Revit.SDK.Samples.CurtainWallGrid.CS.GridDrawing.GetSegments C# (CSharp) Method

        private void GetSegments(GridLine2D gridLine2D, CurveArray allCurves,
          List<SegmentLine2D> skippedSegments, List<GraphicsPath> segPaths,
          int gridLineIndex)
        {
            int segIndex = -1;
             // convert the segments from Curve format to SegmentLine2D format (from 3D to 2D)
             foreach (Curve curve in allCurves)
             {
            // store the index of the segment in the grid line
            segIndex++;
            Autodesk.Revit.DB.XYZ point1 = curve.get_EndPoint(0);
            Autodesk.Revit.DB.XYZ point2 = curve.get_EndPoint(1);

            Vector4 v1 = new Vector4(point1);
            Vector4 v2 = new Vector4(point2);

            // transform from 3D point to 2D point
            v1 = m_coordinates.TransformMatrix.Transform(v1);
            v2 = m_coordinates.TransformMatrix.Transform(v2);

            // add the segment data
            SegmentLine2D segLine2D = new SegmentLine2D();
            segLine2D.StartPoint = new System.Drawing.Point((int)v1.X, (int)v1.Y);
            segLine2D.EndPoint = new System.Drawing.Point((int)v2.X, (int)v2.Y);
            // if the segment is contained in the skipped list, set the Removed flag to true; otherwise false
            segLine2D.Removed = IsSegLineContained(skippedSegments, segLine2D);
            // if the segment is in a U grid line, set it true; otherwise false
            segLine2D.IsUSegment = gridLine2D.IsUGridLine;
            // the index of the parent grid line in the grid line list
            segLine2D.GridLineIndex = gridLineIndex;
            // the index of the segment in its parent grid line
            segLine2D.SegmentIndex = segIndex;
            if (true == segLine2D.Removed)
            {
               gridLine2D.RemovedNumber++;
            }
            gridLine2D.Segments.Add(segLine2D);

            // store the mapped graphics path
            GraphicsPath path = new GraphicsPath();
            path.AddLine(segLine2D.StartPoint, segLine2D.EndPoint);
            segPaths.Add(path);
             }
        }