class Prawn::Document

The Prawn::Document class is how you start creating a PDF document.

There are three basic ways you can instantiate PDF Documents in Prawn, they are through assignment, implicit block or explicit block. Below is an exmple of each type, each example does exactly the same thing, makes a PDF document with all the defaults and puts in the default font “Hello There” and then saves it to the current directory as “example.pdf”

For example, assignment can be like this:

pdf = Prawn::Document.new
pdf.text "Hello There"
pdf.render_file "example.pdf"

Or you can do an implied block form:

Prawn::Document.generate "example.pdf" do
  text "Hello There"
end

Or if you need to access a variable outside the scope of the block, the explicit block form:

words = "Hello There"
Prawn::Document.generate "example.pdf" do |pdf|
  pdf.text words
end

Usually, the block forms are used when you are simply creating a PDF document that you want to immediately save or render out.

See the new and generate methods for further details on the above.

Attributes

default_line_wrap[RW]
font_size[W]
margin_box[RW]
margins[R]
page[RW]
pages[R]
store[R]
y[R]

Public Class Methods

extensions() click to toggle source

Any module added to this array will be included into instances of Prawn::Document at the per-object level. These will also be inherited by any subclasses.

Example:

module MyFancyModule

  def party!
    text "It's a big party!"
  end

end

Prawn::Document.extensions << MyFancyModule

Prawn::Document.generate("foo.pdf") do
  party!
end
# File lib/prawn/document.rb, line 93
def self.extensions
  @extensions ||= []
end
generate(filename,options={},&block) click to toggle source

Creates and renders a PDF document.

When using the implicit block form, Prawn will evaluate the block within an instance of Prawn::Document, simplifying your syntax. However, please note that you will not be able to reference variables from the enclosing scope within this block.

# Using implicit block form and rendering to a file
Prawn::Document.generate "example.pdf" do
  # self here is set to the newly instantiated Prawn::Document
  # and so any variables in the outside scope are unavailable
  font "Times-Roman"
  draw_text "Hello World", :at => [200,720], :size => 32
end

If you need to access your local and instance variables, use the explicit block form shown below. In this case, Prawn yields an instance of PDF::Document and the block is an ordinary closure:

# Using explicit block form and rendering to a file
content = "Hello World"
Prawn::Document.generate "example.pdf" do |pdf|
  # self here is left alone
  pdf.font "Times-Roman"
  pdf.draw_text content, :at => [200,720], :size => 32
end
# File lib/prawn/document.rb, line 128
def self.generate(filename,options={},&block)
  pdf = new(options,&block)
  pdf.render_file(filename)
end
new(options={},&block) click to toggle source

Creates a new PDF Document. The following options are available (with the default values marked in [])

:page_size

One of the Document::PageGeometry sizes [LETTER]

:page_layout

Either :portrait or :landscape

:margin

Sets the margin on all sides in points [0.5 inch]

:left_margin

Sets the left margin in points [0.5 inch]

:right_margin

Sets the right margin in points [0.5 inch]

:top_margin

Sets the top margin in points [0.5 inch]

:bottom_margin

Sets the bottom margin in points [0.5 inch]

:skip_page_creation

Creates a document without starting the first page [false]

:compress

Compresses content streams before rendering them [false]

:optimize_objects

Reduce number of PDF objects in output, at expense of render time [false]

:background

An image path to be used as background on all pages [nil]

:info

Generic hash allowing for custom metadata properties [nil]

:text_options

A set of default options to be handed to text(). Be careful with this.

Setting e.g. the :margin to 100 points and the :left_margin to 50 will result in margins of 100 points on every side except for the left, where it will be 50.

The :margin can also be an array much like CSS shorthand:

# Top and bottom are 20, left and right are 100.
:margin => [20, 100]
# Top is 50, left and right are 100, bottom is 20.
:margin => [50, 100, 20]
# Top is 10, right is 20, bottom is 30, left is 40.
:margin => [10, 20, 30, 40]

Additionally, :page_size can be specified as a simple two value array giving the width and height of the document you need in PDF Points.

Usage:

# New document, US Letter paper, portrait orientation
pdf = Prawn::Document.new

# New document, A4 paper, landscaped
pdf = Prawn::Document.new(:page_size => "A4", :page_layout => :landscape)

# New document, Custom size
pdf = Prawn::Document.new(:page_size => [200, 300])

# New document, with background
pdf = Prawn::Document.new(:background => "#{Prawn::BASEDIR}/data/images/pigs.jpg")
# File lib/prawn/document.rb, line 179
def initialize(options={},&block)   
   Prawn.verify_options [:page_size, :page_layout, :margin, :left_margin, 
     :right_margin, :top_margin, :bottom_margin, :skip_page_creation, 
     :compress, :skip_encoding, :text_options, :background, :info,
     :optimize_objects], options


   # need to fix, as the refactoring breaks this
   # raise NotImplementedError if options[:skip_page_creation]

   self.class.extensions.reverse_each { |e| extend e }
  
   options[:info] ||= {}
   options[:info][:Creator] ||= "Prawn"
   options[:info][:Producer] = "Prawn"

   options[:info].keys.each do |key|
     if options[:info][key].kind_of?(String)
       options[:info][key] = Prawn::LiteralString.new(options[:info][key])
     end
   end
      
   @version = 1.3
   @store = Prawn::Core::ObjectStore.new(options[:info])
   @trailer = {}

   @before_render_callbacks = []
   @on_page_create_callback = nil

   @compress         = options[:compress] || false
   @optimize_objects = options.fetch(:optimize_objects, false)
   @skip_encoding    = options[:skip_encoding]
   @background       = options[:background]
   @font_size        = 12

   @pages            = []
   @page             = nil

   @bounding_box  = nil
   @margin_box    = nil

   @text_options = options[:text_options] || {}
   @default_line_wrap = Prawn::Text::LineWrap.new

   @page_number = 0

   options[:size] = options.delete(:page_size)
   options[:layout] = options.delete(:page_layout)

   if options[:skip_page_creation]
     start_new_page(options.merge(:orphan => true))
   else
     start_new_page(options)
   end
   
   @bounding_box = @margin_box
   
   if block
     block.arity < 1 ? instance_eval(&block) : block[self]
   end
 end

Public Instance Methods

bounding_box(point, options={}, &block) click to toggle source

A bounding box serves two important purposes:

  • Provide bounds for flowing text, starting at a given point

  • Translate the origin (0,0) for graphics primitives

A point and :width must be provided. :height is optional. (See stretchyness below)

Positioning

Bounding boxes are positioned relative to their top left corner and the width measurement is towards the right and height measurement is downwards.

Usage:

  • Bounding box 100pt x 100pt in the absolute bottom left of the containing box:

    pdf.bounding_box(, :width => 100, :height => 100)

    stroke_bounds

    end

  • Bounding box 200pt x 400pt high in the center of the page:

    x_pos = ((bounds.width / 2) - 150) y_pos = ((bounds.height / 2) + 200) pdf.bounding_box([x_pos, y_pos], :width => 300, :height => 400) do

    stroke_bounds

    end

Flowing Text

When flowing text, the usage of a bounding box is simple. Text will begin at the point specified, flowing the width of the bounding box. After the block exits, the cursor position will be moved to the bottom of the bounding box (y - height). If flowing text exceeds the height of the bounding box, the text will be continued on the next page, starting again at the top-left corner of the bounding box.

Usage:

pdf.bounding_box([100,500], :width => 100, :height => 300) do
  pdf.text "This text will flow in a very narrow box starting" +
   "from [100,500]. The pointer will then be moved to [100,200]" +
   "and return to the margin_box"
end

Note, this is a low level tool and is designed primarily for building other abstractions. If you just need to flow text on the page, you will want to look at span() and text_box() instead

Translating Coordinates

When translating coordinates, the idea is to allow the user to draw relative to the origin, and then translate their drawing to a specified area of the document, rather than adjust all their drawing coordinates to match this new region.

Take for example two triangles which share one point, drawn from the origin:

pdf.polygon [0,250], [0,0], [150,100]
pdf.polygon [100,0], [150,100], [200,0]

It would be easy enough to translate these triangles to another point, e.g [200,200]

pdf.polygon [200,450], [200,200], [350,300]
pdf.polygon [300,200], [350,300], [400,200]

However, each time you want to move the drawing, you’d need to alter every point in the drawing calls, which as you might imagine, can become tedious.

If instead, we think of the drawing as being bounded by a box, we can see that the image is 200 points wide by 250 points tall.

To translate it to a new origin, we simply select a point at (x,y+height)

Using the [200,200] example:

pdf.bounding_box([200,450], :width => 200, :height => 250) do
  pdf.stroke do
    pdf.polygon [0,250], [0,0], [150,100]
    pdf.polygon [100,0], [150,100], [200,0]
  end
end

Notice that the drawing is still relative to the origin. If we want to move this drawing around the document, we simply need to recalculate the top-left corner of the rectangular bounding-box, and all of our graphics calls remain unmodified.

Nesting Bounding Boxes

At the top level, bounding boxes are specified relative to the document’s #margin_box (which is itself a bounding box). You can also nest bounding boxes, allowing you to build components which are relative to each other

Usage:

pdf.bounding_box([200,450], :width => 200, :height => 250) do
  pdf.stroke_bounds   # Show the containing bounding box 
  pdf.bounding_box([50,200], :width => 50, :height => 50) do
    # a 50x50 bounding box that starts 50 pixels left and 50 pixels down 
    # the parent bounding box.
    pdf.stroke_bounds
  end
end

Stretchyness

If you do not specify a height to a bounding box, it will become stretchy and its height will be calculated automatically as you stretch the box downwards.

pdf.bounding_box([100,400], :width => 400) do
  pdf.text("The height of this box is #{pdf.bounds.height}")
  pdf.text('this is some text')
  pdf.text('this is some more text')
  pdf.text('and finally a bit more')
  pdf.text("Now the height of this box is #{pdf.bounds.height}")
end

Absolute Positioning

If you wish to position the bounding boxes at absolute coordinates rather than relative to the margins or other bounding boxes, you can use canvas()

pdf.bounding_box([50,500], :width => 200, :height => 300) do
  pdf.stroke_bounds
  pdf.canvas do
    Positioned outside the containing box at the 'real' (300,450)
    pdf.bounding_box([300,450], :width => 200, :height => 200) do
      pdf.stroke_bounds
    end
  end
end

Of course, if you use canvas, you will be responsible for ensuring that you remain within the printable area of your document.

# File lib/prawn/document/bounding_box.rb, line 156
def bounding_box(*args, &block)    
  init_bounding_box(block) do |_|
    map_to_absolute!(args[0])     
    @bounding_box = BoundingBox.new(self, *args)   
  end
end
bounds() click to toggle source

The bounds method returns the current bounding box you are currently in, which is by default the box represented by the margin box on the document itself. When called from within a created bounding_box block, the box defined by that call will be returned instead of the document margin box.

Another important point about bounding boxes is that all x and y measurements within a bounding box code block are relative to the bottom left corner of the bounding box.

For example:

Prawn::Document.new do
  # In the default "margin box" of a Prawn document of 0.5in along each edge

  # Draw a border around the page (the manual way)
  stroke do
    line(bounds.bottom_left, bounds.bottom_right)
    line(bounds.bottom_right, bounds.top_right)
    line(bounds.top_right, bounds.top_left)
    line(bounds.top_left, bounds.bottom_left)
  end

  # Draw a border around the page (the easy way)
  stroke_bounds
end
# File lib/prawn/document.rb, line 408
def bounds
  @bounding_box
end
bounds=(bounding_box) click to toggle source

Sets #bounds to the BoundingBox provided. See above for a brief description of what a bounding box is. This function is useful if you really need to change the bounding box manually, but usually, just entering and exiting bounding box code blocks is good enough.

# File lib/prawn/document.rb, line 417
def bounds=(bounding_box)
  @bounding_box = bounding_box
end
canvas(&block) click to toggle source

A shortcut to produce a bounding box which is mapped to the document’s absolute coordinates, regardless of how things are nested or margin sizes.

pdf.canvas do
  pdf.line pdf.bounds.bottom_left, pdf.bounds.top_right
end
# File lib/prawn/document/bounding_box.rb, line 170
def canvas(&block)     
  init_bounding_box(block, :hold_position => true) do |_|
    @bounding_box = BoundingBox.new(self, [0,page.dimensions[3]], 
      :width => page.dimensions[2], 
      :height => page.dimensions[3] 
    ) 
  end
end
column_box(*args, &block) click to toggle source

A column box is a bounding box with the additional property that when text flows past the bottom, it will wrap first to another column on the same page, and only flow to the next page when all the columns are filled.

#column_box accepts the same parameters as #bounding_box, as well as the number of :columns and a :spacer (in points) between columns.

Defaults are :columns = 3 and :spacer = #font_size

Under PDF::Writer, “spacer” was known as “gutter”

# File lib/prawn/document/column_box.rb, line 23
def column_box(*args, &block)
  init_column_box(block) do |_|
    map_to_absolute!(args[0])
    @bounding_box = ColumnBox.new(self, *args)
  end
end
compression_enabled?() click to toggle source

Returns true if content streams will be compressed before rendering, false otherwise

# File lib/prawn/document.rb, line 555
def compression_enabled?
  !!@compress
end
cursor() click to toggle source

The current y drawing position relative to the innermost bounding box, or to the page margins at the top level.

# File lib/prawn/document.rb, line 331
def cursor
  y - bounds.absolute_bottom
end
define_outline(&block) click to toggle source

See Prawn::Outline#define below for documentation

# File lib/prawn/outline.rb, line 13
def define_outline(&block)
  outline.define(&block)
end
float() { || ... } click to toggle source

Executes a block and then restores the original y position

pdf.text "A"

pdf.float do
  pdf.move_down 100
  pdf.text "C"
end

pdf.text "B"
# File lib/prawn/document.rb, line 353
def float 
  mask(:y) { yield }
end
font(name=nil, options={}) { || ... } click to toggle source

Without arguments, this returns the currently selected font. Otherwise, it sets the current font. When a block is used, the font is applied transactionally and is rolled back when the block exits.

Prawn::Document.generate("font.pdf") do
  text "Default font is Helvetica"

  font "Times-Roman"
  text "Now using Times-Roman"

  font("Chalkboard.ttf") do
    text "Using TTF font from file Chalkboard.ttf"
    font "Courier", :style => :bold
    text "You see this in bold Courier"
  end

  text "Times-Roman, again"
end

The :name parameter must be a string. It can be one of the 14 built-in fonts supported by PDF, or the location of a TTF file. The Font::AFM::BUILT_INS array specifies the valid built in font values.

If a ttf font is specified, the glyphs necessary to render your document will be embedded in the rendered PDF. This should be your preferred option in most cases. It will increase the size of the resulting file, but also make it more portable.

The options parameter is an optional hash providing size and style. To use the :style option you need to map those font styles to their respective font files. See #font_families for more information.

# File lib/prawn/font.rb, line 47
def font(name=nil, options={})
  return((defined?(@font) && @font) || font("Helvetica")) if name.nil?

  raise Errors::NotOnPage if pages.empty? && !page.in_stamp_stream?
  new_font = find_font(name, options)

  if block_given?
    save_font do
      set_font(new_font, options[:size])
      yield
    end
  else
    set_font(new_font, options[:size])
  end

  @font
end
font_families() click to toggle source

Hash that maps font family names to their styled individual font names.

To add support for another font family, append to this hash, e.g:

pdf.font_families.update(
 "MyTrueTypeFamily" => { :bold        => "foo-bold.ttf",
                         :italic      => "foo-italic.ttf",
                         :bold_italic => "foo-bold-italic.ttf",
                         :normal      => "foo.ttf" })

This will then allow you to use the fonts like so:

pdf.font("MyTrueTypeFamily", :style => :bold)
pdf.text "Some bold text"
pdf.font("MyTrueTypeFamily")
pdf.text "Some normal text"

This assumes that you have appropriate TTF fonts for each style you wish to support.

By default the styles :bold, :italic, :bold_italic, and :normal are defined for fonts “Courier”, “Times-Roman” and “Helvetica”.

You probably want to provide those four styles, but are free to define custom ones, like :thin, and use them in font calls.

# File lib/prawn/font.rb, line 177
def font_families
  @font_families ||= Hash.new { |h,k| h[k] = {} }.merge!(
    { "Courier"     => { :bold        => "Courier-Bold",
                         :italic      => "Courier-Oblique",
                         :bold_italic => "Courier-BoldOblique",
                         :normal      => "Courier" },

      "Times-Roman" => { :bold         => "Times-Bold",
                         :italic       => "Times-Italic",
                         :bold_italic  => "Times-BoldItalic",
                         :normal       => "Times-Roman" },

      "Helvetica"   => { :bold         => "Helvetica-Bold",
                         :italic       => "Helvetica-Oblique",
                         :bold_italic  => "Helvetica-BoldOblique",
                         :normal       => "Helvetica" }
    })
end
font_size(points=nil) { |: return| ... } click to toggle source

When called with no argument, returns the current font size. When called with a single argument but no block, sets the current font size. When a block is used, the font size is applied transactionally and is rolled back when the block exits. You may still change the font size within a transactional block for individual text segments, or nested calls to font_size.

Prawn::Document.generate("font_size.pdf") do
  font_size 16
  text "At size 16"

  font_size(10) do
    text "At size 10"
    text "At size 6", :size => 6
    text "At size 10"
  end

  text "At size 16"
end

When called without an argument, this method returns the current font size.

# File lib/prawn/font.rb, line 88
def font_size(points=nil)
  return @font_size unless points
  size_before_yield = @font_size
  @font_size = points
  block_given? ? yield : return
  @font_size = size_before_yield
end
go_to_page(k) click to toggle source

Re-opens the page with the given (1-based) page number so that you can draw on it. Does not restore page state such as margins, page orientation, or paper size, so you’ll have to handle that yourself.

See #number_pages for a sample usage of this capability.

# File lib/prawn/document.rb, line 318
def go_to_page(k)
  @page_number = k
  self.page = pages[k-1]
end
group(second_attempt=false) { || ... } click to toggle source

Attempts to group the given block vertically within the current context. First attempts to render it in the current position on the current page. If that attempt overflows, it is tried anew after starting a new context (page or column).

Raises CannotGroup if the provided content is too large to fit alone in the current page or column.

# File lib/prawn/document.rb, line 509
def group(second_attempt=false)
  old_bounding_box = @bounding_box
  @bounding_box = SimpleDelegator.new(@bounding_box)

  def @bounding_box.move_past_bottom
    raise RollbackTransaction
  end

  success = transaction { yield }

  unless success
    raise Prawn::Errors::CannotGroup if second_attempt
    old_bounding_box.move_past_bottom
    group(second_attempt=true) { yield }
  end 

  @bounding_box = old_bounding_box
end
indent(x, &block) click to toggle source

Indents the specified number of PDF points for the duration of the block

pdf.text "some text"
pdf.indent(20) do
  pdf.text "This is indented 20 points"
end
pdf.text "This starts 20 points left of the above line " +
         "and is flush with the first line"
# File lib/prawn/document.rb, line 486
def indent(x, &block)
  bounds.indent(x, &block)
end
move_cursor_to(new_y) click to toggle source

Moves to the specified y position in relative terms to the bottom margin.

# File lib/prawn/document.rb, line 338
def move_cursor_to(new_y)
  self.y = new_y + bounds.absolute_bottom
end
move_down(n) click to toggle source

Moves down the document by n points relative to the current position inside the current bounding box.

# File lib/prawn/document.rb, line 431
def move_down(n)
  self.y -= n
end
move_up(n) click to toggle source

Moves up the document by n points relative to the current position inside the current bounding box.

# File lib/prawn/document.rb, line 424
def move_up(n)
  self.y += n
end
number_pages(string, position) click to toggle source

Specify a template for page numbering. This should be called towards the end of document creation, after all your content is already in place. In your template string, <page> refers to the current page, and <total> refers to the total amount of pages in the doucment.

Example:

Prawn::Document.generate("page_with_numbering.pdf") do
  text "Hai"
  start_new_page
  text "bai"
  start_new_page
  text "-- Hai again"
  number_pages "<page> in a total of <total>", [bounds.right - 50, 0]  
end
# File lib/prawn/document.rb, line 544
def number_pages(string, position)
  page_count.times do |i|
    go_to_page(i+1)
    str = string.gsub("<page>","#{i+1}").gsub("<total>","#{page_count}")
    draw_text str, :at => position
  end
end
outline() click to toggle source

Lazily instantiates an Outline object for document. This is used as point of entry to methods to build the outline tree.

# File lib/prawn/outline.rb, line 26
def outline
  @outline ||= Outline.new(self)
end
outline_root(outline_root) click to toggle source

The Outline dictionary (12.3.3) for this document. It is lazily initialized, so that documents that do not have an outline do not incur the additional overhead.

# File lib/prawn/outline.rb, line 20
def outline_root(outline_root)
  @store.root.data[:Outlines] ||= ref!(outline_root)
end
pad(y) { || ... } click to toggle source

Moves down the document by y, executes a block, then moves down the document by y again.

pdf.text "some text"
pdf.pad(100) do
  pdf.text "This is 100 points below the previous line of text"
end
pdf.text "This is 100 points below the previous line of text"
# File lib/prawn/document.rb, line 470
def pad(y)
  move_down(y)
  yield
  move_down(y)
end
pad_bottom(y) { || ... } click to toggle source

Executes a block then moves down the document

pdf.text "some text"
pdf.pad_bottom(100) do
  pdf.text "This text appears right below the previous line of text"
end
pdf.text "This is 100 points below the previous line of text"
# File lib/prawn/document.rb, line 456
def pad_bottom(y)
  yield
  move_down(y)
end
pad_top(y) { || ... } click to toggle source

Moves down the document and then executes a block.

pdf.text "some text"
pdf.pad_top(100) do
  pdf.text "This is 100 points below the previous line of text"
end
pdf.text "This text appears right below the previous line of text"
# File lib/prawn/document.rb, line 443
def pad_top(y)
  move_down(y)
  yield
end
page_count() click to toggle source

Returns the number of pages in the document

pdf = Prawn::Document.new
pdf.page_count #=> 1
3.times { pdf.start_new_page }
pdf.page_count #=> 4
# File lib/prawn/document.rb, line 301
def page_count
  pages.length
end
page_number() click to toggle source

Returns the 1-based page number of the current page. Returns 0 if the document has no pages.

# File lib/prawn/document.rb, line 308
def page_number
  @page_number
end
render() click to toggle source

Renders the PDF document to string

# File lib/prawn/document.rb, line 359
def render
  output = StringIO.new
  finalize_all_page_contents

  render_header(output)
  render_body(output)
  render_xref(output)
  render_trailer(output)
  str = output.string
  str.force_encoding("ASCII-8BIT") if str.respond_to?(:force_encoding)
  str
end
render_file(filename) click to toggle source

Renders the PDF document to file.

pdf.render_file "foo.pdf"
# File lib/prawn/document.rb, line 376
def render_file(filename)
  Kernel.const_defined?("Encoding") ? mode = "wb:ASCII-8BIT" : mode = "wb"
  File.open(filename,mode) { |f| f << render }
end
repeat(page_filter, options={}, &block) click to toggle source

Provides a way to execute a block of code repeatedly based on a page_filter. Since Stamp is used under the hood, this method is very space efficient.

Available page filters are:

:all        -- repeats on every page
:odd        -- repeats on odd pages
:even       -- repeats on even pages
some_array  -- repeats on every page listed in the array
some_range  -- repeats on every page included in the range
some_lambda -- yields page number and repeats for true return values

Also accepts an optional second argument for dynamic content which executes the code in the context of the filtered pages without using a Stamp.

Example:

Prawn::Document.generate("repeat.pdf", :skip_page_creation => true) do

  repeat :all do
    draw_text "ALLLLLL", :at => bounds.top_left
  end

  repeat :odd do
    draw_text "ODD", :at => [0,0]
  end

  repeat :even do
    draw_text "EVEN", :at => [0,0]
  end

  repeat [1,2] do 
    draw_text "[1,2]", :at => [100,0]
  end

  repeat 2..4 do
    draw_text "2..4", :at => [200,0]
  end

  repeat(lambda { |pg| pg % 3 == 0 }) do
    draw_text "Every third", :at => [250, 20]
  end

  10.times do 
    start_new_page
    draw_text "A wonderful page", :at => [400,400]
  end

  repeat(:all, :dynamic => true) do
    text page_number, :at => [500, 0]
  end

end
# File lib/prawn/repeater.rb, line 75
def repeat(page_filter, options={}, &block)
  repeaters << Prawn::Repeater.new(self, page_filter, !!options[:dynamic], &block)
end
repeaters() click to toggle source

A list of all repeaters in the document. See #repeat for details

# File lib/prawn/repeater.rb, line 17
def repeaters
  @repeaters ||= []
end
save_font() { || ... } click to toggle source

Saves the current font, and then yields. When the block finishes, the original font is restored.

# File lib/prawn/font.rb, line 107
def save_font
  @font ||= find_font("Helvetica")
  original_font = @font
  original_size = @font_size

  yield
ensure
  set_font(original_font, original_size) if original_font
end
span(width, options={}) click to toggle source

A span is a special purpose bounding box that allows a column of elements to be positioned relative to the margin_box.

Arguments:

width

The width of the column in PDF points

Options:

:position

One of :left, :center, :right or an x offset

This method is typically used for flowing a column of text from one page to the next.

span(350, :position => :center) do
  text "Here's some centered text in a 350 point column. " * 100
end
# File lib/prawn/document/span.rb, line 26
    def span(width, options={})
      Prawn.verify_options [:position], options
      original_position = self.y      
     
      # FIXME: Any way to move this upstream?
      left_boundary = case(options[:position] || :left)
      when :left
        margin_box.absolute_left
      when :center
        margin_box.absolute_left + margin_box.width / 2.0 - width %r2.0
      when :right
        margin_box.absolute_right - width
      when Numeric
        margin_box.absolute_left + options[:position]
      else
        raise ArgumentError, "Invalid option for :position"
      end
      
      # we need to bust out of whatever nested bounding boxes we're in.
      canvas do
        bounding_box([left_boundary, 
                      margin_box.absolute_top], :width => width) do
          self.y = original_position
          yield
        end
      end          
    end
  end
end
start_new_page(options = {}) click to toggle source

Creates and advances to a new page in the document.

Page size, margins, and layout can also be set when generating a new page. These values will become the new defaults for page creation

pdf.start_new_page #=> Starts new page keeping current values
pdf.start_new_page(:size => "LEGAL", :layout => :landscape)
pdf.start_new_page(:left_margin => 50, :right_margin => 50)
pdf.start_new_page(:margin => 100)
# File lib/prawn/document.rb, line 251
 def start_new_page(options = {})
   if last_page = page
     last_page_size    = last_page.size
     last_page_layout  = last_page.layout
     last_page_margins = last_page.margins
   end

   self.page = Prawn::Core::Page.new(self, 
     :size    => options[:size]   || last_page_size, 
     :layout  => options[:layout] || last_page_layout,
     :margins => last_page_margins )
  
   
   apply_margin_option(options) if options[:margin]

   [:left,:right,:top,:bottom].each do |side|
     if margin = options[:"#{side}_margin"]
       page.margins[side] = margin
     end
   end

   generate_margin_box

   update_colors
   undash if dashed?
  
   unless options[:orphan]
     pages.insert(@page_number, page)
     @store.pages.data[:Kids].insert(@page_number, page.dictionary)
     @store.pages.data[:Count] += 1
     @page_number += 1

     save_graphics_state
    
     canvas { image(@background, :at => bounds.top_left) } if @background 
     @y = @bounding_box.absolute_top

     float do
       @on_page_create_callback.call(self) if @on_page_create_callback 
     end
   end
end
width_of(string, options={}) click to toggle source

Returns the width of the given string using the given font. If :size is not specified as one of the options, the string is measured using the current font size. You can also pass :kerning as an option to indicate whether kerning should be used when measuring the width (defaults to false).

Note that the string must be encoded properly for the font being used. For AFM fonts, this is WinAnsi. For TTF, make sure the font is encoded as UTF-8. You can use the Prawn::Font#normalize_encoding method to make sure strings are in an encoding appropriate for the current font.

# File lib/prawn/font.rb, line 215
def width_of(string, options={})
  font.compute_width_of(string, options)
end
y=(new_y) click to toggle source
# File lib/prawn/document.rb, line 323
def y=(new_y)
  @y = new_y
  bounds.update_height
end