public virtual void EndStroke()
{
activeStroke = null;
}
private void QueuePaddedDrawArea(Stroke s)
{
QueuePaddedDrawArea((int)s.X,(int)s.Y,(int)s.Width,(int)s.Height);
}
public virtual void BeginStroke(Pen style)
{
activeStroke = new Stroke(style);
Strokes.RemoveRange(Strokes.Count - undo, undo);
undo = 0;
Strokes.Add(activeStroke);
}