📄 trendlineexponentialext.aspx
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<%@ Page Language="C#" 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 - ExponentialFit</TITLE>
<script runat="server">
void Page_Load(Object sender,EventArgs e)
{
// This sample demonstrates the use of TrendLineExponential from within ForecatEngine
// which find the best fitting exponential curve to sets of data
// The Forecast Chart
ForecastChart.Title="Forecast Exponential";
ForecastChart.TempDirectory="temp";
ForecastChart.Debug=true;
ForecastChart.Size = "1000x400";
ForecastChart.LegendBox.Template ="%icon %name";
ForecastChart.XAxis.Scale = Scale.Normal;
SeriesCollection exponential = new SeriesCollection();
// Generate a exponential data sample
Series sampledata1 = new Series ("Sample 1");
for ( int i = 1; i < 12; i++) {
Element el = new Element();
el.YValue = Math.Exp(i)+ 5;
el.XValue = i ;
sampledata1.Elements.Add (el);
}
exponential.Add (sampledata1);
exponential[0].Type = SeriesType.Marker;
// Add the exponetial SeriesCollection to the chart
ForecastChart.SeriesCollection.Add (exponential);
// Here we create a series which will hold the Y values calculated with the ExponentialFit
// considering three additional evaluation points which above the x-coordinates of the
// original given data set.
Series expFit = new Series();
expFit = ForecastEngine.TrendLineExponential(sampledata1,1,3,0);
//The next two lines display on to the chart the exponential function used
// to fit the curve
expFit.Elements[0].SmartLabel.Text = "Function: %Function";
expFit.Elements[0].ShowValue = true;
expFit.DefaultElement.Color = Color.FromArgb(255,99,49);
expFit.Type = SeriesType.Spline;
ForecastChart.SeriesCollection.Add(expFit);
}
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="ForecastChart" runat="server"/>
</dotnet:Chart>
</DIV>
</BODY>
</HTML>
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