Allow negative coordinates in sprue coordinates

Fixes #336

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Squib CHANGELOG
 Squib follows [semantic versioning](http://semver.org).
 
+## v0.17.1 / 2021-08-11
+
+Bugs:
+* Sprues now allow negative coordinates (#336)
+* Documentation typos (#337)
+
 ## v0.17.0 / 2021-07-23
 Features:
 * Drop shadows! The `save_png` method now supports a bunch of `shadow_` arguments that will add a drop shadow just before rendering. This is intended for using in rulebooks or marketing. Try it out by adding `shadow_radius: 8` to your save_png (#306, #264)

lib/squib/sprues/sprue_schema.rb

@@ -1,7 +1,8 @@
 module Squib
   module Sprues
     UNIT_REGEX = /^(\d*[.])?\d+(in|cm|mm)$/
-    ROTATE_REGEX = /^(\d*[.])?\d+(deg|rad)?$/
+    COORD_REGEX = /^\-?(\d*[.])?\d+(in|cm|mm)$/
+    ROTATE_REGEX = /^\-?(\d*[.])?\d+(deg|rad)?$/
     SCHEMA = {
       'sheet_width' => UNIT_REGEX,
       'sheet_height' => UNIT_REGEX,
@@ -35,8 +36,8 @@ module Squib
         }]]
       },
       'cards' => [[{
-        'x' => UNIT_REGEX,
-        'y' => UNIT_REGEX,
+        'x' => COORD_REGEX,
+        'y' => COORD_REGEX,
         'rotate' => [
           :optional, Numeric,
           ClassyHash::G.enum(:clockwise, :counterclockwise, :turnaround),

samples/sprues/_negative_coords.rb

@@ -0,0 +1,7 @@
+require_relative '../../lib/squib'
+
+Squib::Deck.new(width: 100, height: 100, cards: 3) do 
+  background color: :grey
+  text str: 'Hello', font: 'Sans Bold 10'
+  save_sheet sprue: 'my_sprues/negatives.yml', prefix: 'sprue_negatives_'
+end

samples/sprues/my_sprues/negatives.yml

@@ -0,0 +1,12 @@
+---
+sheet_width: 3.0in
+sheet_height: 3.0in
+card_width: 1in
+card_height: 1in
+cards:
+- x: -0.15in
+  y: -0.10in
+- x: 1.5in
+  y: 0.5in
+- x: 0.5in
+  y: 1.5in

spec/data/sprues/negatives.yml

@@ -0,0 +1,7 @@
+sheet_width: 8.5in
+sheet_height: 11in
+card_width: 2.5in
+card_height: 3.5in
+cards:
+- x: -0.5in
+  y: -1in

spec/sprue_spec.rb

@@ -158,6 +158,13 @@ describe Squib::Sprue do
     expect(tmpl.cards.map { |card| card['flip_horizontal'] })
       .to eq( [false, false, true] )
   end
+  
+  it 'parses negative coordinates' do
+    tmpl = Squib::Sprue.load(sprue_file('negatives.yml'), 100, 37.5)
+    expect(tmpl.cards.length).to eq(1)
+    expect(tmpl.cards.map { |card| card['x'] }) .to eq( [-50] )
+    expect(tmpl.cards.map { |card| card['y'] }) .to eq( [-100] )
+  end
 
   it 'fails when sheet_width is not defined' do
     expect do