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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 2.iso
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STUTTGART
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FROMUTS
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ARCAUT
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Automatons
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Brown
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1991-07-27
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38 lines
AUTOMATON*
Brown'n_Motion
'Brownian Motion' makes use of the Margolus neighbourhood RNDB function.
This returns a random value for each 2x2 block of cells in the CA universe.
In this automaton the number is used to select a way of jumbling up the
cells in each block; thus the total number of cells of each state is
preserved, & each cell appears to take a random walk in the grid. It starts
from four ordered, differently coloured circles on a black background.
Notice how the various colours diffuse into each other, eventually becoming
uniformly distributed. Compare with 'GeneticDrift'.
INITIALISATION*
10DEF PROCdo
20*SetEval wrap on
30*SetEval neig margolus
40*SetEval rndb -1
50ENDPROC
SCREEN*
10DEF PROCdo
20DIM buf% 256:SYS "OS_ReadVarVal","sux",buf%,256
30a%=!buf%:r%=.8*a%
40GCOL 63:CIRCLE FILL a%,a%,r%
50GCOL 48:CIRCLE FILL -a%,a%,r%
60GCOL 12:CIRCLE FILL a%,-a%,r%
70GCOL 3:CIRCLE FILL -a%,-a%,r%
80ENDPROC
CODE*
( READ_NEIG
2RNDB IF (CW ==) CCW == )
END*