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# $Id: units.rb,v 1.5 2009/02/28 23:52:28 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
module Magick
class RVG
# Define RVG.dpi and RVG.dpi=. Add conversions to Integer and Float classes
class << self
attr_reader :dpi
def dpi=(n)
unless defined?(@dpi)
[Float, Integer].each do |c|
c.class_eval <<-END_DEFS, __FILE__, __LINE__ + 1
# the default measurement - 1px is 1 pixel
def px
self
end
# inches
def in
self * ::Magick::RVG.dpi
end
# millimeters
def mm
self * ::Magick::RVG.dpi / 25.4
end
# centimeters
def cm
self * ::Magick::RVG.dpi / 2.54
end
# points
def pt
self * ::Magick::RVG.dpi / 72.0
end
# picas
def pc
self * ::Magick::RVG.dpi / 6.0
end
# percentage of the argument
def pct(of)
self * Float(of) / 100.0
end
# the default is deg
def deg
self
end
# radians -> degrees
def rad
self * 180.0 / Math::PI
end
# grads -> degrees
def grad
self * 9.0 / 10.0
end
END_DEFS
end
end
@dpi = Float(n)
@dpi
rescue ArgumentError
raise TypeError, "Can't convert `#{n}' to Float"
end
end # class << self
end # class RVG
end # module Magick
Version data entries
21 entries across 21 versions & 1 rubygems