Prawnpdf
========

PrawnPDF is a Ruby module and also Rails plugin which implements
the well-known FPDF API for generating PDF files on top of the
Prawn library.

It's really not meant for developing new code; in general,
using the Prawn API directly is far superior.  However, in
the cases below it may be handy.

1.  You have a lot of FPDF-dependent code, but you want to
	support CJK languages or take advantage of other 
	font infrastructure in Prawn.
	
	This is actually why this module was developed;
	I needed Japanese PDF export in Redmine, and didn't
	want to port the extensive PDF-generating code
	itself (not least because of the size of the diff
	it would generate).
	
2.	Although you could port the code to Prawn, you would have 
	a version-dependent solution.
	
	Again, I wanted to make a patch for Redmine that
	would work on any version from 1.0 forward.  There
	have been a lot of changes in the Redmine PDF code
	because of improvements in other things; in order to
	stay out of other people's way, I decided to just
	hijack the existing API.

Again, before Prawn devotees send hate mail, I totally recommend
writing new from-scratch code directly against the Prawn API.

That said, to a limited extent, you can access some Prawn features
from PrawnPDF programs; the underlying Prawn::Document
object is available via the :pdoc method.  You can use
that for tiny things like being able to set the line dash;
however, Prawn and FPDF have very different layout 
algorithms so any large-scale mix-and-matching is going
to give you a lot of headaches.

When run independently, PrawnPDF has no dependencies other
than Prawn itself.  

Note: PrawnPDF will not work with the current Prawn GEM, 0.8.4.
I was working with Prawn tip as of November 30, 2010.
See below for more details.  Also PrawnPDF had to resort to
some eggregious subclassing to make some of the details of
the FPDF layout algorithm work.  I've posted most of these to
the Prawn mailing lists to hunt for a resolution, but there's 
no guarantee that will work into the indefinite future since 
Prawn is pre-1.0.

Installation and Test - Standalone
==================================
I've only tested PrawnPDF on Mac OS X and Linux.  It shouldn't
have any particular system dependencies, but the installation
instructions are shell-dependent because of that.

To use PrawnPDF, first make sure you have a working copy of Prawn.
You should not install Prawn as a gem just yet, so the instructions
below assume you're going to put Prawn in /usr/local/src.
	cd /usr/local/src
	git clone https://github.com/sandal/prawn.git
	cd prawn
	# If you want to live on the edge, skip this, but here's 
	# the exact commit I used for development:
	git checkout f7cd1c7c9629b4a897cc76bdf016ad320e52fedb
	# Now the submodules
	git submodule init
	git submodule update
	# Now make sure your Prawn works
	cd examples/text
	ruby simple_text.rb
	open simple_text.pdf # Or otherwise verify the file is OK
Alright, your Prawn works!  You're mostly done.
	cd /usr/local/src
	git clone httpd://github.com/leovitch/prawnpdf.git
	cd prawnpdf
	cd test
	ruby -I /usr/local/src/prawn/lib tutorial.rb
	open test_output/*.pdf # Or otherwise verify the files
						   # in test_output look like the ones
						   # in reference_output

Example - Standalone
====================

	cd /usr/local/src/prawnpdf/lib
	irb -I /usr/local/src/prawn/lib
	
	require 'prawnpdf'
	pdf = PrawnPDF::PPDF.new
	pdf.AddPage
	pdf.SetFont(nil,"B",36)
	pdf.Write(nil,"Hello World")
	pdf.Output("/tmp/HelloWorld.pdf")

See test/tutorial.rb for ports of all of the FPDF tutorials.

Installation and Test -- Rails
==============================

Installing as a Rails plugin is about the same except for where
the directories go.  The odd thing I found is that you have to 
make up a version number for the Prawn release to get it to function
in the gems directory (and it didn't seem to to work if placed
in the plugins directory).

	# Assuming you're already in the root of your Rails app
	cd vendors/gems
	# My made-up "release number"
	git clone https://github.com/sandal/prawn.git prawn-0.11.1
	cd prawn-0.11.1
	# If you want to live on the edge, skip this:
	git checkout f7cd1c7c9629b4a897cc76bdf016ad320e52fedb
	# Now the submodules
	git submodule init
	git submodule update
	# Now make sure your Prawn works
	cd examples/text
	ruby simple_text.rb
	
PrawnPDF itself installs in the plugins directory, of course.

	cd ../../../../plugins/
	git clone httpd://github.com/leovitch/prawnpdf.git
	# run tests
	cd prawnpdf
	rake
	open test/test_output/TestIssue.pdf
	# ...or otherwise verify it's the same as 
	# test/reference_output/TestIssue.pdf
	
Switching your RFPDF Rails app to PrawnPDF
==========================================
In general, this should be as simple as replacing
	require 'rfpdf/fpdf'
	pdf = FPDF.new
with
	require 'prawnpdf'
	pdf = PrawnPDF::RPDF.new

You should probably update any locales that might 
need their own font. 

PrawnPDF supports configuring each language with a 
reasonable set of normal, bold, italic, and bold italic
default fonts.  Set these constants in your locale
files to the pathname of a TTF font on your server:
	:default_pdf_normal_font
	:default_pdf_bold_font
	:default_pdf_italic_font
	:default_pdf_bold_italic_font
No preprocessing or other manipulation of the fonts
is needed.

The above are all optional; if you don't set any of 
them, you'll just use Helvetica.  Also, if in a particular 
locale you only set :default_pdf_normal_font (because that's
all you have), it will be used for all four faces.
	
Example - Rails
===============
Well, this isn't something you're going to type at the console.
Take a look at the self-test in test/prawnpdf_test.rb for a 
reasonably extensive example.



Copyright (c) 2010 Leo Hourvitz, released under the MIT license