69 lines
1.4 KiB
Ruby
69 lines
1.4 KiB
Ruby
require 'victor'
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def sum_digits(n)
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while n > 9
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n = n.to_s.chars.map(&:to_i).sum
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end
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n
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end
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def step(x, y, n, dir)
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case dir
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when :top
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return [x,y+n,:right]
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when :right
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return [x+n,y,:bottom]
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when :bottom
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return [x,y-n,:left]
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when :left
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return [x-n,y,:top]
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end
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end
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def run_number(number)
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counter = 1
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x, y, dir = 0, 0, :top
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line_stack = [[0,0]]
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loop do
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x, y, dir = step(x,y, sum_digits(counter*number), dir)
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line_stack << [x,y]
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counter += 1
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break if x == 0 && y == 0
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end
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return make_svg(line_stack)
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end
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def make_svg(line_stack)
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line_length = 20
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xs = line_stack.map { |c| c[0] }
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ys = line_stack.map { |c| c[1] }
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x_offset = -xs.min
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y_offset = -ys.min
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svg_coords = ->(p) {
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nx, ny = p
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[(nx+x_offset)*line_length + line_length/2, (ny+y_offset)*line_length + line_length/2]
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}
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max_width = (xs.max - xs.min).abs * line_length + line_length
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max_height = (ys.max - ys.min).abs * line_length + line_length
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svg = Victor::SVG.new width: max_width, height: max_height
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style = { stroke: 'black', stroke_width: 5 }
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svg.build do
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line_stack.each_cons(2) do |pair|
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p1, p2 = pair
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x1, y1 = svg_coords.call(p1)
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x2, y2 = svg_coords.call(p2)
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line x1: x1, y1: y1, x2: x2, y2: y2, style: style
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circle cx: x2, cy: y2, r: line_length/6, style: style, fill: 'black'
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end
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end
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return svg
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end
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(1..9).each do |i|
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run_number(i).save "pattern_#{i}"
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end
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