- Add categories or values on reverse order (orientation of the chart) support, and set auto or fixed maximum, minimum of the axis, relate issue #202;

- go test and godoc has been updated

chart.go

@@ -176,6 +176,18 @@ var (
 		Col3DPercentStacked: "col",
 		Line:                "standard",
 	}
+	orientation = map[bool]string{
+		true:  "maxMin",
+		false: "minMax",
+	}
+	catAxPos = map[bool]string{
+		true:  "t",
+		false: "b",
+	}
+	valAxPos = map[bool]string{
+		true:  "r",
+		false: "l",
+	}
 )
 
 // parseFormatChartSet provides function to parse the format settings of the
@@ -227,7 +239,7 @@ func parseFormatChartSet(formatSet string) *formatChart {
 //        for k, v := range values {
 //            xlsx.SetCellValue("Sheet1", k, v)
 //        }
-//        xlsx.AddChart("Sheet1", "E1", `{"type":"col3DClustered","series":[{"name":"Sheet1!$A$2","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"},{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"bottom","show_legend_key":false},"title":{"name":"Fruit 3D Clustered Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
+//        xlsx.AddChart("Sheet1", "E1", `{"type":"col3DClustered","series":[{"name":"Sheet1!$A$2","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$2:$D$2"},{"name":"Sheet1!$A$3","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$3:$D$3"},{"name":"Sheet1!$A$4","categories":"Sheet1!$B$1:$D$1","values":"Sheet1!$B$4:$D$4"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"bottom","show_legend_key":false},"title":{"name":"Fruit 3D Clustered Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero","x_axis":{"reverse_order":true},"y_axis":{"maximum":7.5,"minimum":0.5}}`)
 //        // Save xlsx file by the given path.
 //        err := xlsx.SaveAs("./Book1.xlsx")
 //        if err != nil {
@@ -329,6 +341,16 @@ func parseFormatChartSet(formatSet string) *formatChart {
 //
 // show_val: Specifies that the value shall be shown in a data label. The show_val property is optional. The default value is false.
 //
+// Set the primary horizontal and vertical axis options by x_axis and y_axis. The properties that can be set are:
+//
+//    reverse_order
+//    maximum
+//    minimum
+//
+// reverse_order: Specifies that the categories or values on reverse order (orientation of the chart). The reverse_order property is optional. The default value is false.
+// maximum: Specifies that the fixed maximum, 0 is auto. The maximum property is optional. The default value is auto.
+// minimum: Specifies that the fixed minimum, 0 is auto. The minimum property is optional. The default value is auto.
+//
 func (f *File) AddChart(sheet, cell, format string) {
 	formatSet := parseFormatChartSet(format)
 	// Read sheet data.
@@ -914,14 +936,24 @@ func (f *File) drawChartSeriesDLbls(formatSet *formatChart) *cDLbls {
 
 // drawPlotAreaCatAx provides function to draw the c:catAx element.
 func (f *File) drawPlotAreaCatAx(formatSet *formatChart) []*cAxs {
+	min := &attrValFloat{Val: formatSet.XAxis.Minimum}
+	max := &attrValFloat{Val: formatSet.XAxis.Maximum}
+	if formatSet.XAxis.Minimum == 0 {
+		min = nil
+	}
+	if formatSet.XAxis.Maximum == 0 {
+		max = nil
+	}
 	return []*cAxs{
 		{
 			AxID: &attrValInt{Val: 754001152},
 			Scaling: &cScaling{
-				Orientation: &attrValString{Val: "minMax"},
+				Orientation: &attrValString{Val: orientation[formatSet.XAxis.ReverseOrder]},
+				Max:         max,
+				Min:         min,
 			},
 			Delete: &attrValBool{Val: false},
-			AxPos:  &attrValString{Val: "b"},
+			AxPos:  &attrValString{Val: catAxPos[formatSet.XAxis.ReverseOrder]},
 			NumFmt: &cNumFmt{
 				FormatCode:   "General",
 				SourceLinked: true,
@@ -943,14 +975,24 @@ func (f *File) drawPlotAreaCatAx(formatSet *formatChart) []*cAxs {
 
 // drawPlotAreaValAx provides function to draw the c:valAx element.
 func (f *File) drawPlotAreaValAx(formatSet *formatChart) []*cAxs {
+	min := &attrValFloat{Val: formatSet.YAxis.Minimum}
+	max := &attrValFloat{Val: formatSet.YAxis.Maximum}
+	if formatSet.YAxis.Minimum == 0 {
+		min = nil
+	}
+	if formatSet.YAxis.Maximum == 0 {
+		max = nil
+	}
 	return []*cAxs{
 		{
 			AxID: &attrValInt{Val: 753999904},
 			Scaling: &cScaling{
-				Orientation: &attrValString{Val: "minMax"},
+				Orientation: &attrValString{Val: orientation[formatSet.YAxis.ReverseOrder]},
+				Max:         max,
+				Min:         min,
 			},
 			Delete: &attrValBool{Val: false},
-			AxPos:  &attrValString{Val: "l"},
+			AxPos:  &attrValString{Val: valAxPos[formatSet.YAxis.ReverseOrder]},
 			NumFmt: &cNumFmt{
 				FormatCode:   chartValAxNumFmtFormatCode[formatSet.Type],
 				SourceLinked: true,

excelize_test.go

@@ -861,8 +861,8 @@ func TestAddChart(t *testing.T) {
 	xlsx.AddChart("Sheet2", "X48", `{"type":"barStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 2D Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
 	xlsx.AddChart("Sheet2", "P64", `{"type":"barPercentStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 2D Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
 	xlsx.AddChart("Sheet2", "X64", `{"type":"bar3DClustered","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 3D Clustered Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
-	xlsx.AddChart("Sheet2", "P80", `{"type":"bar3DStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 3D Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
-	xlsx.AddChart("Sheet2", "X80", `{"type":"bar3DPercentStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 3D 100% Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`)
+	xlsx.AddChart("Sheet2", "P80", `{"type":"bar3DStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 3D Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero","y_axis":{"maximum":7.5,"minimum":0.5}}`)
+	xlsx.AddChart("Sheet2", "X80", `{"type":"bar3DPercentStacked","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30"},{"name":"Sheet1!$A$31","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$31:$D$31"},{"name":"Sheet1!$A$32","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$32:$D$32"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"Fruit 3D 100% Stacked Bar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero","x_axis":{"reverse_order":true,"maximum":0,"minimum":0},"y_axis":{"reverse_order":true,"maximum":0,"minimum":0}}`)
 	// Save xlsx file by the given path.
 	err = xlsx.SaveAs("./test/Book_addchart.xlsx")
 	if err != nil {

xmlChart.go

@@ -345,6 +345,8 @@ type cAxs struct {
 // additional axis settings.
 type cScaling struct {
 	Orientation *attrValString `xml:"c:orientation"`
+	Max         *attrValFloat  `xml:"c:max"`
+	Min         *attrValFloat  `xml:"c:min"`
 }
 
 // cNumFmt (Numbering Format) directly maps the c:numFmt element. This element
@@ -482,16 +484,19 @@ type cPageMargins struct {
 
 // formatChartAxis directly maps the format settings of the chart axis.
 type formatChartAxis struct {
-	Crossing            string `json:"crossing"`
-	MajorTickMark       string `json:"major_tick_mark"`
-	MinorTickMark       string `json:"minor_tick_mark"`
-	MinorUnitType       string `json:"minor_unit_type"`
-	MajorUnit           int    `json:"major_unit"`
-	MajorUnitType       string `json:"major_unit_type"`
-	DisplayUnits        string `json:"display_units"`
-	DisplayUnitsVisible bool   `json:"display_units_visible"`
-	DateAxis            bool   `json:"date_axis"`
-	NumFormat           string `json:"num_format"`
+	Crossing            string  `json:"crossing"`
+	MajorTickMark       string  `json:"major_tick_mark"`
+	MinorTickMark       string  `json:"minor_tick_mark"`
+	MinorUnitType       string  `json:"minor_unit_type"`
+	MajorUnit           int     `json:"major_unit"`
+	MajorUnitType       string  `json:"major_unit_type"`
+	DisplayUnits        string  `json:"display_units"`
+	DisplayUnitsVisible bool    `json:"display_units_visible"`
+	DateAxis            bool    `json:"date_axis"`
+	ReverseOrder        bool    `json:"reverse_order"`
+	Maximum             float64 `json:"maximum"`
+	Minimum             float64 `json:"minimum"`
+	NumFormat           string  `json:"num_format"`
 	NumFont             struct {
 		Color     string `json:"color"`
 		Bold      bool   `json:"bold"`