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https://github.com/mbirth/gwbasic.git
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49 lines
1.2 KiB
QBasic
49 lines
1.2 KiB
QBasic
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10 'Programm: SONNE.BAS
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20 'Funktion: Simulation der Planeten-
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30 ' gravitation
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40 'Sprache: GW-Basic
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50 'Autor: Axel Werner
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60 '(C)1991 DMV Widuch GmbH & Co. KG
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70 DEFINT I,S,A,F
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80 INPUT "A: ",A
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90 IF A>5 THEN A=5
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100 IF A<1 THEN A=1
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110 FOR I=1 TO A
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120 PRINT"XP("I"),YP("I"),ZP("I"): ";
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130 INPUT"",XP(I),YP(I),ZP(I)
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140 PRINT"DXP("I"),DYP("I"),DZP("I"): ";
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150 INPUT"",DXP(I),DYP(I),DZP(I)
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160 PRINT"M("I"): ";:INPUT"",M(I)
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170 NEXT
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180 INPUT"MS: ",M(0)
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190 XP(0)=0:YP(0)=0:ZP(0)=0
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200 SCREEN 2:CLS:KEY OFF
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210 WINDOW SCREEN(-320,-250)-(320,250)
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220 G=.006672
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230 FOR I=0 TO A
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240 NXP=XP(I)+DXP(I):NYP=YP(I)+DYP(I)
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250 NZP=ZP(I)+DZP(I)
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260 FOR S=0 TO A
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270 IF I=S THEN 350
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280 X2=XP(S)-XP(I):Y2=YP(S)-YP(I)
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290 Z2=ZP(S)-ZP(I)
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300 D=SQR(X2*X2+Y2*Y2+Z2*Z2)
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310 GK=G*M(S)*M(I)/(D*D)
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320 B=GK/(2*M(I))
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330 X1=X2*B/D:Y1=Y2*B/D:Z1=Z2*B/D
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340 NXP=NXP+X1:NYP=NYP+Y1:NZP=NZP+Z1
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350 NEXT
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360 DXP(I)=NXP-XP(I):DYP(I)=NYP-YP(I)
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370 DZP(I)=NZP-ZP(I):GOTO 400
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380 X%=XP(I):Y%=YP(I):Z%=ZP(I)
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390 F=0:GOSUB 450
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400 X%=NXP:Y%=NYP:Z%=NZP:F=1:GOSUB 450
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410 XP(I)=NXP:YP(I)=NYP:ZP(I)=NZP
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420 NEXT
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430 IF INKEY$="" THEN 230
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440 END
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450 X%=X%+Z%/3
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460 Y%=Y%-Z%/3
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470 PSET(X%,Y%),F
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480 RETURN
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