/// <summary>
/// An array of coordinates which control how the background line for planets is drawn.
/// The number of points in this array is independent of the number of points in the point group,
/// but the curve follows the other parameters.
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
public PointF[] ConnectingLineCoordinates(PointGroup p)
{
PointGroup clone = p.Clone();
clone.Count = 200;
clone.GetFixedPointWindowsPixelCoordinates(_fieldPanelCentreX, _fieldPanelCentreY, _scale);
return clone.WindowsPixelCoordinates;
}