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diff --git a/src/vector.h b/src/vector.h
index c7f2771..4bcb461 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -3,20 +3,25 @@
 //
 // Various structures used for 3 dimensional imaging
 //
-// by James L. Hammons
-// (C) 2001 Underground Software
+// by James Hammons
+// (C) 2001, 2014 Underground Software
 //
 
 #ifndef __VECTOR_H__
 #define __VECTOR_H__
 
-// What we'll do here is create the vector type and use typedef to alias Point to it. Yeah, that's it.
+// What we'll do here is create the vector type and use typedef to alias Point
+// to it. Yeah, that's it.
+
+class Vector;
+typedef Vector Point;
 
 class Vector
 {
 	public:
 		Vector(double xx = 0, double yy = 0, double zz = 0);
 		Vector(Vector tail, Vector head);		// Create vector from two points
+		void SetAngleAndLength(double angle, double length);
 		Vector operator=(Vector const v);
 		Vector operator+(Vector const v);
 		Vector operator-(Vector const v);
@@ -47,13 +52,13 @@ class Vector
 
 		static double Dot(Vector v1, Vector v2);
 		static double Magnitude(Vector v1, Vector v2);
+		static double Angle(Point p1, Point p2);
 		static double Parameter(Vector v1, Vector v2, Vector p);
 		static Vector Normal(Vector v1, Vector v2);
+		static double AngleBetween(Vector a, Vector b);
 
 	public:
 		double x, y, z;
 };
 
-typedef Vector Point;
-
 #endif	// __VECTOR_H__