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23 lines
693 B
QBasic
23 lines
693 B
QBasic
10 REM TWISTER-DEMO
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15 REM https://8bitshack.org/post/twister/
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20 HGR
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30 FOR A2 = 1 TO 360 STEP 3
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40 AM = 120+COS(A2*0.0174533)*100
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50 AN = -3.141593+SIN(A2*0.0174533)*3.141593
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60 FOR Y = 1 TO 159 STEP 2
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65 FV = Y/AM+AN
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70 X1 = 35*SIN(FV)
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80 X2 = 35*SIN(FV+1.570796)
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90 REM X3 = 140+35*SIN(FV+3.141593)
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95 X3 = -X1
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100 REM X4 = 140+35*SIN(FV+4.712389)
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105 X4 = -X2
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108 HCOLOR = 0: HPLOT 105,Y TO 175,Y
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110 IF X1 < X2 THEN HCOLOR = 1: HPLOT 140+X1,Y TO 140+X2,Y: GOTO 130
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120 IF X3 < X4 THEN HCOLOR = 1: HPLOT 140+X3,Y TO 140+X4,Y
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130 IF X2 < X3 THEN HCOLOR = 2: HPLOT 140+X2,Y TO 140+X3,Y: GOTO 150
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140 IF X4 < X1 THEN HCOLOR = 2: HPLOT 140+X4,Y TO 140+X1,Y
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150 NEXT Y
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160 NEXT A2
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170 GOTO 30
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