using System;
using System.Drawing;
using System.Windows.Forms;
class Scribble: Form
{
bool bTracking;
Point ptLast;
public static void Main()
{
Application.Run(new Scribble());
}
public Scribble()
{
Text = "Scribble";
}
protected override void OnMouseDown(MouseEventArgs mea)
{
if (mea.Button != MouseButtons.Left)
return;
ptLast = new Point(mea.X, mea.Y);
bTracking = true;
}
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();
ptLast = ptNew;
}
protected override void OnMouseUp(MouseEventArgs mea)
{
bTracking = false;
}
}
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