assets/samples/Samples/PathReinforcement/CS/Profile.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using System.Drawing.Drawing2D;

namespace Revit.SDK.Samples.PathReinforcement.CS
{
   /// <summary>
   /// This class stores the geometry information of path reinforcement.
   /// </summary>
   class Profile : IDisposable
   {
      /// <summary>
      /// field used to store path reinforcement.
      /// </summary>
      private Autodesk.Revit.DB.Structure.PathReinforcement m_pathRein;

      /// <summary>
      /// field used to store external command data.
      /// </summary>
      private Autodesk.Revit.UI.ExternalCommandData m_commandData;

      /// <summary>
      /// field used to store the geometry curves of path reinforcement.
      /// 3d data.
      /// </summary>
      private List<List<XYZ>> m_curves = new List<List<XYZ>>();

      /// <summary>
      /// store path 3D.
      /// </summary>
      private List<List<XYZ>> m_path = new List<List<XYZ>>();

      /// <summary>
      /// field used to store the bound of the curves of path reinforcement.
      /// 2d data.
      /// </summary>
      private BoundingBoxUV m_box;

      /// <summary>
      /// field used to store the geometry data of curves of path reinforcement.
      /// 2d data.
      /// </summary>
      private List<List<UV>> m_point2d = new List<List<UV>>();

      /// <summary>
      /// store path 2D.
      /// </summary>
      private List<List<UV>> m_path2d = new List<List<UV>>();

      /// <summary>
      /// Constructor
      /// </summary>
      /// <param name="pathRein">selected path reinforcement element.</param>
      /// <param name="commandData">External command data</param>
      public Profile(Autodesk.Revit.DB.Structure.PathReinforcement pathRein, ExternalCommandData commandData)
      {
         m_box = new BoundingBoxUV();
         m_pathRein = pathRein;
         m_commandData = commandData;
         Tessellate();
         ComputeBound();
         ComputePathTo2D();
      }

      /// <summary>
      /// Draw the curves of path reinforcement.
      /// </summary>
      /// <param name="graphics">Gdi object, used to draw curves of path reinforcement.</param>
      /// <param name="size">Bound to limit the size of the whole picture</param>
      /// <param name="pen">Gdi object,determine the color of the line.</param>
      public void Draw(Graphics graphics, Size size, Pen pen)
      {
         Autodesk.Revit.DB.UV delta = m_box.Max - m_box.Min;
         float scaleX = size.Width / (float)delta.U;
         float scaleY = size.Width / (float)delta.V;
         float scale = scaleY > scaleX ? scaleX : scaleY;
         scale *= 0.90f;

         GraphicsContainer contain = graphics.BeginContainer();
         {
            //set graphics coordinate system to picture center
            //and  flip the yAxis.
            graphics.Transform = new Matrix(1, 0, 0, -1, size.Width / 2, size.Height / 2);

            //construct a matrix to transform the origin point to Bound center.
            Autodesk.Revit.DB.UV center = (m_box.Min + m_box.Max) / 2;
            Matrix toCenter = new Matrix(1, 0, 0, 1, -(float)center.U, -(float)center.V);

            bool isDrawFinished = false;
            List<List<UV>> point2d = m_point2d;
            Pen tmpPen = pen;

            while (!isDrawFinished)
            {
               foreach (List<UV> arr in point2d)
               {
                  for (int i = 0; i < arr.Count - 1; i++)
                  {
                     //get the two connection points to draw a line between them.
                     Autodesk.Revit.DB.UV uv1 = arr[i];
                     Autodesk.Revit.DB.UV uv2 = arr[i + 1];
                     PointF[] points = new PointF[] { 
                            new PointF((float)uv1.U, (float)uv1.V), 
                            new PointF((float)uv2.U, (float)uv2.V) };

                     //transform points to bound center.
                     toCenter.TransformPoints(points);

                     //Zoom(Scale) the points to fit the picture box.
                     PointF pf1 = new PointF(points[0].X * scale, points[0].Y * scale);
                     PointF pf2 = new PointF(points[1].X * scale, points[1].Y * scale);

                     //draw a line between pf1 and pf2.
                     graphics.DrawLine(tmpPen, pf1, pf2);
                  }
               }
               if (point2d == m_path2d)
               {
                  isDrawFinished = true;
               }
               point2d = m_path2d;
               tmpPen = Pens.Blue;
            }
         }
         graphics.EndContainer(contain);
      }

      /// <summary>
      /// Transform 3d path to 2d path.
      /// </summary>
      /// <returns></returns>
      private void ComputePathTo2D()
      {
         Matrix4 transform = GetActiveViewMatrix().Inverse();
         foreach (List<XYZ> arr in m_path)
         {
            List<UV> uvarr = new List<UV>();
            foreach (Autodesk.Revit.DB.XYZ xyz in arr)
            {
               Vector4 tmpVector = transform.Transform(new Vector4(xyz));
               Autodesk.Revit.DB.UV tmpUv = new Autodesk.Revit.DB.UV(
                   tmpVector.X,
                   tmpVector.Y);
               uvarr.Add(tmpUv);
            }
            m_path2d.Add(uvarr);
         }
      }

      /// <summary>
      /// Compute the bound of the curves of path reinforcement.
      /// </summary>
      private void ComputeBound()
      {
         //make the bound
         Autodesk.Revit.DB.UV min = m_box.get_Bounds(0);
         Autodesk.Revit.DB.UV max = m_box.get_Bounds(1);

         Matrix4 transform = GetActiveViewMatrix().Inverse();

         bool isFirst = true;
         foreach (List<XYZ> arr in m_curves)
         {
            List<UV> uvarr = new List<UV>();
            foreach (Autodesk.Revit.DB.XYZ xyz in arr)
            {
               Vector4 tmpVector = transform.Transform(new Vector4(xyz));
               Autodesk.Revit.DB.UV tmpUv = new Autodesk.Revit.DB.UV(
                   tmpVector.X,
                   tmpVector.Y);
               uvarr.Add(tmpUv);

               if (isFirst)
               {
                  isFirst = false;
                  min = new UV(tmpUv.U, tmpUv.V);
                  max = new UV(tmpUv.U, tmpUv.V);
               }
               if (tmpUv.U < min.U)
               {
                  min = new UV(tmpUv.U, min.V);
               }
               else if (tmpUv.U > max.U)
               {
                  max = new UV(tmpUv.U, max.V);
               }
               if (tmpUv.V < min.V)
               {
                  min = new UV(min.U, tmpUv.V);
               }
               else if (tmpUv.V > max.V)
               {
                  max = new UV(max.U, tmpUv.V);
               }
            }
            m_point2d.Add(uvarr);
         }
         m_box.Min = min;
         m_box.Max = max;
      }

      /// <summary>
      /// Tessellate the curves of path reinforcement.
      /// </summary>
      private void Tessellate()
      {
         Options option = new Options();
         option.DetailLevel = ViewDetailLevel.Fine;
         Autodesk.Revit.DB.GeometryElement geoElem = m_pathRein.get_Geometry(option);
         //GeometryObjectArray geoArray = geoElem.Objects;
         IEnumerator<GeometryObject> Objects = geoElem.GetEnumerator();
         //foreach (GeometryObject geo in geoArray)
         while (Objects.MoveNext())
         {
            GeometryObject geo = Objects.Current;

            if (geo is Curve)
            {
               Curve curve = geo as Curve;
               m_curves.Add(curve.Tessellate() as List<XYZ>);
            }
         }

         IList<ElementId> curveIds = m_pathRein.GetCurveElementIds();

         foreach (ElementId id in curveIds)
         {
            ModelCurve modelCurve = m_commandData.Application.ActiveUIDocument.Document.GetElement(id) as ModelCurve;
            m_path.Add(modelCurve.GeometryCurve.Tessellate() as List<XYZ>);
         }
      }

      /// <summary>
      /// Get view matrix from active view.
      /// </summary>
      /// <returns>view matrix</returns>
      private Matrix4 GetActiveViewMatrix()
      {
         View activeView = m_commandData.Application.ActiveUIDocument.Document.ActiveView;
         Autodesk.Revit.DB.XYZ vZAxis = activeView.ViewDirection;
         Autodesk.Revit.DB.XYZ vXAxis = activeView.RightDirection;
         Autodesk.Revit.DB.XYZ vYAxis = activeView.UpDirection;

         return new Matrix4(new Vector4(vXAxis), new Vector4(vYAxis), new Vector4(vZAxis));
      }

      protected virtual void Dispose(bool disposing)
      {
         if (disposing)
         {
            if (m_box != null)
               m_box.Dispose();
         }
      }

      public void Dispose()
      {
         Dispose(disposing: true);
         GC.SuppressFinalize(this);
      }
   }
}