How To Use the Chart Web Component with Visual Basic

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This article provides an overview of how you can use the Office Chart Web Component on a Visual Basic form to visualize related data. More specifically, the code in this article illustrates by example how to do the following:

  • Use array data for a chart.
  • Use an ADO recordset for chart data.
  • Use spreadsheet data for a chart.
  • Create multiple charts in a single chartspace.
  • Create a combination chart.-and-

  • Format different chart components such as axes, datalabels, series, plotareas and more.

More Information

Steps to Create Sample

  1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.
  2. Click Components on the Project menu. Select Microsoft Office Web Components 9.0 and click OK.
  3. Add the following controls to the form with the properties indicated:

    CommandButtonCommand1Use Arrays
    CommandButtonCommand2Use ADO Recordset
    CommandButtonCommand3Use Spreadsheet

    NOTE: Size the ChartSpace control on your form so that it takes up as much of the form as possible while still allowing for the other controls on the form.
  4. Add the following code to the module of Form1:
    Private Sub Command1_Click()

    'Create arrays for the x-values and the y-values
    Dim xValues As Variant, yValues1 As Variant, yValues2 As Variant
    xValues = Array("Beverages", "Condiments", "Confections", _
    "Dairy Products", "Grains & Cereals", _
    "Meat & Poultry", "Produce", "Seafood")
    yValues1 = Array(104737, 50952, 78128, 117797, 52902, 80160, 47491, _
    yValues2 = Array(20000, 15000, 36000, 56000, 40000, 18000, 20000, _

    'Create a new chart
    Dim oChart As WCChart
    Set oChart = ChartSpace1.Charts.Add

    'Add a title to the chart
    oChart.HasTitle = True
    oChart.Title.Caption = "Sales Per Category"

    'Add a series to the chart with the x-values and y-values
    'from the arrays and set the series type to a column chart
    Dim oSeries As WCSeries
    Set oSeries = oChart.SeriesCollection.Add
    With oSeries
    .Caption = "1995"
    .SetData chDimCategories, chDataLiteral, xValues
    .SetData chDimValues, chDataLiteral, yValues1
    .Type = chChartTypeColumnClustered
    End With

    'Add another series to the chart with the x-values and y-values
    'from the arrays and set the series type to a line chart
    Set oSeries = oChart.SeriesCollection.Add
    With oSeries
    .Caption = "1996"
    .SetData chDimCategories, chDataLiteral, xValues
    .SetData chDimValues, chDataLiteral, yValues2
    .Type = chChartTypeLineMarkers
    End With

    'Add a value axis to the right of the chart for the second series
    oChart.Axes.Add oChart.Axes(chAxisPositionLeft).Scaling, _
    chAxisPositionRight, chValueAxis

    'Format the Value Axes
    oChart.Axes(chAxisPositionLeft).NumberFormat = "$#,##0"
    oChart.Axes(chAxisPositionRight).NumberFormat = "0"
    oChart.Axes(chAxisPositionLeft).MajorUnit = 20000
    oChart.Axes(chAxisPositionRight).MajorUnit = 20000

    'Show the legend at the bottom of the chart
    oChart.HasLegend = True
    oChart.Legend.Position = chLegendPositionBottom

    End Sub

    Private Sub Command2_Click()

    'Set up the DataSourceControl for the Chartspace
    Dim rsd As RecordsetDef
    DataSourceControl1.ConnectionString = _
    "DRIVER={Microsoft Access Driver (*.mdb)}; " & _
    "DBQ=C:\Program Files\Microsoft Visual Studio\VB98\nwind.mdb"
    Set rsd = DataSourceControl1.RecordsetDefs.AddNew( _
    "Select * from [Category Sales for 1995]", 3)
    With ChartSpace1
    .DataSource = DataSourceControl1
    .DataMember = rsd.Name
    End With

    'This Chartspace will contain 2 charts. Make the layout so that the
    'charts are positioned horizontally
    ChartSpace1.ChartLayout = chChartLayoutHorizontal

    'Create a new bar chart from the query
    Dim oBarChart As WCChart
    Set oBarChart = ChartSpace1.Charts.Add
    With oBarChart
    .Type = chChartTypeBarClustered
    .SetData chDimCategories, 0, 0 'Categories are first field
    .SetData chDimValues, 0, 1 'Values are second field

    'Format the value axis for the bar chart so that it
    'shows values in thousands (i.e., 45000 displays as 45) and
    'in increments of 25000. Remove the gridlines
    With .Axes(chAxisPositionBottom)
    .NumberFormat = "0,"
    .MajorUnit = 25000
    .HasMajorGridlines = False
    End With

    'Change the color of the series and the plot area
    .SeriesCollection(0).Interior.Color = RGB(150, 0, 150)
    .PlotArea.Interior.Color = RGB(240, 240, 10)
    End With

    'Create a new exploded pie chart from the query
    Dim oPieChart As WCChart
    Set oPieChart = ChartSpace1.Charts.Add
    With oPieChart
    .Type = chChartTypePie
    .SetData chDimCategories, 0, 0 'Categories are first field
    .SetData chDimValues, 0, 1 'Values are second field
    .SeriesCollection(0).Explosion = 20

    'Add a legend to the bottom of the pie chart
    .HasLegend = True
    .Legend.Position = chLegendPositionBottom

    'Add a title to the chart
    .HasTitle = True
    .Title.Caption = "Sales by Category for 1995"
    .Title.Font.Bold = True
    .Title.Font.Size = 11

    'Make the chart width 50% the size of the bar chart's width
    .WidthRatio = 50

    'Show data labels on the slices as percentages
    With .SeriesCollection(0).DataLabelsCollection.Add
    .HasValue = False
    .HasPercentage = True
    .Font.Size = 8
    .Interior.Color = RGB(255, 255, 255)
    End With

    End With

    End Sub

    Private Sub Command3_Click()

    'Dynamically add a spreadsheet control to the form
    Dim oSheet As Spreadsheet
    Me.Controls.Add "OWC.Spreadsheet", "Sheet"
    Set oSheet = Me!Sheet

    'Fill the Sheet with data
    With oSheet
    .Range("A1:A10").Formula = "=Row()"
    .Range("B1:B10").Formula = "=A1^2"
    .Range("A12").Formula = "=Max(A1:A10)"
    .Range("B12").Formula = "=Max(B1:B10)"
    End With

    'Create an xy-scatter chart using the data in the spreadsheet
    Dim oChart As WCChart
    With ChartSpace1
    .DataSource = oSheet.object
    Set oChart = .Charts.Add
    oChart.Type = chChartTypeScatterSmoothLineMarkers
    oChart.SetData chDimXValues, 0, "a1:a10"
    oChart.SetData chDimYValues, 0, "b1:b10"
    End With

    With oChart
    'Display the Axes Titles and
    'set the major units for the axes
    With .Axes(chAxisPositionBottom)
    .HasTitle = True
    .Title.Caption = "X"
    .Title.Font.Size = 8
    .MajorUnit = 1
    End With
    With .Axes(chAxisPositionLeft)
    .HasTitle = True
    .Title.Caption = "X Squared"
    .Title.Font.Size = 8
    .MajorUnit = 10
    End With

    'Set the maximum and minimum axis values
    .Scalings(chDimXValues).Maximum = oSheet.Range("A12").Value
    .Scalings(chDimXValues).Minimum = 1
    .Scalings(chDimYValues).Maximum = oSheet.Range("B12").Value

    'Change the marker and line styles for the series
    With .SeriesCollection(0)
    .Marker.Style = chMarkerStyleDot
    .Marker.Size = 6
    .Line.Weight = 1
    .Line.Color = RGB(255, 0, 0)
    End With
    End With

    'Remove the spreadsheet
    Me.Controls.Remove "Sheet"

    End Sub
    NOTE: You might need to modify the connection string in the Command2_Click event so that it correctly refers to the path of NWIND.MDB, which is installed to the Visual Basic directory by default:
       DataSourceControl1.ConnectionString = _
    "DRIVER={Microsoft Access Driver (*.mdb)}; " & _
    "DBQ=C:\Program Files\Microsoft Visual Studio\VB98\nwind.mdb"
  5. Click Properties on the Project menu. Select the Make tab, deselect Remove Information about Unused ActiveX Controls and click OK.
  6. Press the F5 key to run the program.
  7. Click the Use Arrays button. A combination chart with two value axes is created. The chart uses data from arrays.
  8. Click the Use ADO Recordset button. Two charts are created in the Chartspace; a bar chart and an exploded pie chart with data labels. The Chartspace uses a DataSourceControl for its data and the DataSourceControl references an Access database through an ADO connection.
  9. Click the Use Spreadsheet button. A scatter chart is created that uses a Spreadsheet control with formulas in the cells as its data. The Spreadsheet control is dynamically added and removed at run time.

Artikelnummer: 235885 – Letzte Überarbeitung: 13.07.2004 – Revision: 1