📄 postrenderlabeling.aspx
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<%@ Import Namespace="System.Drawing" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Page Language="VB" Debug="true" Description="dotnetCHARTING Component" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Text" %>
<HTML>
<HEAD>
<TITLE>Post Render Drawing Image</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Combo
Chart.Width = Unit.Parse(600)
Chart.Height = Unit.Parse(350)
Chart.TempDirectory = "temp"
Chart.DefaultSeries.Type = SeriesType.Bubble
Chart.Title = "Label elements after the chart is generated."
' This sample shows how element can be labeled after the chart image was created.
' *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 s As SeriesCollection = getRandomData()
' Add the random data.
Chart.SeriesCollection.Add(s)
'Get a bitmap of the chart.
Dim bmp As Bitmap = Chart.GetChartBitmap()
' Create a graphics object from the bitmap
Dim g As Graphics = Graphics.FromImage(bmp)
g.TextRenderingHint = TextRenderingHint.AntiAlias
' After the chart is generated, the element's positions are available.
' Lets iterate the elements we have added and draw a centered label at their positions.
' String format to center the labels.
Dim sf As New StringFormat()
sf.Alignment = StringAlignment.Center
sf.LineAlignment = StringAlignment.Center
Dim i As Integer
For i = 0 To s.Count - 1
Dim ib As Integer
For ib = 0 To (s(i).Elements.Count) - 1
Dim el As Element = s(i).Elements(ib)
g.DrawString(el.Name, New Font("Arial", 8), Brushes.Black, el.Point, sf)
Next ib
Next i
' Clean up
g.Dispose()
'Save the image using the FileManager.
Chart.FileManager.SaveImage(bmp)
End Sub 'Page_Load
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 0 To 0
Dim s As New Series()
s.Name = "Series " +Convert.ToString(a + 1)
Dim b As Integer
For b = 0 To 3
If (True) Then
Dim e As New Element("Element " + Convert.ToString(b+1), myR.Next(50))
e.BubbleSize = myR.Next(50)
s.Elements.Add(e)
End If
Next b
SC.Add(s)
Next a
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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