This closes #1368, fixes number parsing issue, adds support for create a 3D line chart

7 files changed, 74 insertions, 17 deletions

diff --git a/cell_test.go b/cell_test.go
index 0205705..7598058 100644
--- a/cell_test.go
+++ b/cell_test.go
@@ -683,51 +683,48 @@ func TestSetCellRichText(t *testing.T) {
 
 func TestFormattedValue2(t *testing.T) {
 	f := NewFile()
-	v := f.formattedValue(0, "43528", false)
-	assert.Equal(t, "43528", v)
+	assert.Equal(t, "43528", f.formattedValue(0, "43528", false))
 
-	v = f.formattedValue(15, "43528", false)
-	assert.Equal(t, "43528", v)
+	assert.Equal(t, "43528", f.formattedValue(15, "43528", false))
 
-	v = f.formattedValue(1, "43528", false)
-	assert.Equal(t, "43528", v)
+	assert.Equal(t, "43528", f.formattedValue(1, "43528", false))
 	customNumFmt := "[$-409]MM/DD/YYYY"
 	_, err := f.NewStyle(&Style{
 		CustomNumFmt: &customNumFmt,
 	})
 	assert.NoError(t, err)
-	v = f.formattedValue(1, "43528", false)
-	assert.Equal(t, "03/04/2019", v)
+	assert.Equal(t, "03/04/2019", f.formattedValue(1, "43528", false))
 
 	// formatted value with no built-in number format ID
 	numFmtID := 5
 	f.Styles.CellXfs.Xf = append(f.Styles.CellXfs.Xf, xlsxXf{
 		NumFmtID: &numFmtID,
 	})
-	v = f.formattedValue(2, "43528", false)
-	assert.Equal(t, "43528", v)
+	assert.Equal(t, "43528", f.formattedValue(2, "43528", false))
 
 	// formatted value with invalid number format ID
 	f.Styles.CellXfs.Xf = append(f.Styles.CellXfs.Xf, xlsxXf{
 		NumFmtID: nil,
 	})
-	_ = f.formattedValue(3, "43528", false)
+	assert.Equal(t, "43528", f.formattedValue(3, "43528", false))
 
 	// formatted value with empty number format
 	f.Styles.NumFmts = nil
 	f.Styles.CellXfs.Xf = append(f.Styles.CellXfs.Xf, xlsxXf{
 		NumFmtID: &numFmtID,
 	})
-	v = f.formattedValue(1, "43528", false)
-	assert.Equal(t, "43528", v)
+	assert.Equal(t, "43528", f.formattedValue(1, "43528", false))
 
 	// formatted decimal value with build-in number format ID
 	styleID, err := f.NewStyle(&Style{
 		NumFmt: 1,
 	})
 	assert.NoError(t, err)
-	v = f.formattedValue(styleID, "310.56", false)
-	assert.Equal(t, "311", v)
+	assert.Equal(t, "311", f.formattedValue(styleID, "310.56", false))
+
+	for _, fn := range builtInNumFmtFunc {
+		assert.Equal(t, "0_0", fn("0_0", "", false))
+	}
 }
 
 func TestSharedStringsError(t *testing.T) {
diff --git a/chart.go b/chart.go
index 24ad207..0caa505 100644
--- a/chart.go
+++ b/chart.go
@@ -63,6 +63,7 @@ const (
 	Col3DCylinderPercentStacked = "col3DCylinderPercentStacked"
 	Doughnut                    = "doughnut"
 	Line                        = "line"
+	Line3D                      = "line3D"
 	Pie                         = "pie"
 	Pie3D                       = "pie3D"
 	PieOfPieChart               = "pieOfPie"
@@ -122,6 +123,7 @@ var (
 		Col3DCylinderPercentStacked: 15,
 		Doughnut:                    0,
 		Line:                        0,
+		Line3D:                      20,
 		Pie:                         0,
 		Pie3D:                       30,
 		PieOfPieChart:               0,
@@ -176,6 +178,7 @@ var (
 		Col3DCylinderPercentStacked: 20,
 		Doughnut:                    0,
 		Line:                        0,
+		Line3D:                      15,
 		Pie:                         0,
 		Pie3D:                       0,
 		PieOfPieChart:               0,
@@ -194,6 +197,7 @@ var (
 		ColPercentStacked: 100,
 	}
 	chartView3DPerspective = map[string]int{
+		Line3D:           30,
 		Contour:          0,
 		WireframeContour: 0,
 	}
@@ -240,6 +244,7 @@ var (
 		Col3DCylinderPercentStacked: 1,
 		Doughnut:                    0,
 		Line:                        0,
+		Line3D:                      0,
 		Pie:                         0,
 		Pie3D:                       0,
 		PieOfPieChart:               0,
@@ -302,6 +307,7 @@ var (
 		Col3DCylinderPercentStacked: "0%",
 		Doughnut:                    "General",
 		Line:                        "General",
+		Line3D:                      "General",
 		Pie:                         "General",
 		Pie3D:                       "General",
 		PieOfPieChart:               "General",
@@ -358,6 +364,7 @@ var (
 		Col3DCylinderPercentStacked: "between",
 		Doughnut:                    "between",
 		Line:                        "between",
+		Line3D:                      "between",
 		Pie:                         "between",
 		Pie3D:                       "between",
 		PieOfPieChart:               "between",
@@ -413,6 +420,7 @@ var (
 		Col3DCylinderStacked:        "stacked",
 		Col3DCylinderPercentStacked: "percentStacked",
 		Line:                        "standard",
+		Line3D:                      "standard",
 	}
 	plotAreaChartBarDir = map[string]string{
 		Bar:                         "bar",
@@ -450,6 +458,7 @@ var (
 		Col3DCylinderStacked:        "col",
 		Col3DCylinderPercentStacked: "col",
 		Line:                        "standard",
+		Line3D:                      "standard",
 	}
 	orientation = map[bool]string{
 		true:  "maxMin",
@@ -624,6 +633,7 @@ func parseChartOptions(opts string) (*chartOptions, error) {
 //	 col3DCylinderPercentStacked | 3D cylinder percent stacked column chart
 //	 doughnut                    | doughnut chart
 //	 line                        | line chart
+//	 line3D                      | 3D line chart
 //	 pie                         | pie chart
 //	 pie3D                       | 3D pie chart
 //	 pieOfPie                    | pie of pie chart
diff --git a/chart_test.go b/chart_test.go
index bd63376..3c80b39 100644
--- a/chart_test.go
+++ b/chart_test.go
@@ -122,6 +122,7 @@ func TestAddChart(t *testing.T) {
 	assert.NoError(t, f.AddChart("Sheet1", "X16", `{"type":"col3DClustered","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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"bottom","show_legend_key":false},"title":{"name":"3D Clustered Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "P30", `{"type":"col3DStacked","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Stacked Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "X30", `{"type":"col3DPercentStacked","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D 100% Stacked Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
+	assert.NoError(t, f.AddChart("Sheet1", "X45", `{"type":"radar","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"top_right","show_legend_key":false},"title":{"name":"Radar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"span"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "AF1", `{"type":"col3DConeStacked","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Cone Stacked Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "AF16", `{"type":"col3DConeClustered","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Cone Clustered Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "AF30", `{"type":"col3DConePercentStacked","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Cone Percent Stacked Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
@@ -135,7 +136,7 @@ func TestAddChart(t *testing.T) {
 	assert.NoError(t, f.AddChart("Sheet1", "AV30", `{"type":"col3DCylinderPercentStacked","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Cylinder Percent Stacked Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "AV45", `{"type":"col3DCylinder","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Cylinder Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet1", "P45", `{"type":"col3D","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"left","show_legend_key":false},"title":{"name":"3D Column Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
-	assert.NoError(t, f.AddChart("Sheet2", "P1", `{"type":"radar","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"top_right","show_legend_key":false},"title":{"name":"Radar Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"span"}`))
+	assert.NoError(t, f.AddChart("Sheet2", "P1", `{"type":"line3D","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30","marker":{"symbol":"none","size":10}, "line":{"color":"#000000"}},{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37","line":{"width":0.25}}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"top","show_legend_key":false},"title":{"name":"3D Line Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero","x_axis":{"major_grid_lines":true,"minor_grid_lines":true,"tick_label_skip":1},"y_axis":{"major_grid_lines":true,"minor_grid_lines":true,"major_unit":1}}`))
 	assert.NoError(t, f.AddChart("Sheet2", "X1", `{"type":"scatter","series":[{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"bottom","show_legend_key":false},"title":{"name":"Scatter Chart"},"plotarea":{"show_bubble_size":true,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":true,"show_val":true},"show_blanks_as":"zero"}`))
 	assert.NoError(t, f.AddChart("Sheet2", "P16", `{"type":"doughnut","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$A$30:$D$37","values":"Sheet1!$B$30:$B$37"}],"format":{"x_scale":1.0,"y_scale":1.0,"x_offset":15,"y_offset":10,"print_obj":true,"lock_aspect_ratio":false,"locked":false},"legend":{"position":"right","show_legend_key":false},"title":{"name":"Doughnut Chart"},"plotarea":{"show_bubble_size":false,"show_cat_name":false,"show_leader_lines":false,"show_percent":true,"show_series_name":false,"show_val":false},"show_blanks_as":"zero","hole_size":30}`))
 	assert.NoError(t, f.AddChart("Sheet2", "X16", `{"type":"line","series":[{"name":"Sheet1!$A$30","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$30:$D$30","marker":{"symbol":"none","size":10}, "line":{"color":"#000000"}},{"name":"Sheet1!$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$32"},{"name":"Sheet1!$A$33","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$33:$D$33"},{"name":"Sheet1!$A$34","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$34:$D$34"},{"name":"Sheet1!$A$35","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$35:$D$35"},{"name":"Sheet1!$A$36","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$36:$D$36"},{"name":"Sheet1!$A$37","categories":"Sheet1!$B$29:$D$29","values":"Sheet1!$B$37:$D$37","line":{"width":0.25}}],"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":"top","show_legend_key":false},"title":{"name":"Line 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":{"major_grid_lines":true,"minor_grid_lines":true,"tick_label_skip":1},"y_axis":{"major_grid_lines":true,"minor_grid_lines":true,"major_unit":1}}`))
diff --git a/drawing.go b/drawing.go
index 3ef5821..2da2573 100644
--- a/drawing.go
+++ b/drawing.go
@@ -224,8 +224,9 @@ func (f *File) addChart(opts *chartOptions, comboCharts []*chartOptions) {
 		Col3DCylinderPercentStacked: f.drawBaseChart,
 		Doughnut:                    f.drawDoughnutChart,
 		Line:                        f.drawLineChart,
-		Pie3D:                       f.drawPie3DChart,
+		Line3D:                      f.drawLine3DChart,
 		Pie:                         f.drawPieChart,
+		Pie3D:                       f.drawPie3DChart,
 		PieOfPieChart:               f.drawPieOfPieChart,
 		BarOfPieChart:               f.drawBarOfPieChart,
 		Radar:                       f.drawRadarChart,
@@ -553,6 +554,29 @@ func (f *File) drawLineChart(opts *chartOptions) *cPlotArea {
 	}
 }
 
+// drawLine3DChart provides a function to draw the c:plotArea element for line
+// chart by given format sets.
+func (f *File) drawLine3DChart(opts *chartOptions) *cPlotArea {
+	return &cPlotArea{
+		Line3DChart: &cCharts{
+			Grouping: &attrValString{
+				Val: stringPtr(plotAreaChartGrouping[opts.Type]),
+			},
+			VaryColors: &attrValBool{
+				Val: boolPtr(false),
+			},
+			Ser:   f.drawChartSeries(opts),
+			DLbls: f.drawChartDLbls(opts),
+			AxID: []*attrValInt{
+				{Val: intPtr(754001152)},
+				{Val: intPtr(753999904)},
+			},
+		},
+		CatAx: f.drawPlotAreaCatAx(opts),
+		ValAx: f.drawPlotAreaValAx(opts),
+	}
+}
+
 // drawPieChart provides a function to draw the c:plotArea element for pie
 // chart by given format sets.
 func (f *File) drawPieChart(opts *chartOptions) *cPlotArea {
diff --git a/lib.go b/lib.go
index 945c6f0..7f388e0 100644
--- a/lib.go
+++ b/lib.go
@@ -688,6 +688,9 @@ func (f *File) addSheetNameSpace(sheet string, ns xml.Attr) {
 // isNumeric determines whether an expression is a valid numeric type and get
 // the precision for the numeric.
 func isNumeric(s string) (bool, int, float64) {
+	if strings.Contains(s, "_") {
+		return false, 0, 0
+	}
 	var decimal big.Float
 	_, ok := decimal.SetString(s)
 	if !ok {
diff --git a/styles.go b/styles.go
index 6d90a9e..5299fbd 100644
--- a/styles.go
+++ b/styles.go
@@ -873,6 +873,9 @@ var operatorType = map[string]string{
 // format as string type by given built-in number formats code and cell
 // string.
 func formatToInt(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -884,6 +887,9 @@ func formatToInt(v, format string, date1904 bool) string {
 // format as string type by given built-in number formats code and cell
 // string.
 func formatToFloat(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -894,6 +900,9 @@ func formatToFloat(v, format string, date1904 bool) string {
 // formatToA provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
 func formatToA(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -907,6 +916,9 @@ func formatToA(v, format string, date1904 bool) string {
 // formatToB provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
 func formatToB(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -920,6 +932,9 @@ func formatToB(v, format string, date1904 bool) string {
 // formatToC provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
 func formatToC(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -930,6 +945,9 @@ func formatToC(v, format string, date1904 bool) string {
 // formatToD provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
 func formatToD(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -940,6 +958,9 @@ func formatToD(v, format string, date1904 bool) string {
 // formatToE provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
 func formatToE(v, format string, date1904 bool) string {
+	if strings.Contains(v, "_") {
+		return v
+	}
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
diff --git a/xmlChart.go b/xmlChart.go
index 53755f3..9024770 100644
--- a/xmlChart.go
+++ b/xmlChart.go
@@ -309,6 +309,7 @@ type cPlotArea struct {
 	BubbleChart    *cCharts `xml:"bubbleChart"`
 	DoughnutChart  *cCharts `xml:"doughnutChart"`
 	LineChart      *cCharts `xml:"lineChart"`
+	Line3DChart    *cCharts `xml:"line3DChart"`
 	PieChart       *cCharts `xml:"pieChart"`
 	Pie3DChart     *cCharts `xml:"pie3DChart"`
 	OfPieChart     *cCharts `xml:"ofPieChart"`