class PDF::Reader::TextRun

A value object that represents one or more consecutive characters on a page.

def +(other) 

def +(other)
  raise ArgumentError, "#{other} cannot be merged with this run" unless mergable?(other)
  if (other.x - endx) <( font_size * 0.2)
    TextRun.new(x, y, other.endx - x, font_size, text + other.text)
  else
    TextRun.new(x, y, other.endx - x, font_size, "#{text} #{other.text}")
  end
end

def <=>(other)

in order of their position on a cartesian plain - Top Left to Bottom Right
Allows collections of TextRun objects to be sorted. They will be sorted 
def <=>(other)
  if x == other.x && y == other.y
    0
  elsif y < other.y
    1
  elsif y > other.y
    -1
  elsif x < other.x
    -1
  elsif x > other.x
    1
  end
end

def area 

def area
  (endx - x) * (endy - y)
end

def character_count

character count
Assume string encoding is marked correctly and we can trust String#size to return a 
def character_count
  @text.size.to_f
end

def endx 

def endx
  @endx ||= @origin.x + width
end

def endy 

def endy
  @endy ||= @origin.y + font_size
end

def initialize(x, y, width, font_size, text) 

def initialize(x, y, width, font_size, text)
  @origin = PDF::Reader::Point.new(x, y)
  @width = width
  @font_size = font_size
  @text = text
end

def inspect 

def inspect
  "#{text} w:#{width} f:#{font_size} @#{x},#{y}"
end

def intersect?(other_run) 

def intersect?(other_run)
  x <= other_run.endx && endx >= other_run.x &&
    endy >= other_run.y && y <= other_run.endy
end

def intersection_area_percent(other_run)

return what percentage of this text run is overlapped by another run 
def intersection_area_percent(other_run)
  return 0 unless intersect?(other_run)
  dx = [endx, other_run.endx].min - [x, other_run.x].max
  dy = [endy, other_run.endy].min - [y, other_run.y].max
  intersection_area = dx*dy
  intersection_area.to_f / area
end

def mean_character_width 

def mean_character_width
  @width / character_count
end

def mergable?(other) 

def mergable?(other)
  y.to_i == other.y.to_i && font_size == other.font_size && mergable_range.include?(other.x)
end

def mergable_range 

def mergable_range
  @mergable_range ||= Range.new(endx - 3, endx + font_size)
end

def x 

def x
  @origin.x
end

def y 

def y
  @origin.y
end