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35 lines
820 B
35 lines
820 B
/*
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* Output a 1024x1024 image generated using Math.random().
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*/
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function test(filename, threshold) {
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var i, j, t;
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var res = [];
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res.push('P2\n1024 1024\n255\n');
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for (i = 0; i < 1024; i++) {
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for (j = 0; j < 1024; j++) {
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t = Math.random();
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if (typeof threshold === 'number') {
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res.push(t >= threshold ? '255 ' : '0 ');
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} else {
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res.push(String(Math.floor(t * 256.0)) + ' ');
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}
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}
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res.push('\n');
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}
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res = res.join('');
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writeFile(filename, res);
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print('Wrote', filename);
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}
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try {
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test('rnd-threshold-01.pgm', 0.1);
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test('rnd-threshold-05.pgm', 0.5);
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test('rnd-threshold-09.pgm', 0.9);
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test('rnd-threshold-none.pgm', null);
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} catch (e) {
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print(e.stack || e);
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}
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