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Commodore BASIC  |  1988-11-13  |  1KB  |  37 lines
  1. 1 A=USR(32),0:CM=0:GOTO17
  2. 2 GETA$:IFA$=""THEN11
  3. 3 IFA$>"/"ANDA$<":"THENSF=VAL(A$)-SS*(A$="0"):GOTO11
  4. 4 IFA$="[147]"THENSYS36888:GOTO11
  5. 5 IFA$="!"THENSYS36867:GOTO11
  6. 6 IFA$="="THENSYS36882:GOTO11
  7. 7 IFA$="&"THENSYS36879:GOTO11
  8. 8 IFA$=""THENSYS36885:GOTO11
  9. 9 IFA$="+"THENCM=1+(CM=1):GOTO11
  10. 10 A=USR(33),0:LOAD"CMND",D0
  11. 11 X=X+USR(121)*SF:Y=Y-USR(122)*SF
  12. 12 IFX>331THENX=331
  13. 13 IFX<12THENX=12
  14. 14 IFY>239THENY=239
  15. 15 IFY<40THENY=40
  16. 16 A=USR(34),X,Y,0:A=USR(34),16,Y,6:A=USR(34),X,231,7:RETURN
  17. 17 GOSUB2:A=USR(117):IFA<>16THEN17
  18. 18 SYS36864:X1=X-12:Y1=Y-40:A=USR(34),X,Y,1:A=USR(32),1
  19. 19 A=USR(117):IFA<>0THEN19
  20. 20 GOSUB2:A=USR(117):IFA<>16THEN20
  21. 21 X2=X-12:Y2=Y-40:A=USR(34),X,Y,2:A=USR(32),2
  22. 22 A=USR(117):IFA<>0THEN22
  23. 23 A=USR(33),1:A=USR(33),2:IFX1=X2THENIFY1=Y2THEN36
  24. 24 RA=(SQR((X1-X2)^2+(Y1-Y2)^2))/2:XC=X1-(X1-X2)/2:YC=Y1-(Y1-Y2)/2
  25. 25 A=USR(33),0:X4=XC+RA:Y4=YC
  26. 26 IFCM=1THENFORC=-1TO+1:A=USR(64),XC+C,YC:A=USR(64),XC,YC+C:NEXT
  27. 27 FORPH=0TO21*(null)/10STEP(null)/20
  28. 28 X3=(COS(PH)*RA)+XC+.5:Y3=(SIN(PH)*.83*RA)+YC+.5
  29. 29 IF(X3>320)OR(X3<0)THEN34
  30. 30 IF(Y3>200)OR(Y3<0)THEN34
  31. 31 IF(X4>320)OR(X4<0)THENX4=X3:Y4=Y3
  32. 32 IF(Y4>200)OR(Y4<0)THENX4=X3:Y4=Y3
  33. 33 A=USR(66),X3,Y3,X4,Y4
  34. 34 X4=X3:Y4=Y3
  35. 35 NEXT
  36. 36 A=USR(32),0:GOTO17
  37.