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module RQRCode
module Renderers
class SVG
class << self
# Render the SVG from the qrcode string provided from the RQRCode gem
# Options:
# offset - Padding around the QR Code (e.g. 10)
# unit - How many pixels per module (Default: 11)
# fill - Background color (e.g "ffffff" or :white)
# color - Foreground color for the code (e.g. "000000" or :black)
def render(qrcode, options={})
offset = options[:offset].to_i || 0
color = options[:color] || "000"
unit = options[:unit] || 11
# height and width dependent on offset and QR complexity
dimension = (qrcode.module_count*unit) + (2*offset)
xml_tag = %{<?xml version="1.0" standalone="yes"?>}
open_tag = %{<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events" width="#{dimension}" height="#{dimension}">}
close_tag = "</svg>"
result = []
qrcode.modules.each_index do |c|
tmp = []
qrcode.modules.each_index do |r|
y = c*unit + offset
x = r*unit + offset
next unless qrcode.checked?(c, r)
tmp << %{<rect width="#{unit}" height="#{unit}" x="#{x}" y="#{y}" style="fill:##{color}"/>}
end
result << tmp.join
end
if options[:fill]
result.unshift %{<rect width="#{dimension}" height="#{dimension}" x="0" y="0" style="fill:##{options[:fill]}"/>}
end
svg = [xml_tag, open_tag, result, close_tag].flatten.join("\n")
end
end
end
end
end
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