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'
CONTENT_CONTAINER_MIDDLE =

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

"Q\nq"
CONTENT_CONTAINER_END =

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

'Q'

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 51

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 581

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 = self.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]
			v = v[:referenced_object] = v[:referenced_object].dup if v.is_a?(Hash) && v[:referenced_object]
		end
	end
	return page_copy.instance_exec(secure || @secure_injection) { |s| secure_for_copy if s ; init_contents; 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 112

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 107

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 351

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

#fit_text(text, font, length, height = 10000000) ⇒ 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 362

def fit_text(text, font, length, height = 10000000)
	size = 100000
	size_array = [size]
	metrics = Fonts.dimensions_of text, font, size
	if metrics[0] > length
		size_array << size * length/metrics[0]
	end
	if metrics[1] > height
		size_array << size * height/metrics[1]
	end
	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”.

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 384

def fix_rotation
	return self if self[:Rotate].to_f == 0.0 || mediabox.nil?
	# calculate the rotation
	r = 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)%2) != 0
		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
	self.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 54

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)

	# injecting each of the values in the injected Page
	res = resources
	obj.resources.each do |key, new_val|
		unless PDF::PRIVATE_HASH_KEYS.include? key # keep CombinePDF structual data intact.
			if res[key].nil?
				res[key] = new_val
			elsif res[key].is_a?(Hash) && new_val.is_a?(Hash)
				new_val = new_val[:referenced_object] || new_val
				new_val.update (res[key][:referenced_object] || res[key]) # make sure the old values are respected
				(res[key][:referenced_object] || res[key]).update new_val # transfer old and new values to the injected page
			end #Do nothing if array - ot is the PROC array, which is an issue
		end
	end
	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 35

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 101

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 96

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 orientation

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 469

def orientation force = nil, clockwise = true
	a = page_size
	unless force
		return (a[2] - a[0] > a[3] - a[1]) ? :landscape : :portrait
	end
	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 117

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 419

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).to_s} 0 0 #{y_ratio.round(4).to_s} #{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).to_s} 0 0 #{y_ratio.round(4).to_s} #{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 122

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 455

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 445

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 450

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 25

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 30

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 potin 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 BUTTOM 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”, “:buttom”

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

a Fixnum 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)



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# File 'lib/combine_pdf/page_methods.rb', line 165

def textbox(text, properties = {})
	options = {
		x: 0,
		y: 0,
		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], box_graphic_state[:LJ] =  2, 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"

		if options[:box_color]
			box_stream << "#{options[:box_color].join(' ')} rg\n"
		end
		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" 
		## buttom and right corner - first line and first corner
		box_stream << "#{options[:x] + options[:width] - radius} #{options[:y]} l\n" #buttom
		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 buttom-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 buttom 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 = self.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 506

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