assets/samples/Samples/CreateBeamSystem/CS/BeamSystemSketch.cs

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// (C) Copyright 2003-2019 by Autodesk, Inc.
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namespace Revit.SDK.Samples.CreateBeamSystem.CS
{
   using System;
   using System.Collections.Generic;
   using System.Text;
   using System.Drawing;
   using System.Drawing.Drawing2D;
   using System.Windows.Forms;

   using Autodesk.Revit.DB;

   /// <summary>
   /// Sketch the profile of beam system on canvas
   /// Code here have nothing with Revit API
   /// </summary>
   public class BeamSystemSketch : ObjectSketch
   {
      /// <summary>
      /// ratio of margin to canvas width
      /// </summary>
      private const float MarginRatio = 0.1f;

      /// <summary>
      /// the control to draw beam system
      /// </summary>
      private System.Windows.Forms.Control m_canvas;

      /// <summary>
      /// defines a local geometric inverse transform
      /// </summary>
      private Matrix m_inverse;

      /// <summary>
      /// constructor
      /// </summary>
      /// <param name="canvas">the control to draw beam system</param>
      public BeamSystemSketch(System.Windows.Forms.Control canvas)
      {
         m_canvas = canvas;
      }

      /// <summary>
      /// draw the profile in the canvas
      /// </summary>
      /// <param name="profile">the profile of the beam system</param>
      public void DrawProfile(IList<Line> profile)
      {
         Initialize(profile);
         CalculateTransform();
         m_canvas.Paint += new PaintEventHandler(this.Paint);
         m_canvas.Refresh();
      }

      /// <summary>
      /// draw beam system
      /// </summary>
      /// <param name="g">encapsulates a GDI+ drawing surface</param>
      /// <param name="translate">translation matrix to canvas coordinates</param>
      public override void Draw(Graphics g, Matrix translate)
      {
         foreach (LineSketch sketch in m_objects)
         {
            sketch.Draw(g, m_transform);
         }
      }

      /// <summary>
      /// draw beam system on canvas control
      /// </summary>
      /// <param name="sender">canvas control</param>
      /// <param name="e">data for the Paint event</param>
      protected void Paint(Object sender, PaintEventArgs e)
      {
         Graphics g = e.Graphics;
         g.Clear(System.Drawing.Color.White);
         Draw(g, m_transform);
      }

      /// <summary>
      /// generate a Line2D instance using a Line's data
      /// </summary>
      /// <param name="line">where new Line2D get data</param>
      /// <returns>new Line2D</returns>
      private static Line2D GetLine2D(Line line)
      {
         Line2D result = new Line2D();
         result.StartPnt = new PointF((float)line.GetEndPoint(0).X, (float)line.GetEndPoint(0).Y);
         result.EndPnt = new PointF((float)line.GetEndPoint(1).X, (float)line.GetEndPoint(1).Y);
         return result;
      }

      /// <summary>
      /// calculate the transform between canvas and geometry objects
      /// </summary>
      private void CalculateTransform()
      {
         PointF[] plgpts = CalculateCanvasRegion();
         m_transform = new Matrix(BoundingBox, plgpts);
         m_inverse = m_transform.Clone();

         if (m_inverse.IsInvertible)
         {
            m_inverse.Invert();
         }
      }

      /// <summary>
      /// initialize geometry objects and bounding box
      /// </summary>
      /// <param name="profile">the profile of the beam system</param>
      private void Initialize(IList<Line> profile)
      {
         // deal with first line in profile
         m_objects.Clear();
         LineSketch firstSketch = new LineSketch(GetLine2D(profile[0]));
         m_boundingBox = firstSketch.BoundingBox;
         firstSketch.IsDirection = true;
         m_objects.Add(firstSketch);

         // all other lines
         for (int i = 1; i < profile.Count; i++)
         {
            LineSketch sketch = new LineSketch(GetLine2D(profile[i]));
            m_boundingBox = RectangleF.Union(BoundingBox, sketch.BoundingBox);
            m_objects.Add(sketch);
         }
      }

      /// <summary>
      /// get the display region, adjust the proportion and location
      /// </summary>
      /// <returns>upper-left, upper-right, and lower-left corners of the rectangle </returns>
      private PointF[] CalculateCanvasRegion()
      {
         // get the area without margin
         float realWidth = m_canvas.Width * (1 - 2 * MarginRatio);
         float realHeight = m_canvas.Height * (1 - 2 * MarginRatio);
         float minX = m_canvas.Width * MarginRatio;
         float minY = m_canvas.Height * MarginRatio;
         // ratio of width to height
         float originRate = m_boundingBox.Width / m_boundingBox.Height;
         float displayRate = realWidth / realHeight;

         if (originRate > displayRate)
         {
            // display area in canvas need move to center in height
            float goalHeight = realWidth / originRate;
            minY = minY + (realHeight - goalHeight) / 2;
            realHeight = goalHeight;
         }
         else
         {
            // display area in canvas need move to center in width
            float goalWidth = realHeight * originRate;
            minX = minX + (realWidth - goalWidth) / 2;
            realWidth = goalWidth;
         }

         PointF[] plgpts = new PointF[3];
         plgpts[0] = new PointF(minX, realHeight + minY);                // upper-left point    
         plgpts[1] = new PointF(realWidth + minX, realHeight + minY);    // upper-right point
         plgpts[2] = new PointF(minX, minY);                                // lower-left point

         return plgpts;
      }

      protected override void Dispose(bool disposing)
      {
         if (disposing)
         {
            if (m_inverse != null)
               m_inverse.Dispose();
         }
      }
   }
}