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s7etozar/printSpiral.js

Created December 5, 2016 17:35
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printSpiral.js
/*
Функция, выводящая числовые спирали.
Например:
1 2 3 4 5
18 19 20 21 6
17 28 29 22 7
16 27 30 23 8
15 26 25 24 9
14 13 12 11 10
Входные данные: ширина и высота спирали.
*/
printSpiral(17, 15);
printSpiral(13, 11);
printSpiral(5, 5);
printSpiral(18, 7);
function printSpiral(width, height) {
if (width > 0 && height > 0 && parseInt(width) == width && parseInt(height) == height) {
for (var spArray = [], ob, i = 1, j = 0, k = 0, n = 1, q = width * height; n <= q; i++, j++, k += 2) {
for (ob = width * j + j, m = 1; m < width - k + 1 && n <= q; ob++, m++, n++) spArray[ob] = n;
for (ob = width * (i + 1) - i, m = 1; m < height - k && n <= q; ob += width, m++, n++) spArray[ob] = n;
for (ob = width * (height - j) - i - 1, m = 1; m < width - k && n <= q; ob--, m++, n++) spArray[ob] = n;
for (ob = q - width * (j + 2) + j, m = 1; m < height - k - 1 && n <= q; ob -= width, m++, n++) spArray[ob] = n;
}
document.write('<table style=\'text-align: right\'>');
for (var ob = 0, y = 1; y <= height; y++) {
document.write('<tr>');
for (var x = 1; x <= width; ob++, x++) document.write('<td style=\'padding: 10px 0 0 13px\'>' + spArray[ob] + '</td>');
document.write('</tr>');
}
document.write('</table>');
} else return -1;
}
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