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Lesson 24 Creating Charts and Graphs


In Excel 2010 VBA, we can write code to create charts and graphs easily based on the data on the spreadsheet. Excel 2010 VBA has made charting engine as part of the Shape object. It is also an object by itself. We can create charts on a sheet of their own or embed them into an existing worksheet. The chart sheet is the Chart object whereas the embedded chart is part of the shape collection for the worksheet.

24.1 Creating a Pie Chart

To create a pie chart in a spreadsheet, first of all, you need to enter a range of data in a spreadsheet. After entering the data, you need to name the range by right-clicking the range and clicking defines name in the pop-up menu. Name the chart MyChart

Now insert a command button and then click it to enter the following code in the Excel VBA 2010 editor

Private Sub CommandButton1_Click()
 ActiveSheet.Shapes.AddChart.Select
 ActiveSheet.Shapes(1).Top = 10
 ActiveSheet.Shapes(1).Left = 10
 ActiveChart.ChartType = xl3DPie
 ActiveChart.PlotArea.Select
 ActiveChart.SetSourceData Source:=Range("MyChart")
 ActiveChart.HasTitle = True
 ActiveChart.ChartTitle.Text = "My Chart"
End Sub
Figure 24.1 The Pie Chart

To separate the pie chart into slices (The technical term is explode), you can add this line to the code:

ActiveChart.SeriesCollection(1).Explosion = 10

As there are five sectors, setting the explosion value to 10 explode all slices. You will get the following chart:

Figure 24.2 The Pie Chart

23.2 Creating a Bar Chart

To draw a bar Chart, you just need to change the ChartType to xl3DColumn.

Private Sub CommandButton2_Click()ActiveSheet.Shapes.AddChart.Select
 ActiveSheet.Shapes(1).Top = 10
 ActiveSheet.Shapes(1).Left = 10
 ActiveChart.ChartType = xl3DColumn
 ActiveChart.PlotArea.Select
 ActiveChart.SetSourceData Source:=Range("MyChart")
 ActiveChart.HasTitle = True
 ActiveChart.ChartTitle.Text = "My Chart"
End Sub
Figure 24.3 The Bar Chart

Excel VBA 2010 has built-in parameters to define the types of charts that can be drawn on a spreadsheet. You can refer to the parameters as the ChartType properties. The list of common properties for ChartType are listed below:

Table 24.1 ChartType Properties
PropertyChart Type
xlAreaArea Chart
 xlBar Bar Chart
 xlColumn Column Chart
 xlLine Line Chart
 xlPie Pie Chart
 xlXYScatter XY Scatter Chart
 xl3DArea 3D Area Chart
 xl3DBar 3D Bar Chart
 xl3DColumn 3D Column Chart
 Xl3DLine 3D Line Chart

For example, if you change the ChartType property to xlLine using the code

ActiveChart.ChartType = xlLine

you will obtain a line graph as follows:

Figure 24.4





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