StarInfo/Adcock/Scallops

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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 1997-04 A.adf » Features1
Filename:	StarInfo/Adcock/Scallops
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File size:	04E9 bytes
Load address:	0000
Exec address:	0000

File contents

   10REM Scallops
   20REM By Mark Adcock
   30REM 19/11/96
   40REM
   50MODE 15
   60ON ERROR PRINTERL:REPORT:END
   70SYS "ColourTrans_SetGCOL",(64<<8)+(64<<16)+(255<<24)
   80CIRCLEFILL 640,512,820
   90DIM XR(10),YR(10)
  100REPEAT
  110PROCDRAWSCALLOP
  120UNTIL FALSE
  130END
  140:
  150:
  160:
  170DEF PROCDRAWSCALLOP
  180ER=RND(128)+128
  190EG=RND(128)+128
  200EB=RND(128)+128
  210X=RND(1280)
  220Y=RND(1024)
  230S=RND(200)
  240XR=S
  250YR=0
  260PROCROT(XR,YR,RND(360))
  270XR=NX
  280YR=NY
  290N=RND(5)+5
  300SPREAD=RND((270/N)-5)+5
  310FOR L=1 TO N
  320XR(L)=XR
  330YR(L)=YR
  340PROCROT(XR,YR,SPREAD)
  350XR=NX
  360YR=NY
  370NEXT L
  380:
  390CN=128
  400RP=(ER-64)/CN
  410GP=(EG-64)/CN
  420BP=(EB-255)/CN
  430FOR C = 1 TO CN STEP 5
  440SYS "ColourTrans_SetGCOL",((64+RP*(C-1))<<8)+((64+GP*(C-1))<<16)+((255+BP*(C-1))<<24),,,&333
  450FOR L = 1 TO N
  460PROCLINE(X-XR(L)/3,Y-YR(L)/3,X+XR(L),Y+YR(L),0.5*((CN-C)/CN)*(2*S*PI)/N)
  470NEXTL
  480NEXT C
  490ENDPROC
  500:
  510:
  520:
  530DEF PROCROT(TX,TY,TR)
  540TR=RAD(TR)
  550NX=TX*COS(TR)-TY*SIN(TR)
  560NY=TX*SIN(TR)+TY*COS(TR)
  570ENDPROC
  580:
  590:
  600:
  610DEF PROCLINE(OLX,OLY,LX,LY,SIZE)
  620LOCAL LXP,LYP,C,SX,SY,A,L
  630IF LX=OLX LX+=1
  640IF ABS(LX-OLX)>ABS(LY-OLY) THEN
  650 L=ABS(LX-OLX)
  660 LXP=(LX-OLX)/L:LYP=(LY-OLY)/ABS(LX-OLX)
  670ENDIF
  680IF ABS(LY-OLY)>ABS(LX-OLX) THEN
  690 L=ABS(LY-OLY)
  700 LYP=(LY-OLY)/L:LXP=(LX-OLX)/ABS(LY-OLY)
  710ENDIF
  720SX=OLX
  730SY=OLY
  740FOR A = 1 TO L/6
  750SX+=LXP*6
  760SY+=LYP*6
  770CIRCLEFILL SX,SY,SIZE
  780NEXT A
  790ENDPROC
  800


� Scallops
� By Mark Adcock
� 19/11/96
(�
2� 15
<� � �:�:�
F7ș "ColourTrans_SetGCOL",(64<<8)+(64<<16)+(255<<24)
PȏȐ 640,512,820
Z� XR(10),YR(10)
d�
n�DRAWSCALLOP
x� �
��
�:
�:
�:
�� �DRAWSCALLOP
�ER=�(128)+128
�EG=�(128)+128
�EB=�(128)+128
�
X=�(1280)
�
Y=�(1024)
�S=�(200)
�XR=S
�YR=0
�ROT(XR,YR,�(360))
	XR=NX
	YR=NY
"N=�(5)+5
,SPREAD=�((270/N)-5)+5
6
� L=1 � N
@XR(L)=XR
JYR(L)=YR
T�ROT(XR,YR,SPREAD)
^	XR=NX
h	YR=NY
r� L
|:
�
CN=128
�RP=(ER-64)/CN
�GP=(EG-64)/CN
�BP=(EB-255)/CN
�� C = 1 � CN � 5
�_ș "ColourTrans_SetGCOL",((64+RP*(C-1))<<8)+((64+GP*(C-1))<<16)+((255+BP*(C-1))<<24),,,&333
�� L = 1 � N
�H�LINE(X-XR(L)/3,Y-YR(L)/3,X+XR(L),Y+YR(L),0.5*((CN-C)/CN)*(2*S*�)/N)
��L
�� C
��
�:
�:
:
� �ROT(TX,TY,TR)
TR=�(TR)
&NX=TX*�(TR)-TY*�(TR)
0NY=TX*�(TR)+TY*�(TR)
:�
D:
N:
X:
b� �LINE(OLX,OLY,LX,LY,SIZE)
l� LXP,LYP,C,SX,SY,A,L
v� LX=OLX LX+=1
�� �(LX-OLX)>�(LY-OLY) �
� L=�(LX-OLX)
�* LXP=(LX-OLX)/L:LYP=(LY-OLY)/�(LX-OLX)
��
�� �(LY-OLY)>�(LX-OLX) �
� L=�(LY-OLY)
�* LYP=(LY-OLY)/L:LXP=(LX-OLX)/�(LY-OLY)
��
�
SX=OLX
�
SY=OLY
�� A = 1 � L/6
�
SX+=LXP*6
�
SY+=LYP*6
ȏȐ SX,SY,SIZE
� A
�
 
�

00000000  0d 00 0a 0e f4 20 53 63  61 6c 6c 6f 70 73 0d 00  |..... Scallops..|
00000010  14 14 f4 20 42 79 20 4d  61 72 6b 20 41 64 63 6f  |... By Mark Adco|
00000020  63 6b 0d 00 1e 0e f4 20  31 39 2f 31 31 2f 39 36  |ck..... 19/11/96|
00000030  0d 00 28 05 f4 0d 00 32  08 eb 20 31 35 0d 00 3c  |..(....2.. 15..<|
00000040  0e ee 20 85 20 f1 9e 3a  f6 3a e0 0d 00 46 37 c8  |.. . ..:.:...F7.|
00000050  99 20 22 43 6f 6c 6f 75  72 54 72 61 6e 73 5f 53  |. "ColourTrans_S|
00000060  65 74 47 43 4f 4c 22 2c  28 36 34 3c 3c 38 29 2b  |etGCOL",(64<<8)+|
00000070  28 36 34 3c 3c 31 36 29  2b 28 32 35 35 3c 3c 32  |(64<<16)+(255<<2|
00000080  34 29 0d 00 50 14 c8 8f  c8 90 20 36 34 30 2c 35  |4)..P..... 640,5|
00000090  31 32 2c 38 32 30 0d 00  5a 13 de 20 58 52 28 31  |12,820..Z.. XR(1|
000000a0  30 29 2c 59 52 28 31 30  29 0d 00 64 05 f5 0d 00  |0),YR(10)..d....|
000000b0  6e 10 f2 44 52 41 57 53  43 41 4c 4c 4f 50 0d 00  |n..DRAWSCALLOP..|
000000c0  78 07 fd 20 a3 0d 00 82  05 e0 0d 00 8c 05 3a 0d  |x.. ..........:.|
000000d0  00 96 05 3a 0d 00 a0 05  3a 0d 00 aa 12 dd 20 f2  |...:....:..... .|
000000e0  44 52 41 57 53 43 41 4c  4c 4f 50 0d 00 b4 11 45  |DRAWSCALLOP....E|
000000f0  52 3d b3 28 31 32 38 29  2b 31 32 38 0d 00 be 11  |R=.(128)+128....|
00000100  45 47 3d b3 28 31 32 38  29 2b 31 32 38 0d 00 c8  |EG=.(128)+128...|
00000110  11 45 42 3d b3 28 31 32  38 29 2b 31 32 38 0d 00  |.EB=.(128)+128..|
00000120  d2 0d 58 3d b3 28 31 32  38 30 29 0d 00 dc 0d 59  |..X=.(1280)....Y|
00000130  3d b3 28 31 30 32 34 29  0d 00 e6 0c 53 3d b3 28  |=.(1024)....S=.(|
00000140  32 30 30 29 0d 00 f0 08  58 52 3d 53 0d 00 fa 08  |200)....XR=S....|
00000150  59 52 3d 30 0d 01 04 16  f2 52 4f 54 28 58 52 2c  |YR=0.....ROT(XR,|
00000160  59 52 2c b3 28 33 36 30  29 29 0d 01 0e 09 58 52  |YR,.(360))....XR|
00000170  3d 4e 58 0d 01 18 09 59  52 3d 4e 59 0d 01 22 0c  |=NX....YR=NY..".|
00000180  4e 3d b3 28 35 29 2b 35  0d 01 2c 19 53 50 52 45  |N=.(5)+5..,.SPRE|
00000190  41 44 3d b3 28 28 32 37  30 2f 4e 29 2d 35 29 2b  |AD=.((270/N)-5)+|
000001a0  35 0d 01 36 0d e3 20 4c  3d 31 20 b8 20 4e 0d 01  |5..6.. L=1 . N..|
000001b0  40 0c 58 52 28 4c 29 3d  58 52 0d 01 4a 0c 59 52  |@.XR(L)=XR..J.YR|
000001c0  28 4c 29 3d 59 52 0d 01  54 16 f2 52 4f 54 28 58  |(L)=YR..T..ROT(X|
000001d0  52 2c 59 52 2c 53 50 52  45 41 44 29 0d 01 5e 09  |R,YR,SPREAD)..^.|
000001e0  58 52 3d 4e 58 0d 01 68  09 59 52 3d 4e 59 0d 01  |XR=NX..h.YR=NY..|
000001f0  72 07 ed 20 4c 0d 01 7c  05 3a 0d 01 86 0a 43 4e  |r.. L..|.:....CN|
00000200  3d 31 32 38 0d 01 90 11  52 50 3d 28 45 52 2d 36  |=128....RP=(ER-6|
00000210  34 29 2f 43 4e 0d 01 9a  11 47 50 3d 28 45 47 2d  |4)/CN....GP=(EG-|
00000220  36 34 29 2f 43 4e 0d 01  a4 12 42 50 3d 28 45 42  |64)/CN....BP=(EB|
00000230  2d 32 35 35 29 2f 43 4e  0d 01 ae 14 e3 20 43 20  |-255)/CN..... C |
00000240  3d 20 31 20 b8 20 43 4e  20 88 20 35 0d 01 b8 5f  |= 1 . CN . 5..._|
00000250  c8 99 20 22 43 6f 6c 6f  75 72 54 72 61 6e 73 5f  |.. "ColourTrans_|
00000260  53 65 74 47 43 4f 4c 22  2c 28 28 36 34 2b 52 50  |SetGCOL",((64+RP|
00000270  2a 28 43 2d 31 29 29 3c  3c 38 29 2b 28 28 36 34  |*(C-1))<<8)+((64|
00000280  2b 47 50 2a 28 43 2d 31  29 29 3c 3c 31 36 29 2b  |+GP*(C-1))<<16)+|
00000290  28 28 32 35 35 2b 42 50  2a 28 43 2d 31 29 29 3c  |((255+BP*(C-1))<|
000002a0  3c 32 34 29 2c 2c 2c 26  33 33 33 0d 01 c2 0f e3  |<24),,,&333.....|
000002b0  20 4c 20 3d 20 31 20 b8  20 4e 0d 01 cc 48 f2 4c  | L = 1 . N...H.L|
000002c0  49 4e 45 28 58 2d 58 52  28 4c 29 2f 33 2c 59 2d  |INE(X-XR(L)/3,Y-|
000002d0  59 52 28 4c 29 2f 33 2c  58 2b 58 52 28 4c 29 2c  |YR(L)/3,X+XR(L),|
000002e0  59 2b 59 52 28 4c 29 2c  30 2e 35 2a 28 28 43 4e  |Y+YR(L),0.5*((CN|
000002f0  2d 43 29 2f 43 4e 29 2a  28 32 2a 53 2a af 29 2f  |-C)/CN)*(2*S*.)/|
00000300  4e 29 0d 01 d6 06 ed 4c  0d 01 e0 07 ed 20 43 0d  |N).....L..... C.|
00000310  01 ea 05 e1 0d 01 f4 05  3a 0d 01 fe 05 3a 0d 02  |........:....:..|
00000320  08 05 3a 0d 02 12 14 dd  20 f2 52 4f 54 28 54 58  |..:..... .ROT(TX|
00000330  2c 54 59 2c 54 52 29 0d  02 1c 0c 54 52 3d b2 28  |,TY,TR)....TR=.(|
00000340  54 52 29 0d 02 26 18 4e  58 3d 54 58 2a 9b 28 54  |TR)..&.NX=TX*.(T|
00000350  52 29 2d 54 59 2a b5 28  54 52 29 0d 02 30 18 4e  |R)-TY*.(TR)..0.N|
00000360  59 3d 54 58 2a b5 28 54  52 29 2b 54 59 2a 9b 28  |Y=TX*.(TR)+TY*.(|
00000370  54 52 29 0d 02 3a 05 e1  0d 02 44 05 3a 0d 02 4e  |TR)..:....D.:..N|
00000380  05 3a 0d 02 58 05 3a 0d  02 62 1f dd 20 f2 4c 49  |.:..X.:..b.. .LI|
00000390  4e 45 28 4f 4c 58 2c 4f  4c 59 2c 4c 58 2c 4c 59  |NE(OLX,OLY,LX,LY|
000003a0  2c 53 49 5a 45 29 0d 02  6c 19 ea 20 4c 58 50 2c  |,SIZE)..l.. LXP,|
000003b0  4c 59 50 2c 43 2c 53 58  2c 53 59 2c 41 2c 4c 0d  |LYP,C,SX,SY,A,L.|
000003c0  02 76 12 e7 20 4c 58 3d  4f 4c 58 20 4c 58 2b 3d  |.v.. LX=OLX LX+=|
000003d0  31 0d 02 80 1b e7 20 94  28 4c 58 2d 4f 4c 58 29  |1..... .(LX-OLX)|
000003e0  3e 94 28 4c 59 2d 4f 4c  59 29 20 8c 0d 02 8a 10  |>.(LY-OLY) .....|
000003f0  20 4c 3d 94 28 4c 58 2d  4f 4c 58 29 0d 02 94 2a  | L=.(LX-OLX)...*|
00000400  20 4c 58 50 3d 28 4c 58  2d 4f 4c 58 29 2f 4c 3a  | LXP=(LX-OLX)/L:|
00000410  4c 59 50 3d 28 4c 59 2d  4f 4c 59 29 2f 94 28 4c  |LYP=(LY-OLY)/.(L|
00000420  58 2d 4f 4c 58 29 0d 02  9e 05 cd 0d 02 a8 1b e7  |X-OLX)..........|
00000430  20 94 28 4c 59 2d 4f 4c  59 29 3e 94 28 4c 58 2d  | .(LY-OLY)>.(LX-|
00000440  4f 4c 58 29 20 8c 0d 02  b2 10 20 4c 3d 94 28 4c  |OLX) ..... L=.(L|
00000450  59 2d 4f 4c 59 29 0d 02  bc 2a 20 4c 59 50 3d 28  |Y-OLY)...* LYP=(|
00000460  4c 59 2d 4f 4c 59 29 2f  4c 3a 4c 58 50 3d 28 4c  |LY-OLY)/L:LXP=(L|
00000470  58 2d 4f 4c 58 29 2f 94  28 4c 59 2d 4f 4c 59 29  |X-OLX)/.(LY-OLY)|
00000480  0d 02 c6 05 cd 0d 02 d0  0a 53 58 3d 4f 4c 58 0d  |.........SX=OLX.|
00000490  02 da 0a 53 59 3d 4f 4c  59 0d 02 e4 11 e3 20 41  |...SY=OLY..... A|
000004a0  20 3d 20 31 20 b8 20 4c  2f 36 0d 02 ee 0d 53 58  | = 1 . L/6....SX|
000004b0  2b 3d 4c 58 50 2a 36 0d  02 f8 0d 53 59 2b 3d 4c  |+=LXP*6....SY+=L|
000004c0  59 50 2a 36 0d 03 02 13  c8 8f c8 90 20 53 58 2c  |YP*6........ SX,|
000004d0  53 59 2c 53 49 5a 45 0d  03 0c 07 ed 20 41 0d 03  |SY,SIZE..... A..|
000004e0  16 05 e1 0d 03 20 04 0d  ff                       |..... ...|
000004e9

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