Class: RQRCode::Renderers::SVG

Inherits:
Object
  • Object
show all
Defined in:
lib/rqrcode-rails3/renderers/svg.rb

Class Method Summary collapse

Class Method Details

.render(qrcode, options = {}) ⇒ Object

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)



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# File 'lib/rqrcode-rails3/renderers/svg.rb', line 12

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.is_dark(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