Contents

# frozen_string_literal: false

# Core SVG data for the US Ensign.
#
# This class should never need to be called directly.
# @private
class USPSFlags::Core::US
  def svg
    @base_hoist = 2000.to_f
    @base_fly = @base_hoist * 1.91

    @canton_hoist = @base_hoist * 7 / 13
    @canton_fly = @canton_hoist * Math.sqrt(2)

    @star_offset = 20 # Half of scaled star height

    svg = defs
    svg << stripes
    svg << stars

    # star_diameter = base_hoist*4/5/13
    # svg << <<~SVG
    #   <circle cx="#{@canton_fly*6/12}" cy="#{@canton_hoist*4/10-5}" r="#{star_diameter/2}" fill="#999999" fill-opacity="0.4" />
    # SVG

    svg
  end

private

  def defs
    File.read("#{File.dirname(__dir__)}/core/us_defs.svg.partial").gsub('STAR', USPSFlags::Core.star)
  end

  def stars
    rows = {
      odd: (1..9).step(2).to_a,
      even: (2..8).step(2).to_a
    }
    columns = {
      odd: (1..11).step(2).to_a,
      even: (2..10).step(2).to_a
    }

    svg = ''
    %i[odd even].each do |type|
      rows[type].each do |r|
        columns[type].each do |c|
          svg << <<~SVG
            <g transform="translate(#{@canton_fly * c / 12}, #{@star_offset + @canton_hoist * r / 10})"><g><use href="#star" /></g></g>
          SVG
        end
      end
    end
    svg
  end

  def stripes
    s = (0..12).map do |i|
      color = i.even? ? 'red' : 'white'
      "<use href=\"##{color}-stripe\" y=\"#{@base_hoist * i / 13}\" />"
    end

    s.join("\n") + "\n<rect y=\"0\" width=\"#{@canton_fly}\" height=\"#{@canton_hoist}\" fill=\"#{USPSFlags::Config::OLD_GLORY_BLUE}\" />\n"
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
usps_flags-0.4.1	lib/usps_flags/core/us.rb
usps_flags-0.4.0	lib/usps_flags/core/us.rb