Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/LineHelper.cs
===================================================================
diff -u -r4052 -r4184
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/LineHelper.cs	(.../LineHelper.cs)	(revision 4052)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/LineHelper.cs	(.../LineHelper.cs)	(revision 4184)
@@ -28,24 +28,27 @@
 /// <summary>
 /// Helper class for Line objects
 /// </summary>
-public static class LineHelper
+public class LineHelper
 {
+    
+    private readonly Routines2D routines2D = new Routines2D();
+    
     /// <summary>
     /// Calculate intersection between two lines (strict interpolation)
     /// </summary>
     /// <param name="line1"></param>
     /// <param name="line2"></param>
     /// <param name="intersectPoint"></param>
     /// <returns></returns>
-    public static bool GetStrictIntersectionPoint(Line line1, Line line2, ref GeometryPoint intersectPoint)
+    public bool GetStrictIntersectionPoint(Line line1, Line line2, ref GeometryPoint intersectPoint)
     {
         var point1 = new Point2D(line1.BeginPoint.X, line1.BeginPoint.Z);
         var point2 = new Point2D(line1.EndPoint.X, line1.EndPoint.Z);
         var point3 = new Point2D(line2.BeginPoint.X, line2.BeginPoint.Z);
         var point4 = new Point2D(line2.EndPoint.X, line2.EndPoint.Z);
 
         Point2D ip;
-        LineIntersection res = Routines2D.DetermineIf2DLinesIntersectStrickly(point1, point2, point3,
+        LineIntersection res = routines2D.DetermineIf2DLinesIntersectStrickly(point1, point2, point3,
                                                                               point4, out ip);
         if (ip != null)
         {
@@ -66,7 +69,7 @@
     /// <param name="radius">Circle's radius</param>
     /// <param name="pointss">Point collection which defines a line. Extrapolation is performed at the start and end points.</param>
     /// <returns>Intersections of this line extrapolated to the negative and positive X with the circle.</returns>
-    public static List<Point2D> ExtendedSurfaceIntersectionPointsWithCircle(double xMid, double zMid, double radius, IList<Point2D> pointss)
+    public List<Point2D> ExtendedSurfaceIntersectionPointsWithCircle(double xMid, double zMid, double radius, IList<Point2D> pointss)
     {
         List<Point2D> points = pointss.Where(p => !double.IsNaN(p.X)).ToList();
         if (points.Count >= 2)
@@ -103,7 +106,7 @@
     /// <param name="radius">The radius.</param>
     /// <param name="points">The points.</param>
     /// <returns></returns>
-    public static List<Point2D> IntersectionPointsWithCircle(double xMid, double zMid, double radius, IList<Point2D> points)
+    public List<Point2D> IntersectionPointsWithCircle(double xMid, double zMid, double radius, IList<Point2D> points)
     {
         var result = new List<Point2D>();
         if (points.Count >= 2)
@@ -131,7 +134,7 @@
         return result;
     }
 
-    public static GeometryPoint GetIntersectionPointWithExtrapolation(GeometryPoint p1, GeometryPoint p2, GeometryPoint p3, GeometryPoint p4)
+    public GeometryPoint GetIntersectionPointWithExtrapolation(GeometryPoint p1, GeometryPoint p2, GeometryPoint p3, GeometryPoint p4)
     {
         return IntersectionPointWithExtrapolation(p1, p2, p3, p4);
     }
@@ -144,9 +147,9 @@
     /// <param name="r">The r.</param>
     /// <param name="line">The line.</param>
     /// <returns></returns>
-    private static List<Point2D> Intersect_Circle_line(double xm, double ym, double r, Line line)
+    private List<Point2D> Intersect_Circle_line(double xm, double ym, double r, Line line)
     {
-        return Routines2D.IntersectCircleline(xm, ym, r, line.BeginPoint.X, line.EndPoint.X, line.BeginPoint.Z, line.EndPoint.Z);
+        return routines2D.IntersectCircleline(xm, ym, r, line.BeginPoint.X, line.EndPoint.X, line.BeginPoint.Z, line.EndPoint.Z);
     }
 
     /// <summary>
@@ -157,7 +160,7 @@
     /// <param name="p3"></param>
     /// <param name="p4"></param>
     /// <returns>Intersection point or null (parallel lines)</returns>
-    private static GeometryPoint IntersectionPointWithExtrapolation(GeometryPoint p1, GeometryPoint p2, GeometryPoint p3, GeometryPoint p4)
+    private GeometryPoint IntersectionPointWithExtrapolation(GeometryPoint p1, GeometryPoint p2, GeometryPoint p3, GeometryPoint p4)
     {
         GeometryPoint intersectPoint = null;
 
@@ -166,7 +169,7 @@
         var point3 = new Point2D(p3.X, p3.Z);
         var point4 = new Point2D(p4.X, p4.Z);
 
-        Routines2D.DetermineIf2DLinesIntersectWithExtrapolation(point1, point2, point3, point4, out Point2D ip);
+        routines2D.DetermineIf2DLinesIntersectWithExtrapolation(point1, point2, point3, point4, out Point2D ip);
         if (ip != null)
         {
             intersectPoint = new GeometryPoint(ip.X, ip.Z);