Fix example_helper.rb require on all examples

Since '.' is no longer in the $LOAD_PATH in Ruby 1.9.2, we have to run
an expand_path over the resulting path from File.dirname(__FILE__).

Closes prawnpdf#154.

examples/bounding_box/bounding_boxes.rb

@@ -3,7 +3,8 @@
 # This example demonstrates the basic functionality of Prawn's bounding boxes.
 # Note that top level bounding boxes are positioned relative to the margin_box.
 # 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("bounding_boxes.pdf") do
 
@@ -40,4 +41,4 @@
     end
   end
 
-end                 
+end                 

examples/bounding_box/indentation.rb

@@ -3,7 +3,8 @@
 # This example demonstrates the basic functionality of Prawn's bounding boxes.
 # Note that top level bounding boxes are positioned relative to the margin_box.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("indentation.pdf") do
 

examples/bounding_box/russian_boxes.rb

@@ -4,7 +4,8 @@
 # can simplify calculations.  See the other files in examples/bounding_box
 # for more basic uses.
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 class Array
   def combine(arr)
@@ -33,4 +34,4 @@ def recurse_bounding_box(pdf, max_depth=5, depth=1)
 
 Prawn::Document.generate("russian_boxes.pdf") do |pdf|
   recurse_bounding_box(pdf)
-end
+end

examples/bounding_box/stretched_nesting.rb

@@ -3,7 +3,8 @@
 # This example demonstrates how nested bounding boxes work when the outer box is
 # stretchy and includes several inner boxes of different sizes.
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("stretched_nesting.pdf", :page_layout => :landscape) do
 

examples/general/background.rb

@@ -4,7 +4,8 @@
 # generating a new Document.  Image is assumed to be pre-fit for your page
 # size, and will not be rescaled.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 img = "#{Prawn::BASEDIR}/data/images/letterhead.jpg"
 

examples/general/canvas.rb

@@ -3,7 +3,8 @@
 # Demonstrates how to enable absolute positioning in Prawn by temporarily
 # removing the margin_box via Document#canvas()
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("canvas.pdf") do
   canvas do

examples/general/context_sensitive_headers.rb

@@ -1,4 +1,5 @@
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 # Ex. Generate a roster of meeting attendees given a set of meetings.
 # Attendees for a meeting may overflow to accross page boundaries but 

examples/general/float.rb

@@ -1,4 +1,5 @@
-require "#{File.dirname(__FILE__)}/../example_helper"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate('float.pdf') do
   float do

examples/general/margin.rb

@@ -2,7 +2,8 @@
 #
 # This demonstrates the Prawn options for document and page margin, similar to CSS shorthand.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 LOREM = ("Lorem ipsum dolor sit amet, consectetur adipisicing elit, "+
 "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. "+

examples/general/measurement_units.rb

@@ -5,7 +5,8 @@
 # its particular implementation, though some might find that interesting as
 # well.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 require "prawn/measurement_extensions"
 

examples/general/metadata-info.rb

@@ -3,7 +3,8 @@
 # Demonstrates how to set metadata properties via the info option
 # It allows one to specify no standard properties
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate "metadata-info.pdf",
   :info => {

examples/general/multi_page_layout.rb

@@ -3,7 +3,8 @@
 # This demonstrates that Prawn can modify page size, margins and layout for 
 # each individual page, via Document#start_new_page()
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("multi-layout.pdf", :page_layout => :landscape) do |pdf|
    pdf.text "This is on a landscaped page" 

examples/general/outlines.rb

@@ -3,7 +3,8 @@
 # This example demonstrates the use of the the outlines option for a new document
 # it sets an initial outline item with a title
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate('outlines.pdf') do
   text "Page 1. This is the first Chapter. "

examples/general/page_geometry.rb

@@ -4,7 +4,8 @@
 # documents.  The style used here is a bit out of date, see 
 # multi_page_layout.rb for a more modern example.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 def pdf(*options)  
   Prawn::Document.new(*options)

examples/general/page_numbering.rb

@@ -3,7 +3,8 @@
 # This example demonstrates how to add a "page k of n"
 # template to your documents.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("page_with_numbering.pdf") do
   text "Hai"

examples/general/repeaters.rb

@@ -5,7 +5,8 @@
 # they should be pretty efficient.
 #
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("repeat.pdf", :skip_page_creation => true) do
 

examples/general/stamp.rb

@@ -2,7 +2,8 @@
 #
 # Demonstrate use of stamps
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("stamp.pdf", :skip_page_creation => true) do
 

examples/general/templates.rb

@@ -3,7 +3,8 @@
 # This sample demonstrates the use of the :template option when generating
 # a new Document. The template PDF file is imported into a new document.
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 filename = "#{Prawn::BASEDIR}/reference_pdfs/curves.pdf"
 

examples/graphics/basic_images.rb

@@ -4,7 +4,8 @@
 # For positioning images alongside flowing text, see the image_flow.rb
 # example.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("basic_images.pdf", :page_layout => :landscape) do     
   stef = "#{Prawn::BASEDIR}/data/images/stef.jpg"

examples/graphics/cmyk.rb

@@ -2,7 +2,8 @@
 #
 # Demonstrates Prawn's support for CMYK images and colors.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("cmyk.pdf", :page_layout => :landscape) do
   fill_color 50, 100, 0, 0

examples/graphics/curves.rb

@@ -2,10 +2,11 @@
 #
 # Demonstrates simple curve and circle usage
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 pdf = Prawn::Document.new
 pdf.move_to [100,100]
 pdf.stroke_curve_to [50,50], :bounds => [[60,90], [60, 90]]  
 pdf.fill_circle_at [200,200], :radius => 10
-pdf.render_file "curves.pdf"
+pdf.render_file "curves.pdf"

examples/graphics/hexagon.rb

@@ -2,12 +2,13 @@
 #
 # Draws and fills a Hexagon using Document#polygon
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 pdf = Prawn::Document.new
 
 pdf.fill_color "ff0000"
 pdf.fill_polygon [100, 250], [200, 300], [300, 250],
                  [300, 150], [200, 100], [100, 150]            
 
-pdf.render_file "hexagon.pdf"
+pdf.render_file "hexagon.pdf"

examples/graphics/image_fit.rb

@@ -4,12 +4,13 @@
 # The image will be scaled down to fit within the box, while preserving
 # the aspect ratio.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("image_fit.pdf", :page_layout => :landscape) do
 
   pigs = "#{Prawn::BASEDIR}/data/images/pigs.jpg" 
   stroke_rectangle [50,450], 200, 200
   image pigs, :at => [50,450], :fit => [200,200]
 
-end
+end

examples/graphics/image_flow.rb

@@ -5,7 +5,8 @@
 # useful when used in combination with flowing text, where the exact final
 # position of the image is not known ahead of time.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("image-flow.pdf", :page_layout => :landscape) do  
   self.font_size = 8                           

examples/graphics/image_position.rb

@@ -2,8 +2,9 @@
 #
 # Demonstrates vertical and horizontal positioning of images.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
-
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
+
 Prawn::Document.generate("image_position.pdf", :page_layout => :landscape) do
 
   dice = "#{Prawn::BASEDIR}/data/images/dice.png"

examples/graphics/line.rb

@@ -2,7 +2,8 @@
 #
 # The very first Prawn example.  Here for nostalgia's sake.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 pdf = Prawn::Document.new   
 pdf.line_width = 10    

examples/graphics/png_types.rb

@@ -3,7 +3,8 @@
 # PNG files come in different flavours - 5 of them. This example embeds
 # one of each type as proof that they all work.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 images = [
           ["Type 0", "#{Prawn::BASEDIR}/data/images/web-links.png"],
@@ -19,4 +20,4 @@
     text header
     image file, :at => [50,450]
   end
-end
+end

examples/graphics/polygons.rb

@@ -2,7 +2,8 @@
 # 
 # Basic polygon drawing example.  See also: hexagon.rb
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 pdf = Prawn::Document.new
 
@@ -13,4 +14,4 @@
   pdf.stroke_rectangle [0,600], 5*i, 10*i  
 end
 
-pdf.render_file "pretty_polygons.pdf"
+pdf.render_file "pretty_polygons.pdf"

examples/graphics/remote_images.rb

@@ -3,7 +3,8 @@
 # Demonstrates how to use open-uri and Document#image to embed remote image
 # files.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 require "open-uri"
 

examples/graphics/rounded_polygons.rb

@@ -1,4 +1,5 @@
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 def radian(degree)
   Math::PI/180*degree

examples/graphics/rounded_rectangle.rb

@@ -3,7 +3,8 @@
 # Rounded rectangle example demonstrating both stroke and stroke and fill. 
 # A rectangle with rounded join_style is added just for comparison.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 pdf = Prawn::Document.new
 pdf.font_size 8

examples/graphics/ruport_style_helpers.rb

@@ -3,7 +3,8 @@
 # These helpers will be familiar to Ruport users, and now are supported
 # directly in Prawn.   Run the example to see how they work.
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 # Demonstrates some features stolen from Ruport::Formatter::PDF
 Prawn::Document.generate("ruport.pdf") do
@@ -16,4 +17,4 @@
   stroke_horizontal_line 50, 100
   stroke_horizontal_line 50, 100, :at => 300
   stroke_vertical_line 300, 50, :at => 250
-end
+end

examples/graphics/stroke_bounds.rb

@@ -8,7 +8,8 @@
 # Feature borrowed from Josh Knowle's pt at:
 # http://github.com/joshknowles/pt/tree/master
 #
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("stroke_bounds.pdf") do 
   stroke_bounds

examples/graphics/stroke_cap_and_join.rb

@@ -2,7 +2,8 @@
 #
 # Stroke dashing can be applied to any line or curve
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("stroke_cap_and_join.pdf") do
   self.line_width = 25

examples/graphics/stroke_dash.rb

@@ -2,7 +2,8 @@
 #
 # Stroke dashing can be applied to any line or curve
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 Prawn::Document.generate("stroke_dash.pdf") do
   self.line_width = 1