Class: Origami::ContentStream

Inherits:
Stream
  • Object
show all
Defined in:
lib/origami/graphics/xobject.rb

Overview

A class representing a Stream containing the contents of a Page.

Constant Summary collapse

DEFAULT_SIZE = 
12
DEFAULT_FONT = 
:F1
DEFAULT_LEADING = 
20
DEFAULT_STROKE_COLOR = 
Graphics::Color::GrayScale.new(0.0)
DEFAULT_FILL_COLOR = 
Graphics::Color::GrayScale.new(1.0)
DEFAULT_LINECAP = 
Graphics::LineCapStyle::BUTT_CAP
DEFAULT_LINEJOIN = 
Graphics::LineJoinStyle::MITER_JOIN
DEFAULT_DASHPATTERN = 
Graphics::DashPattern.new([], 0)
DEFAULT_LINEWIDTH = 
1.0

Constants inherited from Stream

Stream::TOKENS

Constants included from StandardObject

StandardObject::DEFAULT_ATTRIBUTES

Constants included from Object

Object::TOKENS

Instance Attribute Summary collapse

Attributes inherited from Stream

#dictionary

Attributes included from Object

#file_offset, #generation, #no, #objstm_offset, #parent

Instance Method Summary collapse

Methods inherited from Stream

#[], #[]=, #data, #data=, #decode!, #each_key, #encode!, #method_missing, parse, #post_build, #rawdata, #rawdata=, #real_type, #set_predictor, #to_obfuscated_str, #to_s, #value

Methods included from StandardObject

#do_type_check, #has_field?, included, #pdf_version_required, #set_default_value, #set_default_values

Methods included from Object

#<=>, #copy, #indirect_parent, #is_indirect?, parse, #pdf, #pdf_version_required, #post_build, #reference, #set_indirect, #set_pdf, #size, skip_until_next_obj, #solve, #to_o, #to_s, #type, typeof, #xrefs

Constructor Details

#initialize(rawdata = "", dictionary = {}) ⇒ ContentStream

Returns a new instance of ContentStream.



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# File 'lib/origami/graphics/xobject.rb', line 46

def initialize(rawdata = "", dictionary = {})

  @instructions = nil
  @canvas = Graphics::DummyCanvas.new

  super(rawdata, dictionary)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Origami::Stream

Instance Attribute Details

#canvas ⇒ Object

Returns the value of attribute canvas.



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# File 'lib/origami/graphics/xobject.rb', line 44

def canvas
  @canvas
end

#instructions ⇒ Object (readonly)

Returns the value of attribute instructions.



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# File 'lib/origami/graphics/xobject.rb', line 43

def instructions
  @instructions
end

Instance Method Details

#draw_image(name, attr = {}) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 81

def draw_image(name, attr = {})
  load! if @instructions.nil?

  x, y = attr[:x], attr[:y]

  @instructions << PDF::Instruction.new('q')
  @instructions << PDF::Instruction.new('cm', 300, 0, 0, 300, x, y)
  @instructions << PDF::Instruction.new('Do', name)
  @instructions << PDF::Instruction.new('Q')
end

#draw_line(from, to, attr = {}) ⇒ Object

Draw a straight line from the point at coord from, to the point at coord to.



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# File 'lib/origami/graphics/xobject.rb', line 95

def draw_line(from, to, attr = {})
  draw_polygon([from, to], attr)
end

#draw_polygon(coords = [], attr = {}) ⇒ Object

Draw a polygon from a array of coordinates.



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# File 'lib/origami/graphics/xobject.rb', line 102

def draw_polygon(coords = [], attr = {})
  load! if @instructions.nil?

  stroke_color  = attr[:stroke_color] || DEFAULT_STROKE_COLOR
  fill_color    = attr[:fill_color] || DEFAULT_FILL_COLOR
  line_cap      = attr[:line_cap] || DEFAULT_LINECAP
  line_join     = attr[:line_join] || DEFAULT_LINEJOIN
  line_width    = attr[:line_width] || DEFAULT_LINEWIDTH
  dash_pattern  = attr[:dash] || DEFAULT_DASHPATTERN

  stroke        = attr[:stroke].nil? ? true : attr[:stroke]
  fill          = attr[:fill].nil? ? false : attr[:fill]

  stroke = true if fill == false and stroke == false 

  set_fill_color(fill_color) if fill
  set_stroke_color(stroke_color) if stroke
  set_line_width(line_width)
  set_line_cap(line_cap)
  set_line_join(line_join)
  set_dash_pattern(dash_pattern)
   
  if @canvas.gs.text_state.is_in_text_object?
    @instructions << PDF::Instruction.new('ET').render(@canvas)
  end

  unless coords.size < 1
    x,y = coords.slice!(0)
    @instructions << PDF::Instruction.new('m',x,y).render(@canvas)

    coords.each do |px,py|
      @instructions << PDF::Instruction.new('l',px,py).render(@canvas)
    end

    @instructions << (i =
      if stroke and not fill
        PDF::Instruction.new('s')
      elsif fill and not stroke
        PDF::Instruction.new('f')
      elsif fill and stroke
        PDF::Instruction.new('b')
      end
    )

    i.render(@canvas)
  end

  self
end

#draw_rectangle(x, y, width, height, attr = {}) ⇒ Object

Draw a rectangle at position (x,y) with defined width and height.



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# File 'lib/origami/graphics/xobject.rb', line 155

def draw_rectangle(x, y, width, height, attr = {})
  load! if @instructions.nil?

  stroke_color  = attr[:stroke_color] || DEFAULT_STROKE_COLOR
  fill_color    = attr[:fill_color] || DEFAULT_FILL_COLOR
  line_cap      = attr[:line_cap] || DEFAULT_LINECAP
  line_join     = attr[:line_join] || DEFAULT_LINEJOIN
  line_width    = attr[:line_width] || DEFAULT_LINEWIDTH
  dash_pattern  = attr[:dash] || DEFAULT_DASHPATTERN

  stroke        = attr[:stroke].nil? ? true : attr[:stroke]
  fill          = attr[:fill].nil? ? false : attr[:fill]

  stroke = true if fill == false and stroke == false 

  set_fill_color(fill_color) if fill
  set_stroke_color(stroke_color) if stroke
  set_line_width(line_width)
  set_line_cap(line_cap)
  set_line_join(line_join)
  set_dash_pattern(dash_pattern)

  if @canvas.gs.text_state.is_in_text_object?
    @instructions << PDF::Instruction.new('ET').render(@canvas)
  end

  @instructions << PDF::Instruction.new('re', x,y,width,height).render(@canvas)
  
  @instructions << (i =
    if stroke and not fill
      PDF::Instruction.new('S')
    elsif fill and not stroke
      PDF::Instruction.new('f')
    elsif fill and stroke
      PDF::Instruction.new('B')
    end
  )

  i.render(@canvas)
  
  self
end

#paint_shading(shade) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 242

def paint_shading(shade)
  load! if @instructions.nil?
  @instructions << PDF::Instruction.new('sh', shade).render(@canvas)

  self
end

#pre_build ⇒ Object

:nodoc:



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# File 'lib/origami/graphics/xobject.rb', line 64

def pre_build #:nodoc:
  load! if @instructions.nil?
  if @canvas.gs.text_state.is_in_text_object?
    @instructions << PDF::Instruction.new('ET').render(@canvas)
  end

  @data = @instructions.join
  
  super
end

#render(engine) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 54

def render(engine)
  load! if @instructions.nil?

  @instructions.each do |instruction|
    instruction.render(engine)
  end

  nil
end

#set_dash_pattern(pattern) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 379

def set_dash_pattern(pattern)
  load! if @instructions.nil?
  unless @canvas.gs.dash_pattern.eql? pattern
    @instructions << PDF::Instruction.new('d', pattern.array, pattern.phase).render(@canvas)
  end

  self
end

#set_fill_color(color) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 319

def set_fill_color(color)
  load! if @instructions.nil?
  
  @instructions << ( i =
    if (color.respond_to? :r and color.respond_to? :g and color.respond_to? :b) or (color.is_a?(::Array) and color.size == 3)
      r = (color.respond_to?(:r) ? color.r : color[0]).to_f / 255
      g = (color.respond_to?(:g) ? color.g : color[1]).to_f / 255
      b = (color.respond_to?(:b) ? color.b : color[2]).to_f / 255
      PDF::Instruction.new('rg', r, g, b) if @canvas.gs.nonstroking_color != [r,g,b]

    elsif (color.respond_to? :c and color.respond_to? :m and color.respond_to? :y and color.respond_to? :k) or (color.is_a?(::Array) and color.size == 4)
      c = (color.respond_to?(:c) ? color.c : color[0]).to_f
      m = (color.respond_to?(:m) ? color.m : color[1]).to_f
      y = (color.respond_to?(:y) ? color.y : color[2]).to_f
      k = (color.respond_to?(:k) ? color.k : color[3]).to_f
      PDF::Instruction.new('k', c, m, y, k) if @canvas.gs.nonstroking_color != [c,m,y,k]
      
    elsif color.respond_to?:g or (0.0..1.0) === color 
      g = color.respond_to?(:g) ? color.g : color
      PDF::Instruction.new('g', g) if @canvas.gs.nonstroking_color != [ g ]

    else
      raise TypeError, "Invalid color : #{color}"
    end
  )

  i.render(@canvas) if i
  self 
end

#set_line_cap(cap) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 397

def set_line_cap(cap)
  load! if @instructions.nil?
  if @canvas.gs.line_cap != cap
    @instructions << PDF::Instruction.new('J', cap).render(@canvas)
  end

  self
end

#set_line_join(join) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 406

def set_line_join(join)
  load! if @instructions.nil?
  if @canvas.gs.line_join != join
    @instructions << PDF::Instruction.new('j', join).render(@canvas)
  end

  self
end

#set_line_width(width) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 388

def set_line_width(width)
  load! if @instructions.nil?
  if @canvas.gs.line_width != width
    @instructions << PDF::Instruction.new('w', width).render(@canvas)
  end

  self
end

#set_stroke_color(color) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 349

def set_stroke_color(color)
  load! if @instructions.nil?
  
  @instructions << ( i =
    if (color.respond_to? :r and color.respond_to? :g and color.respond_to? :b) or (color.is_a?(::Array) and color.size == 3)
      r = (color.respond_to?(:r) ? color.r : color[0]).to_f / 255
      g = (color.respond_to?(:g) ? color.g : color[1]).to_f / 255
      b = (color.respond_to?(:b) ? color.b : color[2]).to_f / 255
      PDF::Instruction.new('RG', r, g, b) if @canvas.gs.stroking_color != [r,g,b]

    elsif (color.respond_to? :c and color.respond_to? :m and color.respond_to? :y and color.respond_to? :k) or (color.is_a?(::Array) and color.size == 4)
      c = (color.respond_to?(:c) ? color.c : color[0]).to_f
      m = (color.respond_to?(:m) ? color.m : color[1]).to_f
      y = (color.respond_to?(:y) ? color.y : color[2]).to_f
      k = (color.respond_to?(:k) ? color.k : color[3]).to_f
      PDF::Instruction.new('K', c, m, y, k) if @canvas.gs.stroking_color != [c,m,y,k]
      
    elsif color.respond_to?:g or (0.0..1.0) === color 
      g = color.respond_to?(:g) ? color.g : color
      PDF::Instruction.new('G', g) if @canvas.gs.stroking_color != [ g ]

    else
      raise TypeError, "Invalid color : #{color}"
    end
  )

  i.render(@canvas) if i
  self 
end

#set_text_char_spacing(char_spacing) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 310

def set_text_char_spacing(char_spacing)
  load! if @instructions.nil?
  if char_spacing != @canvas.gs.text_state.char_spacing
    @instructions << PDF::Instruction.new('Tc', char_spacing).render(@canvas)
  end

  self
end

#set_text_font(fontname, size) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 249

def set_text_font(fontname, size)
  load! if @instructions.nil?
  if fontname != @canvas.gs.text_state.font or size != @canvas.gs.text_state.font_size
    @instructions << PDF::Instruction.new('Tf', fontname, size).render(@canvas)
  end

  self
end

#set_text_leading(leading) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 265

def set_text_leading(leading)
  load! if @instructions.nil?
  if leading != @canvas.gs.text_state.leading
    @instructions << PDF::Instruction.new('TL', leading).render(@canvas)
  end

  self
end

#set_text_pos(tx, ty) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 258

def set_text_pos(tx,ty)
  load! if @instructions.nil?
  @instructions << PDF::Instruction.new('Td', tx, ty).render(@canvas)
  
  self
end

#set_text_rendering(rendering) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 274

def set_text_rendering(rendering)
  load! if @instructions.nil?
  if rendering != @canvas.gs.text_state.rendering_mode
    @instructions << PDF::Instruction.new('Tr', rendering).render(@canvas)
  end

  self
end

#set_text_rise(rise) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 283

def set_text_rise(rise)
  load! if @instructions.nil?
  if rise != @canvas.gs.text_state.text_rise
    @instructions << PDF::Instruction.new('Ts', rise).render(@canvas)
  end
  
  self
end

#set_text_scale(scaling) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 292

def set_text_scale(scaling)
  load! if @instructions.nil?
  if scale != @canvas.gs.text_state.scaling
    @instructions << PDF::Instruction.new('Tz', scaling).render(@canvas)
  end

  self
end

#set_text_word_spacing(word_spacing) ⇒ Object 



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# File 'lib/origami/graphics/xobject.rb', line 301

def set_text_word_spacing(word_spacing)
  load! if @instructions.nil?
  if word_spacing != @canvas.gs.text_state.word_spacing
    @instructions << PDF::Instruction.new('Tw', word_spacing).render(@canvas)
  end
  
  self
end

#write(text, attr = {}) ⇒ Object

Adds text to the content stream with custom formatting attributes.

text

Text to write.

attr

Formatting attributes.



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# File 'lib/origami/graphics/xobject.rb', line 203

def write(text, attr = {})
  load! if @instructions.nil?

  x,y       = attr[:x], attr[:y] 
  font      = attr[:font] || DEFAULT_FONT
  size      = attr[:size] || DEFAULT_SIZE
  leading   = attr[:leading] || DEFAULT_LEADING
  color     = attr[:color] || attr[:fill_color] || DEFAULT_STROKE_COLOR
  stroke_color = attr[:stroke_color] || DEFAULT_STROKE_COLOR
  line_width    = attr[:line_width] || DEFAULT_LINEWIDTH
  word_spacing  = attr[:word_spacing]
  char_spacing  = attr[:char_spacing]
  scale     = attr[:scale]
  rise      = attr[:rise]
  rendering = attr[:rendering]

  @instructions << PDF::Instruction.new('ET').render(@canvas) if (x or y) and @canvas.gs.text_state.is_in_text_object?

  unless @canvas.gs.text_state.is_in_text_object? 
    @instructions << PDF::Instruction.new('BT').render(@canvas)
  end

  set_text_font(font, size)
  set_text_pos(x, y) if x or y
  set_text_leading(leading) if leading
  set_text_rendering(rendering) if rendering
  set_text_rise(rise) if rise
  set_text_scale(scale) if scale
  set_text_word_spacing(word_spacing) if word_spacing
  set_text_char_spacing(char_spacing) if char_spacing
  set_fill_color(color)
  set_stroke_color(stroke_color) 
  set_line_width(line_width)

  write_text_block(text)
 
  self
end