cairo_outputter.rb in barby-0.2.0

- old
+ new

@@ -1,9 +1,14 @@
+require 'barby/outputter'
 require 'cairo'
 require 'stringio'
 
 module Barby
+
+  #Uses Cairo to render a barcode to a number of formats: PNG, PS, EPS, PDF and SVG
+  #
+  #Registers methods render_to_cairo_context, to_png, to_ps, to_eps, to_pdf and to_svg
   class CairoOutputter < Outputter
 
     register :render_to_cairo_context
     register :to_png
 
@@ -16,10 +21,11 @@
     register :to_svg if Cairo.const_defined?(:SVGSurface)
 
     attr_writer :x, :y, :xdim, :height, :margin
 
 
+    #Render the barcode onto a Cairo context
     def render_to_cairo_context(context, options={})
       if context.respond_to?(:have_current_point?) and
           context.have_current_point?
         current_x, current_y = context.current_point
       else
@@ -27,27 +33,43 @@
         current_y = y(options) || margin(options)
       end
 
       _xdim = xdim(options)
       _height = height(options)
+      original_current_x = current_x
       context.save do
         context.set_source_color(:black)
         context.fill do
-          barcode.encoding.scan(/(?:0+|1+)/).each do |codes|
-            current_width = _xdim * codes.size
-            if codes[0] == ?1
-              context.rectangle(current_x, current_y, current_width, _height)
+          if barcode.two_dimensional?
+            boolean_groups.each do |groups|
+              groups.each do |bar,amount|
+                current_width = _xdim * amount
+                if bar
+                  context.rectangle(current_x, current_y, current_width, _xdim)
+                end
+                current_x += current_width
+              end
+              current_x = original_current_x
+              current_y += _xdim
             end
-            current_x += current_width
+          else
+            boolean_groups.each do |bar,amount|
+              current_width = _xdim * amount
+              if bar
+                context.rectangle(current_x, current_y, current_width, _height)
+              end
+              current_x += current_width
+            end
           end
         end
       end
 
       context
     end
 
 
+    #Render the barcode to a PNG image
     def to_png(options={})
       output_to_string_io do |io|
         Cairo::ImageSurface.new(options[:format],
                                 full_width(options),
                                 full_height(options)) do |surface|
@@ -56,10 +78,11 @@
         end
       end
     end
 
 
+    #Render the barcode to a PS document
     def to_ps(options={})
       output_to_string_io do |io|
         Cairo::PSSurface.new(io,
                              full_width(options),
                              full_height(options)) do |surface|
@@ -68,15 +91,17 @@
         end
       end
     end
 
 
+    #Render the barcode to an EPS document
     def to_eps(options={})
       to_ps(options.merge(:eps => true))
     end
 
 
+    #Render the barcode to a PDF document
     def to_pdf(options={})
       output_to_string_io do |io|
         Cairo::PDFSurface.new(io,
                               full_width(options),
                               full_height(options)) do |surface|
@@ -84,10 +109,11 @@
         end
       end
     end
 
 
+    #Render the barcode to an SVG document
     def to_svg(options={})
       output_to_string_io do |io|
         Cairo::SVGSurface.new(io,
                               full_width(options),
                               full_height(options)) do |surface|
@@ -104,15 +130,19 @@
     def y(options={})
       @y || options[:y]
     end
 
     def width(options={})
-      barcode.encoding.length * xdim(options)
+      (barcode.two_dimensional? ? encoding.first.length : encoding.length) * xdim(options)
     end
 
     def height(options={})
-      @height || options[:height] || 50
+      if barcode.two_dimensional?
+        encoding.size * xdim(options)
+      else
+        @height || options[:height] || 50
+      end
     end
 
     def full_width(options={})
       width(options) + (margin(options) * 2)
     end
@@ -149,6 +179,7 @@
       context
     end
 
 
   end
+
 end