Julia Set
Details
In a 500x500px canvas, draw the Julia for f(z) = z^2 + c, where c = -0.4 + 0.6i. Output the image in ppm grayscale format.
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Top-level programs are supported, args holds ARGV.
ARGV is available via STDIN, joined on NULL. x is a no-op.
arguments holds ARGV, print() to output with a newline,
write() to output without a newline.
say() is available without any import.
SELECT arg FROM argv to access the arguments, only the first
column of the first result set will be printed, NULL values will be
skipped, and the dialect is SQLite.
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