manual/basic_concepts/measurement.rb
# frozen_string_literal: true
require 'prawn/manual_builder'
Prawn::ManualBuilder::Chapter.new do
title 'Measurement Extensions'
text do
prose <<~TEXT
The base unit in Prawn is the PDF Point. One PDF Point is equal to 1/72
of an inch.
There is no need to waste time converting this measure. Prawn provides
helpers for converting from other measurements to PDF Points.
Just <code>require "prawn/measurement_extensions"</code> and it will mix
some helpers onto <code>Numeric</code> for converting common measurement
units to PDF Points.
TEXT
end
example do
require 'prawn/measurement_extensions'
%i[mm cm dm m in yd ft].each do |measurement|
text "1 #{measurement} in PDF Points: #{1.public_send(measurement)} pt"
move_down 5.mm
end
end
end