shorthands for xywh! initial implementation

samples/shorthands/_shorthands.rb

@@ -12,18 +12,29 @@ Squib::Deck.new(width: '0.5in', height: '0.25in') do
   rect width: 30, height: 30, 
        x: :center, y: 'center'
 
+  # Applies to shapes
+  triangle x1: 20, y1: 20,
+           x2: 60, y2: 20,
+           x3: :middle, y3: :middle
+  
+  # We can also do width-, height-, width/, height/
+  rect x: 20, y: 5, stroke_color: :green,
+  width: 'width - 0.1in', height: 10
+  
+  rect x: 10, y: 50, width: 10, height: 'height / 3', 
+       stroke_color: :purple
+       
   # Layouts apply this too.
   use_layout file: 'shorthands.yml'
   rect layout: :example
-
   # The x and y coordinates can also be "centered", assuming the 
 
   # HOWEVER! Shorthands don't combine in an "extends" situation, 
-  # e.g. this won't work: 
+  # e.g. this won't work:
   # parent:
-  #   x: middle 
-  # child: 
-  #   extends: parent 
+  #   x: middle
+  # child:
+  #   extends: parent
   #   x: += 0.5in
 
   save_png prefix: 'shorthand_'