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.
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 85 def self.extensions @extensions ||= [] end
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 120 def self.generate(filename,options={},&block) pdf = new(options,&block) pdf.render_file(filename) end
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]
:background_scale
Backgound image scale [1] [nil]
:info
Generic hash allowing for custom metadata properties [nil]
:template
The path to an existing PDF file to use as a template [nil]
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::DATADIR}/images/pigs.jpg")
# File lib/prawn/document.rb, line 172 def initialize(options={},&block) options = options.dup Prawn.verify_options [:page_size, :page_layout, :margin, :left_margin, :right_margin, :top_margin, :bottom_margin, :skip_page_creation, :compress, :skip_encoding, :background, :info, :optimize_objects, :template], options # need to fix, as the refactoring breaks this # raise NotImplementedError if options[:skip_page_creation] self.class.extensions.reverse_each { |e| extend e } @internal_state = Prawn::Core::DocumentState.new(options) @internal_state.populate_pages_from_store(self) min_version(state.store.min_version) if state.store.min_version @background = options[:background] @background_scale = options[:background_scale] || 1 @font_size = 12 @bounding_box = nil @margin_box = nil @page_number = 0 options[:size] = options.delete(:page_size) options[:layout] = options.delete(:page_layout) if options[:template] fresh_content_streams(options) go_to_page(1) else if options[:skip_page_creation] || options[:template] start_new_page(options.merge(:orphan => true)) else start_new_page(options) end end @bounding_box = @margin_box if block block.arity < 1 ? instance_eval(&block) : block[self] end end
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)
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
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
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.
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
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
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(pt, *args, &block) init_bounding_box(block) do |parent_box| pt = map_to_absolute(pt) @bounding_box = BoundingBox.new(self, parent_box, pt, *args) end end
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 407 def bounds @bounding_box end
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 422 def bounds=(bounding_box) @bounding_box = bounding_box end
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 |_| # Canvas bbox acts like margin_box in that its parent bounds are unset. @bounding_box = BoundingBox.new(self, nil, [0,page.dimensions[3]], :width => page.dimensions[2], :height => page.dimensions[3] ) end end
Instantiates and draws a cell on the document.
cell(:content => "Hello world!", :at => [12, 34])
See Prawn::Table::Cell.make for full options.
# File lib/prawn/table/cell.rb, line 18 def cell(options={}) cell = Table::Cell.make(self, options.delete(:content), options) cell.draw cell end
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 22 def column_box(*args, &block) init_column_box(block) do |parent_box| map_to_absolute!(args[0]) @bounding_box = ColumnBox.new(self, parent_box, *args) end end
Returns true if content streams will be compressed before rendering, false otherwise
# File lib/prawn/document.rb, line 640 def compression_enabled? !!state.compress end
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 325 def cursor y - bounds.absolute_bottom end
Defines the grid system for a particular document. Takes the number of rows and columns and the width to use for the gutter as the keys :rows, :columns, :gutter, :row_gutter, :column_gutter
# File lib/prawn/layout/grid.rb, line 8 def define_grid(options = {}) @grid = Grid.new(self, options) end
Executes a block and then restores the original y position. If new pages were created during this block, it will teleport back to the original page when done.
pdf.text "A" pdf.float do pdf.move_down 100 pdf.text "C" end pdf.text "B"
# File lib/prawn/document.rb, line 348 def float original_page = page_number original_y = y yield go_to_page(original_page) unless page_number == original_page self.y = original_y end
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? if state.pages.empty? && !state.page.in_stamp_stream? raise Prawn::Errors::NotOnPage end new_font = find_font(name.to_s, 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
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 180 def font_families @font_families ||= Hash.new.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
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 91 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
Re-opens the page with the given (1-based) page number so that you can draw on it.
See #number_pages for a sample usage of this capability.
# File lib/prawn/document.rb, line 310 def go_to_page(k) @page_number = k state.page = state.pages[k-1] generate_margin_box @y = @bounding_box.absolute_top end
A method that can either be used to access a particular grid on the page or work with the grid system directly.
@pdf.grid # Get the Grid directly @pdf.grid([0,1]) # Get the box at [0,1] @pdf.grid([0,1], [1,2]) # Get a multi-box spanning from [0,1] to [1,2]
# File lib/prawn/layout/grid.rb, line 19 def grid(*args) @boxes ||= {} @boxes[args] ||= if args.empty? @grid else g1, g2 = args if(g1.class == Array && g2.class == Array && g1.length == 2 && g2.length == 2) multi_box(single_box(*g1), single_box(*g2)) else single_box(g1, g2) end end end
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). Returns a logically true value if the content fits in one page/column, false if a new page or column was needed.
Raises CannotGroup if the provided content is too large to fit alone in the current page or column.
# File lib/prawn/document.rb, line 518 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 } @bounding_box = old_bounding_box unless success raise Prawn::Errors::CannotGroup if second_attempt old_bounding_box.move_past_bottom group(second_attempt=true) { yield } end success end
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" pdf.indent 20, 20 do pdf.text "This line is indented on both sides." end
# File lib/prawn/document.rb, line 494 def indent(left, right = 0, &block) bounds.indent(left, right, &block) end
Set up, but do not draw, a cell. Useful for creating cells with formatting
options to be inserted into a Table. Call
draw
on the resulting Cell to ink it.
See the documentation on Prawn::Cell for details on the arguments.
# File lib/prawn/table/cell.rb, line 30 def make_cell(content, options={}) Prawn::Table::Cell.make(self, content, options) end
Set up, but do not draw, a table. Useful for creating subtables to be
inserted into another Table. Call
draw
on the resulting Table to ink
it.
See the documentation on Prawn::Table for details on the arguments.
# File lib/prawn/table.rb, line 36 def make_table(data, options={}, &block) Table.new(data, self, options, &block) end
Moves to the specified y position in relative terms to the bottom margin.
# File lib/prawn/document.rb, line 331 def move_cursor_to(new_y) self.y = new_y + bounds.absolute_bottom end
Moves down the document by n points relative to the current position inside the current bounding box.
# File lib/prawn/document.rb, line 436 def move_down(n) self.y -= n end
Moves up the document by n points relative to the current position inside the current bounding box.
# File lib/prawn/document.rb, line 429 def move_up(n) self.y += n end
Places a text box on specified pages 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 document. Page numbering should occur at the end of your ::generate block because the method iterates through existing pages after they are created.
Parameters are:
string
Template string for page number wording. Should include '<page>' and, optionally, '<total>'.
options
A hash for page numbering and text box options.
:page_filter
A filter to specify which pages to place page numbers on. Refer to the method 'page_match?'
:start_count_at
The starting count to increment pages from.
:total_pages
If provided, will replace <total> with the value given. Useful to override the total number of pages when using the start_count_at option.
:color
Text fill color.
Please refer to Prawn::Text::text_box for additional options concerning text formatting and placement.
Example: Print page numbers on every page except for the first. Start counting from
five. Prawn::Document.generate("page_with_numbering.pdf") do number_pages "<page> in a total of <total>", {:start_count_at => 5, :page_filter => lambda{ |pg| pg != 1 }, :at => [bounds.right - 50, 0], :align => :right, :size => 14} end
# File lib/prawn/document.rb, line 574 def number_pages(string, options={}) opts = options.dup start_count_at = opts.delete(:start_count_at).to_i page_filter = if opts.has_key?(:page_filter) opts.delete(:page_filter) else :all end total_pages = opts.delete(:total_pages) txtcolor = opts.delete(:color) # An explicit height so that we can draw page numbers in the margins opts[:height] = 50 unless opts.has_key?(:height) start_count = false pseudopage = 0 (1..page_count).each do |p| unless start_count pseudopage = case start_count_at when 0 1 else start_count_at.to_i end end if page_match?(page_filter, p) go_to_page(p) # have to use fill_color here otherwise text reverts back to default fill color fill_color txtcolor unless txtcolor.nil? total_pages = total_pages.nil? ? page_count : total_pages str = string.gsub("<page>","#{pseudopage}").gsub("<total>","#{total_pages}") text_box str, opts start_count = true # increment page count as soon as first match found end pseudopage += 1 if start_count end end
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 14 def outline @outline ||= Outline.new(self) end
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 475 def pad(y) move_down(y) yield move_down(y) end
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 461 def pad_bottom(y) yield move_down(y) end
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 448 def pad_top(y) move_down(y) yield end
# File lib/prawn/document.rb, line 227 def page state.page end
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 state.page_count end
Provides a way to execute a block of code repeatedly based on a page_filter.
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
# File lib/prawn/document.rb, line 621 def page_match?(page_filter, page_number) case page_filter when :all true when :odd page_number % 2 == 1 when :even page_number % 2 == 0 when Range, Array page_filter.include?(page_number) when Proc page_filter.call(page_number) end end
Returns the innermost non-stretchy bounding box.
# File lib/prawn/document.rb, line 413 def reference_bounds @bounding_box.reference_bounds end
Renders the PDF document to string
# File lib/prawn/document.rb, line 358 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
Renders the PDF document to file.
pdf.render_file "foo.pdf"
# File lib/prawn/document.rb, line 375 def render_file(filename) Kernel.const_defined?("Encoding") ? mode = "wb:ASCII-8BIT" : mode = "wb" File.open(filename,mode) { |f| f << render } end
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
A list of all repeaters in the document. See #repeat for details
# File lib/prawn/repeater.rb, line 17 def repeaters @repeaters ||= [] end
Saves the current font, and then yields. When the block finishes, the original font is restored.
# File lib/prawn/font.rb, line 110 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
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 /2.0 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
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)
A template for a page can be specified by pointing to the path of and existing pdf. One can also specify which page of the template which defaults otherwise to 1.
pdf.start_new_page(:template => multipage_template.pdf, :template_page => 2)
Note: templates get indexed by either the object_id of the filename or stream entered so that if you reuse the same template multiple times be sure to use the same instance for more efficient use of resources and smaller rendered pdfs.
# File lib/prawn/document.rb, line 249 def start_new_page(options = {}) if last_page = state.page last_page_size = last_page.size last_page_layout = last_page.layout last_page_margins = last_page.margins end page_options = {:size => options[:size] || last_page_size, :layout => options[:layout] || last_page_layout, :margins => last_page_margins} if last_page new_graphic_state = last_page.graphic_state.dup #erase the color space so that it gets reset on new page for fussy pdf-readers new_graphic_state.color_space = {} page_options.merge!(:graphic_state => new_graphic_state) end merge_template_options(page_options, options) if options[:template] state.page = Prawn::Core::Page.new(self, page_options) apply_margin_options(options) generate_margin_box # Reset the bounding box if the new page has different size or layout if last_page && (last_page.size != state.page.size || last_page.layout != state.page.layout) @bounding_box = @margin_box end state.page.new_content_stream if options[:template] use_graphic_settings(options[:template]) unless options[:orphan] state.insert_page(state.page, @page_number) @page_number += 1 canvas { image(@background, :scale => @background_scale, :at => bounds.top_left) } if @background @y = @bounding_box.absolute_top float do state.on_page_create_action(self) end end end
# File lib/prawn/document.rb, line 223 def state @internal_state end
Set up and draw a table on this document. A block can be given, which will be run after cell setup but before layout and drawing.
See the documentation on Prawn::Table for details on the arguments.
# File lib/prawn/table.rb, line 25 def table(data, options={}, &block) t = Table.new(data, self, options, &block) t.draw t end
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 218 def width_of(string, options={}) if options[:inline_format] # Build up an Arranger with the entire string on one line, finalize it, # and find its width. arranger = Core::Text::Formatted::Arranger.new(self, options) arranger.consumed = Text::Formatted::Parser.to_array(string) arranger.finalize_line arranger.line_width else f = if options[:style] # override style with :style => :bold find_font(@font ? @font.name : 'Helvetica', :style => options[:style]) else font end f.compute_width_of(string, options) + (character_spacing * font.character_count(string)) end end
# File lib/prawn/document.rb, line 317 def y=(new_y) @y = new_y bounds.update_height end
# File lib/prawn/document.rb, line 687 def apply_margin_options(options) if options[:margin] # Treat :margin as CSS shorthand with 1-4 values. margin = Array(options[:margin]) positions = { 4 => [0,1,2,3], 3 => [0,1,2,1], 2 => [0,1,0,1], 1 => [0,0,0,0] }[margin.length] [:top, :right, :bottom, :left].zip(positions).each do |p,i| options[:"#{p}_margin"] ||= margin[i] end end [:left,:right,:top,:bottom].each do |side| if margin = options[:"#{side}_margin"] state.page.margins[side] = margin end end end
# File lib/prawn/document.rb, line 662 def generate_margin_box old_margin_box = @margin_box page = state.page @margin_box = BoundingBox.new( self, nil, # margin box has no parent [ page.margins[:left], page.dimensions[-1] - page.margins[:top] ] , :width => page.dimensions[-2] - (page.margins[:left] + page.margins[:right]), :height => page.dimensions[-1] - (page.margins[:top] + page.margins[:bottom]) ) # This check maintains indentation settings across page breaks if old_margin_box @margin_box.add_left_padding(old_margin_box.total_left_padding) @margin_box.add_right_padding(old_margin_box.total_right_padding) end # we must update bounding box if not flowing from the previous page # # FIXME: This may have a bug where the old margin is restored # when the bounding box exits. @bounding_box = @margin_box if old_margin_box == @bounding_box end
# File lib/prawn/document/bounding_box.rb, line 182 def init_bounding_box(user_block, options={}, &init_block) unless user_block raise ArgumentError, "bounding boxes require a block to be drawn within the box" end parent_box = @bounding_box init_block.call(parent_box) self.y = @bounding_box.absolute_top user_block.call unless options[:hold_position] || @bounding_box.stretchy? self.y = @bounding_box.absolute_bottom end created_box, @bounding_box = @bounding_box, parent_box return created_box end
# File lib/prawn/document/column_box.rb, line 31 def init_column_box(user_block, options={}, &init_block) parent_box = @bounding_box init_block.call(parent_box) self.y = @bounding_box.absolute_top user_block.call self.y = @bounding_box.absolute_bottom unless options[:hold_position] @bounding_box = parent_box end
# File lib/prawn/document.rb, line 646 def merge_template_options(page_options, options) object_id = state.store.import_page(options[:template], options[:template_page] || 1) page_options.merge!(:object_id => object_id, :page_template => true) end
# File lib/prawn/layout/grid.rb, line 255 def multi_box(b1, b2) MultiBox.new(self, b1, b2) end
# File lib/prawn/layout/grid.rb, line 251 def single_box(i, j) Box.new(self, i, j) end
setting override_settings to true ensures that a new graphic state does not end up using previous settings especially from imported template streams
# File lib/prawn/document.rb, line 653 def use_graphic_settings(override_settings = false) set_fill_color if current_fill_color != "000000" || override_settings set_stroke_color if current_stroke_color != "000000" || override_settings write_line_width if line_width != 1 || override_settings write_stroke_cap_style if cap_style != :butt || override_settings write_stroke_join_style if join_style != :miter || override_settings write_stroke_dash if dashed? || override_settings end