From 76270390d1e5c2e98e411761a9855280474d6762 Mon Sep 17 00:00:00 2001
From: mo khan <mo@mokhan.ca>
Date: Wed, 8 Apr 2015 12:23:44 -0600
Subject: define a circle.

---
 lib/scale.rb        |  1 +
 lib/scale/circle.rb | 17 +++++++++++++++++
 spec/circle_spec.rb | 25 +++++++++++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 lib/scale/circle.rb
 create mode 100644 spec/circle_spec.rb

diff --git a/lib/scale.rb b/lib/scale.rb
index 02ffc09..e8bc61f 100644
--- a/lib/scale.rb
+++ b/lib/scale.rb
@@ -2,6 +2,7 @@ require "scale/version"
 require "scale/node"
 require "scale/svg"
 require "scale/rectangle"
+require "scale/circle"
 
 module Scale
   # Your code goes here... NOT!
diff --git a/lib/scale/circle.rb b/lib/scale/circle.rb
new file mode 100644
index 0000000..edf8e6c
--- /dev/null
+++ b/lib/scale/circle.rb
@@ -0,0 +1,17 @@
+module Scale
+  class Circle
+    include Node
+    include Virtus.model
+    attribute :cx, Integer
+    attribute :cy, Integer
+    attribute :r, Integer
+
+    def xml_tag
+      :circle
+    end
+
+    def attributes
+      super.delete_if { |key, value| value.nil? }
+    end
+  end
+end
diff --git a/spec/circle_spec.rb b/spec/circle_spec.rb
new file mode 100644
index 0000000..27486b8
--- /dev/null
+++ b/spec/circle_spec.rb
@@ -0,0 +1,25 @@
+
+describe Scale::Circle do
+  it { expect(subject.xml_tag).to eql(:circle) }
+
+  describe "#attributes" do
+    it "includes the radius" do
+      subject.r = 10
+      expect(subject.attributes).to include(r: 10)
+    end
+
+    it "includes the x position of the center of the circle" do
+      subject.cx = 10
+      expect(subject.attributes).to include(cx: 10)
+    end
+
+    it "includes the y position of the center of the circle" do
+      subject.cy = 10
+      expect(subject.attributes).to include(cy: 10)
+    end
+
+    it "skips attributes that are not specified" do
+      expect(subject.attributes).to be_empty
+    end
+  end
+end
-- 
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