📄 forecastingpopulation.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 TrendLineExponential from within ForecastEngine
// which find the best fitting exponential curve to sets of data
// The Forecast Chart
ForecastChart.Title="WorldPopulation";
ForecastChart.TempDirectory="temp";
ForecastChart.Debug=true;
ForecastChart.Size = "800x600";
ForecastChart.LegendBox.Template ="%icon %name";
// 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;
ForecastChart.YAxis.ScaleRange.ValueLow = 2000000000;
ForecastChart.XAxis.ScaleRange.ValueLow = 1950;
// The Forecast data
// Here we load data samples from the WorldPopulation table from within chartsample.mdb
DataEngine de = new DataEngine();
de.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;data source=" + Server.MapPath("../../database/chartsample.mdb");
de.DateGrouping = TimeInterval.Years;
de.SqlStatement= @"SELECT Year, Population AS q FROM WorldPopulation WHERE Year <= 2004 ORDER BY Year";
//Add a series
SeriesCollection scForecast = de.GetSeries ();
ForecastChart.SeriesCollection.Add (scForecast);
scForecast[0].Name = "WorldPopulation";
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;
// Here we create a series which will forecast the population growth for the next 10 years,
// taking into account the values registered in the period 1950 -2004.
Series trendLineExponential = new Series();
trendLineExponential = ForecastEngine.TrendLineExponential(scForecast[0],1,10,0);
//The next two lines display on to the chart the exponential function used
// to fit the curve
trendLineExponential.Elements[0].SmartLabel.Text = "Function: %Function";
trendLineExponential.Elements[0].ShowValue = true;
trendLineExponential.DefaultElement.Color = Color.FromArgb(255,99,49);
trendLineExponential.Type = SeriesType.Spline;
ForecastChart.SeriesCollection.Add(trendLineExponential);
}
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="ForecastChart" runat="server"/>
</dotnet:Chart>
</DIV>
</BODY>
</HTML>
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