Add 4 stock chart support for AddChart function

Author: crush-wu

chart.go

@@ -78,6 +78,8 @@ const (
 	WireframeContour
 	Bubble
 	Bubble3D
+	HighLowCloseChart
+	OpenHighLowCloseChart
 )
 
 // ChartDashType is the type of supported chart dash types.
@@ -755,6 +757,8 @@ func (opts *Chart) parseTitle() {
 //	 52 | WireframeContour            | wireframe contour chart
 //	 53 | Bubble                      | bubble chart
 //	 54 | Bubble3D                    | 3D bubble chart
+//	 55 | HighLowCloseChart           | High-Low-Close stock chart
+//	 56 | OpenHighLowCloseChart       | Open-High-Low-Close stock chart
 //
 // In Excel a chart series is a collection of information that defines which
 // data is plotted such as values, axis labels and formatting.

drawing.go

@@ -159,6 +159,8 @@ func (f *File) addChart(opts *Chart, comboCharts []*Chart) {
 		WireframeContour:            f.drawSurfaceChart,
 		Bubble:                      f.drawBubbleChart,
 		Bubble3D:                    f.drawBubbleChart,
+		HighLowCloseChart:           f.drawStockChart,
+		OpenHighLowCloseChart:       f.drawStockChart,
 	}
 	xlsxChartSpace.Chart.drawChartLegend(opts)
 	xlsxChartSpace.Chart.PlotArea.SpPr = f.drawShapeFill(opts.PlotArea.Fill, xlsxChartSpace.Chart.PlotArea.SpPr)
@@ -689,6 +691,26 @@ func (f *File) drawBubbleChart(pa *cPlotArea, opts *Chart) *cPlotArea {
 	return plotArea
 }
 
+func (f *File) drawStockChart(pa *cPlotArea, opts *Chart) *cPlotArea {
+	plotArea := &cPlotArea{
+		StockChart: []*cCharts{
+			{
+				VaryColors: &attrValBool{
+					Val: opts.VaryColors,
+				},
+				Ser:   f.drawChartSeries(opts),
+				DLbls: f.drawChartDLbls(opts),
+				AxID:  f.genAxID(opts),
+			},
+		},
+		ValAx:  f.drawPlotAreaValAx(pa, opts),
+		DateAx: f.drawPlotAreaCatAx(pa, opts),
+	}
+	ser := *plotArea.StockChart[0].Ser
+	ser[0].Val.NumRef.NumCache = &cNumCache{}
+	return plotArea
+}
+
 // drawChartGapWidth provides a function to draw the c:gapWidth element by given
 // format sets.
 func (f *File) drawChartGapWidth(opts *Chart) *attrValInt {

xmlChart.go

@@ -356,6 +356,7 @@ type cPlotArea struct {
 	DoughnutChart  []*cCharts `xml:"doughnutChart"`
 	LineChart      []*cCharts `xml:"lineChart"`
 	Line3DChart    []*cCharts `xml:"line3DChart"`
+	StockChart     []*cCharts `xml:"stockChart"`
 	PieChart       []*cCharts `xml:"pieChart"`
 	Pie3DChart     []*cCharts `xml:"pie3DChart"`
 	OfPieChart     []*cCharts `xml:"ofPieChart"`
@@ -365,6 +366,7 @@ type cPlotArea struct {
 	SurfaceChart   []*cCharts `xml:"surfaceChart"`
 	CatAx          []*cAxs    `xml:"catAx"`
 	ValAx          []*cAxs    `xml:"valAx"`
+	DateAx         []*cAxs    `xml:"dateAx"`
 	SerAx          []*cAxs    `xml:"serAx"`
 	DTable         *cDTable   `xml:"dTable"`
 	SpPr           *cSpPr     `xml:"spPr"`