This closes #2052, support to sets the format of the chart series data label

- Add new field DataLabel in the ChartSeries data type

cell.go

@@ -1214,8 +1214,8 @@ func setRichText(runs []RichTextRun) ([]xlsxR, error) {
 }
 
 // SetCellRichText provides a function to set cell with rich text by given
-// worksheet. For example, set rich text on the A1 cell of the worksheet named
-// Sheet1:
+// worksheet name, cell reference and rich text runs. For example, set rich text
+// on the A1 cell of the worksheet named Sheet1:
 //
 //	package main
 //

chart.go

@@ -748,6 +748,7 @@ func (opts *Chart) parseTitle() {
 //	Fill
 //	Line
 //	Marker
+//	DataLabel
 //	DataLabelPosition
 //
 // Name: Set the name for the series. The name is displayed in the chart legend
@@ -791,6 +792,8 @@ func (opts *Chart) parseTitle() {
 //	x
 //	auto
 //
+// DataLabel: This sets the format of the chart series data label.
+//
 // DataLabelPosition: This sets the position of the chart series data label.
 //
 // Set properties of the chart legend. The options that can be set are:

drawing.go

@@ -1028,6 +1028,10 @@ func (f *File) drawChartSeriesDLbls(i int, opts *Chart) *cDLbls {
 			dLbls.DLblPos = &attrValString{Val: stringPtr(chartDataLabelsPositionTypes[opts.Series[i].DataLabelPosition])}
 		}
 	}
+	dLbl := opts.Series[i].DataLabel
+	dLbls.SpPr = f.drawShapeFill(dLbl.Fill, dLbls.SpPr)
+	dLbls.TxPr = &cTxPr{BodyPr: aBodyPr{}, P: aP{PPr: &aPPr{DefRPr: aRPr{}}}}
+	drawChartFont(&dLbl.Font, &dLbls.TxPr.P.PPr.DefRPr)
 	return dLbls
 }
 

xmlChart.go

@@ -484,6 +484,8 @@ type cNumCache struct {
 // the specific formatting and positioning settings.
 type cDLbls struct {
 	NumFmt          *cNumFmt       `xml:"numFmt"`
+	SpPr            *cSpPr         `xml:"spPr"`
+	TxPr            *cTxPr         `xml:"txPr"`
 	DLblPos         *attrValString `xml:"dLblPos"`
 	ShowLegendKey   *attrValBool   `xml:"showLegendKey"`
 	ShowVal         *attrValBool   `xml:"showVal"`
@@ -610,6 +612,13 @@ type ChartLine struct {
 	Width  float64
 }
 
+// ChartDataLabel directly maps the format settings of the chart labels.
+type ChartDataLabel struct {
+	Alignment Alignment
+	Font      Font
+	Fill      Fill
+}
+
 // ChartSeries directly maps the format settings of the chart series.
 type ChartSeries struct {
 	Name              string
@@ -619,5 +628,6 @@ type ChartSeries struct {
 	Fill              Fill
 	Line              ChartLine
 	Marker            ChartMarker
+	DataLabel         ChartDataLabel
 	DataLabelPosition ChartDataLabelPositionType
 }