From eebe7e2731bff81c12fcc73f69efa340941ed01a Mon Sep 17 00:00:00 2001
From: Jonathan Puckey <me@jonathanpuckey.com>
Date: Sat, 26 Feb 2011 19:19:02 +0100
Subject: [PATCH] Implement Path.RegularPolygon constructor and add tests for
 it.

---
 src/path/Path.Constructors.js | 13 +++++++++++++
 test/tests/Path_Shapes.js     | 11 +++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/path/Path.Constructors.js b/src/path/Path.Constructors.js
index 30c44e7e..f0b0e137 100644
--- a/src/path/Path.Constructors.js
+++ b/src/path/Path.Constructors.js
@@ -102,6 +102,19 @@ Path.inject({ statics: new function() {
 			path.moveTo(from);
 			path.arcTo(through, to);
 			return path;
+		},
+		
+		RegularPolygon: function(center, numSides, radius) {
+			center = new Point(center);
+			var path = new Path();
+			var three = !(numSides % 3);
+			var vector = new Point(0, three ? -radius : radius);
+			for(var i = 0; i < numSides; i++) {
+				var angle = (360 / numSides) * (i + (three ? -1 : 0.5));
+				path.add(center.add(vector.rotate(angle)));
+			}
+			path.closed = true;
+			return path;
 		}
 	};
 }});
diff --git a/test/tests/Path_Shapes.js b/test/tests/Path_Shapes.js
index d5fe274c..c403bb19 100644
--- a/test/tests/Path_Shapes.js
+++ b/test/tests/Path_Shapes.js
@@ -37,4 +37,15 @@ test('new Path.Arc(from, through, to)', function() {
 	var path = new Path.Arc([50, 50], [100, 100], [75, 75]);
 	var expectedSegments = [{ point: { x: 50, y: 50 }, handleOut: { x: 10.11156, y: -10.11156 } }, { point: { x: 88.5299, y: 42.33593 }, handleIn: { x: -13.21138, y: -5.47233 }, handleOut: { x: 13.21138, y: 5.47233 } }, { point: { x: 110.35534, y: 75 }, handleIn: { x: 0, y: -14.2999 } }];
 	compareSegmentLists(path.segments, expectedSegments);
+});
+
+test('new Path.RegularPolygon(center, numSides, radius)', function() {
+	var doc = new Doc();
+	var path = new Path.RegularPolygon(new Point(50, 50), 3, 10);
+	var expectedSegments = [{ point: { x: 41.33984, y: 55 } }, { point: { x: 50, y: 40 } }, { point: { x: 58.66016, y: 55 } }];
+	compareSegmentLists(path.segments, expectedSegments);
+
+	var path = new Path.RegularPolygon(new Point(250, 250), 10, 100);
+	var expectedSegments = [{ point: { x: 219.09814, y: 345.10547 } }, { point: { x: 169.09814, y: 308.77832 } }, { point: { x: 150, y: 250 } }, { point: { x: 169.09814, y: 191.22168 } }, { point: { x: 219.09814, y: 154.89453 } }, { point: { x: 280.90186, y: 154.89453 } }, { point: { x: 330.90186, y: 191.22168 } }, { point: { x: 350, y: 250 } }, { point: { x: 330.90186, y: 308.77832 } }, { point: { x: 280.90186, y: 345.10547 } }];
+	compareSegmentLists(path.segments, expectedSegments);
 });
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