📄 postrenderdrawing.aspx
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<%@ Import Namespace="System.Drawing" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Page Language="C#" Debug="true" Description="dotnetCHARTING Component" %>
<HTML>
<HEAD>
<TITLE>Post Render Drawing Image</TITLE>
<script runat="server">
void Page_Load(Object sender,EventArgs e)
{
//dotnetCHARTING.Chart Chart = new dotnetCHARTING.Chart();
Chart.Type = ChartType.Combo;//Horizontal;
Chart.Width = 600;
Chart.Height = 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.
Series s = getRandomData();
// Add the random data.
Chart.SeriesCollection.Add(s);
//Get a bitmap of the chart.
Bitmap bmp = Chart.GetChartBitmap();
// Create a graphics object from the bitmap
Graphics g = 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.
PointF[] points = new PointF[s.Elements.Count];
for(int i = 0; i < s.Elements.Count; i++)
points[i] = s.Elements[i].Point;
// 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);
}
Series getRandomData()
{
Random myR = new Random();
Series s = new Series("My Series");
for(int b = 1; b < 5; b++)
{
Element e = new Element("Element " + b, myR.Next(50));
s.Elements.Add(e);
}
return s;
}
</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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