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Defining a Chart s Labels
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Adding data labels to a chart is easy, as long as the labels are based on the data series values or x-axis values. These options are available using the Chart menu and Chart Options. You can also enter your own text or formula into each label, but this involves a lot of manual work. You would need to add standard labels to the series and then individually select each one and either replace it with your own text or click in the formula bar and enter a formula. To save time and effort, you can write a macro to achieve the same results. Figure 15-4 displays the Garden Product Sales Chart with the Monthly Sales and the top sell ing product. The labels have been defined by formulas linked to row 4 of the worksheet, and as you can see, Fertilizer was the top-selling product in April. The formula in the formula bar points to cell E4.
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Figure 15-4. The labels have been programmed with formulas to point to a cell in the worksheet.
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Part 5: Manipulating Excel Objects
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Microsoft Office Excel 2003 Programming Inside Out For example, set up a line chart similar to Figure 15-4. Add the following macro to add the chart labels that correspond to the top-selling products in row 4:
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Sub AddDataLabels() Dim seSales As Series Dim Pts As Points Dim pt As Point Dim rng As Range Dim i As Integer Set rng = Range( B4:G4 )
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Set seSales = ActiveSheet.ChartObjects(1).Chart.SeriesCollection(1)
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seSales.HasDataLabels = True
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Set Pts = seSales.Points
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For Each pt In Pts
i = i + 1
pt.DataLabel.Text = = & rng.Cells(i).Address(RowAbsolute:=True, _
ColumnAbsolute:=True, ReferenceStyle:=xlR1C1, External:=True) pt.DataLabel.Font.Bold = True pt.DataLabel.Position = xlLabelPositionCenter Next pt End Sub
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The object variable rng is assigned a reference to B4:G4. The seSales series is assigned a refer ence to the first and only series in the embedded chart, and the HasDataLabels property of the series is set to True. The For Each Next loop processes each point in the data series. For each point, the code assigns a formula to the Text property of the point s data label. The formula refers to the worksheet cell as an external reference in the R1C1 format. The data label is also boldfaced, and the label positioned above the data point.
Formatting a Chart
Chart formatting is a broad category. You are able to format the ChartObject itself, as well as all the objects contained within the chart. For example, you may modify the ChartObject Location, such as changing an embedded chart to its own chart sheet. You may also classify modifying the color selection for the data series as chart formatting. There are more than 60 chart properties available; Table 15-3 lists the commonly used Chart property names and the results returned.
Table 15-3.
Chart Properties
Returns
xlChartType Boolean
Name
ChartType HasDataTable
Description
Used to set the chart type or return the current chart type. Used to set whether the associated data table will be displayed on the chart. The default is set to False, so the data table is not included if this property is not set. Used to set whether the legend will be displayed.
HasLegend
Boolean
Part 5: Manipulating Excel Objects
Charts
Table 15-3.
Chart Properties
Returns
Boolean xlRowCol
Name
HasTitle PlotBy
Description
Used to set whether the chart will display a chart title. Used to set whether columns in the original data are used as individual data series (xlColumns) or if the rows in the original data are used as the data series (xlRows).
Table 15-4 lists the commonly used ChartObject property names and their results.
Table 15-4.
ChartObject Properties
Returns
Range Chart Double Double String Boolean Boolean
Name
BottomRightCell Chart Height Left Name PrintObject RoundedCorners
Description
Returns the single cell range located under the lower right corner of the embedded ChartObject.
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Returns the actual chart associated with the ChartObject. Sets the height of the embedded chart. Sets the distance from the left edge of the margin to the left edge of the ChartObject. Sets the name of the ChartObject. Sets whether the embedded object will be printed when the worksheet is printed. Sets whether the embedded chart will have rounded corners. By default, the property is set to False, which displays right-angled corners. Sets whether a shadow will appear around the embedded chart. Sets the distance of the Top edge of the ChartObject to the top of the worksheet. Sets whether the ChartObject is visible. Sets the width of the embedded chart.
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