/// <summary>
/// 获取多个点的平均位置
/// </summary>
/// <param name="points"></param>
/// <returns></returns>
public static PointF Average(this PointF @this, params PointF[] points)
{
PointF[] newPoints = new PointF[points.Length + 1];
for (int i = 0; i < points.Length; i++)
{
newPoints[i] = points[i];
}
newPoints[points.Length] = @this;
return(new PointF(newPoints.Average(p => p.X), newPoints.Average(p => p.Y)));
}