StarInfo/Northcott/3dblobs2

Home » Archimedes archive » Acorn User » AU 1996-08.adf » Regulars » StarInfo/Northcott/3dblobs2

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 1996-08.adf » Regulars
Filename:	StarInfo/Northcott/3dblobs2
Read OK:	✔
File size:	0866 bytes
Load address:	0000
Exec address:	0000

File contents

   10REM >3dblobs2
   20REM Very simple program to plot some psuedo 3d blobs onto the
   30REM screen and control position with the mouse.
   40REM Conceived and Created by D.Northcott 06/03/1996
   50REM Originally was going to have a number of objects from which
   60REM to choose, however, because I wanted the program to run at
   70REM an acceptable speed on ALL Acorn 32-bit machines, that idea
   80REM went out the window, would have meant 2 sets of position
   90REM data, 1 for each speed type, cached & uncached, as each
  100REM speed uses a different number of blobs.
  110
  120REM Twice the screen memory we need, useful for shadow screen
  130REM use. THIS program uses 320x 256y 256c, could just as well
  140REM be ANY 256 colour mode.
  150mode%=13
  160MODE mode%
  170MODE mode%+128
  180
  190REM Error handler
  200ONERROR PROCER:END
  210REMove the cursor
  220OFF
  230PRINT "Mouse moves plot origin,"
  240PRINT " Click MIDDLE to exit,"
  250G%=INKEY(300)
  260
  270T%=TIME
  280FORA%=0TO10000:NEXT
  290T%=TIME-T%
  300IF T%>7 AA%=15 ELSE AA%=30
  310
  320DIM C%(AA%,1),X%(AA%,1),Y%(AA%,1),Z%(AA%,1),C(360),S(360)
  330FOR A%=0 TO 360
  340S(A%)=SIN(RAD(A%)):C(A%)=COS(RAD(A%)):NEXT
  350
  360B%=0:C%=1
  370SYS 6,112,B%:SYS 6,113,C%
  380MOUSE TO 640,512
  390S%=500
  400M%=S%*2
  410R%=0
  420V%=7
  430W%=8
  440FOR A%=1 TO AA%
  450C%(A%,0)=RND(62)+1
  460X%(A%,0)=RND(M%)-S%
  470Y%(A%,0)=RND(M%)-S%
  480Z%(A%,0)=RND(M%)-S%
  490NEXT
  500CLS
  510REM sorry about the non readability of the section below, speed demands
  520REM compact code, not easy to read code, essentially its calculating the
  530REM coordinates for the next frame, then sorting in the Z plane,
  540REM plotting the sorted blobs to the hidden screen bank, then swapping
  550REM the banks, simple really, or should that be really simple.
  560
  570REPEAT:C=C(R%):S=S(R%):FORA%=1TOAA%
  580C%(A%,1)=C%(A%,0):Y%(A%,1)=Y%(A%,0):X%(A%,1)=C*X%(A%,0)-S*Z%(A%,0):Z%(A%,1)=(S*X%(A%,0)+C*Z%(A%,0)+S%)/W%:NEXT
  590R%=(R%+V%)MOD360:FORI%=1TOAA%-1
  600K%=I%:FORJ%=I%+1TOAA%
  610IFZ%(J%,1)<Z%(K%,1) K%=J%
  620NEXT
  630IFI%<>K% SWAPZ%(K%,1),Z%(I%,1):SWAPY%(K%,1),Y%(I%,1):SWAPX%(K%,1),X%(I%,1):SWAPC%(K%,1),C%(I%,1)
  640NEXT
  650MOUSEX%,Y%,P%:FORA%=1TOAA%
  660GCOL0,C%(A%,1):CIRCLEFILLX%(A%,1)+X%,Y%(A%,1)+Y%,Z%(A%,1):NEXT
  670WAIT:SWAPB%,C%:SYS6,112,B%:SYS6,113,C%:CLS:UNTIL(P%AND2)=2
  671SYS "Wimp_CommandWindow",-1,-1
  710END
  720
  730DEFPROCER
  740MODE12:REPORT:PRINT" at line ";ERL
  750ENDPROC


� >3dblobs2
?� Very simple program to plot some psuedo 3d blobs onto the
1� screen and control position with the mouse.
(5� Conceived and Created by D.Northcott 06/03/1996
2A� Originally was going to have a number of objects from which
<@� to choose, however, because I wanted the program to run at
FA� an acceptable speed on ALL Acorn 32-bit machines, that idea
P>� went out the window, would have meant 2 sets of position
Z=� data, 1 for each speed type, cached & uncached, as each
d-� speed uses a different number of blobs.
n
x?� Twice the screen memory we need, useful for shadow screen
�?� use. THIS program uses 320x 256y 256c, could just as well
�� be ANY 256 colour mode.
�mode%=13
�� mode%
�� mode%+128
�
�� Error handler
�� �ER:�
��ove the cursor
��
� � "Mouse moves plot origin,"
�� " Click MIDDLE to exit,"
�
G%=�(300)

T%=�
�A%=0�10000:�
"T%=�-T%
,� T%>7 AA%=15 � AA%=30
6
@;� C%(AA%,1),X%(AA%,1),Y%(AA%,1),Z%(AA%,1),C(360),S(360)
J� A%=0 � 360
T#S(A%)=�(�(A%)):C(A%)=�(�(A%)):�
^
h
B%=0:C%=1
rș 6,112,B%:ș 6,113,C%
|ȗ � 640,512
�
S%=500
�M%=S%*2
�R%=0
�V%=7
�W%=8
�� A%=1 � AA%
�C%(A%,0)=�(62)+1
�X%(A%,0)=�(M%)-S%
�Y%(A%,0)=�(M%)-S%
�Z%(A%,0)=�(M%)-S%
��
��
�I� sorry about the non readability of the section below, speed demands
J� compact code, not easy to read code, essentially its calculating the
B� coordinates for the next frame, then sorting in the Z plane,
H� plotting the sorted blobs to the hidden screen bank, then swapping
&@� the banks, simple really, or should that be really simple.
0
:�:C=C(R%):S=S(R%):�A%=1�AA%
DoC%(A%,1)=C%(A%,0):Y%(A%,1)=Y%(A%,0):X%(A%,1)=C*X%(A%,0)-S*Z%(A%,0):Z%(A%,1)=(S*X%(A%,0)+C*Z%(A%,0)+S%)/W%:�
NR%=(R%+V%)�360:�I%=1�AA%-1
XK%=I%:�J%=I%+1�AA%
b�Z%(J%,1)<Z%(K%,1) K%=J%
l�
v[�I%<>K% ȔZ%(K%,1),Z%(I%,1):ȔY%(K%,1),Y%(I%,1):ȔX%(K%,1),X%(I%,1):ȔC%(K%,1),C%(I%,1)
��
�ȗX%,Y%,P%:�A%=1�AA%
�6�0,C%(A%,1):ȏȐX%(A%,1)+X%,Y%(A%,1)+Y%,Z%(A%,1):�
�0Ȗ:ȔB%,C%:ș6,112,B%:ș6,113,C%:�:�(P%�2)=2
�!ș "Wimp_CommandWindow",-1,-1
��
�
���ER
��12:�:�" at line ";�
��
�

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00000010  00 14 3f f4 20 56 65 72  79 20 73 69 6d 70 6c 65  |..?. Very simple|
00000020  20 70 72 6f 67 72 61 6d  20 74 6f 20 70 6c 6f 74  | program to plot|
00000030  20 73 6f 6d 65 20 70 73  75 65 64 6f 20 33 64 20  | some psuedo 3d |
00000040  62 6c 6f 62 73 20 6f 6e  74 6f 20 74 68 65 0d 00  |blobs onto the..|
00000050  1e 31 f4 20 73 63 72 65  65 6e 20 61 6e 64 20 63  |.1. screen and c|
00000060  6f 6e 74 72 6f 6c 20 70  6f 73 69 74 69 6f 6e 20  |ontrol position |
00000070  77 69 74 68 20 74 68 65  20 6d 6f 75 73 65 2e 0d  |with the mouse..|
00000080  00 28 35 f4 20 43 6f 6e  63 65 69 76 65 64 20 61  |.(5. Conceived a|
00000090  6e 64 20 43 72 65 61 74  65 64 20 62 79 20 44 2e  |nd Created by D.|
000000a0  4e 6f 72 74 68 63 6f 74  74 20 30 36 2f 30 33 2f  |Northcott 06/03/|
000000b0  31 39 39 36 0d 00 32 41  f4 20 4f 72 69 67 69 6e  |1996..2A. Origin|
000000c0  61 6c 6c 79 20 77 61 73  20 67 6f 69 6e 67 20 74  |ally was going t|
000000d0  6f 20 68 61 76 65 20 61  20 6e 75 6d 62 65 72 20  |o have a number |
000000e0  6f 66 20 6f 62 6a 65 63  74 73 20 66 72 6f 6d 20  |of objects from |
000000f0  77 68 69 63 68 0d 00 3c  40 f4 20 74 6f 20 63 68  |which..<@. to ch|
00000100  6f 6f 73 65 2c 20 68 6f  77 65 76 65 72 2c 20 62  |oose, however, b|
00000110  65 63 61 75 73 65 20 49  20 77 61 6e 74 65 64 20  |ecause I wanted |
00000120  74 68 65 20 70 72 6f 67  72 61 6d 20 74 6f 20 72  |the program to r|
00000130  75 6e 20 61 74 0d 00 46  41 f4 20 61 6e 20 61 63  |un at..FA. an ac|
00000140  63 65 70 74 61 62 6c 65  20 73 70 65 65 64 20 6f  |ceptable speed o|
00000150  6e 20 41 4c 4c 20 41 63  6f 72 6e 20 33 32 2d 62  |n ALL Acorn 32-b|
00000160  69 74 20 6d 61 63 68 69  6e 65 73 2c 20 74 68 61  |it machines, tha|
00000170  74 20 69 64 65 61 0d 00  50 3e f4 20 77 65 6e 74  |t idea..P>. went|
00000180  20 6f 75 74 20 74 68 65  20 77 69 6e 64 6f 77 2c  | out the window,|
00000190  20 77 6f 75 6c 64 20 68  61 76 65 20 6d 65 61 6e  | would have mean|
000001a0  74 20 32 20 73 65 74 73  20 6f 66 20 70 6f 73 69  |t 2 sets of posi|
000001b0  74 69 6f 6e 0d 00 5a 3d  f4 20 64 61 74 61 2c 20  |tion..Z=. data, |
000001c0  31 20 66 6f 72 20 65 61  63 68 20 73 70 65 65 64  |1 for each speed|
000001d0  20 74 79 70 65 2c 20 63  61 63 68 65 64 20 26 20  | type, cached & |
000001e0  75 6e 63 61 63 68 65 64  2c 20 61 73 20 65 61 63  |uncached, as eac|
000001f0  68 0d 00 64 2d f4 20 73  70 65 65 64 20 75 73 65  |h..d-. speed use|
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00000220  6e 04 0d 00 78 3f f4 20  54 77 69 63 65 20 74 68  |n...x?. Twice th|
00000230  65 20 73 63 72 65 65 6e  20 6d 65 6d 6f 72 79 20  |e screen memory |
00000240  77 65 20 6e 65 65 64 2c  20 75 73 65 66 75 6c 20  |we need, useful |
00000250  66 6f 72 20 73 68 61 64  6f 77 20 73 63 72 65 65  |for shadow scree|
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00000270  20 70 72 6f 67 72 61 6d  20 75 73 65 73 20 33 32  | program uses 32|
00000280  30 78 20 32 35 36 79 20  32 35 36 63 2c 20 63 6f  |0x 256y 256c, co|
00000290  75 6c 64 20 6a 75 73 74  20 61 73 20 77 65 6c 6c  |uld just as well|
000002a0  0d 00 8c 1d f4 20 62 65  20 41 4e 59 20 32 35 36  |..... be ANY 256|
000002b0  20 63 6f 6c 6f 75 72 20  6d 6f 64 65 2e 0d 00 96  | colour mode....|
000002c0  0c 6d 6f 64 65 25 3d 31  33 0d 00 a0 0b eb 20 6d  |.mode%=13..... m|
000002d0  6f 64 65 25 0d 00 aa 0f  eb 20 6d 6f 64 65 25 2b  |ode%..... mode%+|
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000002f0  6f 72 20 68 61 6e 64 6c  65 72 0d 00 c8 0c ee 85  |or handler......|
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00000310  68 65 20 63 75 72 73 6f  72 0d 00 dc 05 87 0d 00  |he cursor.......|
00000320  e6 20 f1 20 22 4d 6f 75  73 65 20 6d 6f 76 65 73  |. . "Mouse moves|
00000330  20 70 6c 6f 74 20 6f 72  69 67 69 6e 2c 22 0d 00  | plot origin,"..|
00000340  f0 1e f1 20 22 20 43 6c  69 63 6b 20 4d 49 44 44  |... " Click MIDD|
00000350  4c 45 20 74 6f 20 65 78  69 74 2c 22 0d 00 fa 0d  |LE to exit,"....|
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000004f0  f4 05 db 0d 01 fe 49 f4  20 73 6f 72 72 79 20 61  |......I. sorry a|
00000500  62 6f 75 74 20 74 68 65  20 6e 6f 6e 20 72 65 61  |bout the non rea|
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00000530  70 65 65 64 20 64 65 6d  61 6e 64 73 0d 02 08 4a  |peed demands...J|
00000540  f4 20 63 6f 6d 70 61 63  74 20 63 6f 64 65 2c 20  |. compact code, |
00000550  6e 6f 74 20 65 61 73 79  20 74 6f 20 72 65 61 64  |not easy to read|
00000560  20 63 6f 64 65 2c 20 65  73 73 65 6e 74 69 61 6c  | code, essential|
00000570  6c 79 20 69 74 73 20 63  61 6c 63 75 6c 61 74 69  |ly its calculati|
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00000590  64 69 6e 61 74 65 73 20  66 6f 72 20 74 68 65 20  |dinates for the |
000005a0  6e 65 78 74 20 66 72 61  6d 65 2c 20 74 68 65 6e  |next frame, then|
000005b0  20 73 6f 72 74 69 6e 67  20 69 6e 20 74 68 65 20  | sorting in the |
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000005d0  6f 74 74 69 6e 67 20 74  68 65 20 73 6f 72 74 65  |otting the sorte|
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000005f0  69 64 64 65 6e 20 73 63  72 65 65 6e 20 62 61 6e  |idden screen ban|
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00000820  70 5f 43 6f 6d 6d 61 6e  64 57 69 6e 64 6f 77 22  |p_CommandWindow"|
00000830  2c 2d 31 2c 2d 31 0d 02  c6 05 e0 0d 02 d0 04 0d  |,-1,-1..........|
00000840  02 da 08 dd f2 45 52 0d  02 e4 18 eb 31 32 3a f6  |.....ER.....12:.|
00000850  3a f1 22 20 61 74 20 6c  69 6e 65 20 22 3b 9e 0d  |:." at line ";..|
00000860  02 ee 05 e1 0d ff                                 |......|
00000866

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