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22 lines
570 B
QBasic
22 lines
570 B
QBasic
10 REM TWISTER-DEMO
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15 REM https://8bitshack.org/post/twister/
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20 GR
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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 39 STEP 2
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65 FV = Y*4/AM+AN
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70 X1 = 8*SIN(FV)
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80 X2 = 8*SIN(FV+1.570796)
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95 X3 = -X1
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105 X4 = -X2
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108 COLOR = 0: HLIN 10,30 AT Y
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109 COLOR = 1
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110 IF X1 < X2 THEN HLIN 20+X1,20+X2 AT Y: GOTO 130
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120 IF X3 < X4 THEN HLIN 20+X3,20+X4 AT Y
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130 COLOR = 2 : IF X2 < X3 THEN HLIN 20+X2,20+X3 AT Y: GOTO 150
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140 IF X4 < X1 THEN HLIN 20+X4,20+X1 AT 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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