Fix #411, change font size to float type

styles.go

@@ -1981,7 +1981,7 @@ func (f *File) setFont(formatStyle *formatStyle) *xlsxFont {
 	fnt := xlsxFont{
 		B:      formatStyle.Font.Bold,
 		I:      formatStyle.Font.Italic,
-		Sz:     &attrValInt{Val: formatStyle.Font.Size},
+		Sz:     &attrValFloat{Val: formatStyle.Font.Size},
 		Color:  &xlsxColor{RGB: getPaletteColor(formatStyle.Font.Color)},
 		Name:   &attrValString{Val: formatStyle.Font.Family},
 		Family: &attrValInt{Val: 2},

xmlChart.go

@@ -209,7 +209,7 @@ type aRPr struct {
 	SmtID      uint64      `xml:"smtId,attr,omitempty"`
 	Spc        int         `xml:"spc,attr"`
 	Strike     string      `xml:"strike,attr,omitempty"`
-	Sz         int         `xml:"sz,attr,omitempty"`
+	Sz         float64     `xml:"sz,attr,omitempty"`
 	U          string      `xml:"u,attr,omitempty"`
 	SolidFill  *aSolidFill `xml:"a:solidFill"`
 	Latin      *aLatin     `xml:"a:latin"`

xmlStyles.go

@@ -96,7 +96,7 @@ type xlsxFont struct {
 	Condense bool           `xml:"condense,omitempty"`
 	Extend   bool           `xml:"extend,omitempty"`
 	Color    *xlsxColor     `xml:"color"`
-	Sz       *attrValInt    `xml:"sz"`
+	Sz       *attrValFloat  `xml:"sz"`
 	U        *attrValString `xml:"u"`
 	Scheme   *attrValString `xml:"scheme"`
 }
@@ -319,7 +319,7 @@ type formatFont struct {
 	Italic    bool    `json:"italic"`
 	Underline string  `json:"underline"`
 	Family    string  `json:"family"`
-	Size      int    `json:"size"`
+	Size      float64 `json:"size"`
 	Color     string  `json:"color"`
 }