/// <summary>
/// Adds a drawable object to the plot surface. If the object is an IPlot,
/// the PlotSurface2D axes will also be updated.
/// </summary>
/// <param name="p">The IDrawable object to add to the plot surface.</param>
public void Add(IDrawable p)
{
ps_.Add(p);
}
public void Add(IDrawable p, int zOrder)
{
ps.Add(p, zOrder);
}