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| require 'text-table' | |
| class SpiralMatrix | |
| DIRECTIONS = [ | |
| { x: 1, y: 0 }, | |
| { x: 0, y: 1 }, | |
| { x: -1, y: 0 }, | |
| { x: 0, y: -1 } | |
| ] | |
| def initialize(n) | |
| @n = n.to_i | |
| @a = [] | |
| @n.times { @a << Array.new(@n) } | |
| fill | |
| end | |
| def to_s | |
| table = Text::Table.new | |
| @a.each_with_index do |o, i| | |
| table.rows << :separator if i > 0 && i < @n | |
| table.rows << o | |
| end | |
| table.to_s | |
| end | |
| def to_a | |
| @a | |
| end | |
| private | |
| def fill | |
| x = -1 | |
| y = 0 | |
| i = 1 | |
| while i <= @n * @n | |
| DIRECTIONS.each do |v| | |
| dx = x + v[:x] | |
| dy = y + v[:y] | |
| while dx < @n && dy < @n && @a[dy][dx].nil? | |
| x += v[:x] | |
| y += v[:y] | |
| @a[y][x] = i | |
| i += 1 | |
| dx = x + v[:x] | |
| dy = y + v[:y] | |
| end | |
| end | |
| end | |
| end | |
| end | |
| puts SpiralMatrix.new(ARGV[0] || gets) |
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