/// <summary>
/// Called to prepare the Direct2D graphics device for drawing, including clearing the back buffer
/// render target and initializing the Transform property of the D2dGraphics instance.</summary>
protected virtual void OnBeginDrawD2d()
{
D2dGraphics.BeginDraw();
ITransformAdapter xform = this.As <ITransformAdapter>();
D2dGraphics.Transform = xform == null ? Matrix3x2F.Identity : xform.Transform;
D2dGraphics.Clear(BackColor);
D2dGraphics.AntialiasMode = D2dAntialiasMode.Aliased;
}