Support subscripted and superscripted text with new SubWrite method

1 files changed, 33 insertions, 0 deletions

diff --git a/subwrite.go b/subwrite.go
new file mode 100644
index 0000000..dbeee5b
--- /dev/null
+++ b/subwrite.go
@@ -0,0 +1,33 @@
+package gofpdf
+
+// Adapted from http://www.fpdf.org/en/script/script61.php by Wirus and released with the FPDF license.
+
+// SubWrite prints text from the current position in the same way as Write().
+// ht is the line height in the unit of measure specified in New(). str
+// specifies the text to write. subFontSize is the size of the font in points.
+// subOffset is the vertical offset of the text in points; a positive value
+// indicates a superscript, a negative value indicates a subscript. link is the
+// identifier returned by AddLink() or 0 for no internal link. linkStr is a
+// target URL or empty for no external link. A non--zero value for link takes
+// precedence over linkStr.
+func (f *Fpdf) SubWrite(ht float64, str string, subFontSize, subOffset float64, link int, linkStr string) {
+	if f.err != nil {
+		return
+	}
+	// resize font
+	subFontSizeOld := f.fontSizePt
+	f.SetFontSize(subFontSize)
+	// reposition y
+	subOffset = (((subFontSize - subFontSizeOld) / f.k) * 0.3) + (subOffset / f.k)
+	subX := f.x
+	subY := f.y
+	f.SetXY(subX, subY-subOffset)
+	//Output text
+	f.write(ht, str, link, linkStr)
+	// restore y position
+	subX = f.x
+	subY = f.y
+	f.SetXY(subX, subY+subOffset)
+	// restore font size
+	f.SetFontSize(subFontSizeOld)
+}