draw2dpdf/fileutil.go
func SaveToPdfFile(filePath string, pdf *gofpdf.Fpdf) error {
	return pdf.OutputFileAndClose(filePath)
}
func SaveToPdfFile(filePath string, pdf *gofpdf.Fpdf) error {
	return pdf.OutputFileAndClose(filePath)
}
// SaveToPdfFile creates and saves a pdf document to a file