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26 lines
594 B
Plaintext
26 lines
594 B
Plaintext
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10 REM Boy's Surface
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20 REM From the book "Topologicon" by Jean-Pierre Petit
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100 PI=3.141592:P3=PI/3:P6=PI/6:P8=PI/8
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110 HGR : POKE 49234,0
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120 HCOLOR=3
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130 FOR MU = 0 TO PI STEP 0.1
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140 D=34+4.79*SIN(6*MU-P)
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150 E=6.73*SIN(3*MU-P6)
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160 A=D+E
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170 B=D-E
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180 AL=(P8)*SIN(3*MU)
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190 C1=A*A-B*B
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200 C2=SQR(A*A+B*B)
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210 CM=COS(MU)
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220 SM=SIN(MU)
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230 FOR TE=0 TO 6.282 STEP .03
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240 X1=C1/C2+A*COS(TE)-B*SIN(TE)
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250 Z1=C2+A*COS(TE)+B*SIN(TE)
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260 REM KOORDINATEN
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270 X=X1*CM-Z1*SIN(AL)*SM
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280 Y=X1*SM+Z1*SIN(AL)*SM
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300 REM ZEICHNUNG
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310 HPLOT 140+X,96+Y
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320 NEXT TE
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330 NEXT MU
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