Class: PDF::Reader::WidthCalculator::TypeOneOrThree

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/width_calculator/type_one_or_three.rb

Overview

Calculates the width of a glyph in a Type One or Type Three

Instance Method Summary collapse

Constructor Details

#initialize(font) ⇒ TypeOneOrThree

Returns a new instance of TypeOneOrThree


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# File 'lib/pdf/reader/width_calculator/type_one_or_three.rb', line 8

def initialize(font)
  @font = font

  if @font.font_descriptor
    @missing_width = @font.font_descriptor.missing_width
  else
    @missing_width = 0
  end
end

Instance Method Details

#glyph_width(code_point) ⇒ Object


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# File 'lib/pdf/reader/width_calculator/type_one_or_three.rb', line 18

def glyph_width(code_point)
  return 0 if code_point.nil? || code_point < 0
  return 0 if @font.widths.nil? || @font.widths.count == 0

  # in ruby a negative index is valid, and will go from the end of the array
  # which is undesireable in this case.
  if @font.first_char <= code_point
    @font.widths.fetch(code_point - @font.first_char, @missing_width).to_f
  else
    @missing_width.to_f
  end
end