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Commodore BASIC  |  2019-04-13  |  1021 b   |  38 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=12
  13. 13 IFX<12THENX=331
  14. 14 IFY>239THENY=40
  15. 15 IFY<40THENY=239
  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 GOSUB2:A=USR(117):IFA<>16THEN23
  24. 24 X3=X-12:Y3=Y-40:A=USR(34),X,Y,3:A=USR(32),3
  25. 25 A=USR(117):IFA<>0THEN25
  26. 26 A=USR(33),1:A=USR(33),2:A=USR(33),3:IFX1>X2THENX4=X1:X1=X2:X2=X4
  27. 27 IFX1=X2THEN37
  28. 28 RA=ABS(X2-X1)/2:XC=X1+((X2-X1)/2):YC=Y1:A=USR(33),0:X5=X2:Y5=Y1
  29. 29 FORPH=0TO21*(null)/10STEP(null)/20
  30. 30 X4=(COS(PH)*RA)+XC+.5:Y4=.5+YC-((SIN(PH)*RA)*(YC-Y3)/(XC-X1))
  31. 31 IFY4>199THENY4=199
  32. 32 IFY4<0THENY4=0
  33. 33 IFY4=Y5THEN35
  34. 34 A=USR(66),X5,Y5,X4,Y4
  35. 35 X5=X4:Y5=Y4
  36. 36 NEXT
  37. 37 A=USR(32),0:GOTO17
  38.