📄 trendlinepolynomialext.aspx
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<%@ Page Language="C#" Debug="true" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="dotnetCHARTING"%>
<HTML>
<HEAD>
<TITLE>.netCHARTING Forecasting Sample</TITLE>
<script runat="server">
void Page_Load(Object sender,EventArgs e)
{
// This sample demonstrates the use of TrendLine Forecasting engine in order to
// find the function of best fit for the seventh degree polynomial. The data used for which
// the fuction are fit is a set of data which represents a FX exchange rate over a given
// period of time.
// The Forecast Chart
ForecastChart.Title="Exchange";
ForecastChart.TempDirectory="temp";
ForecastChart.Debug=true;
ForecastChart.Size = "1000x800";
ForecastChart.LegendBox.Template ="%icon %name";
ForecastChart.XAxis.ScaleRange.ValueLow = 3000;
ForecastChart.YAxis.ScaleRange.ValueLow = 220;
//
// The following line allows the source data from which the curve of best fits are
// calibrated to be plotted with curve of best fit and for the x-axis values to be
// syncronized.
//
ForecastChart.XAxis.Scale = Scale.Normal;
// The Forecast data
DataEngine de = new DataEngine ();
de.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;data source=" + Server.MapPath("../../database/chartsample.mdb");
de.DateGrouping = TimeInterval.Days;
de.StartDate = new DateTime(1983,3,10,0,0,0);
de.EndDate = new DateTime(1984,12,10,23,59,59);
de.SqlStatement= @"SELECT ID, Value AS q FROM Exchange WHERE Data >= #STARTDATE# AND Data <= #ENDDATE# ORDER BY Data ";
//Add a series
SeriesCollection scForecast = de.GetSeries ();
ForecastChart.SeriesCollection.Add (scForecast);
scForecast[0].Name = "Exchange";
scForecast[0].Type = SeriesType.Spline;
/*
* Takes off the marker off the line and spline series.
*/
ForecastChart.DefaultSeries.DefaultElement.Marker = new ElementMarker (ElementMarkerType.None);
ForecastChart.ChartAreaLayout.Mode = ChartAreaLayoutMode.Vertical;
// We generate the best fitting curve of a 7th degree polynomial.
// Also we will forecast the valuse the next ten periods
// We set the distance between to values on the X axis to be 1
Series trendLineExt = new Series();
trendLineExt = ForecastEngine.TrendLinePolynomial(scForecast[0], 7,1,10,0);
trendLineExt.Name = "7th Degree Polynomial";
trendLineExt.Type = SeriesType.Spline;
ForecastChart.SeriesCollection.Add(trendLineExt);
}
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="ForecastChart" runat="server"/>
</dotnet:Chart>
</DIV>
</BODY>
</HTML>
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