Module: Asciidoctor::PDF::Measurements

Included in:
FormattedText::InlineImageArranger, ThemeLoader, Asciidoctor::Prawn::Extensions
Defined in:
lib/asciidoctor/pdf/measurements.rb

Constant Summary collapse

MeasurementValueRx = 
/(\d+|\d*\.\d+)(in|mm|cm|p[txc])?$/
InsetMeasurementValueRx = 
/(?<=^| |\()(-?\d+(?:\.\d+)?)(in|mm|cm|p[txc])(?=$| |\))/
MeasurementValueHintRx = 
/\d(in|mm|cm|p[txc])/

Instance Method Summary collapse

Instance Method Details

#resolve_measurement_values(str) ⇒ Object

Resolve measurement values in the string to PDF points.



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# File 'lib/asciidoctor/pdf/measurements.rb', line 53

def resolve_measurement_values str
  if MeasurementValueHintRx.match? str
    str.gsub(InsetMeasurementValueRx) { to_pt $1.to_f, $2 }
  else
    str
  end
end

#str_to_pt(val) ⇒ Object

Convert the specified string value to a pt value from the specified unit of measurement (e.g., in, cm, mm, etc). If the unit of measurement is not recognized, assume pt.

Examples:

0.5in => 36.0
100px => 75.0
72blah => 72.0



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# File 'lib/asciidoctor/pdf/measurements.rb', line 20

def str_to_pt val
  MeasurementValueRx =~ val ? (to_pt $1.to_f, $2) : val.to_f
end

#to_pt(num, units) ⇒ Object

Converts the specified float value to a pt value from the specified unit of measurement (e.g., in, cm, mm, etc). Raises an argument error if the unit of measurement is not recognized.



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# File 'lib/asciidoctor/pdf/measurements.rb', line 27

def to_pt num, units
  units = units.to_s if ::Symbol === units
  if units.nil_or_empty?
    num
  else
    case units
    when 'pt'
      num
    when 'in'
      num * 72
    when 'mm'
      num * (72 / 25.4)
    when 'cm'
      num * (720 / 25.4)
    when 'px'
      # assuming canvas of 96 dpi
      num * 0.75
    when 'pc'
      num * 12
    else
      raise ::ArgumentError, %(unknown unit of measurement: #{units})
    end
  end
end