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32 lines
718 B
QBasic
32 lines
718 B
QBasic
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100 REM MANDELBROT GFX - BASIC VERSION FOR COMMANDERX16
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110 REM MANDELBROT COORDINATES
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120 XL=-2.000:XU=0.500
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130 YL=-1.100:YU=1.100
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140 MI%=16 :REM MAXIMUM ITERATIONS
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150 WI%=256:HI%=200 :REM SCREEN DIMENSIONS
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160 DX=(XU-XL)/WI%
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170 DY=(YU-YL)/HI%
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200 SCREEN $80:TI$="000000"
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500 REM MAIN LOOP
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520 X0=0:Y0=0:GOSUB2000
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530 FOR YY=0 TO HI%-1
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540 Y0=YL+DY*YY
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610 FOR XX=0 TO WI%-1
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620 X0=XL+DX*XX
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700 REM CALCULATE MANDELBROT
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710 X=0:Y=0:IT%=0
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720 X2=0:Y2=0
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730 XY=X*Y
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740 X=X2-Y2+X0
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750 Y=2*XY+Y0
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760 IT%=IT%+1
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770 X2=X*X:Y2=Y*Y
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780 IF (X2+Y2 <= 4) AND (IT% < MI%) THEN GOTO 730
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790 PSET XX,YY,MI%-IT%
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800 NEXT XX
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810 GOSUB2000
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820 NEXT YY
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1000 GOTO 1000
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2000 REM OUTPUT TIME SPENT
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2010 PRINT CHR$(19)SPC(33)TI$:RETURN
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