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Generating Bar Chart in ASP.NET

, 8 Nov 2004 CPOL
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This article demonstrates how to create chart in ASP.NET using System.Drawing namespace.


The following example demonstrates how to generate bar-charts for any business information available on a web page. This uses the classes which are provided in the .NET System.Drawing namespace to generate the chart.

Bar chart created in the below example illustrates the profit of a company for each month from January through December.

Generating the Bar chart

Data which is to be displayed on X axis and Y axis is stored in ArrayLists, and then the data is read from these ArrayLists for creating the required bar chart.

First, the ArrayLists are populated as follows:

Dim aMonths As ArrayList = New ArrayList()
aProfits As ArrayList = New ArrayList()


Once the data is populated, the chart can be generated by calling the method DrawBarGraph:

DrawBarGraph("Profits!", aMonths, aProfits)

DrawBarGraph is defined as follows:

Sub DrawBarGraph(ByVal strTitle As String, _
        ByVal aX As ArrayList, ByVal aY As ArrayList)
    Const iColWidth As Integer = 60, iColSpace As Integer = 25, _
          iMaxHeight As Integer = 400, iHeightSpace As Integer = 25, _
          iXLegendSpace As Integer = 30, iTitleSpace As Integer = 50
    Dim iMaxWidth As Integer = (iColWidth + iColSpace) * aX.Count + iColSpace, _
          iMaxColHeight As Integer = 0, _
          iTotalHeight As Integer = iMaxHeight + iXLegendSpace + iTitleSpace

    Dim objBitmap As Bitmap = New Bitmap(iMaxWidth, iTotalHeight)
    Dim objGraphics As Graphics = Graphics.FromImage(objBitmap)
    objGraphics.FillRectangle(New SolidBrush(Color.White), _
                0, 0, iMaxWidth, iTotalHeight)
    objGraphics.FillRectangle(New SolidBrush(Color.Ivory), _
                0, 0, iMaxWidth, iMaxHeight)

    ' find the maximum value
    Dim iValue As Integer
    For Each iValue In aY
        If iValue > iMaxColHeight Then iMaxColHeight = iValue

    Dim iBarX As Integer = iColSpace, iCurrentHeight As Integer
    Dim objBrush As SolidBrush = New SolidBrush(Color.FromArgb(70, 20, 20))
    Dim fontLegend As Font = New Font("Arial", 11), _
        fontValues As Font = New Font("Arial", 8), _
        fontTitle As Font = New Font("Arial", 24)

     ' loop through and draw each bar
    Dim iLoop As Integer
    For iLoop = 0 To aX.Count - 1
        iCurrentHeight = ((Convert.ToDouble(aY(iLoop)) / _
               Convert.ToDouble(iMaxColHeight)) * _
               Convert.ToDouble(iMaxHeight - iHeightSpace))
        objGraphics.FillRectangle(objBrush, iBarX, _
        iMaxHeight - iCurrentHeight, iColWidth, iCurrentHeight)
        objGraphics.DrawString(aX(iLoop), fontLegend, _
           objBrush, iBarX, iMaxHeight)
        objGraphics.DrawString(Format(aY(iLoop), "#,###"), _
           fontValues, objBrush, iBarX, iMaxHeight - iCurrentHeight - 15)
        iBarX += (iColSpace + iColWidth)
    objGraphics.DrawString(strTitle, fontTitle, objBrush, _
          (iMaxWidth / 2) - strTitle.Length * 6, iMaxHeight + iXLegendSpace)
    'objBitmap.Save("C:\inetpub\wwwroot\graph.gif", ImageFormat.GIF) 

    objBitmap.Save(Response.OutputStream, ImageFormat.Gif)
End Sub

This code will generate the bar chart and display it on the screen. Also, if required, the bar chart can be saved as an image, just uncomment the line below in the above code:

objBitmap.Save("C:\inetpub\wwwroot\graph.gif", ImageFormat.GIF)


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

J A Srikanth
Web Developer
United States United States
No Biography provided

Comments and Discussions

QuestionIt works fine. Pinmemberarun733111-Nov-11 1:14 
GeneralMy vote of 1 PinmemberG.santosh priya13-Oct-11 22:56 
Generalchart not displayed in firefox PinmemberRajaprathapdhana7-Mar-09 0:15 
QuestionNot applying for the masterpage PinmemberMember 51870134-Mar-09 1:33 
GeneralDoesnt work Pinmemberbone krusher31-Jan-09 15:33 
GeneralNo Workie! PinmemberCrazyTasty27-Feb-08 22:25 
GeneralProblem with code PinmemberMember 412528024-Feb-08 12:50 
General3D in bar charts PinmemberHasanNazeer16-Jan-08 4:13 
GeneralRe: 3D in bar charts Pinmembersidbaruah28-Apr-08 23:21 
Generalerror when compiling with visual studio 2005 PinmemberMeali00728-Nov-07 11:42 
QuestionOther Controls on the Page? PinmemberJohn Tyce5-Oct-07 5:30 
GeneralCentering the labels Pinmembertmmy_cat28-Aug-07 12:05 
QuestionBind the array to a datasource? Pinmemberajwelch10-Apr-07 23:41 
GeneralThis code in C# Pinmemberlauradonaghy20-Mar-07 5:39 
GeneralRe: This code in C# Pinmembermalinwick19-Jul-07 4:28 
GeneralRe: This code in C# Pinmembermalinwick19-Jul-07 5:59 
Generaldoes not work in Firefox Pinmemberwebber1234569-Mar-06 6:48 
GeneralRe: does not work in Firefox PinmemberJinx10118-Oct-06 11:24 
GeneralRe: does not work in Firefox Pinmembertmmy_cat28-Aug-07 11:15 
GeneralCode Doesn't Work Pinmembersap_03215-Apr-05 11:02 
GeneralThanks! PinmemberFrank Sandersen26-Nov-04 13:28 
Generalexample image PinmemberTsjaar9-Nov-04 22:15 

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