添加项目文件。

RevitTools.DrawTool/LineObj.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Drawing;
+
+namespace RevitTools.DrawTool
+{
+    public class LineObj : DrawBase
+    {
+        protected Point m_Start;
+        protected Point m_End;
+
+        public LineObj(Point start, Point end)
+        {
+            this.m_Start = start;
+            this.m_End = end;
+        }
+
+        /// <summary>
+        /// 获取图形外接矩形
+        /// </summary>
+        /// <returns>图形的外接矩形</returns>
+        public override Rectangle GetBound()
+        {
+            int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X;
+            int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y;
+            int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X;
+            int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y;
+            return Rectangle.FromLTRB(x, y, r, b);
+        }
+
+        /// <summary>
+        /// 在指定的Graphics上绘制图形
+        /// </summary>
+        /// <param name="g">指定的 Graphics</param>
+        public override void Draw(Graphics g)
+        {
+            using (Pen pen = new Pen(this.m_ForeColor))
+            {
+                g.DrawLine(pen, this.m_Start, this.m_End);
+            }
+        }
+
+        public override void Move(int dx, int dy)
+        {
+            m_Start.X += dx;
+            m_Start.Y += dy;
+
+            m_End.X += dx;
+            m_End.Y += dy;
+        }
+    }
+}