📄 postrenderdrawing.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>Post Render Drawing Image</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
'dotnetCHARTING.Chart Chart = new dotnetCHARTING.Chart();
Chart.Type = ChartType.Combo 'Horizontal;
Chart.Width = Unit.Parse(600)
Chart.Height = Unit.Parse(350)
Chart.TempDirectory = "temp"
' 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. Or the dataEngine tutorial in the help file.
Dim s As Series = 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)
' After the chart is generated, the element's positions are available.
' Lets iterate the elements we have added and make an array of these positions.
Dim points(s.Elements.Count-1) As PointF
Dim i As Integer
For i = 0 To s.Elements.Count-1
points(i) = s.Elements(i).Point
Next i
' Draw a curve connecting the points.
g.DrawCurve(Pens.Red, points)
' Draw a string on the first element
g.DrawString("First Element", New Font("Arial", 10), Brushes.Black, points(0))
g.Dispose()
'Save the image using the FileManager.
Chart.FileManager.SaveImage(bmp)
End Sub 'Page_Load
Function getRandomData() As Series
Dim myR As New Random()
Dim s As New Series("My Series")
Dim b As Integer
For b = 1 To 4
Dim e As New Element("Element " + b.ToString(), myR.Next(50))
s.Elements.Add(e)
Next b
Return s
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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