📄 elementannotation.aspx
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<%@ Import Namespace="System.Drawing" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Page Language="VB" debug="true" Description="dotnetCHARTING Component" %>
<HTML>
<HEAD>
<TITLE>Element Annotation</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo 'Horizontal;
Chart.Width = Unit.Parse(600)
Chart.Height = Unit.Parse(350)
Chart.TempDirectory = "temp"
' This sample demonstrates how to attach an annotation to an element on the chart.
' This can be any element in any chart type.
' 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()
' Instantiate the annotation with the initial text. Because this annotation will be associated with an element
' we can use all the element tokens in the text, toolTip and even url of this annotation.
Dim a As New Annotation("Element: %Name " + ControlChars.Lf + " Series: %SeriesName " + ControlChars.Lf + " Value: %YValue")
' Set the background color.
a.Background.Color = Color.FromArgb(200, 180, 180, 220)
' Bevel the background.
a.Background.Bevel = True
' Orient the annotation be on the top left side of our element.
a.Orientation = dotnetCHARTING.Orientation.TopLeft
' Make all the corners round.
a.DefaultCorner = BoxCorner.Round
' Dont dynamically size the annotation.
a.DynamicSize = False
' Assign the annotation to an element in the sc collection.
sc(0).Elements(2).Annotation = a
' Add the random data.
Chart.SeriesCollection.Add(sc)
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 4
Dim s As New Series()
s.Name = "Series " + a.ToString()
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Element " + b.ToString()
'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)
SC(2).DefaultElement.Color = Color.FromArgb(255, 99, 49)
SC(3).DefaultElement.Color = Color.FromArgb(0, 156, 255)
Return SC
End Function 'getRandomData
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="Chart" runat="server" Width="568px" Height="344px" Depth="13px" Use3D="True">
</dotnet:Chart>
</DIV>
</BODY>
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