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Element Coordinates With Images

Demonstrates getting the coordinates of elements after the chart is rendered and doing some drawing before the chart is saved.

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<%@ Page Language="C#" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<script runat="server">

void Page_Load(Object sender,EventArgs e)
{
// Demonstrates getting the coordinates of elements after the chart is rendered and doing some drawing before the chart is saved.
Chart.TempDirectory = "temp";
Chart.Debug = true;

Chart.Type = ChartType.Combo;
Chart.Size = "600x350";
//Chart.Title = ".netCHARTING Sample";
Chart.XAxis.SpacingPercentage = 5;
Chart.LegendBox.Visible = false;

// *DYNAMIC DATA NOTE*
// This sample uses random data to populate the chart. To populate
// a chart with database data see the following resources:
// - Help File > Getting Started > Data Tutorials
// - DataEngine Class in the help file
// - Sample: features/DataEngine.aspx

SeriesCollection mySC = getRandomData();

// Add the random data.
Chart.SeriesCollection.Add(mySC);

// Get a chart bitmap
Bitmap bmp = Chart.GetChartBitmap();
Graphics g = Graphics.FromImage(bmp);

// Draw the element polygons.
using(Pen pen = new Pen(Color.Red,2))
{
foreach(Element el in mySC[0].Elements)
{
GraphicsPath gp = new GraphicsPath();
gp.AddPolygon(el.GetPolygon());
RectangleF r = gp.GetBounds();
Bitmap newBmp = getChart(Size.Round(r.Size));
g.DrawImage(newBmp, Point.Round(r.Location));
}
}
g.Dispose();
Chart.FileManager.SaveImage(bmp);

}

SeriesCollection getRandomData()
{
Random myR = new Random(1);
SeriesCollection SC = new SeriesCollection();
for(int a = 1; a < 5; a++)
{
Series s = new Series("Series " + a.ToString());
for(int b = 1; b < 5; b++)
{
Element e = new Element("Element " + b.ToString());
e.YValue = myR.Next(50);
s.Elements.Add(e);
}
SC.Add(s);
}
return SC;
}

Bitmap getChart(Size size)
{
Chart c = new Chart();
c.Width = size.Width;
c.Height = size.Height;
c.LegendBox.Visible = false;
c.SmallChartMode = true;
c.SeriesCollection.Add(getRandomData()[0]);
return c.GetChartBitmap();
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>.netCHARTING Sample</title></head>
<body>
<div align="center">
<dotnet:Chart id="Chart" runat="server"/>
</div>
</body>
</html>

<%@ Page Language="vb" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<script runat="server">

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Demonstrates getting the coordinates of elements after the chart is rendered and doing some drawing before the chart is saved.
Chart.TempDirectory = "temp"
Chart.Debug = True

Chart.Type = ChartType.Combo
Chart.Size = "600x350"
'Chart.Title = ".netCHARTING Sample";
Chart.XAxis.SpacingPercentage = 5
Chart.LegendBox.Visible = False

' *DYNAMIC DATA NOTE*
' This sample uses random data to populate the chart. To populate
' a chart with database data see the following resources:
' - Help File > Getting Started > Data Tutorials
' - DataEngine Class in the help file
' - Sample: features/DataEngine.aspx

Dim mySC As SeriesCollection = getRandomData()

' Add the random data.
Chart.SeriesCollection.Add(mySC)

' Get a chart bitmap
Dim bmp As Bitmap = Chart.GetChartBitmap()
Dim g As Graphics = Graphics.FromImage(bmp)

' Draw the element polygons.
Using pen As Pen = New Pen(Color.Red,2)
For Each el As Element In mySC(0).Elements
Dim gp As GraphicsPath = New GraphicsPath()
gp.AddPolygon(el.GetPolygon())
Dim r As RectangleF = gp.GetBounds()
Dim newBmp As Bitmap = getChart(Size.Round(r.Size))
g.DrawImage(newBmp, Point.Round(r.Location))
Next el
End Using
g.Dispose()
Chart.FileManager.SaveImage(bmp)

End Sub

Function getRandomData() As SeriesCollection
Dim myR As Random = New Random(1)
Dim SC As SeriesCollection = New SeriesCollection()
For a As Integer = 1 To 4
Dim s As Series = New Series("Series " & a.ToString())
For b As Integer = 1 To 4
Dim e As Element = New Element("Element " & b.ToString())
e.YValue = myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
Return SC
End Function

Function getChart(ByVal size As Size) As Bitmap
Dim c As Chart = New Chart()
c.Width = size.Width
c.Height = size.Height
c.LegendBox.Visible = False
c.SmallChartMode = True
c.SeriesCollection.Add(getRandomData()(0))
Return c.GetChartBitmap()
End Function

</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>.netCHARTING Sample</title></head>
<body>
<div align="center">
<dotnet:Chart id="Chart" runat="server"/>
</div>
</body>
</html>

Sample FilenameElementCoordinatesWithImages.aspx
Version5.0
Uses DatabaseNo

JS Charting

Gallery

Element Coordinates With Images