📄 ratecharts.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">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo
Chart.Size = "600x350"
Chart.TempDirectory = "temp"
' Rate charts can be used to show many interesting stats. For this sample we will make a chart that will show
' click through rates for banner campaigns.
' Lets get our data first. The methods below will generate some random data for us to use.
Dim views As Series = getRandomViewsData()
Dim clicks As Series = getRandomClicksData()
' Now to get a rate is as easy as this:
Dim rate As Series = Series.Divide(clicks, views)
' We need a new name for the series
rate.Name = "CTR"
' If we want to show the clicks, views, and rates then we need to create a new y axis because the CTR is so
' small that it will not be readable.
Dim ctrAxis As New Axis("Click Through Ratio (CTR)")
' A new number precision has be to supplied so the numbers can be seen. Otherwise we will see only 0s on the axis.
ctrAxis.NumberPrecision = 4
' Lets move it on the right side also
ctrAxis.Orientation = dotnetCHARTING.Orientation.Right
' Now to assign the ctr axis to the ctr series:
rate.YAxis = ctrAxis
' In the legend the values are sums by default and that does not make sense for CTR so lets
' make the value in the legend an average for the ctr series.
rate.LegendEntry.Value = "Average: %YAverage"
' Show values on bars
Chart.DefaultSeries.DefaultElement.ShowValue = True
' Add the data.
Chart.SeriesCollection.Add(views)
Chart.SeriesCollection.Add(clicks)
Chart.SeriesCollection.Add(rate)
End Sub 'Page_Load
Function getRandomViewsData() As Series ' This method will generate a series representing views for our banners
Dim myR As New Random()
Dim s As New Series()
s.Name = "Views"
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Banner " + b.ToString()
e.YValue = 50 + myR.Next(500)
s.Elements.Add(e)
Next b
Return s
End Function 'getRandomViewsData
Function getRandomClicksData() As Series ' This method will generate a series representing clicks for our banners
Dim myR As New Random()
Dim s As New Series()
s.Name = "Clicks"
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Banner " + b.ToString()
e.YValue = myR.Next(50)
s.Elements.Add(e)
Next b
Return s
End Function 'getRandomClicksData
</script>
<HTML><HEAD><TITLE>Rate chart</TITLE></HEAD>
<BODY>
<DIV align=center>
<dotnet:Chart id="Chart" runat="server"/>
</DIV>
</BODY>
</BODY>
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