samples: better units example

samples/units/_units.rb

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+require 'squib'
+
+Squib::Deck.new(width: '1.5in', height: '1.5in') do
+  background color: '#ddd'
+
+  # We can use our DSL-method to use inches
+  # Computed using @dpi (set to 300 by default)
+  bleed = inches(0.125)
+  cut   = inches(1.25)
+  rect x: bleed, y: bleed,
+       width: cut, height: cut,
+       dash: '0.5mm 0.5mm' # yes, units are in dashes too
+
+  # other units too
+  cm(2)             # We can also use cm this way
+  cm(2) + inches(2) # We can mix units too
+
+  # Or we can use a string ending with cm or in
+  safe_margin = '0.25 in' #you can have a space too
+  safe_width  = '1 in'
+  safe_height = '1.0 in  ' # trailing space is ok too
+  rect x: safe_margin, y: safe_margin,
+  	   width: safe_width, height: safe_height,
+       radius: '2 mm '
+
+  # We can also do stuff in layout. Check out the yml file...
+  #  (even cleaner in Yaml since we don't need quotes!)
+  use_layout file: 'using_units.yml'
+  text str: 'Hello.', layout: :example
+
+  save prefix: 'units_', format: :png
+end

samples/units/using_units.yml

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+base:
+  x: .25 in
+  y: 0.751in
+
+example:
+  extends: base
+  x: += 5mm # we can mix units on adding
+  y: -= 5mm
+  width: 1.25in
+  height: 300   # pixels