Method: RBPDF#getHTMLUnitToUnits

Defined in:
lib/rbpdf.rb

#getHTMLUnitToUnits(htmlval, refsize = 1, defaultunit = 'px', points = false) ⇒ Object Also known as: get_html_unit_to_units

convert HTML string containing value and unit of measure to user’s units or points.

@param string :htmlval

string containing values and unit

@param string :refsize

reference value in points

@param string :defaultunit

default unit (can be one of the following: %, em, ex, px, in, mm, pc, pt).

@param boolean :point

if true returns points, otherwise returns value in user’s units

@return float

value in user’s unit or point if :points=true

@access public
@since 4.4.004 (2008-12-10)


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# File 'lib/rbpdf.rb', line 15605

def getHTMLUnitToUnits(htmlval, refsize=1, defaultunit='px', points=false)
  supportedunits = ['%', 'em', 'ex', 'px', 'in', 'cm', 'mm', 'pc', 'pt']
  retval = 0
  value = 0
  unit = 'px'
  k = @k
  if points
    k = 1
  end
  if supportedunits.include?(defaultunit)
    unit = defaultunit
  end
  if htmlval.is_a?(Numeric)
    value = htmlval.to_f
  else
    mnum = htmlval.scan(/[0-9\.\-\+]+/)
    unless mnum.empty?
      value = mnum[0].to_f
      munit = htmlval.scan(/[a-z%]+/)
      unless munit.empty?
        if supportedunits.include?(munit[0])
          unit = munit[0]
        end
      end
    end
  end
  case unit
  when '%' # percentage
    retval = (value * refsize) / 100.0
  when 'em' # relative-size
    retval = value * refsize
  when 'ex' # height of lower case 'x' (about half the font-size)
    retval = value * (refsize / 2.0)
  when 'in' # absolute-size
    retval = (value * @dpi) / k
  when 'cm' # centimeters
    retval = (value / 2.54 * @dpi) / k
  when 'mm' # millimeters
    retval = (value / 25.4 * @dpi) / k
  when 'pc' # one pica is 12 points
    retval = (value * 12) / k
  when 'pt' # points
    retval = value / k
  when 'px' # pixels
    retval = pixelsToUnits(value)
  end
  return retval
end