40 lines
850 B
Plaintext
40 lines
850 B
Plaintext
var blob = use('blob')
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var iter = 50, limit = 2.0;
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var zr, zi, cr, ci, tr, ti;
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var h = Number(arg[0]) || 500
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var w = h
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log.console(`P4\n${w} ${h}`);
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for (let y = 0; y < h; ++y) {
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// Create a blob for the row - we need w bits
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var row = new blob(w);
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for (let x = 0; x < w; ++x) {
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zr = zi = tr = ti = 0;
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cr = 2 * x / w - 1.5;
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ci = 2 * y / h - 1;
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for (let i = 0; i < iter && (tr + ti <= limit * limit); ++i) {
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zi = 2 * zr * zi + ci;
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zr = tr - ti + cr;
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tr = zr * zr;
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ti = zi * zi;
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}
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// Write a 1 bit if inside the set, 0 if outside
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if (tr + ti <= limit * limit)
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row.write_bit(1);
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else
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row.write_bit(0);
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}
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// Convert the blob to stone (immutable) to prepare for output
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stone(row)
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// Output the blob data as raw bytes
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log.console(text(row, 'b'));
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}
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$_.stop() |