/// <summary>
 /// Constructor.
 /// </summary>
 /// <param name="b">The Bitmap where the plot is to be rendered.</param>
 public PlotSurface2D( System.Drawing.Bitmap b )
 {
     b_ = b;
     ps_ = new Florence.PlotSurface2D();
 }
 /// <summary>
 /// Constructor.
 /// </summary>
 /// <param name="b">The Bitmap where the plot is to be rendered.</param>
 public PlotSurface2D(System.Drawing.Bitmap b)
 {
     b_  = b;
     ps_ = new Florence.PlotSurface2D();
 }
 /// <summary>
 /// Constructor.
 /// </summary>
 /// <param name="width">width of the bitmap.</param>
 /// <param name="height">height of the bitmap.</param>
 public PlotSurface2D( int width, int height )
 {
     b_ = new System.Drawing.Bitmap( width, height );
     ps_ = new Florence.PlotSurface2D();
 }
 /// <summary>
 /// Constructor.
 /// </summary>
 /// <param name="width">width of the bitmap.</param>
 /// <param name="height">height of the bitmap.</param>
 public PlotSurface2D(int width, int height)
 {
     b_  = new System.Drawing.Bitmap(width, height);
     ps_ = new Florence.PlotSurface2D();
 }