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

//
// (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 Autodesk.Revit.DB;

    /// <summary>
    /// sketch line and any tag on it
    /// </summary>
    public class LineSketch : ObjectSketch
    {        
        /// <summary>
        /// the rate of direction tag's distance to the line
        /// </summary>
        private const float DirectionTag_Distance_Ratio = 0.02f;
        /// <summary>
        /// the rate of direction tag's length to the line
        /// </summary>
        private const float DirectionTag_Length_Ratio = 0.1f;
        private Line2D m_line = new Line2D();    // geometry line to draw
        private bool m_isDirection;                // whether has direction tag

        /// <summary>
        /// whether has direction tag
        /// </summary>
        public bool IsDirection
        {
            get 
            {
                return m_isDirection;
            }
            set 
            { 
                m_isDirection = value; 
            }
        }

        /// <summary>
        /// constructor
        /// </summary>
        /// <param name="line"></param>
        public LineSketch(Line2D line)
        {
            m_line        = line;
            m_boundingBox = line.BoundingBox;
            m_pen.Color   = System.Drawing.Color.DarkGreen;
            m_pen.Width   = 1f;
        }

        /// <summary>
        /// draw the line
        /// </summary>
        /// <param name="g">drawing object</param>
        /// <param name="translate">translation between drawn sketch and geometry object</param>
        public override void Draw(Graphics g, Matrix translate)
        {
            GraphicsPath path = new GraphicsPath();
            path.AddLine(m_line.StartPnt, m_line.EndPnt);

            if (m_isDirection)
            {
                DrawDirectionTag(path);
            }

            path.Transform(translate);
            g.DrawPath(m_pen, path);
        }

        /// <summary>
        /// draw 2 shorter parallel lines on each side of the line
        /// </summary>
        /// <param name="path"></param>
        private void DrawDirectionTag(GraphicsPath path)
        {
            Line2D leftLine  = m_line.Clone();
            Line2D rightLine = m_line.Clone();
            leftLine.Scale(DirectionTag_Length_Ratio);
            leftLine.Shift(DirectionTag_Distance_Ratio * m_line.Length);
            rightLine.Scale(DirectionTag_Length_Ratio);
            rightLine.Shift(-DirectionTag_Distance_Ratio * m_line.Length);
            GraphicsPath leftPath = new GraphicsPath();
            leftPath.AddLine(leftLine.StartPnt, leftLine.EndPnt);
            GraphicsPath rightPath = new GraphicsPath();
            rightPath.AddLine(rightLine.StartPnt, rightLine.EndPnt);
            path.AddPath(leftPath, false);
            path.AddPath(rightPath, false);
        }
    }
}