From 7a150c884d247bfa669dc147677256994baf734f Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@habraun.net>
Date: Wed, 11 Mar 2009 13:25:18 +0100
Subject: [PATCH] Vec2D: Added a method that can be used to determine if the
 vector is a unit vector.

---
 src/net/habraun/sd/math/Vec2D.scala      |  8 ++++++++
 test/net/habraun/sd/math/Vec2DTest.scala | 15 +++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/net/habraun/sd/math/Vec2D.scala b/src/net/habraun/sd/math/Vec2D.scala
index 307874c..53ac41a 100644
--- a/src/net/habraun/sd/math/Vec2D.scala
+++ b/src/net/habraun/sd/math/Vec2D.scala
@@ -118,4 +118,12 @@ case class Vec2D(x: Double, y: Double) {
 	 */
 
 	def project(vec: Vec2D) = vec * ((this * vec) / (vec * vec))
+
+
+
+	/**
+	 * Returns true if the vector is a unit vector, false otherwise.
+	 */
+
+	def unit = squaredLength < 1.05 && squaredLength > 0.95
 }
diff --git a/test/net/habraun/sd/math/Vec2DTest.scala b/test/net/habraun/sd/math/Vec2DTest.scala
index 6f2c658..9a75144 100644
--- a/test/net/habraun/sd/math/Vec2DTest.scala
+++ b/test/net/habraun/sd/math/Vec2DTest.scala
@@ -116,4 +116,19 @@ class Vec2DTest {
 		val vec2 = Vec2D(1, 0)
 		assertEquals(Vec2D(5, 0), vec1.project(vec2))
 	}
+
+
+
+	@Test
+	def isUnit {
+		val unit = Vec2D(1, 0)
+		val nonUnit = Vec2D(2, 0)
+		val unitWithTolerance1 = Vec2D(0.98, 0)
+		val unitWithTolerance2 = Vec2D(1.02, 0)
+
+		assertTrue(unit.unit)
+		assertFalse(nonUnit.unit)
+		assertTrue(unitWithTolerance1.unit)
+		assertTrue(unitWithTolerance2.unit)
+	}
 }
-- 
2.11.4.GIT