Implemented road & road mesh generator.

Game/Assets/Scripts/Model/LineSegment.cs

@@ -43,6 +43,14 @@ namespace TransportGame.Model
             }
         }
 
+        public Vector2 Direction
+        {
+            get
+            {
+                return (P1 - P0).Normalized;
+            }
+        }
+
         public LineSegment(Vector2 p0, Vector2 p1)
             : this()
         {

Game/Assets/Scripts/Model/Road/RoadSegment.cs

@@ -80,6 +80,33 @@ namespace TransportGame.Model.Road
         [XmlAttribute("lanesTo1")]
         public int LanesTo1 { get; set; }
         
+        /// <summary>
+        /// Gets the direction vector of this road segment
+        /// </summary>
+        [XmlIgnore]
+        public Vector2 Direction
+        {
+            get
+            {
+                if (Terminal1Id == -1 || Terminal2Id == -1 || ParentNetwork == null)
+                    return Vector2.Zero;
+
+                return (Terminal2.Position - Terminal1.Position).Normalized;
+            }
+        }
+
+        /// <summary>
+        /// Gets the road segment as a line segment
+        /// </summary>
+        /// <returns></returns>
+        public LineSegment AsLineSegment()
+        {
+            if (Terminal1Id == -1 || Terminal2Id == -1 || ParentNetwork == null)
+                throw new InvalidOperationException("Terminals are not initialized.");
+
+            return new LineSegment(Terminal1.Position, Terminal2.Position);
+        }
+
         /// <summary>
         /// Initializes road segment
         /// </summary>

Game/Assets/Scripts/Model/Vector2.cs

@@ -78,6 +78,22 @@ namespace TransportGame.Model
             }
         }
 
+        /// <summary>
+        /// Gets the normalized vector raised to second power
+        /// </summary>
+        /// <remarks>
+        /// This is less computationally expensive (no need to calculate square root).
+        /// </remarks>
+        /// <returns>Normalized vector</returns>
+        public Vector2 NormalizedSq
+        {
+            get
+            {
+                float len2 = LengthSq;
+                return new Vector2(X * X / len2, Y * Y / len2);
+            }
+        }
+
         /// <summary>
         /// Rotates vector by given number of radians
         /// </summary>
@@ -123,6 +139,16 @@ namespace TransportGame.Model
             return new Vector2(a.X - b.X, a.Y - b.Y);
         }
 
+        /// <summary>
+        /// Negation operator
+        /// </summary>
+        /// <param name="a">Vector</param>
+        /// <returns>Negated vector</returns>
+        public static Vector2 operator -(Vector2 a)
+        {
+            return new Vector2(-a.X, -a.Y);
+        }
+
         /// <summary>
         /// Multiply by constant
         /// </summary>
@@ -188,6 +214,28 @@ namespace TransportGame.Model
             return a.X * b.X + a.Y * b.Y;
         }
 
+        /// <summary>
+        /// Returns the magnitude of the cross product between the two vectors (z considered 0)
+        /// </summary>
+        /// <param name="a">First vector</param>
+        /// <param name="b">Second vector</param>
+        /// <returns>Magnitude of cross product</returns>
+        public static float Cross(Vector2 a, Vector2 b)
+        {
+            return (a.X * b.Y) - (a.Y * b.X);
+        }
+
+        /// <summary>
+        /// Tests if two vectors are colliniar
+        /// </summary>
+        /// <param name="a">a</param>
+        /// <param name="b">b</param>
+        /// <returns>True if vectors are colliniar</returns>
+        public static bool AreColliniar(Vector2 a, Vector2 b)
+        {
+            return Math.Abs(Cross(a, b)) < 1e-12;
+        }
+
         /// <summary>
         /// Gets the vector corresponding with specified angle (in radians)
         /// </summary>