Document and test rtl option

CHANGELOG.md

@@ -5,6 +5,7 @@ Squib follows [semantic versioning](http://semver.org).
 
 Features:
 * `circle` method now supports various `arc` options, so you can draw partial circles (#211) by @sparr
+* `save_sheet` method now supports `rtl` or "right-to-left", for easier duplex printing of backs (#204, #208) by @sparr
 
 Special thanks to @sparr for all of his work!!
 

samples/saves/_saves.rb

@@ -42,4 +42,10 @@ Squib::Deck.new(width: 825, height: 1125, cards: 16) do
              range: 0..5,
              columns: 2, rows: 2,
              margin: 75, gap: 5, trim: 37
+
+  # Sheets can arrange left-to-right and right-to-left
+  save_sheet prefix: 'save_sheet_rtl_',
+             range: 0..1, rtl: true,
+             columns: 2, rows: 1,
+             margin: 75, gap: 5, trim: 37
 end

spec/data/samples/saves/_saves.rb.txt

@@ -1719,6 +1719,15 @@ cairo: paint([])
 cairo: set_source([MockDouble, 180, 75])
 cairo: paint([])
 surface: write_to_png(["_output/save_sheet_range_01.png"])
+cairo: set_source([MockDouble, -37, -37])
+cairo: paint([])
+cairo: set_source([MockDouble, 767, 75])
+cairo: paint([])
+cairo: set_source([MockDouble, -37, -37])
+cairo: paint([])
+cairo: set_source([MockDouble, 662, 75])
+cairo: paint([])
+surface: write_to_png(["_output/save_sheet_rtl_00.png"])
 surface: finish([])
 surface: finish([])
 surface: finish([])