Module: CombinePDF::Page_Methods

Includes:
Renderer
Included in:
PDFWriter
Defined in:
lib/combine_pdf/page_methods.rb

Overview

This module injects page editing methods into existing page objects and the PDFWriter objects.

Constant Summary collapse

CONTENT_CONTAINER_START =

holds the string that starts a PDF graphic state container - used for wrapping malformed PDF content streams.

'q'.freeze
CONTENT_CONTAINER_MIDDLE =

holds the string that ends a PDF graphic state container - used for wrapping malformed PDF content streams.

"Q\nq".freeze
CONTENT_CONTAINER_END =

holds the string that ends a PDF graphic state container - used for wrapping malformed PDF content streams.

'Q'.freeze

Instance Method Summary collapse

Instance Method Details

#<<(obj) ⇒ Object

the injection method



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# File 'lib/combine_pdf/page_methods.rb', line 48

def <<(obj)
  inject_page obj, true
end

#>>(obj) ⇒ Object 



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# File 'lib/combine_pdf/page_methods.rb', line 52

def >>(obj)
  inject_page obj, false
end

#copy(secure = false) ⇒ Object

creates a copy of the page. if the :secure flag is set to true, the resource indentifiers (fonts etc’) will be renamed in order to secure their uniqueness.



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# File 'lib/combine_pdf/page_methods.rb', line 635

def copy(secure = false)
  # since only the Content streams are modified (Resource hashes are created anew),
  # it should be safe (and a lot faster) to create a deep copy only for the content hashes and streams.
  delete :Parent
  prep_content_array
  page_copy = clone
  page_copy[:Contents] = page_copy[:Contents].map do |obj|
    obj = obj.dup
    obj[:referenced_object] = obj[:referenced_object].dup if obj[:referenced_object]
    obj[:referenced_object][:raw_stream_content] = obj[:referenced_object][:raw_stream_content].dup if obj[:referenced_object] && obj[:referenced_object][:raw_stream_content]
    obj
  end
  if page_copy[:Resources]
    page_res = page_copy[:Resources] = page_copy[:Resources].dup
    page_res = page_copy[:Resources][:referenced_object] = page_copy[:Resources][:referenced_object].dup if page_copy[:Resources][:referenced_object]
    page_res.each do |k, v|
      v = page_res[k] = v.dup if v.is_a?(Array) || v.is_a?(Hash)
      v = v[:referenced_object] = v[:referenced_object].dup if v.is_a?(Hash) && v[:referenced_object]
    end
  end
  page_copy.instance_exec(secure || @secure_injection) { |s| secure_for_copy if s; init_contents; self }
end

#crop(new_size = nil) ⇒ Object

crops the page using a relative size.

‘crop` will crop the page by updating it’s MediaBox property using a relative crop box. i.e., when cropping a page with #page_size of [10,10,900,900] to [5,5,500,500], the resulting page size should be [15, 15, 510, 510] - allowing you to ignore a page’s initial XY starting point when cropping.

for an absolute cropping, simpy use the #mediabox= or #cropbox= methods, setting their value to the new #page_size.

accepts:

new_size

an Array with four elements: [X0, Y0, X_max, Y_max]. For example, inch4(width)x6(length): ‘[200, 200, 488, 632]`

Raises:

  • (TypeError) 


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# File 'lib/combine_pdf/page_methods.rb', line 473

def crop(new_size = nil)
  # no crop box? clear any cropping.
  return page_size unless new_size
  # type safety
  raise TypeError, "pdf.page\#crop expeceted an Array (or nil)" unless Array === new_size

  # set the MediaBox to the existing page size
  self[:MediaBox] = page_size
  # clear the CropBox
  self[:CropBox] = nil
  # update X0
  self[:MediaBox][0] += new_size[0]
  # update Y0
  self[:MediaBox][1] += new_size[1]
  # update X max IF the value is smaller then the existing value
  self[:MediaBox][2] = (self[:MediaBox][0] + new_size[2] - new_size[0]) if (self[:MediaBox][0] + new_size[2] - new_size[0])  < self[:MediaBox][2]
  # update Y max IF the value is smaller then the existing value
  self[:MediaBox][3] = (self[:MediaBox][1] + new_size[3] - new_size[1]) if (self[:MediaBox][1] + new_size[3] - new_size[1])  < self[:MediaBox][3]
  # return self for chaining
  self
end

#cropbox ⇒ Object

accessor (getter) for the :CropBox element of the page



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# File 'lib/combine_pdf/page_methods.rb', line 134

def cropbox
  actual_object self[:CropBox]
end

#cropbox=(dimensions = [0.0, 0.0, 612.0, 792.0]) ⇒ Object

accessor (setter) for the :CropBox element of the page

dimensions

an Array consisting of four numbers (can be floats) setting the size of the media box.



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# File 'lib/combine_pdf/page_methods.rb', line 129

def cropbox=(dimensions = [0.0, 0.0, 612.0, 792.0])
  self[:CropBox] = dimensions
end

#dimensions_of(text, fonts, size = 1000) ⇒ Object

gets the dimentions (width and height) of the text, as it will be printed in the PDF.

text

the text to measure

font

a font name or an Array of font names. Font names should be registered fonts. The 14 standard fonts are pre regitered with the font library.

size

the size of the font (defaults to 1000 points).



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# File 'lib/combine_pdf/page_methods.rb', line 373

def dimensions_of(text, fonts, size = 1000)
  Fonts.dimensions_of text, fonts, size
end

#fit_text(text, font, length, height = 10_000_000) ⇒ Object

this method returns the size for which the text fits the requested metrices the size is type Float and is rather exact if the text cannot fit such a small place, returns zero (0). maximum font size possible is set to 100,000 - which should be big enough for anything

text

the text to fit

font

the font name. @see font

length

the length to fit

height

the height to fit (optional - normally length is the issue)



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# File 'lib/combine_pdf/page_methods.rb', line 385

def fit_text(text, font, length, height = 10_000_000)
  size = 100_000
  size_array = [size]
  metrics = Fonts.dimensions_of text, font, size
  size_array << size * length / metrics[0] if metrics[0] > length
  size_array << size * height / metrics[1] if metrics[1] > height
  size_array.min
end

#fix_rotation ⇒ Object

This method moves the Page property into the page’s data stream, so that “what you see is what you get”.

After using thie method, #orientation should return the absolute orientation rather than only the data’s orientation (unless ‘:Rotate` is changed).

This is usful in cases where there might be less control over the source PDF files, and the user assums that the PDF page’s data is the same as the PDF’s pages on screen display (Rotate rotates a page but leaves the data in the original orientation).

The method returns the page object, thus allowing method chaining (i.e. ‘page = 90; page.textbox(’hello!‘).fix_rotation.textbox(’hello!‘)`)



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# File 'lib/combine_pdf/page_methods.rb', line 404

def fix_rotation
  return self if self[:Rotate].to_f == 0.0 || mediabox.nil?
  # calculate the rotation
  r = (360.0 - self[:Rotate].to_f) * Math::PI / 180
  s = Math.sin(r).round 6
  c = Math.cos(r).round 6
  ctm = [c, s, -s, c]
  # calculate the translation (move the origin of x,y to the new origin).
  x = mediabox[2] - mediabox[0]
  y = mediabox[3] - mediabox[1]
  ctm.push(((x * c).abs - x * c + (y * s).abs + y * s) / 2, ((x * s).abs - x * s + (y * c).abs - y * c) / 2)

  # insert the rotation stream into the current content stream
  insert_content "q\n#{ctm.join ' '} cm\n", 0
  # close the rotation stream
  insert_content CONTENT_CONTAINER_END
  # reset the mediabox and cropbox values - THIS IS ONLY FOR ORIENTATION CHANGE...
  if (self[:Rotate].to_f / 90).to_i.odd?
    self[:MediaBox] = self[:MediaBox].values_at(1, 0, 3, 2)
    self[:CropBox] = self[:CropBox].values_at(1, 0, 3, 2) if self[:CropBox]
  end
  # reset the Rotate property
  delete :Rotate
  # disconnect the content stream, so that future inserts aren't rotated
  @contents = false # init_contents

  # always return self, for chaining.
  self
end

#inject_page(obj, top = true) ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/combine_pdf/page_methods.rb', line 56

def inject_page(obj, top = true)
  raise TypeError, "couldn't inject data, expecting a PDF page (Hash type)" unless obj.is_a?(Page_Methods)

  obj = obj.copy(should_secure?(obj)) # obj.copy(secure_injection)

  # following the reference chain and assigning a pointer to the correct Resouces object.
  # (assignments of Strings, Arrays and Hashes are pointers in Ruby, unless the .dup method is called)

  # setup references to avoid method calls.
  local_res = resources
  local_val = nil
  # # setup references to avoid method calls.
  # remote_res = obj.resources
  # remote_val = nil

  # add each of the new resources in the uncoming Page to the local resource Hash
  obj.resources.each do |key, new_val|
    # keep CombinePDF structural data intact.
    next if PDF::PRIVATE_HASH_KEYS.include?(key)
    # review
    if local_res[key].nil?
      # no local data, adopt data from incoming page
      local_res[key] = new_val
      # go back to looping, no need to parse the rest of the Ruby
      next
    elsif (local_val = actual_object(local_res[key])).is_a?(Hash) && (new_val = actual_object(new_val)).is_a?(Hash)
      # marge data with priority to the incoming page's data
      new_val.update local_val # make sure the old values are respected
      local_val.update new_val # transfer old and new values to the injected page
    end # Do nothing if array or anything else
  end

  # concat the Annots array? (what good are named links if the names are in the unaccessible Page Catalog?)
  # if obj[:Annots]
  #   if (local_val = actual_object(self[:Annots])).nil?
  #     self[:Annots] = obj[:Annots]
  #   elsif local_val.is_a?(Array) && (remote_val = actual_object(obj[:Annots])).is_a?(Array)
  #     local_val.concat remote_val
  #   end
  # end

  # set ProcSet to recommended value
  resources[:ProcSet] ||= [:PDF, :Text, :ImageB, :ImageC, :ImageI] # this was recommended by the ISO. 32000-1:2008

  if top # if this is a stamp (overlay)
    insert_content CONTENT_CONTAINER_START, 0
    insert_content CONTENT_CONTAINER_MIDDLE
    self[:Contents].concat obj[:Contents]
    insert_content CONTENT_CONTAINER_END
  else # if this was a watermark (underlay? would be lost if the page was scanned, as white might not be transparent)
    insert_content CONTENT_CONTAINER_MIDDLE, 0
    insert_content CONTENT_CONTAINER_START, 0
    self[:Contents].insert 1, *obj[:Contents]
    insert_content CONTENT_CONTAINER_END
  end
  init_contents

  self
end

#make_secure ⇒ Object

sets secure_injection to ‘true` and returns self, allowing for chaining methods



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# File 'lib/combine_pdf/page_methods.rb', line 34

def make_secure
  warn "**Deprecation Warning**: the `Page_Methods#secure_injection`, `Page_Methods#make_unsecure` and `Page_Methods#make_secure` methods are deprecated. Use `Page_Methods#copy(true)` for safeguarding against font/resource conflicts when 'stamping' one PDF page over another."
  @secure_injection = true
  self
end

#make_unsecure ⇒ Object

sets secure_injection to ‘false` and returns self, allowing for chaining methods



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# File 'lib/combine_pdf/page_methods.rb', line 41

def make_unsecure
  warn "**Deprecation Warning**: the `Page_Methods#secure_injection`, `Page_Methods#make_unsecure` and `Page_Methods#make_secure` methods are deprecated. Use `Page_Methods#copy(true)` for safeguarding against font/resource conflicts when 'stamping' one PDF page over another."
  @secure_injection = false
  self
end

#mediabox ⇒ Object

accessor (getter) for the :MediaBox element of the page



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# File 'lib/combine_pdf/page_methods.rb', line 123

def mediabox
  actual_object self[:MediaBox]
end

#mediabox=(dimensions = [0.0, 0.0, 612.0, 792.0]) ⇒ Object

accessor (setter) for the :MediaBox element of the page

dimensions

an Array consisting of four numbers (can be floats) setting the size of the media box.



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# File 'lib/combine_pdf/page_methods.rb', line 118

def mediabox=(dimensions = [0.0, 0.0, 612.0, 792.0])
  self[:MediaBox] = dimensions
end

#orientation(force = nil, clockwise = true) ⇒ Object

get or set (by clockwise rotation) the page’s data orientation.

note that the data’s orientation is the way data is oriented on the page. The display orientati0n (which might different) is controlled by the ‘:Rotate` property. see #fix_orientation for more details.

accepts one optional parameter:

force

to get the orientation, pass nil. to set the orientatiom, set fource to either :portrait or :landscape. defaults to nil (get orientation).

clockwise

sets the rotation directions. defaults to true (clockwise rotation).

returns the current orientation (:portrait or :landscape) if used to get the orientation. otherwise, if used to set the orientation, returns the page object to allow method chaining.

  • Notice: a square page always returns the :portrait value and is ignored when trying to set the orientation.



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# File 'lib/combine_pdf/page_methods.rb', line 526

def orientation(force = nil, clockwise = true)
  a = page_size
  return (a[2] - a[0] > a[3] - a[1]) ? :landscape : :portrait unless force
  unless orientation == force || (a[2] - a[0] == a[3] - a[1])
    self[:Rotate] = 0
    clockwise ? rotate_right : rotate_left
  end
  self
end

#page_size ⇒ Object

get page size



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# File 'lib/combine_pdf/page_methods.rb', line 139

def page_size
  cropbox || mediabox
end

#resize(new_size = nil, conserve_aspect_ratio = true) ⇒ Object

resizes the page relative to it’s current viewport (either the cropbox or the mediabox), setting the new viewport to the requested size.

accepts:

new_size

an Array with four elements: [X0, Y0, X_max, Y_max]. For example, A4: ‘[0, 0, 595, 842]`. It is important that the first two numbers are 0 unless a special effect is attempted. If the first two numbers change, the final result might not be the size requested, but the nearest possible transformation (calling the method again will allow a better resizing).

conserve_aspect_ratio

whether to keep the current content in the same aspect ratio or to allow streaching. Defaults to true - so that although the content is resized, it might not fill the new size completely.



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# File 'lib/combine_pdf/page_methods.rb', line 439

def resize(new_size = nil, conserve_aspect_ratio = true)
  return page_size unless new_size
  c_mediabox = mediabox
  c_cropbox = cropbox
  c_size = c_cropbox || c_mediabox
  x_ratio = 1.0 * (new_size[2] - new_size[0]) / (c_size[2]) #-c_size[0])
  y_ratio = 1.0 * (new_size[3] - new_size[1]) / (c_size[3]) #-c_size[1])
  x_move = new_size[0] - c_size[0]
  y_move = new_size[1] - c_size[1]
  # puts "ctm will be: #{x_ratio.round(4)} 0 0 #{y_ratio.round(4)} #{x_move} #{y_move}"
  self[:MediaBox] = [(c_mediabox[0] + x_move), (c_mediabox[1] + y_move), ((c_mediabox[2] * x_ratio) + x_move), ((c_mediabox[3] * y_ratio) + y_move)]
  self[:CropBox] = [(c_cropbox[0] + x_move), (c_cropbox[1] + y_move), ((c_cropbox[2] * x_ratio) + x_move), ((c_cropbox[3] * y_ratio) + y_move)] if c_cropbox
  x_ratio = y_ratio = [x_ratio, y_ratio].min if conserve_aspect_ratio
  # insert the rotation stream into the current content stream
  # insert_content "q\n#{x_ratio.round(4).to_s} 0 0 #{y_ratio.round(4).to_s} 0 0 cm\n1 0 0 1 #{x_move} #{y_move} cm\n", 0
  insert_content "q\n#{x_ratio.round(4)} 0 0 #{y_ratio.round(4)} #{x_move} #{y_move} cm\n", 0
  # close the rotation stream
  insert_content CONTENT_CONTAINER_END
  # disconnect the content stream, so that future inserts aren't rotated
  @contents = false # init_contents

  # always return self, for chaining.
  self
end

#resources ⇒ Object

accessor (getter) for the :Resources element of the page



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# File 'lib/combine_pdf/page_methods.rb', line 144

def resources
  self[:Resources] ||= {}
  self[:Resources][:referenced_object] || self[:Resources]
end

#rotate_180 ⇒ Object

rotate the page by 180 degrees



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# File 'lib/combine_pdf/page_methods.rb', line 508

def rotate_180
  self[:Rotate] = (self[:Rotate].to_f() + 180)
  fix_rotation
end

#rotate_left ⇒ Object

rotate the page 90 degrees counter clockwise



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# File 'lib/combine_pdf/page_methods.rb', line 496

def rotate_left
  self[:Rotate] = (self[:Rotate].to_f() + 90)
  fix_rotation
end

#rotate_right ⇒ Object

rotate the page 90 degrees clockwise



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# File 'lib/combine_pdf/page_methods.rb', line 502

def rotate_right
  self[:Rotate] = (self[:Rotate].to_f() - 90)
  fix_rotation
end

#secure_injection ⇒ Object

accessor (getter) for the secure_injection setting



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# File 'lib/combine_pdf/page_methods.rb', line 22

def secure_injection
  warn "**Deprecation Warning**: the `Page_Methods#secure_injection`, `Page_Methods#make_unsecure` and `Page_Methods#make_secure` methods are deprecated. Use `Page_Methods#copy(true)` for safeguarding against font/resource conflicts when 'stamping' one PDF page over another."
  @secure_injection
end

#secure_injection=(safe) ⇒ Object

accessor (setter) for the secure_injection setting



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# File 'lib/combine_pdf/page_methods.rb', line 28

def secure_injection=(safe)
  warn "**Deprecation Warning**: the `Page_Methods#secure_injection`, `Page_Methods#make_unsecure` and `Page_Methods#make_secure` methods are deprecated. Use `Page_Methods#copy(true)` for safeguarding against font/resource conflicts when 'stamping' one PDF page over another."
  @secure_injection = safe
end

#textbox(text, properties = {}) ⇒ Object

This method adds a simple text box to the Page represented by the PDFWriter class. This function takes two values:

text

the text to write in the box.

properties

a Hash of box properties.

the symbols and values in the properties Hash could be any or all of the following:

x

the left position of the box.

y

the BOTTOM position of the box.

width

the width/length of the box. negative values will be computed from edge of page. defaults to 0 (end of page).

height

the height of the box. negative values will be computed from edge of page. defaults to 0 (end of page).

text_align

symbol for horizontal text alignment, can be “:center” (default), “:right”, “:left”

text_valign

symbol for vertical text alignment, can be “:center” (default), “:top”, “:bottom”

text_padding

a Float between 0 and 1, setting the padding for the text. defaults to 0.05 (5%).

font

a registered font name or an Array of names. defaults to “:Helvetica”. The 14 standard fonts names are:

  • :“Times-Roman”

  • :“Times-Bold”

  • :“Times-Italic”

  • :“Times-BoldItalic”

  • :Helvetica

  • :“Helvetica-Bold”

  • :“Helvetica-BoldOblique”

  • :“Helvetica- Oblique”

  • :Courier

  • :“Courier-Bold”

  • :“Courier-Oblique”

  • :“Courier-BoldOblique”

  • :Symbol

  • :ZapfDingbats

font_size

an Integer for the font size, or :fit_text to fit the text in the box. defaults to “:fit_text”

max_font_size

if font_size is set to :fit_text, this will be the maximum font size. defaults to nil (no maximum)

font_color

text color in [R, G, B], an array with three floats, each in a value between 0 to 1 (gray will be “[0.5, 0.5, 0.5]”). defaults to black.

stroke_color

text stroke color in [R, G, B], an array with three floats, each in a value between 0 to 1 (gray will be “[0.5, 0.5, 0.5]”). defounlts to nil (no stroke).

stroke_width

text stroke width in PDF units. defaults to 0 (none).

box_color

box fill color in [R, G, B], an array with three floats, each in a value between 0 to 1 (gray will be “[0.5, 0.5, 0.5]”). defaults to nil (none).

border_color

box border color in [R, G, B], an array with three floats, each in a value between 0 to 1 (gray will be “[0.5, 0.5, 0.5]”). defaults to nil (none).

border_width

border width in PDF units. defaults to nil (none).

box_radius

border radius in PDF units. defaults to 0 (no corner rounding).

opacity

textbox opacity, a float between 0 (transparent) and 1 (opaque)

ctm

A PDF complient CTM data array that will manipulate the axis and allow transformations. i.e. ‘[1,0,0,1,0,0]`



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# File 'lib/combine_pdf/page_methods.rb', line 187

def textbox(text, properties = {})
  options = {
    x: page_size[0],
    y: page_size[1],
    width: 0,
    height: -1,
    text_align: :center,
    text_valign: :center,
    text_padding: 0.1,
    font: nil,
    font_size: :fit_text,
    max_font_size: nil,
    font_color: [0, 0, 0],
    stroke_color: nil,
    stroke_width: 0,
    box_color: nil,
    border_color: nil,
    border_width: 0,
    box_radius: 0,
    opacity: 1,
    ctm: nil # ~= [1,0,0,1,0,0]
  }
  options.update properties
  # reset the length and height to meaningful values, if negative
  options[:width] = mediabox[2] - options[:x] + options[:width] if options[:width] <= 0
  options[:height] = mediabox[3] - options[:y] + options[:height] if options[:height] <= 0

  # reset the padding value
  options[:text_padding] = 0 if options[:text_padding].to_f >= 1

  # create box stream
  box_stream = +''
  # set graphic state for box
  if options[:box_color] || (options[:border_width].to_i > 0 && options[:border_color])
    # compute x and y position for text
    x = options[:x]
    y = options[:y]

    # set graphic state for the box
    box_stream << "q\n"
    box_stream << "#{options[:ctm].join ' '} cm\n" if options[:ctm]
    box_graphic_state = { ca: options[:opacity], CA: options[:opacity], LW: options[:border_width], LC: 0, LJ: 0, LD: 0 }
    if options[:box_radius] != 0 # if the text box has rounded corners
      box_graphic_state[:LC] = 2
      box_graphic_state[:LJ] = 1
    end
    box_graphic_state = graphic_state box_graphic_state # adds the graphic state to Resources and gets the reference
    box_stream << "#{object_to_pdf box_graphic_state} gs\n"

    # the following line was removed for Acrobat Reader compatability
    # box_stream << "DeviceRGB CS\nDeviceRGB cs\n"

    box_stream << "#{options[:box_color].join(' ')} rg\n" if options[:box_color]
    if options[:border_width].to_i > 0 && options[:border_color]
      box_stream << "#{options[:border_color].join(' ')} RG\n"
    end
    # create the path
    radius = options[:box_radius]
    half_radius = (radius.to_f / 2).round 4
    ## set starting point
    box_stream << "#{options[:x] + radius} #{options[:y]} m\n"
    ## bottom and right corner - first line and first corner
    box_stream << "#{options[:x] + options[:width] - radius} #{options[:y]} l\n" # bottom
    if options[:box_radius] != 0 # make first corner, if not straight.
      box_stream << "#{options[:x] + options[:width] - half_radius} #{options[:y]} "
      box_stream << "#{options[:x] + options[:width]} #{options[:y] + half_radius} "
      box_stream << "#{options[:x] + options[:width]} #{options[:y] + radius} c\n"
    end
    ## right and top-right corner
    box_stream << "#{options[:x] + options[:width]} #{options[:y] + options[:height] - radius} l\n"
    if options[:box_radius] != 0
      box_stream << "#{options[:x] + options[:width]} #{options[:y] + options[:height] - half_radius} "
      box_stream << "#{options[:x] + options[:width] - half_radius} #{options[:y] + options[:height]} "
      box_stream << "#{options[:x] + options[:width] - radius} #{options[:y] + options[:height]} c\n"
    end
    ## top and top-left corner
    box_stream << "#{options[:x] + radius} #{options[:y] + options[:height]} l\n"
    if options[:box_radius] != 0
      box_stream << "#{options[:x] + half_radius} #{options[:y] + options[:height]} "
      box_stream << "#{options[:x]} #{options[:y] + options[:height] - half_radius} "
      box_stream << "#{options[:x]} #{options[:y] + options[:height] - radius} c\n"
    end
    ## left and bottom-left corner
    box_stream << "#{options[:x]} #{options[:y] + radius} l\n"
    if options[:box_radius] != 0
      box_stream << "#{options[:x]} #{options[:y] + half_radius} "
      box_stream << "#{options[:x] + half_radius} #{options[:y]} "
      box_stream << "#{options[:x] + radius} #{options[:y]} c\n"
    end
    # fill / stroke path
    box_stream << "h\n"
    if options[:box_color] && options[:border_width].to_i > 0 && options[:border_color]
      box_stream << "B\n"
    elsif options[:box_color] # fill if fill color is set
      box_stream << "f\n"
    elsif options[:border_width].to_i > 0 && options[:border_color] # stroke if border is set
      box_stream << "S\n"
    end

    # exit graphic state for the box
    box_stream << "Q\n"
  end
  contents << box_stream

  # reset x,y by text alignment - x,y are calculated from the bottom left
  # each unit (1) is 1/72 Inch
  # create text stream
  text_stream = +''
  if !text.to_s.empty? && options[:font_size] != 0 && (options[:font_color] || options[:stroke_color])
    # compute x and y position for text
    x = options[:x] + (options[:width] * options[:text_padding])
    y = options[:y] + (options[:height] * options[:text_padding])

    # set the fonts (fonts array, with :Helvetica as fallback).
    fonts = [*options[:font], :Helvetica]
    # fit text in box, if requested
    font_size = options[:font_size]
    if options[:font_size] == :fit_text
      font_size = fit_text text, fonts, (options[:width] * (1 - options[:text_padding])), (options[:height] * (1 - options[:text_padding]))
      font_size = options[:max_font_size] if options[:max_font_size] && font_size > options[:max_font_size]
    end

    text_size = dimensions_of text, fonts, font_size

    if options[:text_align] == :center
      x = ((options[:width] * (1 - (2 * options[:text_padding]))) - text_size[0]) / 2 + x
    elsif options[:text_align] == :right
      x = ((options[:width] * (1 - (1.5 * options[:text_padding]))) - text_size[0]) + x
    end
    if options[:text_valign] == :center
      y = ((options[:height] * (1 - (2 * options[:text_padding]))) - text_size[1]) / 2 + y
    elsif options[:text_valign] == :top
      y = (options[:height] * (1 - (1.5 * options[:text_padding]))) - text_size[1] + y
    end

    # set graphic state for text
    text_stream << "q\n"
    text_stream << "#{options[:ctm].join ' '} cm\n" if options[:ctm]
    text_graphic_state = graphic_state(ca: options[:opacity], CA: options[:opacity], LW: options[:stroke_width].to_f, LC: 2, LJ: 1, LD: 0)
    text_stream << "#{object_to_pdf text_graphic_state} gs\n"

    # the following line was removed for Acrobat Reader compatability
    # text_stream << "DeviceRGB CS\nDeviceRGB cs\n"

    # set text render mode
    if options[:font_color]
      text_stream << "#{options[:font_color].join(' ')} rg\n"
    end
    if options[:stroke_width].to_i > 0 && options[:stroke_color]
      text_stream << "#{options[:stroke_color].join(' ')} RG\n"
      if options[:font_color]
        text_stream << "2 Tr\n"
      else
        final_stream << "1 Tr\n"
      end
    elsif options[:font_color]
      text_stream << "0 Tr\n"
    else
      text_stream << "3 Tr\n"
    end
    # format text object(s)
    # text_stream << "#{options[:font_color].join(' ')} rg\n" # sets the color state
    encode_text(text, fonts).each do |encoded|
      text_stream << "BT\n" # the Begine Text marker
      text_stream << format_name_to_pdf(set_font(encoded[0])) # Set font name
      text_stream << " #{font_size.round 3} Tf\n" # set font size and add font operator
      text_stream << "#{x.round 4} #{y.round 4} Td\n" # set location for text object
      text_stream << (encoded[1]) # insert the encoded string to the stream
      text_stream << " Tj\n" # the Text object operator and the End Text marker
      text_stream << "ET\n" # the Text object operator and the End Text marker
      x += encoded[2] / 1000 * font_size # update text starting point
      y -= encoded[3] / 1000 * font_size # update text starting point
    end
    # exit graphic state for text
    text_stream << "Q\n"
  end
  contents << text_stream

  self
end

#write_table(options = {}) ⇒ Object

Writes a table to the current page, removing(!) the written rows from the table_data Array.

since the table_data Array is updated, it is possible to call this method a few times, each time creating or moving to the next page, until table_data.empty? returns true.

accepts a Hash with any of the following keys as well as any of the PDFWriter#textbox options:

headers

an Array of strings with the headers (will be repeated every page).

table_data

as Array of Arrays, each containing a string for each column. the first row sets the number of columns. extra columns will be ignored.

font

a registered or standard font name (see PDFWriter). defaults to nil (:Helvetica).

header_font

a registered or standard font name for the headers (see PDFWriter). defaults to nil (the font for all the table rows).

max_font_size

the maximum font size. if the string doesn’t fit, it will be resized. defaults to 14.

column_widths

an array of relative column widths ([1,2] will display only the first two columns, the second twice as big as the first). defaults to nil (even widths).

header_color

the header color. defaults to [0.8, 0.8, 0.8] (light gray).

main_color

main row color. defaults to nil (transparent / white).

alternate_color

alternate row color. defaults to [0.95, 0.95, 0.95] (very light gray).

font_color

font color. defaults to [0,0,0] (black).

border_color

border color. defaults to [0,0,0] (black).

border_width

border width in PDF units. defaults to 1.

header_align

the header text alignment within each column (:right, :left, :center). defaults to :center.

row_align

the row text alignment within each column. defaults to :left (:right for RTL table).

direction

the table’s writing direction (:ltr or :rtl). this reffers to the direction of the columns and doesn’t effect text (rtl text is automatically recognized). defaults to :ltr.

max_rows

the maximum number of rows to actually draw, INCLUDING the header row. deafults to 25.

xy

an Array specifying the top-left corner of the table. defaulte to [page_width*0.1, page_height*0.9].

size

an Array specifying the height and the width of the table. defaulte to [page_width*0.8, page_height*0.8].



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# File 'lib/combine_pdf/page_methods.rb', line 560

def write_table(options = {})
  defaults = {
    headers: nil,
    table_data: [[]],
    font: nil,
    header_font: nil,
    max_font_size: 14,
    column_widths: nil,
    header_color: [0.8, 0.8, 0.8],
    main_color: nil,
    alternate_color: [0.95, 0.95, 0.95],
    font_color: [0, 0, 0],
    border_color: [0, 0, 0],
    border_width: 1,
    header_align: :center,
    row_align: nil,
    direction: :ltr,
    max_rows: 25,
    xy: nil,
    size: nil
  }
  options = defaults.merge options
  raise 'method call error! not enough rows allowed to create table' if (options[:max_rows].to_i < 1 && options[:headers]) || (options[:max_rows].to_i <= 0)
  options[:header_font] ||= options[:font]
  options[:row_align] ||= ((options[:direction] == :rtl) ? :right : :left)
  options[:xy] ||= [((page_size[2] - page_size[0]) * 0.1), ((page_size[3] - page_size[1]) * 0.9)]
  options[:size] ||= [((page_size[2] - page_size[0]) * 0.8), ((page_size[3] - page_size[1]) * 0.8)]
  # assert table_data is an array of arrays
  return false unless (options[:table_data].select { |r| !r.is_a?(Array) }).empty?
  # compute sizes
  top = options[:xy][1]
  height = options[:size][1] / options[:max_rows]
  from_side = options[:xy][0]
  width = options[:size][0]
  columns = options[:table_data][0].length
  column_widths = []
  columns.times { |_i| column_widths << (width / columns) }
  if options[:column_widths]
    scale = 0
    options[:column_widths].each { |w| scale += w }
    column_widths = []
    options[:column_widths].each { |w| column_widths << (width * w / scale) }
  end
  column_widths = column_widths.reverse if options[:direction] == :rtl
  # set count and start writing the data
  row_number = 1

  until options[:table_data].empty? || row_number > options[:max_rows]
    # add headers
    if options[:headers] && row_number == 1
      x = from_side
      headers = options[:headers]
      headers = headers.reverse if options[:direction] == :rtl
      column_widths.each_index do |i|
        text = headers[i].to_s
        textbox text, { x: x, y: (top - (height * row_number)), width: column_widths[i], height: height, box_color: options[:header_color], text_align: options[:header_align] }.merge(options).merge(font: options[:header_font])
        x += column_widths[i]
      end
      row_number += 1
    end
    x = from_side
    row_data = options[:table_data].shift
    row_data = row_data.reverse if options[:direction] == :rtl
    column_widths.each_index do |i|
      text = row_data[i].to_s
      box_color = (options[:alternate_color] && ((row_number.odd? && options[:headers]) || row_number.even?)) ? options[:alternate_color] : options[:main_color]
      textbox text, { x: x, y: (top - (height * row_number)), width: column_widths[i], height: height, box_color: box_color, text_align: options[:row_align] }.merge(options)
      x += column_widths[i]
    end
    row_number += 1
  end
  self
end