Csharp/C Sharp/2D Graphics/Path

Add a rectangle to a Path

 
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    GraphicsPath gp = new GraphicsPath();
    
    gp.AddRectangle(new Rectangle(10, 50, 80, 20));
    gp.AddEllipse(50, 10, 20, 80);
    g.DrawPath(Pens.Black, gp);
    gp.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}

Add Bezier to a Path

 

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class Flower: Form
{
     public static void Main()
     {
          Application.Run(new Flower());
     }
     public Flower()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }      
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {   
  
          float fScale = Math.Min(cx, cy) / 200f;
          grfx.TranslateTransform(cx / 2, cy / 2);
          grfx.ScaleTransform(fScale, fScale);
   
          GraphicsPath path = new GraphicsPath();
   
          path.AddBezier(new Point(  0,    0), new Point(125,  125),
                         new Point(75,  15), new Point(600,    0));
   
          for (int i = 0; i < 8; i++)
          {
               grfx.FillPath(Brushes.Red, path);
               grfx.DrawPath(Pens.Black, path);
               grfx.RotateTransform(360 / 8);
          }
   
          Rectangle rect = new Rectangle(-150, -150, 300, 300);
          grfx.FillEllipse(Brushes.Yellow, rect);
          grfx.DrawEllipse(Pens.Black, rect);
     }
}

Add closed figures to GraphicsPath

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      // Create a figure
      gp.AddRectangle(new Rectangle(10, 50, 80, 20));
      // Create another figure
      gp.AddEllipse(50, 10, 20, 80);
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Add Ellipse to path

 

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class Clover: Form
{
     public static void Main()
     {
          Application.Run(new Clover());
     }
     public Clover()
     {
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }       
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          GraphicsPath path = new GraphicsPath();
   
          path.AddEllipse(0,      cy / 3, cx / 2, cy / 3);  // Left
   
          grfx.SetClip(path);
          grfx.TranslateTransform(cx / 2, cy / 2);
   
          Pen   pen     = new Pen(clr);
          float fRadius = (float) Math.Sqrt(Math.Pow(cx / 2, 2) + 
                                            Math.Pow(cy / 2, 2));
     
          for (float fAngle = 0; fAngle <  (float) Math.PI * 2; 
                                 fAngle += (float) Math.PI / 180)
          {
               grfx.DrawLine(pen, 0, 0, fRadius * (float) Math.Cos(fAngle),
                                       -fRadius * (float) Math.Sin(fAngle));
          }
     }
}

Add Line and Arc to Path

 
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class LineArcPath: Form
{
     public static void Main()
     {
          Application.Run(new LineArcPath());
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }      
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          GraphicsPath path = new GraphicsPath();
          Pen          pen  = new Pen(clr, 25);
   
          path.AddLine( 25, 100, 125, 100);
          path.AddArc (125,  50, 100, 100, -180, 180);
          path.AddLine(225, 100, 325, 100);
   
          grfx.DrawPath(pen, path);
     }
}

Add lines to Path

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "Pen Cap App";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      GraphicsPath gp = new GraphicsPath();
      gp.AddLine(10, 10, 110, 15);
      gp.AddLine(110, 15, 100, 96);
      gp.AddLine(100, 96, 15, 110);
      gp.CloseFigure();
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Close all figures

 
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    GraphicsPath gp = new GraphicsPath();
    gp.AddLine(10, 10, 10, 50);
    gp.AddBezier(10, 50, 10, 55, 25, 70, 30, 70);
    gp.AddLine(30, 70, 60, 70);
    gp.StartFigure();
    gp.AddLine(60, 110, 40, 160);
    gp.CloseAllFigures();
    g.DrawPath(Pens.Black, gp);
    gp.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}

Create Path from String

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      gp.AddString("www.nfex.ru", new FontFamily("Times New Roman"),
            (int)(FontStyle.Bold | FontStyle.Italic),
            144, new Point(5, 5), StringFormat.GenericTypographic);
      g.SetClip(gp);
      g.DrawImage(new Bitmap("winter.jpg"), this.ClientRectangle);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Draw path

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;
public class Form1 : System.Windows.Forms.Form{
  private System.ruponentModel.Container components = null;
  public Form1()
  {
    InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
    protected override void OnPaint (PaintEventArgs e) {
         GraphicsPath path;
         path = new GraphicsPath(new Point[]{ new Point(10, 10),
                                               new Point(50, 10),
                                               new Point(20, 150),
                                               new Point(10, 50),
                                               new Point(200, 160)}, 
            new byte[] {(byte)PathPointType.Start,
                          (byte)PathPointType.Line,
                          (byte)PathPointType.Line,
                          (byte)PathPointType.Line,
                          (byte)PathPointType.Line });
         e.Graphics.DrawPath(Pens.Black, path);
    }
  private void InitializeComponent() {
      this.ruponents = new System.ruponentModel.Container();
    this.Size = new System.Drawing.Size(300,300);
    this.Text = "Form1";
  }
  static void Main() {
    Application.Run(new Form1());
  }
}

Fill path and draw path

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      // Create an open figure
      gp.AddLine(10, 10, 10, 50);
      gp.AddLine(10, 50, 50, 50);
      // Start a new figure
      gp.StartFigure();
      gp.AddLine(60, 10, 60, 50);
      gp.AddLine(60, 50, 100, 50);
      gp.AddLine(100, 50, 100, 10);
      gp.CloseFigure();
      gp.AddEllipse(new Rectangle(110, 10, 40, 40));
      g.FillPath(Brushes.Orange, gp);
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Fillpath Demo

       
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class TestGDI2 : System.Windows.Forms.Form{
    
    //in order to paint something OnPaint method needs to be overridden
    
    protected override void OnPaint(System.Windows.Forms.PaintEventArgs pe) {
        //OnPaint method is a member of Form class 
        //The following call sends pe to an event listener Graphics
        base.OnPaint(pe);
        
        Graphics g = pe.Graphics;
        g.FillRectangle(new SolidBrush(Color.White), ClientRectangle);
        GraphicsPath path = new GraphicsPath(new Point[] {
        new Point(40, 140), new Point(275, 200),
        new Point(105, 225), new Point(190, 300),
        new Point(50, 350), new Point(20, 180), },
        
        new byte[] {
            (byte)PathPointType.Start,
            (byte)PathPointType.Bezier,
            (byte)PathPointType.Bezier,
            (byte)PathPointType.Bezier,
            (byte)PathPointType.Line,
            (byte)PathPointType.Line,
        });
        PathGradientBrush pgb = new PathGradientBrush(path);
        pgb.SurroundColors = new Color[] { Color.Green,Color.Yellow,Color.Red, 
                                            Color.Blue,Color.Orange, Color.White, 
                                          };
        g.FillPath(pgb, path);
    }
    public static void Main() {
        System.Windows.Forms.Application.Run(new TestGDI2());//display form
    }
}

GraphicsPath closes a figure and starts a new figure

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      // Create a figure
      gp.AddLine(10, 10, 10, 50);
      gp.AddBezier(10, 50, 10, 55, 25, 70, 30, 70);
      gp.AddLine(30, 70, 60, 70);
      gp.CloseFigure();
      gp.StartFigure();
      gp.AddLine(60, 110, 40, 160);
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Graphics Path Example

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace GDI_Basics
{
    /// <summary>
    /// Summary description for GraphicsPathExample.
    /// </summary>
    public class GraphicsPathExample : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public GraphicsPathExample()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #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()
        {
            // 
            // GraphicsPathExample
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Name = "GraphicsPathExample";
            this.Text = "GraphicsPathExample";
            this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.GraphicsPathExample_MouseDown);
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.GraphicsPathExample_Paint);
        }
        #endregion

        [STAThread]
        static void Main() 
        {
            Application.Run(new GraphicsPathExample());
        }
        GraphicsPath path;
        private void GraphicsPathExample_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            path = new GraphicsPath();
            path.StartFigure();
            path.AddArc(10, 10, 100, 100, 20, 50);
            path.AddLine(20, 50, 70, 230);
            path.CloseFigure();
            path.AddEllipse(120, 50, 80, 80);
            e.Graphics.FillPath(Brushes.White, path);
            e.Graphics.DrawPath(Pens.Black, path);
        }
        private void GraphicsPathExample_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (path.IsVisible(e.X, e.Y))
            {
                MessageBox.Show("You clicked inside the figure.");
            }
        }
    }
}

GraphicsPath starts a new figure

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      // Create a figure
      gp.AddLine(10, 10, 10, 50);
      gp.AddBezier(10, 50, 130, 55, 25, 70, 30, 70);
      gp.AddLine(30, 70, 60, 70);
      gp.AddBezier(60, 70, 555, 70, 90, 55, 90, 50);
      gp.AddLine(90, 50, 90, 30);
      // Create another figure
      gp.StartFigure();
      gp.AddLine(60, 110, 40, 160);
      gp.AddLine(40, 160, 60, 180);
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

GraphicsPath starts two figures and close them

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;
  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
    static void Main() 
    {
      Application.Run(new Form1());
    }
    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {      
      Graphics g = e.Graphics;
      g.FillRectangle(Brushes.White, this.ClientRectangle);
      GraphicsPath gp = new GraphicsPath();
      // Create a figure
      gp.AddLine(10, 10, 10, 50);
      gp.AddBezier(10, 50, 100, 55, 25, 70, 30, 70);
      gp.AddLine(30, 70, 60, 70);
      // Create another figure
      gp.StartFigure();
      gp.AddLine(60, 110, 40, 160);
      gp.AddLine(40, 160, 60, 180);
      // Close all figures
      gp.CloseAllFigures();
      // Draw the path
      g.DrawPath(Pens.Black, gp);
      gp.Dispose();
    }
    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Is click inside a path

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
public class Form1 : Form
{
        GraphicsPath path;
      public Form1() {
            InitializeComponent();
            
      }
    private void GraphicsPathHit_Paint(object sender, PaintEventArgs e)
    {
      e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
      path = new GraphicsPath();
      path.StartFigure();
      path.AddArc(10, 10, 100, 100, 20, 50);
      path.AddLine(20, 50, 70, 230);
      path.CloseFigure();
      path.AddEllipse(120, 50, 80, 80);
      e.Graphics.FillPath(Brushes.White, path);
      e.Graphics.DrawPath(Pens.Black, path);
    }
    private void GraphicsPathHit_MouseDown(object sender, MouseEventArgs e)
    {
      if (path.IsVisible(e.X, e.Y))
      {
        MessageBox.Show("You clicked inside the figure.");
      }
    }
    private void InitializeComponent()
    {
      this.SuspendLayout();
      // 
      // GraphicsPathHit
      // 
      this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
      this.ClientSize = new System.Drawing.Size(292, 266);
      this.Name = "GraphicsPathHit";
      this.Text = "GraphicsPathHit";
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.GraphicsPathHit_Paint);
      this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.GraphicsPathHit_MouseDown);
      this.ResumeLayout(false);
    }
      [STAThread]
      static void Main()
      {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
      }
}

Scribble with Path

 
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class ScribbleWithPath: Form
{
     GraphicsPath path= new GraphicsPath();
     bool         bTracking;
     Point        ptLast;
   
     public static void Main()
     {
          Application.Run(new ScribbleWithPath());
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          if (mea.Button != MouseButtons.Left)
               return;
   
          ptLast = new Point(mea.X, mea.Y);
          bTracking = true;
   
          path.StartFigure();
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (!bTracking)
               return;
   
          Point ptNew = new Point(mea.X, mea.Y);
          
          Graphics grfx = CreateGraphics();
          grfx.DrawLine(new Pen(ForeColor), ptLast, ptNew);
          grfx.Dispose();
   
          path.AddLine(ptLast, ptNew);
   
          ptLast = ptNew;
     }
     protected override void OnMouseUp(MouseEventArgs mea)
     {
          bTracking = false;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          pea.Graphics.DrawPath(new Pen(ForeColor), path);
     }
}

Start A Figure

 
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    GraphicsPath gp = new GraphicsPath();
    gp.AddLine(10, 10, 10, 50);
    gp.AddBezier(10, 50, 10, 55, 25, 70, 30, 70);
    gp.StartFigure();
    gp.AddLine(60, 110, 40, 160);
    g.DrawPath(Pens.Black, gp);
    gp.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}

Widen a Path

 
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class WidenPath: Form
{
     GraphicsPath path= new GraphicsPath();
   
     public static void Main()
     {
          Application.Run(new WidenPath());
     }
     public WidenPath()
     {
          ResizeRedraw = true; 
   
          path.AddLines(new Point[] { new Point(20, 10),
                                      new Point(50, 50),
                                      new Point(80, 10) });
   
          path.AddPolygon(new Point[] { new Point(20, 30),
                                        new Point(50, 70),
                                        new Point(80, 30) });
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }      
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.ScaleTransform(cx / 300f, cy / 200f);
   
          for (int i = 0; i < 6; i++)
          {
               GraphicsPath pathClone = (GraphicsPath) path.Clone();
               Matrix       matrix    = new Matrix();
               Pen          penThin   = new Pen(clr, 1);
               Pen          penThick  = new Pen(clr, 5);
               Pen          penWiden  = new Pen(clr, 7.5f);
               Brush        brush     = new SolidBrush(clr);               
   
               matrix.Translate((i % 3) * 100, (i / 3) * 100);
   
               if (i < 3)
                    pathClone.Transform(matrix);
               else
                    pathClone.Widen(penWiden, matrix);
   
               switch (i % 3)
               {
               case 0:  grfx.DrawPath(penThin, pathClone);   break;
               case 1:  grfx.DrawPath(penThick, pathClone);  break;
               case 2:  grfx.FillPath(brush, pathClone);     break;
               }
          }
     }
}