diff --git a/DeepNestLib/NFP.cs b/DeepNestLib/NFP.cs
index 30aa069..6d0e946 100644
--- a/DeepNestLib/NFP.cs
+++ b/DeepNestLib/NFP.cs
@@ -31,7 +31,7 @@ public NFP()
     {
       this.points = new SvgPoint[0];
     }
-
+        
     public NFP(IEnumerable<SvgPoint> points)
     {
       this.points = points.DeepClone();
diff --git a/DeepNestLib/NestingContext.cs b/DeepNestLib/NestingContext.cs
index a2b62da..f5518fa 100644
--- a/DeepNestLib/NestingContext.cs
+++ b/DeepNestLib/NestingContext.cs
@@ -323,49 +323,15 @@ public void LoadInputData(string path, int count)
 
     public bool TryImportFromRawDetail(RawDetail raw, int src, out NFP loadedNfp)
     {
-      NFP po = null;
-      List<NFP> nfps = new List<NFP>();
-      foreach (var item in raw.Outers)
+      loadedNfp = raw.ToNfp();
+      if (loadedNfp == null)
       {
-        var nn = new NFP();
-        nfps.Add(nn);
-        foreach (var pitem in item.Points)
-        {
-          nn.AddPoint(new SvgPoint(pitem.X, pitem.Y));
-        }
-      }
-
-      if (nfps.Any())
-      {
-        var tt = nfps.OrderByDescending(z => z.Area).First();
-        po = tt; // Reference caution needed here; should be cloning not messing with the original object?
-        po.Name = raw.Name;
-
-        foreach (var r in nfps)
-        {
-          if (r == tt)
-          {
-            continue;
-          }
-
-          if (po.Children == null)
-          {
-            po.Children = new List<NFP>();
-          }
-
-          po.Children.Add(r);
-        }
-
-        po.Source = src;
-        Polygons.Add(po);
-        loadedNfp = po;
-        return true;
-      }
-      else
-      {
-        loadedNfp = null;
         return false;
       }
+
+      loadedNfp.Source = src;
+      Polygons.Add(loadedNfp);
+      return true;
     }
 
     public int GetNextSource()
@@ -376,6 +342,7 @@ public int GetNextSource()
       }
       return 0;
     }
+
     public int GetNextSheetSource()
     {
       if (Sheets.Any())
diff --git a/DeepNestLib/RawDetail.cs b/DeepNestLib/RawDetail.cs
index 7022f37..79044f4 100644
--- a/DeepNestLib/RawDetail.cs
+++ b/DeepNestLib/RawDetail.cs
@@ -1,12 +1,64 @@
 namespace DeepNestLib
 {
-    using System.Collections.Generic;
+  using System.Collections.Generic;
+  using System.Drawing;
+  using System.Drawing.Drawing2D;
+  using System.Linq;
 
-    public class RawDetail
+  public class RawDetail
+  {
+    public List<LocalContour> Outers = new List<LocalContour>();
+    public List<LocalContour> Holes = new List<LocalContour>();
+
+    public RectangleF BoundingBox()
     {
-        public List<LocalContour> Outers = new List<LocalContour>();
-        public List<LocalContour> Holes = new List<LocalContour>();
+      GraphicsPath gp = new GraphicsPath();
+      foreach (var item in Outers)
+      {
+        gp.AddPolygon(item.Points.ToArray());
+      }
+
+      return gp.GetBounds();
+    }
+
+    public string Name { get; set; }
+
+    public NFP ToNfp()
+    {
+      NFP po = null;
+      List<NFP> nfps = new List<NFP>();
+      foreach (var item in this.Outers)
+      {
+        var nn = new NFP();
+        nfps.Add(nn);
+        foreach (var pitem in item.Points)
+        {
+          nn.AddPoint(new SvgPoint(pitem.X, pitem.Y));
+        }
+      }
+
+      if (nfps.Any())
+      {
+        var tt = nfps.OrderByDescending(z => z.Area).First();
+        po = tt; // Reference caution needed here; should be cloning not messing with the original object?
+        po.Name = Name;
+
+        foreach (var r in nfps)
+        {
+          if (r == tt)
+          {
+            continue;
+          }
+
+          if (po.Children == null)
+          {
+            po.Children = new List<NFP>();
+          }
+          po.Children.Add(r);
+        }
+      }
 
-        public string Name { get; set; }
+      return po;
     }
-}
+  }
+}
\ No newline at end of file
diff --git a/DeepNestLib/SvgNestConfig.cs b/DeepNestLib/SvgNestConfig.cs
index 5dbbb14..342d950 100644
--- a/DeepNestLib/SvgNestConfig.cs
+++ b/DeepNestLib/SvgNestConfig.cs
@@ -11,6 +11,9 @@ public class SvgNestConfig
     public double TimeRatio = 0.5;
     public bool MergeLines = false;
 
+    // port features (don't exist in the original DeepNest project)
+    public bool clipByHull = false;
+
     public double CurveTolerance
     {
       get
diff --git a/DeepNestPort/DrawingContext.cs b/DeepNestPort/DrawingContext.cs
index e93e5e8..6de4036 100644
--- a/DeepNestPort/DrawingContext.cs
+++ b/DeepNestPort/DrawingContext.cs
@@ -1,4 +1,5 @@
-using System;
+using DeepNestLib;
+using System;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Linq;
@@ -6,152 +7,229 @@
 
 namespace DeepNestPort
 {
-    public class DrawingContext
+  public class DrawingContext
+  {
+    public DrawingContext(PictureBox pb)
     {
-        public DrawingContext(PictureBox pb)
+      box = pb;
+
+      bmp = new Bitmap(pb.Width, pb.Height);
+      pb.SizeChanged += Pb_SizeChanged;
+      gr = Graphics.FromImage(bmp);
+      gr.SmoothingMode = SmoothingMode.AntiAlias;
+      box.Image = bmp;
+
+      pb.MouseDown += PictureBox1_MouseDown;
+      pb.MouseUp += PictureBox1_MouseUp;
+      pb.MouseMove += Pb_MouseMove;
+      sx = box.Width / 2;
+      sy = -box.Height / 2;
+      pb.MouseWheel += Pb_MouseWheel;
+    }
+
+    GraphicsPath GetGraphicsPath(NFP nfp)
+    {
+      GraphicsPath gp = new GraphicsPath();
+      gp.AddPolygon(nfp.Points.Select(z => Transform(z.x, z.y)).ToArray());
+      if (nfp.Children != null)
+      {
+        foreach (var item in nfp.Children)
         {
-            box = pb;
-
-            bmp = new Bitmap(pb.Width, pb.Height);
-            pb.SizeChanged += Pb_SizeChanged;
-            gr = Graphics.FromImage(bmp);
-            gr.SmoothingMode = SmoothingMode.AntiAlias;
-            box.Image = bmp;
-
-            pb.MouseDown += PictureBox1_MouseDown;
-            pb.MouseUp += PictureBox1_MouseUp;
-            pb.MouseMove += Pb_MouseMove;
-            sx = box.Width / 2;
-            sy = -box.Height / 2;
-            pb.MouseWheel += Pb_MouseWheel;
+          gp.AddPolygon(item.Points.Select(z => Transform(z.x, z.y)).ToArray());
         }
+      }
 
-        private void Pb_MouseWheel(object sender, MouseEventArgs e)
-        {
-            float zold = zoom;
-            if (e.Delta > 0) { zoom *= 1.5f; ; }
-            else { zoom *= 0.5f; }
-            if (zoom < 0.08) { zoom = 0.08f; }
-            if (zoom > 1000) { zoom = 1000f; }
+      return gp;
+    }
 
-            var pos = box.PointToClient(Cursor.Position);
+    GraphicsPath GetGraphicsPath(RawDetail det)
+    {
+      GraphicsPath gp = new GraphicsPath();
+      foreach (var item in det.Outers)
+      {
+        gp.AddPolygon(item.Points.Select(z => Transform(z)).ToArray());
+      }
 
-            sx = -(pos.X / zold - sx - pos.X / zoom);
-            sy = (pos.Y / zold + sy - pos.Y / zoom);
-        }
+      return gp;
+    }
 
-        public bool FocusOnMove = true;
-        private void Pb_MouseMove(object sender, MouseEventArgs e)
-        {
-            if (!FocusOnMove) return;
-            box.Focus();
-        }
+    public float GetLabelHeight()
+    {
+      return SystemFonts.DefaultFont.GetHeight();
+    }
 
-        private void PictureBox1_MouseUp(object sender, MouseEventArgs e)
-        {
-            isDrag = false;
+    public SizeF DrawLabel(string text, Brush fontBrush, Color backColor, int x, int y, int opacity = 128)
+    {
+      var ms = this.gr.MeasureString(text, SystemFonts.DefaultFont);
+      this.gr.FillRectangle(new SolidBrush(Color.FromArgb(opacity, backColor)), x, y, ms.Width, ms.Height);
+      this.gr.DrawString(text, SystemFonts.DefaultFont, fontBrush, x, y);
+      return ms;
+    }
 
-            var p = box.PointToClient(Cursor.Position);
-            var pos = box.PointToClient(Cursor.Position);
-            var posx = (pos.X / zoom - sx);
-            var posy = (-pos.Y / zoom - sy);
-        }
+    public GraphicsPath Draw(NFP nfp, Pen pen = null, Brush brush = null)
+    {
+      var gp = GetGraphicsPath(nfp);
+      if (brush != null)
+      {
+        this.gr.FillPath(brush, gp);
+      }
+
+      if (pen != null)
+      {
+        this.gr.DrawPath(pen, gp);
+      }
+
+      return gp;
+    }
 
-        private void PictureBox1_MouseDown(object sender, MouseEventArgs e)
-        {
-            var pos = box.PointToClient(Cursor.Position);
-            var p = Transform(pos);
-
-            if (e.Button == MouseButtons.Right)
-            {
-                isDrag = true;
-                startx = pos.X;
-                starty = pos.Y;
-                origsx = sx;
-                origsy = sy;
-            }
-        }
-        float startx, starty;
-        float origsx, origsy;
-        bool isDrag = false;
-
-        PictureBox box;
-        public float sx, sy;
-        public float zoom = 1;
-        public Graphics gr;
-        public Bitmap bmp;
-        public bool InvertY = true;
-        public virtual PointF Transform(PointF p1)
-        {
-            return new PointF((p1.X + sx) * zoom, (InvertY ? (-1) : 1) * (p1.Y + sy) * zoom);
-        }
-        public virtual PointF Transform(double x, double y)
-        {
-            return new PointF(((float)(x) + sx) * zoom, (InvertY ? (-1) : 1) * ((float)(y) + sy) * zoom);
-        }
+    public GraphicsPath Draw(RawDetail det, Pen pen = null, Brush brush = null)
+    {
+      var gp = GetGraphicsPath(det);
+      if (brush != null)
+        gr.FillPath(brush, gp);
+      if (pen != null)
+        gr.DrawPath(pen, gp);
+      return gp;
+    }
 
+    private void Pb_MouseWheel(object sender, MouseEventArgs e)
+    {
+      float zold = zoom;
+      if (e.Delta > 0) { zoom *= 1.5f; ; }
+      else { zoom *= 0.5f; }
+      if (zoom < 0.08) { zoom = 0.08f; }
+      if (zoom > 1000) { zoom = 1000f; }
 
-        private void Pb_SizeChanged(object sender, EventArgs e)
-        {
-            bmp = new Bitmap(box.Width, box.Height);
-            gr = Graphics.FromImage(bmp);
+      var pos = box.PointToClient(Cursor.Position);
 
-            box.Image = bmp;
-        }
+      sx = -(pos.X / zold - sx - pos.X / zoom);
+      sy = (pos.Y / zold + sy - pos.Y / zoom);
+    }
 
-        public PointF GetPos()
-        {
-            var pos = box.PointToClient(Cursor.Position);
-            var posx = (pos.X / zoom - sx);
-            var posy = (-pos.Y / zoom - sy);
+    public bool FocusOnMove = true;
+    private void Pb_MouseMove(object sender, MouseEventArgs e)
+    {
+      if (!FocusOnMove) return;
+      box.Focus();
+    }
 
-            return new PointF(posx, posy);
-        }
-        public void Update()
-        {
-            if (isDrag)
-            {
-                var p = box.PointToClient(Cursor.Position);
+    private void PictureBox1_MouseUp(object sender, MouseEventArgs e)
+    {
+      isDrag = false;
 
-                sx = origsx + ((p.X - startx) / zoom);
-                sy = origsy + (-(p.Y - starty) / zoom);
-            }
-        }
+      var p = box.PointToClient(Cursor.Position);
+      var pos = box.PointToClient(Cursor.Position);
+      var posx = (pos.X / zoom - sx);
+      var posy = (-pos.Y / zoom - sy);
+    }
 
-        public void Setup()
-        {
-            box.Invalidate();
-        }
+    private void PictureBox1_MouseDown(object sender, MouseEventArgs e)
+    {
+      var pos = box.PointToClient(Cursor.Position);
+      var p = Transform(pos);
+
+      if (e.Button == MouseButtons.Right)
+      {
+        isDrag = true;
+        startx = pos.X;
+        starty = pos.Y;
+        origsx = sx;
+        origsy = sy;
+      }
+    }
 
-        public void FitToPoints(PointF[] points, int gap = 0)
-        {
-            var maxx = points.Max(z => z.X) + gap;
-            var minx = points.Min(z => z.X) - gap;
-            var maxy = points.Max(z => z.Y) + gap;
-            var miny = points.Min(z => z.Y) - gap;
+    internal void Clear(Color color)
+    {
+      gr.Clear(color);
+    }
+
+    float startx, starty;
 
-            var w = box.Width;
-            var h = box.Height;
+    internal void Reset()
+    {
+      gr.ResetTransform();
+    }
 
-            var dx = maxx - minx;
-            var kx = w / dx;
-            var dy = maxy - miny;
-            var ky = h / dy;
+    float origsx, origsy;
+    bool isDrag = false;
 
-            var oz = zoom;
-            var sz1 = new Size((int)(dx * kx), (int)(dy * kx));
-            var sz2 = new Size((int)(dx * ky), (int)(dy * ky));
-            zoom = kx;
-            if (sz1.Width > w || sz1.Height > h) zoom = ky;
+    PictureBox box;
+    public float sx, sy;
+    public float zoom = 1;
+    public Graphics gr;
+    public Bitmap bmp;
+    public bool InvertY = true;
+    public virtual PointF Transform(PointF p1)
+    {
+      return new PointF((p1.X + sx) * zoom, (InvertY ? (-1) : 1) * (p1.Y + sy) * zoom);
+    }
+    public virtual PointF Transform(double x, double y)
+    {
+      return new PointF(((float)(x) + sx) * zoom, (InvertY ? (-1) : 1) * ((float)(y) + sy) * zoom);
+    }
 
-            var x = dx / 2 + minx;
-            var y = dy / 2 + miny;
 
-            sx = ((w / 2f) / zoom - x);
-            sy = -((h / 2f) / zoom + y);
+    private void Pb_SizeChanged(object sender, EventArgs e)
+    {
+      bmp = new Bitmap(box.Width, box.Height);
+      gr = Graphics.FromImage(bmp);
 
-            var test = Transform(new PointF(x, y));
+      box.Image = bmp;
+    }
+
+    public PointF GetPos()
+    {
+      var pos = box.PointToClient(Cursor.Position);
+      var posx = (pos.X / zoom - sx);
+      var posy = (-pos.Y / zoom - sy);
+
+      return new PointF(posx, posy);
+    }
+    public void Update()
+    {
+      if (isDrag)
+      {
+        var p = box.PointToClient(Cursor.Position);
+
+        sx = origsx + ((p.X - startx) / zoom);
+        sy = origsy + (-(p.Y - starty) / zoom);
+      }
+    }
+
+    public void Setup()
+    {
+      box.Invalidate();
+    }
+
+    public void FitToPoints(PointF[] points, int gap = 0)
+    {
+      var maxx = points.Max(z => z.X) + gap;
+      var minx = points.Min(z => z.X) - gap;
+      var maxy = points.Max(z => z.Y) + gap;
+      var miny = points.Min(z => z.Y) - gap;
+
+      var w = box.Width;
+      var h = box.Height;
+
+      var dx = maxx - minx;
+      var kx = w / dx;
+      var dy = maxy - miny;
+      var ky = h / dy;
+
+      var oz = zoom;
+      var sz1 = new Size((int)(dx * kx), (int)(dy * kx));
+      var sz2 = new Size((int)(dx * ky), (int)(dy * ky));
+      zoom = kx;
+      if (sz1.Width > w || sz1.Height > h) zoom = ky;
+
+      var x = dx / 2 + minx;
+      var y = dy / 2 + miny;
+
+      sx = ((w / 2f) / zoom - x);
+      sy = -((h / 2f) / zoom + y);
+
+      var test = Transform(new PointF(x, y));
 
-        }
     }
+  }
 }
diff --git a/DeepNestPort/Form1.Designer.cs b/DeepNestPort/Form1.Designer.cs
index a0a1dfe..17c7002 100644
--- a/DeepNestPort/Form1.Designer.cs
+++ b/DeepNestPort/Form1.Designer.cs
@@ -1,33 +1,33 @@
 namespace DeepNestPort
 {
-    partial class Form1
-    {
-        /// <summary>
-        /// Required designer variable.
-        /// </summary>
-        private System.ComponentModel.IContainer components = null;
+  partial class Form1
+  {
+    /// <summary>
+    /// Required designer variable.
+    /// </summary>
+    private System.ComponentModel.IContainer components = null;
 
-        /// <summary>
-        /// Clean up any resources being used.
-        /// </summary>
-        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
-        protected override void Dispose(bool disposing)
-        {
-            if (disposing && (components != null))
-            {
-                components.Dispose();
-            }
-            base.Dispose(disposing);
-        }
+    /// <summary>
+    /// Clean up any resources being used.
+    /// </summary>
+    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+    protected override void Dispose(bool disposing)
+    {
+      if (disposing && (components != null))
+      {
+        components.Dispose();
+      }
+      base.Dispose(disposing);
+    }
 
-        #region Windows Form Designer generated code
+    #region Windows Form Designer generated code
 
-        /// <summary>
-        /// Required method for Designer support - do not modify
-        /// the contents of this method with the code editor.
-        /// </summary>
-        private void InitializeComponent()
-        {
+    /// <summary>
+    /// Required method for Designer support - do not modify
+    /// the contents of this method with the code editor.
+    /// </summary>
+    private void InitializeComponent()
+    {
       this.components = new System.ComponentModel.Container();
       System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
       this.pictureBox1 = new System.Windows.Forms.PictureBox();
@@ -58,6 +58,7 @@ private void InitializeComponent()
       this.toolStripButton4 = new System.Windows.Forms.ToolStripButton();
       this.toolStripButton6 = new System.Windows.Forms.ToolStripButton();
       this.tabPage2 = new System.Windows.Forms.TabPage();
+      this.checkBox5 = new System.Windows.Forms.CheckBox();
       this.label2 = new System.Windows.Forms.Label();
       this.textBox6 = new System.Windows.Forms.TextBox();
       this.groupBox8 = new System.Windows.Forms.GroupBox();
@@ -153,6 +154,8 @@ private void InitializeComponent()
       this.timer1 = new System.Windows.Forms.Timer(this.components);
       this.statusStrip1 = new System.Windows.Forms.StatusStrip();
       this.toolStripStatusLabel1 = new System.Windows.Forms.ToolStripStatusLabel();
+      this.groupBox9 = new System.Windows.Forms.GroupBox();
+      this.checkBox6 = new System.Windows.Forms.CheckBox();
       ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
       this.tabControl1.SuspendLayout();
       this.tabPage3.SuspendLayout();
@@ -191,6 +194,7 @@ private void InitializeComponent()
       ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit();
       this.tabPage5.SuspendLayout();
       this.statusStrip1.SuspendLayout();
+      this.groupBox9.SuspendLayout();
       this.SuspendLayout();
       // 
       // pictureBox1
@@ -397,19 +401,19 @@ private void InitializeComponent()
             this.deleteToolStripMenuItem2,
             this.quantityToolStripMenuItem});
       this.contextMenuStrip4.Name = "contextMenuStrip4";
-      this.contextMenuStrip4.Size = new System.Drawing.Size(133, 76);
+      this.contextMenuStrip4.Size = new System.Drawing.Size(119, 70);
       // 
       // clearToolStripMenuItem
       // 
       this.clearToolStripMenuItem.Name = "clearToolStripMenuItem";
-      this.clearToolStripMenuItem.Size = new System.Drawing.Size(132, 24);
+      this.clearToolStripMenuItem.Size = new System.Drawing.Size(118, 22);
       this.clearToolStripMenuItem.Text = "clear";
       this.clearToolStripMenuItem.Click += new System.EventHandler(this.clearToolStripMenuItem_Click);
       // 
       // deleteToolStripMenuItem2
       // 
       this.deleteToolStripMenuItem2.Name = "deleteToolStripMenuItem2";
-      this.deleteToolStripMenuItem2.Size = new System.Drawing.Size(132, 24);
+      this.deleteToolStripMenuItem2.Size = new System.Drawing.Size(118, 22);
       this.deleteToolStripMenuItem2.Text = "delete";
       this.deleteToolStripMenuItem2.Click += new System.EventHandler(this.deleteToolStripMenuItem2_Click);
       // 
@@ -420,27 +424,27 @@ private void InitializeComponent()
             this.multiplyToolStripMenuItem,
             this.divideToolStripMenuItem});
       this.quantityToolStripMenuItem.Name = "quantityToolStripMenuItem";
-      this.quantityToolStripMenuItem.Size = new System.Drawing.Size(132, 24);
+      this.quantityToolStripMenuItem.Size = new System.Drawing.Size(118, 22);
       this.quantityToolStripMenuItem.Text = "quantity";
       // 
       // setToToolStripMenuItem
       // 
       this.setToToolStripMenuItem.Name = "setToToolStripMenuItem";
-      this.setToToolStripMenuItem.Size = new System.Drawing.Size(146, 26);
+      this.setToToolStripMenuItem.Size = new System.Drawing.Size(118, 22);
       this.setToToolStripMenuItem.Text = "set to";
       this.setToToolStripMenuItem.Click += new System.EventHandler(this.setToToolStripMenuItem_Click);
       // 
       // multiplyToolStripMenuItem
       // 
       this.multiplyToolStripMenuItem.Name = "multiplyToolStripMenuItem";
-      this.multiplyToolStripMenuItem.Size = new System.Drawing.Size(146, 26);
+      this.multiplyToolStripMenuItem.Size = new System.Drawing.Size(118, 22);
       this.multiplyToolStripMenuItem.Text = "multiply";
       this.multiplyToolStripMenuItem.Click += new System.EventHandler(this.multiplyToolStripMenuItem_Click);
       // 
       // divideToolStripMenuItem
       // 
       this.divideToolStripMenuItem.Name = "divideToolStripMenuItem";
-      this.divideToolStripMenuItem.Size = new System.Drawing.Size(146, 26);
+      this.divideToolStripMenuItem.Size = new System.Drawing.Size(118, 22);
       this.divideToolStripMenuItem.Text = "divide";
       this.divideToolStripMenuItem.Click += new System.EventHandler(this.divideToolStripMenuItem_Click);
       // 
@@ -478,6 +482,8 @@ private void InitializeComponent()
       // 
       // tabPage2
       // 
+      this.tabPage2.Controls.Add(this.groupBox9);
+      this.tabPage2.Controls.Add(this.checkBox5);
       this.tabPage2.Controls.Add(this.label2);
       this.tabPage2.Controls.Add(this.textBox6);
       this.tabPage2.Controls.Add(this.groupBox8);
@@ -505,6 +511,17 @@ private void InitializeComponent()
       this.tabPage2.Text = "Settings";
       this.tabPage2.UseVisualStyleBackColor = true;
       // 
+      // checkBox5
+      // 
+      this.checkBox5.AutoSize = true;
+      this.checkBox5.Location = new System.Drawing.Point(389, 11);
+      this.checkBox5.Name = "checkBox5";
+      this.checkBox5.Size = new System.Drawing.Size(111, 17);
+      this.checkBox5.TabIndex = 31;
+      this.checkBox5.Text = "simplification draw";
+      this.checkBox5.UseVisualStyleBackColor = true;
+      this.checkBox5.CheckedChanged += new System.EventHandler(this.checkBox5_CheckedChanged);
+      // 
       // label2
       // 
       this.label2.AutoSize = true;
@@ -1561,6 +1578,27 @@ private void InitializeComponent()
       this.toolStripStatusLabel1.Size = new System.Drawing.Size(15, 20);
       this.toolStripStatusLabel1.Text = "..";
       // 
+      // groupBox9
+      // 
+      this.groupBox9.Controls.Add(this.checkBox6);
+      this.groupBox9.Location = new System.Drawing.Point(10, 228);
+      this.groupBox9.Name = "groupBox9";
+      this.groupBox9.Size = new System.Drawing.Size(200, 100);
+      this.groupBox9.TabIndex = 32;
+      this.groupBox9.TabStop = false;
+      this.groupBox9.Text = "Port features";
+      // 
+      // checkBox6
+      // 
+      this.checkBox6.AutoSize = true;
+      this.checkBox6.Location = new System.Drawing.Point(6, 21);
+      this.checkBox6.Name = "checkBox6";
+      this.checkBox6.Size = new System.Drawing.Size(169, 17);
+      this.checkBox6.TabIndex = 33;
+      this.checkBox6.Text = "clip by hull during simplification";
+      this.checkBox6.UseVisualStyleBackColor = true;
+      this.checkBox6.CheckedChanged += new System.EventHandler(this.checkBox6_CheckedChanged);
+      // 
       // Form1
       // 
       this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -1622,135 +1660,140 @@ private void InitializeComponent()
       this.tabPage5.PerformLayout();
       this.statusStrip1.ResumeLayout(false);
       this.statusStrip1.PerformLayout();
+      this.groupBox9.ResumeLayout(false);
+      this.groupBox9.PerformLayout();
       this.ResumeLayout(false);
       this.PerformLayout();
 
-        }
-
-        #endregion
-        private System.Windows.Forms.PictureBox pictureBox1;
-        private System.Windows.Forms.Timer timer1;
-        private System.Windows.Forms.TabControl tabControl1;
-        private System.Windows.Forms.TabPage tabPage1;
-        private System.Windows.Forms.TabPage tabPage2;
-        private System.Windows.Forms.ListView listView1;
-        private System.Windows.Forms.ColumnHeader columnHeader1;
-        private System.Windows.Forms.ColumnHeader columnHeader2;
-        private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
-        private System.Windows.Forms.ToolStripMenuItem clearAllToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem;
-        private System.Windows.Forms.StatusStrip statusStrip1;
-        private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabel1;
-        private System.Windows.Forms.Label label3;
-        private System.Windows.Forms.TextBox textBox1;
-        private System.Windows.Forms.Label label4;
-        private System.Windows.Forms.TextBox textBox2;
-        private System.Windows.Forms.ListView listView2;
-        private System.Windows.Forms.ColumnHeader columnHeader3;
-        private System.Windows.Forms.ColumnHeader columnHeader4;
-        private System.Windows.Forms.Label label5;
-        private System.Windows.Forms.TextBox textBox3;
-        private System.Windows.Forms.ToolStripMenuItem moveToSheetsToolStripMenuItem;
-        private System.Windows.Forms.ContextMenuStrip contextMenuStrip2;
-        private System.Windows.Forms.ToolStripMenuItem clearAllToolStripMenuItem1;
-        private System.Windows.Forms.ToolStripMenuItem moveToPolygonsToolStripMenuItem;
-        private System.Windows.Forms.ListView listView3;
-        private System.Windows.Forms.ColumnHeader columnHeader5;
-        private System.Windows.Forms.ContextMenuStrip contextMenuStrip3;
-        private System.Windows.Forms.ToolStripMenuItem importSelectedToolStripMenuItem;
-        private System.Windows.Forms.ColumnHeader columnHeader7;
-        private System.Windows.Forms.ColumnHeader columnHeader6;
-        private System.Windows.Forms.ToolStripMenuItem cloneQntToolStripMenuItem;
-        private System.Windows.Forms.Button button10;
-        private System.Windows.Forms.CheckBox checkBox2;
-        private System.Windows.Forms.CheckBox checkBox3;
-        private System.Windows.Forms.CheckBox checkBox4;
-        private System.Windows.Forms.ComboBox comboBox1;
-        private System.Windows.Forms.Label label7;
-        private System.Windows.Forms.NumericUpDown numericUpDown1;
-        private System.Windows.Forms.ListView listView4;
-        private System.Windows.Forms.ColumnHeader columnHeader8;
-        private System.Windows.Forms.Label label6;
-        private System.Windows.Forms.NumericUpDown numericUpDown2;
-        private System.Windows.Forms.TabPage tabPage4;
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
-        private System.Windows.Forms.Panel panel1;
-        private System.Windows.Forms.GroupBox groupBox1;
-        private System.Windows.Forms.Button button1;
-        private System.Windows.Forms.Label label8;
-        private System.Windows.Forms.NumericUpDown numericUpDown3;
-        private System.Windows.Forms.GroupBox groupBox2;
-        private System.Windows.Forms.Button button13;
-        private System.Windows.Forms.Button button15;
-        private System.Windows.Forms.Button button14;
-        private System.Windows.Forms.Button button16;
-        private System.Windows.Forms.Button button17;
-        private System.Windows.Forms.ToolStrip toolStrip1;
-        private System.Windows.Forms.ToolStripButton toolStripButton1;
-        private System.Windows.Forms.ToolStripButton toolStripButton2;
-        private System.Windows.Forms.GroupBox groupBox3;
-        private System.Windows.Forms.Label label10;
-        private System.Windows.Forms.Label label9;
-        private System.Windows.Forms.TextBox textBox5;
-        private System.Windows.Forms.TextBox textBox4;
-        private System.Windows.Forms.GroupBox groupBox4;
-        private System.Windows.Forms.Button button5;
-        private System.Windows.Forms.Button button6;
-        private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem1;
-        private System.Windows.Forms.ComboBox comboBox2;
-        private System.Windows.Forms.Label label11;
-        private System.Windows.Forms.Button button2;
-        private System.Windows.Forms.ToolStripButton toolStripButton3;
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel2;
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel3;
-        private System.Windows.Forms.Panel panel2;
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel4;
-        private System.Windows.Forms.GroupBox groupBox5;
-        private System.Windows.Forms.GroupBox groupBox6;
-        private System.Windows.Forms.Button button3;
-        private System.Windows.Forms.GroupBox groupBox7;
-        private System.Windows.Forms.Button button4;
-        private System.Windows.Forms.PictureBox pictureBox2;
-        private System.Windows.Forms.Button button7;
-        private System.Windows.Forms.CheckBox checkBox1;
-        private System.Windows.Forms.GroupBox groupBox8;
-        private System.Windows.Forms.RadioButton radioButton3;
-        private System.Windows.Forms.RadioButton radioButton2;
-        private System.Windows.Forms.RadioButton radioButton1;
-        private System.Windows.Forms.Button button8;
-        private System.Windows.Forms.ColumnHeader columnHeader9;
-        private System.Windows.Forms.ColumnHeader columnHeader10;
-        private System.Windows.Forms.TabPage tabPage3;
-        private System.Windows.Forms.ToolStrip toolStrip2;
-        private System.Windows.Forms.ToolStripButton toolStripButton4;
-        private System.Windows.Forms.PictureBox pictureBox3;
-        private System.Windows.Forms.ToolStripButton toolStripButton5;
-        private BrightIdeasSoftware.ObjectListView objectListView1;
-        private BrightIdeasSoftware.OLVColumn olvColumn1;
-        private BrightIdeasSoftware.OLVColumn olvColumn2;
-        private System.Windows.Forms.ToolStripButton toolStripButton6;
-        private BrightIdeasSoftware.ObjectListView objectListView2;
-        private BrightIdeasSoftware.OLVColumn olvColumn3;
-        private BrightIdeasSoftware.OLVColumn olvColumn4;
-        private BrightIdeasSoftware.OLVColumn olvColumn5;
-        private System.Windows.Forms.ContextMenuStrip contextMenuStrip4;
-        private System.Windows.Forms.ToolStripMenuItem clearToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem2;
-        private System.Windows.Forms.TabPage tabPage5;
-        private System.Windows.Forms.Label label1;
-        private System.Windows.Forms.LinkLabel linkLabel1;
-        private System.Windows.Forms.Panel panel3;
-        private System.Windows.Forms.ToolStrip toolStrip3;
-        private System.Windows.Forms.ToolStripButton toolStripButton8;
-        private System.Windows.Forms.ToolStripButton toolStripButton9;
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel7;
-        private System.Windows.Forms.Panel panel4;
-        private System.Windows.Forms.Label label2;
-        private System.Windows.Forms.TextBox textBox6;
-        private System.Windows.Forms.ToolStripMenuItem quantityToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem setToToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem multiplyToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem divideToolStripMenuItem;
     }
+
+    #endregion
+    private System.Windows.Forms.PictureBox pictureBox1;
+    private System.Windows.Forms.Timer timer1;
+    private System.Windows.Forms.TabControl tabControl1;
+    private System.Windows.Forms.TabPage tabPage1;
+    private System.Windows.Forms.TabPage tabPage2;
+    private System.Windows.Forms.ListView listView1;
+    private System.Windows.Forms.ColumnHeader columnHeader1;
+    private System.Windows.Forms.ColumnHeader columnHeader2;
+    private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
+    private System.Windows.Forms.ToolStripMenuItem clearAllToolStripMenuItem;
+    private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem;
+    private System.Windows.Forms.StatusStrip statusStrip1;
+    private System.Windows.Forms.ToolStripStatusLabel toolStripStatusLabel1;
+    private System.Windows.Forms.Label label3;
+    private System.Windows.Forms.TextBox textBox1;
+    private System.Windows.Forms.Label label4;
+    private System.Windows.Forms.TextBox textBox2;
+    private System.Windows.Forms.ListView listView2;
+    private System.Windows.Forms.ColumnHeader columnHeader3;
+    private System.Windows.Forms.ColumnHeader columnHeader4;
+    private System.Windows.Forms.Label label5;
+    private System.Windows.Forms.TextBox textBox3;
+    private System.Windows.Forms.ToolStripMenuItem moveToSheetsToolStripMenuItem;
+    private System.Windows.Forms.ContextMenuStrip contextMenuStrip2;
+    private System.Windows.Forms.ToolStripMenuItem clearAllToolStripMenuItem1;
+    private System.Windows.Forms.ToolStripMenuItem moveToPolygonsToolStripMenuItem;
+    private System.Windows.Forms.ListView listView3;
+    private System.Windows.Forms.ColumnHeader columnHeader5;
+    private System.Windows.Forms.ContextMenuStrip contextMenuStrip3;
+    private System.Windows.Forms.ToolStripMenuItem importSelectedToolStripMenuItem;
+    private System.Windows.Forms.ColumnHeader columnHeader7;
+    private System.Windows.Forms.ColumnHeader columnHeader6;
+    private System.Windows.Forms.ToolStripMenuItem cloneQntToolStripMenuItem;
+    private System.Windows.Forms.Button button10;
+    private System.Windows.Forms.CheckBox checkBox2;
+    private System.Windows.Forms.CheckBox checkBox3;
+    private System.Windows.Forms.CheckBox checkBox4;
+    private System.Windows.Forms.ComboBox comboBox1;
+    private System.Windows.Forms.Label label7;
+    private System.Windows.Forms.NumericUpDown numericUpDown1;
+    private System.Windows.Forms.ListView listView4;
+    private System.Windows.Forms.ColumnHeader columnHeader8;
+    private System.Windows.Forms.Label label6;
+    private System.Windows.Forms.NumericUpDown numericUpDown2;
+    private System.Windows.Forms.TabPage tabPage4;
+    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
+    private System.Windows.Forms.Panel panel1;
+    private System.Windows.Forms.GroupBox groupBox1;
+    private System.Windows.Forms.Button button1;
+    private System.Windows.Forms.Label label8;
+    private System.Windows.Forms.NumericUpDown numericUpDown3;
+    private System.Windows.Forms.GroupBox groupBox2;
+    private System.Windows.Forms.Button button13;
+    private System.Windows.Forms.Button button15;
+    private System.Windows.Forms.Button button14;
+    private System.Windows.Forms.Button button16;
+    private System.Windows.Forms.Button button17;
+    private System.Windows.Forms.ToolStrip toolStrip1;
+    private System.Windows.Forms.ToolStripButton toolStripButton1;
+    private System.Windows.Forms.ToolStripButton toolStripButton2;
+    private System.Windows.Forms.GroupBox groupBox3;
+    private System.Windows.Forms.Label label10;
+    private System.Windows.Forms.Label label9;
+    private System.Windows.Forms.TextBox textBox5;
+    private System.Windows.Forms.TextBox textBox4;
+    private System.Windows.Forms.GroupBox groupBox4;
+    private System.Windows.Forms.Button button5;
+    private System.Windows.Forms.Button button6;
+    private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem1;
+    private System.Windows.Forms.ComboBox comboBox2;
+    private System.Windows.Forms.Label label11;
+    private System.Windows.Forms.Button button2;
+    private System.Windows.Forms.ToolStripButton toolStripButton3;
+    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel2;
+    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel3;
+    private System.Windows.Forms.Panel panel2;
+    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel4;
+    private System.Windows.Forms.GroupBox groupBox5;
+    private System.Windows.Forms.GroupBox groupBox6;
+    private System.Windows.Forms.Button button3;
+    private System.Windows.Forms.GroupBox groupBox7;
+    private System.Windows.Forms.Button button4;
+    private System.Windows.Forms.PictureBox pictureBox2;
+    private System.Windows.Forms.Button button7;
+    private System.Windows.Forms.CheckBox checkBox1;
+    private System.Windows.Forms.GroupBox groupBox8;
+    private System.Windows.Forms.RadioButton radioButton3;
+    private System.Windows.Forms.RadioButton radioButton2;
+    private System.Windows.Forms.RadioButton radioButton1;
+    private System.Windows.Forms.Button button8;
+    private System.Windows.Forms.ColumnHeader columnHeader9;
+    private System.Windows.Forms.ColumnHeader columnHeader10;
+    private System.Windows.Forms.TabPage tabPage3;
+    private System.Windows.Forms.ToolStrip toolStrip2;
+    private System.Windows.Forms.ToolStripButton toolStripButton4;
+    private System.Windows.Forms.PictureBox pictureBox3;
+    private System.Windows.Forms.ToolStripButton toolStripButton5;
+    private BrightIdeasSoftware.ObjectListView objectListView1;
+    private BrightIdeasSoftware.OLVColumn olvColumn1;
+    private BrightIdeasSoftware.OLVColumn olvColumn2;
+    private System.Windows.Forms.ToolStripButton toolStripButton6;
+    private BrightIdeasSoftware.ObjectListView objectListView2;
+    private BrightIdeasSoftware.OLVColumn olvColumn3;
+    private BrightIdeasSoftware.OLVColumn olvColumn4;
+    private BrightIdeasSoftware.OLVColumn olvColumn5;
+    private System.Windows.Forms.ContextMenuStrip contextMenuStrip4;
+    private System.Windows.Forms.ToolStripMenuItem clearToolStripMenuItem;
+    private System.Windows.Forms.ToolStripMenuItem deleteToolStripMenuItem2;
+    private System.Windows.Forms.TabPage tabPage5;
+    private System.Windows.Forms.Label label1;
+    private System.Windows.Forms.LinkLabel linkLabel1;
+    private System.Windows.Forms.Panel panel3;
+    private System.Windows.Forms.ToolStrip toolStrip3;
+    private System.Windows.Forms.ToolStripButton toolStripButton8;
+    private System.Windows.Forms.ToolStripButton toolStripButton9;
+    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel7;
+    private System.Windows.Forms.Panel panel4;
+    private System.Windows.Forms.Label label2;
+    private System.Windows.Forms.TextBox textBox6;
+    private System.Windows.Forms.ToolStripMenuItem quantityToolStripMenuItem;
+    private System.Windows.Forms.ToolStripMenuItem setToToolStripMenuItem;
+    private System.Windows.Forms.ToolStripMenuItem multiplyToolStripMenuItem;
+    private System.Windows.Forms.ToolStripMenuItem divideToolStripMenuItem;
+    private System.Windows.Forms.CheckBox checkBox5;
+    private System.Windows.Forms.GroupBox groupBox9;
+    private System.Windows.Forms.CheckBox checkBox6;
+  }
 }
 
diff --git a/DeepNestPort/Form1.cs b/DeepNestPort/Form1.cs
index 8ab88b0..c333e7b 100644
--- a/DeepNestPort/Form1.cs
+++ b/DeepNestPort/Form1.cs
@@ -16,6 +16,8 @@
 
   public partial class Form1 : Form
   {
+    bool drawSimplification = true;
+
     public Form1()
     {
       InitializeComponent();
@@ -52,6 +54,8 @@ public Form1()
       this.comboBox1.SelectedItem = SvgNest.Config.PlacementType.ToString();
       this.textBox1.Text = SvgNest.Config.Spacing.ToString();
 
+      this.checkBox6.Checked = SvgNest.Config.clipByHull;
+
       UpdateFilesList(@"dxfs");
       Load += Form1_Load;
     }
@@ -127,92 +131,57 @@ public SvgNest nest
     public void RedrawPreview(DrawingContext ctx2, object previewObject)
     {
       ctx2.Update();
+      ctx2.Clear(Color.White);
 
-      ctx2.gr.Clear(Color.White);
-
-      //ctx2.gr.DrawLine(Pens.Blue, ctx2.Transform(new PointF(0, 0)), ctx2.Transform(100, 0));
-      //ctx2.gr.DrawLine(Pens.Red, ctx2.Transform(new PointF(0, 0)), ctx2.Transform(0, 100));
+      // ctx2.gr.DrawLine(Pens.Blue, ctx2.Transform(new PointF(0, 0)), ctx2.Transform(100, 0));
+      // ctx2.gr.DrawLine(Pens.Red, ctx2.Transform(new PointF(0, 0)), ctx2.Transform(0, 100));
+      ctx2.Reset();
 
       if (previewObject != null)
       {
-        ctx2.gr.ResetTransform();
-        GraphicsPath gp = new GraphicsPath();
-        GraphicsPath gp2 = new GraphicsPath();
-
-        if (previewObject is RawDetail raw)
-        {
-          DrawOuters(ctx2, gp, gp2, raw);
-          ApplyInk(ctx2, gp);
-          AddApproximation(ctx2, raw);
-        }
-        else if (previewObject is NFP nfp)
+        RectangleF bnd;
+        if (previewObject is RawDetail || previewObject is NFP)
         {
-          DrawNfp(ctx2, gp, nfp);
-          ApplyInk(ctx2, gp);
-        }
-
-        var bnd = gp2.GetBounds();
+          if (previewObject is RawDetail raw)
+          {
+            ctx2.Draw(raw, Pens.Black, Brushes.LightBlue);
+            if (this.drawSimplification)
+            {
+              AddApproximation(ctx2, raw);
+            }
 
-        ctx2.gr.ResetTransform();
-        var cap = $"{bnd.Width:N2} x {bnd.Height:N2}";
-        var ms = ctx2.gr.MeasureString(cap, SystemFonts.DefaultFont);
-        ctx2.gr.FillRectangle(new SolidBrush(Color.FromArgb(128, Color.LightGreen)), 5, 5, ms.Width, ms.Height);
+            bnd = raw.BoundingBox();
+          }
+          else
+          {
+            var g = ctx2.Draw(previewObject as NFP, Pens.Black, Brushes.LightBlue);
+            bnd = g.GetBounds();
+          }
 
-        ctx2.gr.DrawString(cap, SystemFonts.DefaultFont, Brushes.Black, 5, 5);
+          var cap = $"{bnd.Width:N2} x {bnd.Height:N2}";
+          ctx2.DrawLabel(cap, Brushes.Black, Color.LightGreen, 5, 5);
+        }
       }
 
       ctx2.Setup();
     }
 
-    private static void ApplyInk(DrawingContext ctx2, GraphicsPath gp)
-    {
-      ctx2.gr.FillPath(Brushes.LightBlue, gp);
-      ctx2.gr.DrawPath(Pens.Black, gp);
-    }
-
-    private static void DrawOuters(DrawingContext ctx2, GraphicsPath gp, GraphicsPath gp2, RawDetail raw)
-    {
-      foreach (var item in raw.Outers)
-      {
-        gp.AddPolygon(item.Points.Select(z => ctx2.Transform(z)).ToArray());
-        gp2.AddPolygon(item.Points.ToArray());
-      }
-    }
-
-    private static void DrawNfp(DrawingContext ctx2, GraphicsPath gp, NFP nfp)
-    {
-      gp.AddPolygon(nfp.Points.Select(z => ctx2.Transform(z.x, z.y)).ToArray());
-      if (nfp.Children != null)
-      {
-        foreach (var item in nfp.Children)
-        {
-          gp.AddPolygon(item.Points.Select(z => ctx2.Transform(z.x, z.y)).ToArray());
-        }
-      }
-    }
-
     /// <summary>
     /// Display the bounds that will be used by the nesting algorithym.
     /// </summary>
-    /// <param name="ctx2">Drawing context upon which to draw.</param>
+    /// <param name="ctx">Drawing context upon which to draw.</param>
     /// <param name="raw">The part to approximate.</param>
-    private void AddApproximation(DrawingContext ctx2, RawDetail raw)
+    private void AddApproximation(DrawingContext ctx, RawDetail raw)
     {
       var nestingContext = new NestingContext(new MessageBoxService());
       NFP part;
       nestingContext.TryImportFromRawDetail(raw, 0, out part);
 
-      GraphicsPath gp = new GraphicsPath();
-
       var simplification = SvgNest.simplifyFunction(part, false);
-      DrawNfp(ctx2, gp, simplification);
+      ctx.Draw(simplification, Pens.Red);
 
-      ctx2.gr.DrawPath(Pens.Red, gp);
       var pointsChange = $"{part.Points.Length} => {simplification.Points.Length} points";
-      var ms = ctx2.gr.MeasureString(pointsChange, SystemFonts.DefaultFont);
-      var topLeftY = (5 * 2) + ms.Height;
-      ctx2.gr.FillRectangle(new SolidBrush(Color.FromArgb(128, Color.Orange)), 5, topLeftY, ms.Width, ms.Height);
-      ctx2.gr.DrawString(pointsChange, SystemFonts.DefaultFont, Brushes.Black, 5, topLeftY);
+      ctx.DrawLabel(pointsChange, Brushes.Black, Color.Orange, 5, (int)(10 + ctx.GetLabelHeight()));
     }
 
     public void Redraw()
@@ -231,9 +200,9 @@ public void Redraw()
       #endregion
 
       ctx.gr.SmoothingMode = SmoothingMode.AntiAlias;
-      ctx.gr.Clear(Color.White);
+      ctx.Clear(Color.White);
 
-      ctx.gr.ResetTransform();
+      ctx.Reset();
 
       ctx.gr.DrawLine(Pens.Red, ctx.Transform(new PointF(0, 0)), ctx.Transform(new PointF(1000, 0)));
       ctx.gr.DrawLine(Pens.Blue, ctx.Transform(new PointF(0, 0)), ctx.Transform(new PointF(0, 1000)));
@@ -336,7 +305,6 @@ public void Redraw()
               bool was = false;
               foreach (var zitem in fr.placements.First())
               {
-
                 var sheetid = zitem.sheetId;
                 if (sheetid != item.Id) continue;
                 var sheet = sheets.FirstOrDefault(z => z.Id == sheetid);
@@ -346,7 +314,6 @@ public void Redraw()
                   was = true;
                   foreach (var ssitem in zitem.sheetplacements)
                   {
-
                     var poly = polygons.FirstOrDefault(z => z.Id == ssitem.id);
                     if (poly != null)
                     {
@@ -372,10 +339,8 @@ public void Redraw()
     public void RenderSheet()
     {
       ctx.gr.SmoothingMode = SmoothingMode.AntiAlias;
-      ctx.gr.Clear(Color.White);
-
-      ctx.gr.ResetTransform();
-
+      ctx.Clear(Color.White);
+      ctx.Reset();
 
       foreach (var item in polygons.Union(sheets))
       {
@@ -1639,5 +1604,15 @@ private void divideToolStripMenuItem_Click(object sender, EventArgs e)
       }
       objectListView1.RefreshObjects(objectListView1.SelectedObjects);
     }
+
+    private void checkBox5_CheckedChanged(object sender, EventArgs e)
+    {
+      drawSimplification = checkBox5.Checked;
+    }
+
+    private void checkBox6_CheckedChanged(object sender, EventArgs e)
+    {
+      SvgNest.Config.clipByHull = checkBox6.Checked;
+    }
   }
 }
\ No newline at end of file
diff --git a/DeepNestPort/Form1.resx b/DeepNestPort/Form1.resx
index 49f3f4c..f09bb5e 100644
--- a/DeepNestPort/Form1.resx
+++ b/DeepNestPort/Form1.resx
@@ -120,6 +120,9 @@
   <metadata name="toolStrip3.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>1155, 17</value>
   </metadata>
+  <metadata name="toolStrip3.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>1155, 17</value>
+  </metadata>
   <assembly alias="System.Drawing" name="System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
   <data name="toolStripButton8.Image" type="System.Drawing.Bitmap, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
     <value>
@@ -151,6 +154,9 @@
         TgDQASA1MVpwzwAAAABJRU5ErkJggg==
 </value>
   </data>
+  <metadata name="toolStrip2.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>895, 17</value>
+  </metadata>
   <metadata name="contextMenuStrip4.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>1000, 17</value>
   </metadata>