public PlotPoints(PlotPoint x, PlotPoint y)
 {
     this.X = x;
     this.Y = y;
     if ((Y.PointType == typeof(int)) || (Y.PointType == typeof(double)) || (Y.PointType == typeof(decimal)))
     {
     }
 }
 public PlotPoints(PlotPoint x, PlotPoint y)
 {
     this.X = x;
     this.Y = y;
 }