📄 trendline.aspx
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<%@ Page Language="VB" debug="true" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<HTML>
<HEAD>
<TITLE>Trend Line</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo 'Horizontal;
Chart.Width = Unit.Parse(750)
Chart.Height = Unit.Parse(300)
Chart.TempDirectory = "temp"
Chart.Debug = True
' This sample will demonstrate how to derive trend lines from your data.
' First we get our data, if you would like to get the data from a database you need to use
' the data engine. See sample: features/dataEngine.aspx. Or the dataEngine tutorial in the help file.
Dim mySC As SeriesCollection = getRandomData()
' Setup
Chart.DefaultSeries.Line.Width = 2
Chart.DefaultSeries.DefaultElement.Transparency = 45
Chart.LegendBox.Position = LegendBoxPosition.BottomMiddle
Chart.DefaultSeries.DefaultElement.Marker.Type = ElementMarkerType.None
' Get a trend line from series 1. Because only the SeriesCollection Calculate method returns a series a
' SeriesCollection is instantiated and the method is used.
Dim trend1 As Series = New SeriesCollection(mySC(0)).Calculate("Series 1 Trend", Calculation.TrendLineLinear)
' Set the type to line
trend1.Type = SeriesType.Line
'We'll give this line a green color so it looks like the related green columns of series 2.
trend1.DefaultElement.Color = Color.FromArgb(25, 225, 25)
' Trend line from Series 1 & 2
' This time we want to predict what will happen 10 steps from now so we pass an extra parameter to the
' calculate method.
Dim trend2 As Series = mySC.Calculate("Series 1 & 2 Trend + (10 elements)", Calculation.TrendLineLinear, 10)
' Set the series type to line
trend2.Type = SeriesType.Line
' Give this trend line a blue color.
trend2.DefaultElement.Color = Color.FromArgb(0, 156, 255)
' Add the trend lines to the collection.
mySC.Add(trend1)
mySC.Add(trend2)
' Add the collection.
Chart.SeriesCollection.Add(mySC)
End Sub 'Page_Load
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 1 To 2
Dim s As New Series()
s.Name = "Series " + a.ToString()
Dim b As Integer
For b = 1 To 35
Dim e As New Element()
e.Name = "Element " + b.ToString()
If a = 0 Then
e.YValue = myR.Next(30)
Else
e.YValue = myR.Next(50)
End If
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
' Set Different Colors for our Series
SC(0).DefaultElement.Color = Color.FromArgb(49, 255, 49)
SC(1).DefaultElement.Color = Color.FromArgb(255, 255, 0)
Return SC
End Function 'getRandomData </script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="Chart" runat="server" Width="568px" Height="344px">
</dotnet:Chart>
</DIV>
</BODY>
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