Scribble with Bitmap : Image « 2D Graphics « C# / C Sharp

Scribble with Bitmap


using System;
using System.Drawing;
using System.Windows.Forms;
class ScribbleWithBitmap: Form
     bool     bTracking;
     Point    ptLast;
     Bitmap   bitmap;
     Graphics grfxBm;
     public static void Main()
          Application.Run(new ScribbleWithBitmap());
     public ScribbleWithBitmap()
          Size size = SystemInformation.PrimaryMonitorMaximizedWindowSize;
          bitmap = new Bitmap(size.Width, size.Height);
          grfxBm = Graphics.FromImage(bitmap);
     protected override void OnMouseDown(MouseEventArgs mea)
          if (mea.Button != MouseButtons.Left)
          ptLast = new Point(mea.X, mea.Y);
          bTracking = true;
     protected override void OnMouseMove(MouseEventArgs mea)
          if (!bTracking)
          Point ptNew = new Point(mea.X, mea.Y);
          Pen pen = new Pen(ForeColor);
          Graphics grfx = CreateGraphics();
          grfx.DrawLine(pen, ptLast, ptNew);
          grfxBm.DrawLine(pen, ptLast, ptNew);
          ptLast = ptNew;
     protected override void OnMouseUp(MouseEventArgs mea)
          bTracking = false;
     protected override void OnPaint(PaintEventArgs pea)
          Graphics grfx = pea.Graphics;
          grfx.DrawImage(bitmap, 0, 0, bitmap.Width, bitmap.Height);


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