📄 differenceseries.aspx
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<%@ Page Language="VB" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<HTML>
<HEAD>
<TITLE>.netCHARTING Sample</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo
Chart.Size = "600x350"
Chart.TempDirectory = "temp"
Chart.Debug = True
' This sample will demonstrate how a calculated series can be created and placed in a chart area.
' *DYNAMIC DATA NOTE*
' This sample uses random data to populate the chart. To populate
' a chart with database data see the following resources:
' - Classic samples folder
' - Help File > Data Tutorials
' - Sample: features/DataEngine.aspx
Dim mySC As SeriesCollection = getRandomData()
Dim ca1 As New ChartArea()
Dim ca2 As New ChartArea()
ca2.Label.Text = "Difference"
' Create the difference series.
Dim diffSeries As Series = Series.Subtract(mySC(1),mySC(0))
diffSeries.DefaultElement.Color = Color.Red
diffSeries.Name = "Difference"
' Iterate the elements and change their colors based on value.
Dim el As Element
For Each el In diffSeries.Elements
If el.YValue > 0 Then
el.Color = Color.Green
Else
el.Color = Color.Red
End If
Next el ' Add the series and chart areas to the chart.
Chart.SeriesCollection.Add(mySC(0))
ca1.SeriesCollection.Add(mySC(1))
ca2.SeriesCollection.Add(diffSeries)
Chart.ExtraChartAreas.Add(ca1, ca2)
End Sub 'Page_Load
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random(1)
Dim a As Integer
For a = 0 To 1
Dim s As New Series()
s.Name = "Series " +Convert.ToString(a + 1)
Dim b As Integer
For b = 0 To 14
Dim e As New Element()
e.Name = "Element " +Convert.ToString(b + 1)
'e.YValue = -25 + myR.Next(50);
e.YValue = myR.Next(50)
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>
</HTML>
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