add relative movements.

2 files changed, 27 insertions, 6 deletions

diff --git a/lib/scale/shapes/path.rb b/lib/scale/shapes/path.rb
index 1b8af99..a495852 100644
--- a/lib/scale/shapes/path.rb
+++ b/lib/scale/shapes/path.rb
@@ -11,12 +11,12 @@ module Scale
       command("L #{x} #{y}")
     end
 
-    def horizontal(n)
-      command("H #{n}")
+    def horizontal(n, relative: false)
+      command("#{relative ? "h" : "H"} #{n}")
     end
 
-    def vertical(n)
-      command("V #{n}")
+    def vertical(n, relative: false)
+      command("#{relative ? "v" : "V"} #{n}")
     end
 
     def close_path
diff --git a/spec/shapes/path_spec.rb b/spec/shapes/path_spec.rb
index 646acfa..f6df8c0 100644
--- a/spec/shapes/path_spec.rb
+++ b/spec/shapes/path_spec.rb
@@ -32,11 +32,24 @@ describe Scale::Path do
       XML
       expect(subject.to_xml).to eql(expected)
     end
+
+    it 'moves horizontally using relative position' do
+      subject.move_to(x: 10, y: 10)
+      subject.horizontal(90, relative: true)
+      expected = <<-XML
+<?xml version="1.0"?>
+<path d="M10 10 h 90"/>
+      XML
+      expect(subject.to_xml).to eql(expected)
+    end
   end
 
   describe "#vertial" do
-    it 'draws a horizontal line' do
+    before :each do
       subject.move_to(x: 10, y: 10)
+    end
+
+    it 'draws a vertical line' do
       subject.vertical(90)
       expected = <<-XML
 <?xml version="1.0"?>
@@ -44,6 +57,15 @@ describe Scale::Path do
       XML
       expect(subject.to_xml).to eql(expected)
     end
+
+    it 'draws a vertical line relative to the current position' do
+      subject.vertical(90, relative: true)
+      expected = <<-XML
+<?xml version="1.0"?>
+<path d="M10 10 v 90"/>
+      XML
+      expect(subject.to_xml).to eql(expected)
+    end
   end
 
   describe "#close_path" do
@@ -74,5 +96,4 @@ describe Scale::Path do
       expect(subject.to_xml).to eql(expected)
     end
   end
-
 end