📄 dynamicaxismarkers.aspx
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<%@ Page Language="VB" Debug="true" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<script runat="server">
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 1 To 4
Dim s As New Series()
s.Name = "Series " + CStr(a)
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Element " + CStr(b)
e.YValue = myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
Return SC
End Function 'getRandomData
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo 'Horizontal;
Chart.TempDirectory = "temp"
Chart.Debug = True
' This sample demonstrates how you can create dynamic axis markers based on the data.
' We'll set the default type to line so it can be viewed better.
Chart.DefaultSeries.Type = SeriesType.Line
' 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.
Dim sc As SeriesCollection = getRandomData()
' We now calculate and add the axis markers to the y axis.
' First we'll get single series calculations the highs and lows from the series collection.
Dim highS As Series = sc.Calculate("", Calculation.Maximum)
Dim lowS As Series = sc.Calculate("", Calculation.Minimum)
'Now from each series we can calculate high and low values as single elements.
' Because series.Calculate returns an element we use the yValue of the result
Dim high As Double = highS.Calculate("", Calculation.Maximum).YValue
Dim low As Double = lowS.Calculate("", Calculation.Minimum).YValue
' Add the markers to the y axis.
Chart.YAxis.Markers.Add(New AxisMarker("Low", New Line(Color.Red, 4), low))
Chart.YAxis.Markers.Add(New AxisMarker("High", New Line(Color.Green, 4), high))
' This code will add a range marker
Chart.YAxis.Markers.Add(New AxisMarker("Range", New Background(Color.Orange), low, high))
' Add the random data.
Chart.SeriesCollection.Add(sc)
End Sub 'Page_Load
</script>
<HTML><HEAD><TITLE>Dynamic Axis Marker</TITLE></HEAD>
<BODY>
<DIV align=center>
<dotnet:Chart id="Chart" runat="server"/>
</DIV>
</BODY>
</BODY>
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