[US-395] Add example code for multifont encoder

multi-font-encoder/render_multi_language_text.go

@@ -0,0 +1,61 @@
+/*
+ * renders a multi language text using a multi font encoder.
+ *
+ * Run as: go run render_multi_language_text.go
+ */
+package main
+
+import (
+	"os"
+
+	"github.com/unidoc/unipdf/v3/common/license"
+	"github.com/unidoc/unipdf/v3/creator"
+	"github.com/unidoc/unipdf/v3/model"
+)
+
+func init() {
+	// Make sure to load your metered License API key prior to using the library.
+	// If you need a key, you can sign up and create a free one at https://cloud.unidoc.io
+	err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`))
+	if err != nil {
+		panic(err)
+	}
+}
+
+func main() {
+	inputText := "Sample text 示例文本 טקסט לדוגמה ጽሑፍ ኣብነት 샘플 텍스트"
+	fonts := getFonts([]string{
+		"./fonts/PCSB Hebrew Regular.ttf",
+		"./fonts/NotoSerifEthiopic_Condensed-Black.ttf",
+		"./fonts/OpenSans-Regular.ttf",
+		"./fonts/Batang.ttf",
+	})
+
+	c := creator.New()
+	c.SetPageSize(creator.PageSizeA5)
+	p := c.NewStyledParagraph()
+	style := &p.Append(inputText).Style
+	style.MultiFont = model.NewMultipleFontEncoder(fonts)
+
+	err := c.Draw(p)
+	if err != nil {
+		panic(err)
+	}
+	if err := c.WriteToFile("multiple-language-text-multi-font.pdf"); err != nil {
+		panic(err)
+	}
+}
+
+// getFonts returns list of *model.PdfFont from list of paths to fonts files.
+func getFonts(fontPaths []string) []*model.PdfFont {
+	fonts := []*model.PdfFont{}
+	for _, path := range fontPaths {
+		font, err := model.NewCompositePdfFontFromTTFFile(path)
+		if err != nil {
+			panic(err)
+		}
+		fonts = append(fonts, font)
+	}
+
+	return fonts
+}