 65 67 72 65 65 25 3d  30 0d 00 5a 57 50 58 25  |degree%=0..ZWPX%|
00000140  3d 28 b5 28 b2 28 64 65  67 72 65 65 25 29 29 2a  |=(.(.(degree%))*|
00000150  28 49 25 2a 67 72 61 64  69 65 6e 74 29 29 2b 58  |(I%*gradient))+X|
00000160  25 3a 50 59 25 3d 28 9b  28 b2 28 64 65 67 72 65  |%:PY%=(.(.(degre|
00000170  65 25 29 29 2a 28 49 25  2a 67 72 61 64 69 65 6e  |e%))*(I%*gradien|
00000180  74 29 29 2b 59 25 3a df  20 50 58 25 2c 50 59 25  |t))+Y%:. PX%,PY%|
00000190  0d 00 64 0a ed 20 49 25  3a e1 0d ff              |..d.. I%:...|
0000019c
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