drawing.cs

private static void draw_figure<T>(MouseEventArgs e, Draw_Delegate<T> draw_func, T brushOrPen)
{
  if (Start_Point.X > e.X && Start_Point.Y > e.Y)
  {
    draw_func(brushOrPen, e.X, e.Y, Start_Point.X - e.X, Start_Point.Y - e.Y);
  }
  else
  {
    if (Start_Point.X < e.X && Start_Point.Y < e.Y)
    {
      draw_func(brushOrPen, Start_Point.X, Start_Point.Y, e.X - Start_Point.X, e.Y - Start_Point.Y);
    }
    else if (Start_Point.X > e.X && Start_Point.Y < e.Y)
    {
      draw_func(brushOrPen, e.X, Start_Point.Y, Start_Point.X - e.X, e.Y - Start_Point.Y);
    }
    else if (Start_Point.X < e.X && Start_Point.Y > e.Y)
    {
      draw_func(brushOrPen, Start_Point.X, e.Y, e.X - Start_Point.X, Start_Point.Y - e.Y);
    }    
  }
}