} //GetPlotRectangle
/// <summary>
/// Converts a ChartLine object to a ChartPolygon object that has
/// one edge along the bottom Horizontal base line in the plot.
/// </summary>
/// <param name="chartLine"></param>
/// <returns></returns>
public static ChartPrimitive ChartLineToBaseLinedPolygon(ChartPrimitive chartLine)
{
ChartPrimitive chartPolygon = chartLine.Clone();
Point firstPoint = chartPolygon.Points[0];
firstPoint.Y = 0;
Point lastPoint = chartPolygon.Points[chartPolygon.Points.Count - 1];
lastPoint.Y = 0;
chartPolygon.InsertPoint(firstPoint, null, 0);
chartPolygon.AddPoint(lastPoint);
chartPolygon.Filled = true;
return(chartPolygon);
}
