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);
     }
}